Is My House in a Conservation Area? How to Check (2026)

How to Check If Your House Is in a Conservation Area

There are four ways to check, ranging from instant to slow:

• 1.Use our free AI chat (instant). Enter your address on our homepage and ask "Is my house in a conservation area?" - it checks your exact location against the national planning constraints database in under 10 seconds. It also checks Article 4 directions, listed buildings, and TPOs at the same time.
• 2.Check planning.data.gov.uk (free, manual). The government's national dataset lets you search by location, but the interface is designed for professionals rather than homeowners. You need to navigate map layers and interpret GeoJSON boundaries.
• 3.Check your council's planning portal (free, varies). Most London boroughs publish interactive maps showing conservation area boundaries. Quality varies wildly - some are excellent (Lambeth, Camden), others are outdated PDF documents.
• 4.Request a property search (paid, slow). Your solicitor can run a local authority search for about £150-300, which includes conservation area status. This takes 5-15 working days and is usually done during house purchases, not extension planning.

What a Conservation Area Means for Your Extension

Conservation areas are designated by local councils to protect the character and appearance of areas of "special architectural or historic interest." Being inside one doesn't prevent you from extending - but it changes the rules significantly.

PD rights you lose in a conservation area

• •Side extensions - any extension to the side of your house needs planning permission, even small ones
• •Cladding and render - you cannot change the external materials of your house without permission
• •Rear extensions above one storey - two-storey rear extensions always need planning in conservation areas
• •Roof alterations visible from the road - dormer windows, roof extensions, or any changes to the roofline facing a highway
• •Satellite dishes facing the highway - even small installations need permission if visible from the street

PD rights you keep in a conservation area

• •Single-storey rear extensions - still permitted up to 3m (attached) or 4m (detached), provided they don't exceed 4m in height and use similar materials
• •Loft conversions with rear dormers - rear-facing dormers may still be PD if they meet the 40m³ / 50m³ volume limits, but this varies by conservation area
• •Internal alterations - no planning needed for internal changes (unless listed)

The prior approval (larger home extension) scheme does not apply in conservation areas. So the extended 6m/8m rear limits that apply elsewhere in London are unavailable to you.

London Boroughs Ranked by Conservation Area Count

We counted every conservation area designation published to the national planning.data.gov.uk platform. The variation is enormous - Richmond has 87 conservation areas while Barking & Dagenham has just 4.

What the Data Tells Us

• 1.Inner London is far more constrained. The average inner London borough has 42 conservation areas vs 26 for outer London. More historic building stock and higher land values drive more designations.
• 2.Count doesn't equal coverage. Kensington & Chelsea has "only" 41 conservation areas but they cover 73% of the borough. Westminster's 56 areas cover nearly all residential land. A borough with fewer, larger designations can be more constrained than one with many small ones.
• 3.Conservation areas correlate with property values. The 10 boroughs with the most conservation areas have a median terraced house price of £927k. The 10 boroughs with the fewest: £470k. Heritage protection and high values reinforce each other.
• 4.Conservation area status doesn't mean you can't extend. You just need planning permission instead of relying on PD. In practice, well-designed single-storey rear extensions are approved in conservation areas regularly - councils want sympathetic development, not zero development.

Extending in a Conservation Area: What to Expect

Planning permission in a conservation area adds time and cost to your project, but it's far from impossible. Here is what changes:

• •Planning application fee: £258 for householder applications (standard 2026 rate)
• •Decision timeline: 8 weeks (standard) or 13 weeks if the council's conservation officer needs to review
• •Design requirements: materials must be sympathetic - matching brick, slate/tile roofing, timber windows may be required
• •Additional cost: architect fees for planning drawings (£1,295-3,000) plus potentially a heritage/design and access statement

The total additional cost of going through planning vs PD is typically £1,500-4,000 including fees and professional time. For most extension projects costing £50-150k, this is a small fraction of the total budget.

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