Borough Guides
Sutton Extension Data 2026: Costs, Prices & Constraints
Sutton extension data: median terraced £475k, 15 conservation areas, outer London build cost £2,928/m². 7,545 transactions analysed.
12 min read
Planning guides & data
159 evidence-led articles on planning permission, permitted development, extension costs and London borough rules - built from 9 million UK planning decisions.
159 of 159 articles
Latest · Planning & Permitted Development
How the Mayfair Studio Planning Checker Works (2026): What 90 Seconds of Analysis Actually Includes
Full breakdown of what the free Mayfair Studio planning checker analyses: 10 national datasets, 32 London borough policies, 9m+ planning decisions, PD rights, Article 4, conservation areas, flood risk and more.
· 8 min read
Borough Guides
Redbridge Extension Data 2026: Costs, Prices & Constraints
Redbridge extension data: median terraced £525k, 19 conservation areas, outer London build cost £2,928/m². 7,522 transactions analysed.
12 min read
Borough Guides
Kingston Extension Data 2026: Costs, Prices & Constraints
Kingston upon Thames extension data: median terraced £560k, 28 conservation areas, outer London build cost £2,928/m². 6,467 transactions analysed.
12 min read
Borough Guides
Hounslow Extension Data 2026: Costs, Prices & Constraints
Hounslow extension data: median terraced £518k, 27 conservation areas, outer London build cost £2,928/m². 7,252 transactions analysed.
12 min read
Borough Guides
Hillingdon Extension Data 2026: Costs, Prices & Constraints
Hillingdon extension data: median terraced £480k, 34 conservation areas, 150 Article 4 directions, outer London build cost £2,928/m².
12 min read
Borough Guides
Havering Extension Data 2026: Costs, Prices & Constraints
Havering extension data: median terraced £425k, just 11 conservation areas, outer London build cost £2,928/m². One of the easiest boroughs for planning.
12 min read
Borough Guides
Harrow Extension Data 2026: Costs, Prices & Constraints
Harrow extension data: median terraced £535k, 27 conservation areas, outer London build cost £2,928/m². 6,367 transactions analysed.
12 min read
Borough Guides
Hammersmith & Fulham Extension Data 2026: Costs & Constraints
Hammersmith & Fulham extension data: median terraced £1.4M, 47 conservation areas, inner London build cost £3,000/m². 7,616 transactions analysed.
12 min read
Borough Guides
Croydon Extension Data 2026: Costs, Prices & Constraints
Croydon extension data: median terraced £425k, 20 conservation areas, outer London build cost £2,928/m². 13,483 transactions analysed.
12 min read
Planning & Permitted Development
Maximum Extension Size Without Planning Permission in London (2026)
Exact PD size limits for every extension type - rear extensions, lofts, side extensions. Plus the Prior Approval scheme that allows 6m or 8m rear extensions without a planning application.
6 min read
Planning & Permitted Development
Do I Need Planning Permission for My Extension in London? (2026)
Decision framework for London homeowners. PD rules by extension type, conservation areas, Article 4 directions, and free instant check tool.
7 min read
Costs & Finance
Extension Costs by London Borough 2026: Where Is It Cheapest to Build?
Compare extension costs across 15 London boroughs. Cost per m², conservation area risk, Article 4 zones, and planning approval rates - from £1,900/m² (Lewisham) to £3,800/m² (Kensington & Chelsea).
12 min read
Costs & Finance
Loft Conversion vs Rear Extension London (2026): Costs, Planning & Which to Choose
Loft conversion or rear extension? Full comparison: costs (£54k–£75k vs £40k–£65k), PD eligibility, value added, build times, and which suits your property.
10 min read
Costs & Finance
Resi vs Mayfair Studio: Which Online Architect for London Extensions? (2026)
Honest comparison of Resi and Mayfair Studio for London home extensions. Prices from £1,295 vs £1,500+, what's included, turnaround times, and which suits your project.
8 min read
Borough Guides
City of London Extension Data 2026: Costs & Constraints
City of London extension data: 95% leasehold, 636 listed buildings, 28 conservation areas, inner London build cost £3,000/m². Unique residential market.
12 min read
Borough Guides
Bromley Extension Data 2026: Costs, Prices & Constraints
Bromley extension data: median terraced £500k, 69 conservation areas, outer London build cost £2,928/m². 13,235 transactions analysed.
12 min read
Borough Guides
Bexley Extension Data 2026: Costs, Prices & Constraints
Bexley extension data: median terraced £405k, 31 conservation areas, outer London build cost £2,928/m². 8,838 Land Registry transactions analysed.
12 min read
Data & Research
London Borough Extension Report 2026: All 33 Ranked
Every London borough ranked for home extensions. Real data from 299k Land Registry sales, EPC records, 17 planning constraint datasets, and an 11-region cost model.
25 min read
Data & Research
Which London Boroughs Are Hardest for Planning Permission? (2026 Data)
London boroughs ranked by planning difficulty using real constraint data. Waltham Forest has 807 Article 4 areas, Richmond 87 conservation areas.
8 min read
Planning
How to Get Planning Permission for a Home Extension in London (2026 Step-by-Step Guide)
Complete 7-step guide to planning permission for London extensions. Council fee £258, 8-week decision period, timeline table, common refusal reasons, and total cost breakdown.
12 min read
Costs & Finance
How Much Do Architectural Drawings Cost in London? (2026)
Planning drawings £1,295–£3,000, building regs £1,500–£4,000, structural engineering £600–£1,500. Cost breakdown by drawing type, factors affecting price, and fixed fee vs hourly comparison.
10 min read
Planning
Do I Need an Architect for a Home Extension in London?
No legal requirement - but here is the practical case. When professional drawings are essential, what happens when homeowners skip them, and how fixed-fee services from £1,295 cover everything you need.
9 min read
Costs & Finance
Fixed-Fee Architects in London: What You Get & What It Costs (2026)
Fixed-fee architect costs in London 2026. Price tiers from £1,295, what each tier includes, and how fixed fees compare to hourly (£80–200/hr) and percentage-based (8–15%) charging.
10 min read
Finding an Architect
Best Architects for Home Extensions in London (2026 Guide)
Ranked guide to the best architects for London home extensions. Mayfair Studio fixed fees from £1,295 vs local RIBA practices (8–15%), Resi, and freelance technicians - with comparison table.
12 min read
Data & Research
Complete List of Article 4 Directions in London (2026 Data)
Every London borough's Article 4 directions counted from planning.data.gov.uk. Waltham Forest leads with 807, Southwark has 480.
10 min read
Data & Research
296 Council Policies That Affect Your Extension
Council-by-council reference for extension policies across England. 296 councils analysed with portal types, SPD coverage, and planning policy URLs.
20 min read
Data & Research
Kitchen Extension Cost Breakdown: London Data (2026)
Kitchen extension costs from DesignForMe survey: 10sqm UK avg £86.5k, London £109k. Build cost, kitchen fit-out, and trade rate breakdown.
10 min read
Data & Research
Energy Ratings Ranked by London Borough (2026 EPC Data)
EPC energy ratings across London boroughs from DLUHC data. How extensions can improve your rating with Part L 2021 requirements.
8 min read
Data & Research
Terraced House Extensions: National Data & Costs (2026)
Terraced house extension data from Land Registry. Prices by region, most common extension types, party wall costs, and PD rules for terraces.
9 min read
Data & Research
Flood Risk and Extensions: London Data by Borough (2026)
How flood risk affects extension planning permission. Flood zone data by London borough, extra costs for flood-resilient construction.
7 min read
Data & Research
How Much Does a Loft Conversion Cost? Real Survey Data (2026)
Loft conversion costs from DesignForMe 2025 survey: UK avg £74k, London £88k. Dormer, hip-to-gable, mansard, and Velux costs compared.
10 min read
Data & Research
Is My House in a Conservation Area? How to Check (2026)
How to check if your house is in a conservation area and what it means for your extension. London boroughs ranked by conservation area count.
7 min read
Data & Research
Average House Size in Every London Borough (2026 EPC Data)
Average floor area by property type across all 33 London boroughs from EPC data. Why floor area matters for extension potential.
8 min read
Data & Research
Solid vs Cavity Walls: Extension Cost Implications (2026)
Solid wall homes (pre-1920s) cost 10-20% more to extend. EPC data on wall type distribution and what it means for your extension budget.
7 min read
Data & Research
How Long Does Planning Permission Take? (100k+ Applications)
Planning application timelines from real data. Statutory 8-week target vs reality. Variation by application type and borough.
8 min read
Data & Research
Victorian vs 1930s vs Post-War: Extension Costs by House Age (2026)
How house age affects extension cost. Victorian solid walls add 10-20%, 1930s semis are most straightforward, post-war homes may have asbestos.
9 min read
Data & Research
Listed Buildings by Area: England's Complete Data (2026)
Listed buildings counted from planning.data.gov.uk. Westminster leads with 3,455. What listing means for extensions and how to get listed building consent.
8 min read
Data & Research
What Your House Tells Us: Energy, Size & Extension Potential
EPC data aggregated nationally by property era. Victorian, 1930s, post-war property profiles with floor areas, wall types, energy ratings, and extension potential.
18 min read
Data & Research
Do Extensions Add Value? Land Registry Data Says...
Extension ROI analysis using Land Registry data. 10-20% value uplift is typical. By region: London extensions add the most absolute value.
15 min read
Data & Research
Extension Costs by Trade: Every Trade Rate in 2026
Daily trade rates for all 11 trades: builder £200-440/day, electrician £250-550, plumber £250-500. London vs Midlands from ConcreteMath 2024/25 data.
15 min read
Borough Guides
Richmond Extensions 2026: Planning & Costs
Home extensions in Richmond upon Thames 2026: conservation areas in Kew, Twickenham and Ham, Article 4 directions, Green Belt limits, and 2026 costs.
7 min read
Borough Guides
Merton Extensions 2026: Planning & Costs
Home extensions in Merton 2026: planning rules, Wimbledon and Mitcham conservation areas, Article 4 directions, and costs for SW19, SW20, CR4, SM4.
7 min read
Borough Guides
Lewisham Extensions 2026: Planning & Costs
Extending in Lewisham 2026: permitted development, Brockley and Blackheath conservation areas, Article 4 directions, planning tips, and 2026 costs inc VAT.
7 min read
Borough Guides
Haringey Extensions 2026: Planning & Costs
Home extensions in Haringey 2026: planning rules, conservation areas in Crouch End, Muswell Hill and Highgate, Article 4 directions, and 2026 costs.
7 min read
Borough Guides
Ealing Home Extension Guide 2026
Extending in Ealing 2026: SPD 4 design rules, Brentham Garden Estate Article 4 direction, conservation areas, planning tips, and typical 2026 costs inc VAT.
7 min read
Borough Guides
Brent Extension Guide 2026: Costs & Rules
Guide to home extensions in Brent 2026. Covers the new January 2025 SPD, conservation areas, Article 4 directions, Mapesbury Estate rules, and typical costs.
7 min read
Extensions
Solar Panels on Extensions London 2026
Solar panels on extensions London 2026: Part 14 Class A planning rules, costs from £1,400/kWp, SEG payments, battery storage, and typical payback periods.
7 min read
Planning
CDM Regulations: London Home Extensions
CDM Regulations 2015 for London home extensions: when they apply, domestic client duties, duty holders, HSE F10 notification, and the Health and Safety file.
7 min read
Planning
Planning Refused: London Extensions Guide
Around 30% of householder planning applications in London are refused. Here are the 10 most common reasons - and how to avoid each one before you submit.
7 min read
Planning
Building Control London Extensions 2026
Building control for London extensions 2026: full plans vs building notice, inspection stages, completion certificates, LABC vs approved inspectors, and fees.
7 min read
Costs & Finance
Home Extension Insurance London Guide
Home extension insurance London: notify your insurer, arrange site cover, and get a structural warranty. What each policy covers and when you need it.
7 min read
Costs & Finance
Council Tax & Home Extensions London
Does a home extension raise council tax in London? Usually not while you live there - here is what triggers a VOA reassessment and how to respond if it does.
7 min read
Conversions
Granny Annexe London 2026: Costs & Rules
Granny annexe London 2026: planning rules, garage conversion £25k–£50k, extension annexe £60k–£120k inc VAT, CIL exemption, and council tax discount explained.
7 min read
Extensions
Modular Extensions London 2026: SIPs Guide
Modular extensions London 2026: SIPs, timber frame, steel frame and volumetric pods. Costs vs traditional build, planning rules, building regs, and mortgages.
7 min read
Extensions
Dormer Extension London 2026: Costs & Rules
Dormer extension London 2026: flat roof, shed, hip-to-gable and L-shaped dormers. Costs, Class B permitted development rules, and party wall guidance.
7 min read
Extensions
1930s Semi Extension London 2026: Guide
1930s semi extension London 2026: rear £55k–£120k, side £45k–£85k, hip-to-gable £55k–£90k, wrap-around £80k–£150k inc VAT. Planning and structure guide.
7 min read
Data & Research
London vs Rest of England: The Extension Cost Premium (2026)
London extension premium quantified: kitchen extensions cost 2.06x non-London, rear extensions 1.94x. Regional multipliers from Inner London 1.25 to North East 0.90.
8 min read
Data & Research
Property Value Trends 1995-2026: 31M Transactions Analysed
UK property price trends from 31M Land Registry transactions. London vs rest of England premium, price by property type, and what it means for extensions.
10 min read
Borough Guides
Barnet Extension Guide 2026: Costs & Rules
Extending in Barnet in 2026? Covers permitted development, Hampstead Garden Suburb restrictions, conservation areas, Article 4 directions, and typical costs.
7 min read
Extensions
Heat Pumps & Extensions London 2026
Heat pump during a London extension 2026: costs inc VAT, the £7,500 Boiler Upgrade Scheme grant, underfloor heating, running cost vs gas, and planning rules.
7 min read
Planning
Future Homes Standard 2026 Extensions
Future Homes Standard and London extensions 2026: Part L U-values (walls 0.18, roof 0.15), heat pumps, triple glazing, MVHR, solar PV, and 0% VAT on upgrades.
7 min read
Planning
45-Degree Rule: London Extensions Guide
45-degree rule for London extensions: how it is measured, which boroughs apply it, and what to do if your design fails the test. 25-degree rule also covered.
7 min read
Planning
4-Year Rule Dead: 10-Year Enforcement 2026
The 4-year rule is replaced by a 10-year enforcement period from April 2024. What this means for London homeowners, mortgages, and certificates of lawful use.
7 min read
Planning
Lawful Development Certificate London 2026
Lawful development certificate London: £206 application fee, £700–£2,000 all-in. When you need CLOPUD vs CLEUD and how to build a strong 8-week case.
7 min read
Planning
Permitted Development Changes 2026
PD changes 2026: larger rear extensions without planning permission, simplified loft conversion rules, curtilage changes. What London homeowners should do now.
7 min read
Costs & Finance
Kitchen Extension Cost London 2026: Prices
Kitchen extension costs London 2026: small 15m² from £60k, medium 20m² from £85k, large 30m² from £120k inc VAT. Build cost vs kitchen fit-out by spec level.
7 min read
Costs & Finance
Extension Cost by Size London 2026
London extension costs by size 2026: 3m×6m is £72k–£110k, 4m×6m is £98k–£142k, all inc VAT. Covers architect, engineer, building regs and contingency.
7 min read
Extensions
Garden Room vs Extension London 2026
Garden room vs extension London 2026: garden rooms £15k–£40k, extensions £50k–£120k+. Planning rules, value added, build time, and which option suits your plot.
7 min read
Extensions
3m Kitchen Extension London 2026: Guide
3m kitchen extension London 2026: costs £50k–£108k inc VAT depending on width. No planning application under permitted development. Layouts and design tips.
7 min read
Extensions
Extension Above a Garage London 2026
Extension above a garage London 2026: integral £25k–£45k, new storey above integral £55k–£90k, above detached £65k–£110k inc VAT. Planning and structure guide.
7 min read
Extensions
Upward Extensions London 2026: Add a Storey
Add a storey to your London home 2026: Class AA and AB permitted development, prior approval, costs £120k–£200k+ inc VAT, and structural challenges.
7 min read
Extensions
Flat Extension London 2026: Leasehold Guide
Flat extension London 2026: costs £55k–£130k inc VAT. No permitted development for flats - planning permission always required. Leasehold consent explained.
7 min read
Conversions
Mansard Loft Conversion London 2026: Costs
Mansard loft conversion London 2026: basic £65k–£95k, mid-range £90k–£130k, high-spec £130k–£180k inc VAT. Planning, party wall, and space vs rear dormer.
7 min read
Extensions
Detached House Extension London 2026
Detached house extension London 2026: rear £82k–£118k, two-storey £140k–£220k, wrap-around £110k–£170k inc VAT. 8m PD rules and design guide.
7 min read
Extensions
Victorian House Extension London 2026
Victorian house extension costs London 2026: side return £40k–£75k, rear £55k–£120k, wrap-around £80k–£150k, loft £55k–£120k. Conservation areas covered.
7 min read
Data & Research
The Planning Constraint Map of England: 17 Datasets Analysed
17 constraint datasets analysed from planning.data.gov.uk. Conservation areas, listed buildings, Article 4 directions, TPOs, flood zones ranked by LPA.
18 min read
Data & Research
How Much Does an Extension Really Cost? Data from 31M Transactions
Extension costs across 11 regions from real data. Regional multipliers, DesignForMe survey data from 1,500+ projects, and trade rates by region.
20 min read
Extensions
Rear Extension London 2026: Costs, Sizes & Planning Guide
Rear extension costs London 2026 inc VAT: 3m×5m £62k–£90k, 4m×5m £82k–£118k, 5m×6m £122k–£178k. Permitted development rules, prior approval scheme, design decisions and timeline.
10 min read
Conversions
Loft Conversion London 2026: Costs, Types & Planning Guide
Loft conversion costs London 2026 inc VAT: Velux £50k–£65k, Dormer £60k–£80k, Mansard £80k–£120k. Planning rules, building regulations, party wall requirements and full timeline.
10 min read
Extensions
Single vs Double Storey Extension London 2026: Which Is Better?
Single storey costs £45k–£165k inc VAT, often no planning needed. Two storey costs 50–70% more but doubles your floor area. Full cost, planning, and value comparison for 2026.
9 min read
Conversions
Garage Conversion London 2026: Costs, Planning & Complete Guide
Garage conversion costs London 2026 inc VAT: basic £18k–£30k, bedroom with en-suite £32k–£50k, full annex £40k–£70k. Planning rules, building regulations, and what use gives the best return.
9 min read
Extensions
Basement Extension London 2026: Costs, Planning & Construction Guide
Basement extension costs London 2026 inc VAT: new basement £130k–£700k+, cellar conversion £30k–£90k. Borough planning policies, underpinning methods, waterproofing types and full 14–22 month timeline.
10 min read
Sustainability
Energy Efficient Extensions London 2026: Part L, Insulation & Heat Pumps
Part L 2021 U-values for extensions: walls 0.18 W/m²K, roof 0.15 W/m²K. Part O overheating rules, £7,500 heat pump grant, underfloor heating costs, solar PV payback and EPC improvement guide.
10 min read
Planning
Party Wall Agreement London 2026: Costs, Process & Surveyor Fees
Complete guide to party wall agreements in London 2026. Surveyor fees £750–£1,800 per neighbour (you pay both). Process takes 2–4 months. Required for ~95% of London extensions.
9 min read
Extensions
Two Storey Extension London 2026: Costs, Planning & Design Guide
Complete guide to two storey extensions in London 2026. Costs £72k-£220k inc VAT. Planning permission almost always required. Cheaper per m² than single storey. 14-20 months from start to finish.
10 min read
Finding an Architect
Architect Fees London 2026: What You'll Actually Pay
London architect fees 2026: 8–15% of build cost or £3k–£15k fixed. RIBA stage breakdown, what drives pricing, red flags to avoid, and how to compare quotes.
7 min read
Borough Guides
Kensington & Chelsea Extension Guide 2026
Extending in Kensington & Chelsea (RBKC)? 73% conservation coverage, strict basement rules, costs 20–30% above London average. Expert planning and design guide.
7 min read
Design
Underfloor Heating Extensions London 2026
Underfloor heating for London extensions 2026: wet vs electric UFH from £25/m², Part L building regs compliance, best flooring choices, and installation advice.
7 min read
Design
London Stock Brick Matching for Extensions
How to match London stock bricks for extensions. New vs reclaimed, mortar matching, conservation area requirements, and sourcing guide. Updated 2026.
7 min read
Design
Kitchen-Diner Extension Layouts London
Six proven kitchen-diner extension layouts for London homes. Galley, L-shaped, island, linear, U-shaped, and broken-plan designs with costs and minimum sizes.
7 min read
Design
Roof Lantern vs Skylight for Extensions
Skylights from £500 or roof lanterns from £2,500? Compare light performance, thermal efficiency, planning rules, and design impact for your London extension.
7 min read
Design
Bifold vs Sliding Doors for Extensions 2026
Bifold doors £3k-8k vs sliding doors £4k-12k for extensions. Bifolds open 90%+, sliding offer slim sightlines and better thermals. Full London comparison guide.
7 min read
Planning
Right to Light London 2026: Rules & Costs
Right to light can stop your extension even with planning permission. 45-degree rule explained, BRE daylight assessment from £800, how to resolve neighbour disputes.
7 min read
Planning
Build Over Agreement London: Thames Water
Building within 3m of a public sewer? Thames Water build over approval takes 6–12 weeks and costs £300–£1,000. Step-by-step guide for London extension owners.
7 min read
Extensions
Porch Extension London 2026: Costs & Guide
Complete guide to porch extensions in London. Costs from £2,000, permitted development rules, design options for Victorian and modern homes. Updated 2026.
7 min read
Borough Guides
Lambeth Extension Rules 2026: Costs & Guide
Complete guide to home extensions in Lambeth. Planning rules, basement SPD, conservation areas, design guidance, and typical costs. Updated 2026.
7 min read
Planning
Prior Approval London 2026: How to Apply
Complete guide to prior approval in London. Larger home extensions, office to residential conversions, and other developments that need council notification.
7 min read
Planning
Building Regulations for Extensions 2026
Complete guide to building regs for extensions. Structural, fire safety, insulation, ventilation requirements. Costs and inspection stages.
8 min read
Planning
Permitted Development Rights London 2026: Complete Guide
Everything you need to know about building without planning permission in London. Borough-specific rules, Article 4 directions, and instant permitted development checker.
6 min read
Borough Guides
Wandsworth Extension Planning 2026
Wandsworth extension guide 2026: permitted development rules, basement policy, conservation areas, and typical costs for rear and side return extensions.
7 min read
Borough Guides
Hackney Extension Guide 2026: Costs & Rules
Complete guide to home extensions in Hackney. New SPD guidance, planning permission, conservation areas, basement policy, and typical costs. Updated 2026.
7 min read
Borough Guides
Camden Extension Guide 2026: Costs & Rules
Camden extension guide 2026: planning rules, permitted development, Article 4 directions, conservation areas, basement policy, and costs. Updated Feb 2026.
7 min read
Costs & Finance
Home Extension Challenges London 2026
Builder shortages, rising material costs, planning delays and Part L changes - the key challenges facing London homeowners extending their properties in 2026.
7 min read
Costs & Finance
Extension ROI London 2026: Value Added
Will your extension pay for itself? Complete ROI analysis for London extensions. Find out which projects add 15-25% value vs which lose money.
7 min read
Costs & Finance
Extension Financing London 2026
Finance a London extension in 2026: remortgage, further advance, or home improvement loan compared. Options for £50k–£150k projects with staged payments.
7 min read
Costs
London Extension Costs 2026: Complete Pricing Guide
Updated 2026 extension costs from real London projects. £3,200-£4,600 per m², single-storey £60k-135k, two-storey £110k-290k. Borough breakdowns and cost calculator.
12 min read
Planning
Southwark Extension Guide: Planning, Costs & Conservation Areas 2025
48 conservation areas in Southwark. Side return £80k-120k, rear £70k-105k. Dulwich, Peckham, Camberwell planning. Victorian terraced costs.
11 min read
Planning
Greenwich Extension Guide: Planning, Costs & World Heritage Site 2025
Maritime Greenwich World Heritage Site restrictions. 20 conservation areas. Side return £55k-90k, rear £65k-95k. Victorian/Edwardian terraced costs.
10 min read
Planning
Islington Extension Guide: Planning, Costs & Rules 2025
40/42 conservation areas restrict permitted development. Side return £50k-110k, rear £60k-90k. Article 4 directions extensive. Typical terraced house extension costs.
11 min read
Borough Guides
Wandsworth Extension Planning 2025
Wandsworth extension guide 2025: permitted development rules, basement policy, conservation areas, and typical costs for rear and side return extensions.
7 min read
Planning
Asbestos in London Extensions: Survey, Removal & Costs 2025
Pre-2000 houses 80% likely to contain asbestos. Survey £250-500, removal £1,500-3,500. Artex, floor tiles, roof sheets. HSE licensed contractor requirements.
10 min read
Extensions
Flat Roof vs Pitched Roof Extension London 2025
Flat roof £52k vs pitched £60k for 30m² extension. Flat: cheaper, easier permitted development, 20-year lifespan. Pitched: 50-90 years, less maintenance, better resale.
9 min read
Planning
Extension Rejected? Planning Appeals Guide London 2025
34% success rate for householder appeals (2025 data). Written representation vs hearing costs, 10-16 week timelines, when to appeal. Real London examples.
9 min read
Extensions
Narrow Garden Extension London: Solutions for Small Gardens
Narrow garden extension solutions: 3-6m depth options, vertical design, minimal garden loss. 10-15m² extensions £35k-£60k.
9 min read
Extensions
Orangery vs Extension London: Which Is Right for You?
Orangery vs extension comparison. Orangeries £30k-£80k (more light, £500-1000/m² cheaper), extensions £50k-£120k (better insulation). Planning permission, costs, ROI.
9 min read
Extensions
Wrap-Around Extension London: Complete Guide to L-Shaped Extensions
Wrap-around extensions combine side return + rear extension for maximum space. £75k-145k cost, planning permission needed, ideal for terraced houses.
10 min read
Planning
Extension vs New Kitchen: Which Adds More Value?
£50k kitchen vs £75k extension ROI analysis. Kitchen adds 5-10%, extension adds 10-15%. Combined strategies and decision framework.
8 min read
Costs
Hidden Costs of London Extensions: What Builders Don't Tell You
The real costs builders don't quote. Party wall £1-3k, asbestos £2-8k, drainage £3-15k, CIL charges. Add 15-25% to builder quotes for realistic budgets.
10 min read
Planning
Extension ROI London 2025: How Much Value Will You Add?
Will your extension pay for itself? Data-driven ROI analysis. Single storey adds 10-15%, loft conversions 15%, two storey 15-25%. When extensions make financial sense.
9 min read
Costs
Extension Financing London 2025: Loans, Mortgages & Payment Options
How to finance your London extension. Remortgage vs loans, further advance, staged payments. Compare costs for £50k-150k projects.
8 min read
Costs
London Extension Costs 2025: Real Project Data
Actual extension costs from 5,000+ London projects. Ground floor, loft, side return costs by borough with free calculator.
7 min read
Extensions
Side Return Extension London: Complete Guide
Everything about side return extensions in London. Average costs £55k-85k, planning vs permitted development, kitchen integration, and real examples.
5 min read
Extensions
Terraced House Extension London: Complete Guide
Extension options for London terraced houses. permitted development limits, party walls, side returns, wrap-around extensions, and cost breakdowns.
7 min read
Planning
Conservation Area Extension London: Rules & Costs
Building in conservation areas. Restricted permitted development rights, planning requirements, materials, costs, and getting approval in 600+ London areas.
6 min read
Planning
Party Wall Agreement London: Complete Guide
Everything about Party Wall Act. When required, the process, costs (£700-1,500 per side), timeline, and handling neighbour disputes.
7 min read
Extensions
Semi-Detached House Extension London
Extension options for semi-detached houses. permitted development limits, rear and side extensions, loft conversions, costs, and one-side party walls.
6 min read
Extensions
Kitchen Extension London: Design & Costs
Kitchen extension guide. Open-plan layouts, bi-fold doors, lighting, costs £75k-120k. Rear, side return, and wrap-around options.
7 min read
Planning
London Extension Timeline & Process 2025
Complete extension timeline from design to completion. 6-12 months typical. Planning, building regs, party wall, construction stages.
8 min read
Planning
Architect vs Online Service: Which Is Best?
Honest comparison of traditional architects vs online services like Mayfair Studio. Costs, design quality, when to use each approach.
7 min read
Borough Guides
Lambeth Extension Rules 2025: Costs & Guide
Complete guide to home extensions in Lambeth. Planning rules, basement SPD, conservation areas, design guidance, and typical costs. Updated 2025.
7 min read
Borough Guides
Hackney Extension Guide 2025: Costs & Rules
Complete guide to home extensions in Hackney. New SPD guidance, planning permission, conservation areas, basement policy, and typical costs. Updated 2025.
7 min read
Borough Guides
Camden Extension Guide 2025: Costs & Rules
Camden extension guide 2025: planning rules, permitted development, Article 4 directions, conservation areas, basement policy, and costs. Updated Oct 2025.
7 min read
Planning
Listed Building Extension London 2025
Extending a listed building in London needs listed building consent. Grade I and II rules, conservation officer advice, and realistic costs explained.
7 min read
Planning
Building Regs for Extensions 2025: Guide
Building regulations for home extensions: structural, fire, insulation and drainage rules explained. Approval costs £1,000–£2,000 with full inspection stages.
7 min read
Planning
Permitted Development Rights London 2025
Permitted development rights London 2025: size limits by type, Article 4 directions by borough, what you can build without planning permission. Oct 2025.
8 min read
Costs & Finance
Extend vs Move House London 2025
Should you extend or move house in London? Complete cost comparison including stamp duty 2025 changes, extension costs, moving costs, and ROI analysis.
7 min read
Extensions
Rear Extension London 2025: Cost & Planning
Rear extension London guide 2025: single-storey costs £75k–£120k, two-storey £110k–£150k. Permitted development limits, planning rules, and design options.
8 min read
Conversions
Loft Conversion London 2025: Costs & Guide
London loft conversion guide 2025: dormer, mansard, hip-to-gable costs £45k–£85k. Building regulations, planning rules, and common mistakes to avoid.
8 min read
Planning
Top Construction Challenges for London Home Extensions in 2025
Navigate the biggest obstacles facing London homeowners in 2025. Labour shortages, material costs up 12%, planning delays, and new building regulations explained.
15 min read
Planning
Top 10 Traffic Consultants London 2025
Ranked list of London traffic consultants for home extensions. Transport statements, parking surveys, Construction Management Plans from £350.
10 min read
Planning
Top 10 Drainage Consultants London 2025
Ranked list of London drainage consultants for home extensions. Thames Water Build Over agreements, CCTV surveys from £250, soakaway design specialists.
12 min read
Planning
Top 10 Tree & Ecology Consultants London 2025
Ranked list of London arboriculturists and ecologists for home extensions. BS5837 surveys from £350. Essential for TPO trees, bat surveys, and planning compliance.
10 min read
Planning
Newham Planning Refusals: Top 10 Reasons & How to Avoid Them
Data analysis of Newham planning refusals reveals 10 most common rejection reasons. Olympic regeneration zones, Victorian terraces. 92% prior approval success rate.
11 min read
Planning
Hammersmith & Fulham Planning Refusals: Top 10 Reasons & How to Avoid Them
Data analysis of H&F planning refusals reveals 10 most common rejection reasons. 67% conservation area coverage, Victorian terrace issues dominate. Expert tips to avoid refusal.
11 min read
Planning
Enfield Planning Refusals: Top 10 Reasons & How to Avoid Them
Data analysis of Enfield planning refusals reveals 10 most common rejection reasons. 24% relate to Green Belt, terracing effect issues account for 19%. Expert tips to avoid refusal.
12 min read
Planning
Top 10 Fire Safety Consultants London 2025
Ranked list of London fire safety consultants for home extensions. Fire strategy reports from £350. Essential for loft conversions, open plan layouts, and Building Regs compliance.
9 min read
Planning
Croydon Planning Refusals: Top 10 Reasons & How to Avoid Them
Data analysis of Croydon planning refusals reveals 10 most common rejection reasons. Suburban character issues account for 38%. Expert tips to avoid refusal.
11 min read
Planning
Greenwich Planning Refusals: Top 10 Reasons & How to Avoid Them
Data analysis of Greenwich planning refusals reveals 10 most common rejection reasons. 32% approval rate in conservation areas vs 68% elsewhere. Expert tips to avoid refusal.
12 min read
Conversions
Garage Conversion London 2025: Costs, Planning & Complete Guide
Complete guide to garage conversions in London. Costs from £15,000-£45,000, planning rules, building regulations, and how to maximise value. 4-8 week build time.
10 min read
Extensions
Adding a Bathroom to Your Extension London 2025: Costs & Value Guide
Complete guide to adding bathrooms in London extensions. Ensuite costs £8,000-£15,000, adds 4-5% to property value. Plumbing, planning, and design considerations.
9 min read
Planning
Energy Efficient Extensions London 2025: Part L, EPC & Sustainability
Build a sustainable extension in London. Part L 2021 requirements, EPC improvements, heat pumps, insulation standards, and how to reduce running costs.
11 min read
Planning
How to Choose a Builder London 2025: Vetting, Contracts & Red Flags
Complete guide to finding and vetting builders in London. Get quotes, check references, understand contracts, and avoid cowboys. Protect your extension project.
12 min read
Planning
Prior Approval London 2025: When You Need It & How to Apply
Complete guide to prior approval in London. Larger home extensions, office to residential conversions, and other developments that need council notification.
10 min read
Planning
DIY vs Professional Extensions: What Can You Do Yourself in London?
Should you DIY your extension or hire professionals? Which tasks you can legally do yourself, what requires qualified tradespeople, and how to save money safely.
9 min read
Planning
Structural Engineer Guide London 2025: When You Need One & Costs
Complete guide to structural engineers for London extensions. When you need one, what they do, typical costs £500-£2,000, and how to find a good one.
8 min read
Extensions
Extension Lighting Design 2025: Natural Light, LEDs & Planning
Complete guide to lighting your extension. Natural light strategies, LED layouts, Part L requirements, and how to create the perfect atmosphere.
10 min read
Extensions
Open Plan Kitchen Extension London 2025: Design, Costs & Layout Ideas
Complete guide to open plan kitchen extensions in London. Layout options, zoning strategies, structural considerations, and design tips for modern living.
11 min read
Planning
Extension Project Checklist 2025: Complete Step-by-Step Guide
Complete checklist for your London extension project. From initial ideas through to completion, every step you need to follow for a successful build.
15 min read
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