Newham Extension Guide 2026: Planning Permission, Costs & Local Rules
Newham is one of London's most terraced boroughs, built almost street by street from Victorian and Edwardian bay-fronted rows. It also carries a borough-wide Article 4 direction, though not the one most homeowners expect. Here is what actually applies before you extend.
TL;DR - The Quick Answer
Extending in Newham in 2026 typically costs £2,800–£3,800 per m² for a single-storey rear extension, among the more affordable rates in inner-east London. Most terraced and semi-detached houses retain standard permitted development rights for extensions: the borough-wide Article 4 direction in force since July 2013 removes permitted development only for converting a house into a small HMO, not for building a rear or side extension. Nine conservation areas cover parts of Manor Park, Forest Gate, East Ham and Stratford, where full planning permission is required. Newham has an 85% householder approval rate, and prior approval succeeds 92% of the time where it applies.
Newham: A Borough of Terraces
Newham is home to roughly 355,000 people across around 122,000 dwellings, stretching from the Victorian streets of Forest Gate and Manor Park in the west to the regenerated Royal Docks and Stratford in the east. Terraced houses are the dominant property type across the borough: they accounted for 49.3% of all residential sales in Newham in the year to March 2023, more than any other house type. A substantial share of that stock is genuinely old - around 38.8% of Newham's dwellings were built before 1919, reflecting the terraced streets laid out as London's docks and railways expanded eastward.
That housing pattern shapes almost every planning question in the borough. Bay-fronted Victorian terraces with narrow side returns and rear outriggers are the default house type in much of Newham, which means extension projects here tend to follow a narrower set of patterns than in boroughs dominated by semis or detached houses - and the planning issues that come up (party walls, loss of light between close-set houses, matching brick and roof pitch) are the terraced-house issues covered in our terraced house extension guide.
Housing character by area
Dense Victorian and Edwardian terraces, many with bay windows and rear outriggers. Some of the most protected streets in the borough sit here, including the Woodgrange Estate, Romford Road and Durham Road conservation areas.
Predominantly Victorian and interwar terraces on a tight grid, with a mix of two-up two-down cottages and larger bay-fronted houses. Rear gardens are typically modest, so side return and rear infill extensions are common.
A mix of older terraces and substantial post-2012 regeneration, including new-build flats and townhouses. Planning is generally more supportive here, though the Stratford St John's, Sugar House Lane, Three Mills and University conservation areas cover pockets of historic and industrial heritage.
Newer housing stock, much of it estates and flats built from the 1980s onward. Extension activity is lower here than in the Victorian terraced core, and PD rights generally apply without the neighbour-proximity issues typical of terraces.
Householder approval rates track this pattern closely. Regeneration areas around Stratford and the Olympic Park see approval rates as high as 91%, while the denser Victorian terraced streets of Manor Park and Forest Gate, where conservation area status and tight neighbour spacing make schemes harder to design around, see approval rates closer to 79-81%. East Ham and Plaistow, with their mix of Victorian and interwar terraces, sit in between at 85-86%.
| Area | Character | Approval rate |
|---|---|---|
| Stratford / Olympic Park | Regeneration | 91% |
| Custom House | Regeneration | 88% |
| Beckton | Modern estates | 87% |
| East Ham | Victorian terraces | 86% |
| Plaistow | Mixed terraces | 85% |
| Forest Gate | Victorian + conservation | 81% |
| Manor Park | Victorian + conservation | 79% |
Source: Mayfair Studio project data • Data as of 2025
Newham's Local Plan and the "Altering and Extending Your Home" SPD
Where full planning permission is required, Newham assesses householder extensions against its Local Plan alongside a dedicated Supplementary Planning Document, Altering and Extending Your Home (adopted February 2018). Unlike some outer-London SPDs that set out precise numeric depth and height limits, Newham's document is design-led: it structures every assessment around four considerations.
The four assessment considerations
For properties within a conservation area, the council reads this SPD alongside the design guidance published for that specific conservation area, so the bar is higher than for a standard terraced street.
Newham's Article 4 Direction: HMOs, Not Standard Extensions
Newham has had a borough-wide Article 4 direction in force since 31 July 2013, covering the whole of the borough except the area formerly under the control of the London Legacy Development Corporation around the Olympic Park. It is one of the longest-standing HMO Article 4 directions in London, and it is worth understanding precisely what it does and does not affect.
The direction removes permitted development rights under Class L of Part 3 of the GPDO 2015, which would otherwise let a homeowner convert a house (Use Class C3) into a small House in Multiple Occupation for three to six unrelated people (Use Class C4) without planning permission. Newham introduced the direction to slow the loss of family homes to HMO conversion. For full detail on how HMO Article 4 directions work across London, see our Article 4 HMO borough guide, which lists Newham among the boroughs with a borough-wide direction dating from 2013.
What this means in practice for extensions
- If you are simply extending or altering a single-family home, the Article 4 direction does not apply. Standard national permitted development rights for extensions still operate across Newham, outside conservation areas
- If you intend to convert a property into a small HMO (3-6 unrelated occupiers) anywhere in the borough, you need full planning permission - permitted development rights for that change of use do not exist here
- Larger HMOs of 7 or more occupants are always Sui Generis and always need planning permission, in every London borough, regardless of any Article 4 direction
It is a common misconception to see "Newham has an Article 4 direction" and assume it removes permitted development for extensions, the way Hampstead Garden Suburb's Article 4 does in Barnet. It does not. If your project is a rear extension, loft conversion or side infill on a house you will continue to occupy as a single dwelling, this direction is not the constraint to worry about - conservation area status is.
The council's own cabinet report on the direction is candid about the trade-off it accepted: introducing the Article 4 direction meant forfeiting an estimated £7,500 a year in permitted development income, against processing, monitoring and enforcement costs put at around £60,000 a year. The council judged that cost worth carrying to slow the loss of family-sized terraced houses to HMO conversion, which gives some sense of how seriously Newham treats its terraced housing stock as a strategic asset, separate from the question of whether any individual family can extend the house they live in.
Flood Risk Near the Thames and Lea Valley
Newham has no Green Belt land, so extensions are not subject to the cumulative floor-area caps that apply in Green Belt boroughs. The constraint worth checking instead is flood risk. Parts of the borough closest to the Thames and the Lea Valley sit within Environment Agency flood zones, and while flood risk is a minor cause of refusal in Newham compared with neighbour impact, it can require a flood risk assessment and raised finished floor levels for extensions in the affected areas.
Check the Environment Agency's flood map for your specific address before finalising floor levels or basement plans. If your property sits in Flood Zone 2 or 3, your design team or planning consultant should build a flood risk assessment into the application from the outset rather than responding to it after a validation query.
Conservation Areas in Newham
Newham has nine designated conservation areas. Compared with a borough like Barnet or Camden this is a modest number, but the areas that do exist sit squarely within the terraced streets most likely to be extending:
Woodgrange Estate (Forest Gate, E7)
A distinctive planned Victorian estate of terraced and semi-detached houses. One of the most tightly controlled residential conservation areas in the borough, with its own Article 4 direction covering permitted development for alterations such as replacement windows and front boundary treatments.
Romford Road (Forest Gate, E7)
Covers a stretch of substantial Victorian terraced housing along Romford Road. Extensions visible from the street require full planning permission and materials that respect the existing brick and roofline.
Durham Road (Manor Park, E12)
A conservation area of Victorian terraced streets in Manor Park, with its own Article 4 direction covering specific permitted development rights in addition to the borough-wide HMO direction.
East Ham (E6)
Covers part of East Ham's historic town centre and surrounding streets. Extensions and alterations here are assessed against the borough SPD and the area's specific character appraisal.
Forest Gate Town Centre (E7)
A smaller commercial and residential conservation area around the town centre, distinct from the surrounding Woodgrange and Romford Road residential areas.
Stratford St John's, Sugar House Lane, Three Mills and University (Stratford, E15)
Four smaller conservation areas around Stratford covering historic church grounds, former industrial buildings and the Bow Back Rivers. Less relevant to standard terraced-house extensions, but material if your property borders one of these historic clusters.
Outside these nine areas, the vast majority of Newham's terraced streets carry no conservation area restriction, and standard permitted development rights for extensions apply. Always check your specific address: conservation area boundaries can run down the middle of a street, and Newham's planning pages let you search by postcode to confirm.
Permitted Development for Newham's Terraced Houses
For most of Newham's housing stock - terraced and semi-detached houses outside the nine conservation areas - the national permitted development rules apply in full. Because so much of the borough is genuinely terraced rather than semi-detached or detached, the terraced-house limits in the table below are the ones that matter for the majority of Newham homeowners:
| Extension type | PD limit | Prior approval limit |
|---|---|---|
| Single-storey rear (terraced/semi) | 3m depth | Up to 6m |
| Single-storey rear (height) | 4m max (3m eaves within 2m of boundary) | Same height limits apply |
| Side extension | Half width of original house | N/A - full planning if over PD limit |
| Two-storey rear | 3m depth, 7m from rear boundary | N/A - almost always full planning in practice |
| Loft conversion (rear dormer) | 40m³ (terraced), volume added to roof space | N/A |
Two features of Newham's Victorian terraces come up repeatedly when applying these limits: outriggers and side returns. Most bay-fronted terraces in Forest Gate, Manor Park, East Ham and Plaistow were built with a single-storey rear outrigger - a closet wing running alongside the main rear elevation - which leaves a narrow side return alongside it. Because permitted development depth is measured from the original rear wall of the house as it stood on 1 July 1948 (or as built, if later), an existing outrigger changes where that 3m or 6m measurement starts. Filling in the side return alongside an outrigger, or extending across the full rear width including the outrigger, needs careful measurement before you assume a scheme fits within permitted development. Our dedicated guides to side return extensions and terraced house extensions cover this in detail.
A worked example: a typical Forest Gate terrace has a main rear elevation and a single-storey outrigger projecting a further 2-3m beyond it, with a 1-1.5m side return alongside the outrigger. If a homeowner wants to infill the side return and extend the full rear width to create one open-plan kitchen-diner, the scheme is really two moves in one: infilling the side return (a side extension, assessed against the half-width rule) and extending beyond the original rear wall (assessed against the 3m/6m depth rule, measured from whichever wall is legally "original"). Getting this wrong is one of the more common ways a homeowner discovers, partway through design, that a scheme they assumed was permitted development actually needs a full application.
Before relying on PD rights, confirm your property is not in one of Newham's nine conservation areas and check whether a property-specific Article 4 direction applies (Woodgrange Estate and Durham Road both carry their own directions in addition to the borough-wide HMO one). Our free AI checker looks up your address against these designations in seconds.
Planning Applications in Newham
When full planning permission is required, applications are submitted through Newham's planning portal. Newham processes around 2,400 householder applications a year, and its overall approval rate for householder extensions runs at approximately 85%, slightly above the London average.
Application process
Approval rates vary noticeably by extension type. Single-storey rear extensions have an approval rate around 89%, while two-storey rear extensions run at roughly 71% (a 29% refusal rate), reflecting how much harder it is to satisfy neighbour daylight and privacy tests on a second storey between terraced houses. Loft conversions sit at around 82% and side extensions at around 74%. Our analysis of Newham planning refusals breaks down exactly why applications fail and how to design around the most common reasons - the summary is below.
| Refusal reason | % of refusals | Most relevant to |
|---|---|---|
| Loss of light to neighbours | 32% | Two-storey rear extensions between close-set terraces |
| Overbearing / enclosure | 18% | Two-storey rear extensions near a boundary |
| Harm to character or streetscene | 15% | Conservation area properties, front alterations |
| Privacy / overlooking | 12% | Loft conversions, upper-floor windows |
| Terracing effect | 8% | Side extensions on semi-detached houses |
| Excessive dormer size | 6% | Rear dormer loft conversions |
Source: Mayfair Studio project data • Data as of 2025
Half of all refusals in Newham trace back to neighbour amenity in some form - light, enclosure or privacy. On a borough built almost entirely of terraces, where rear extensions sit close to a shared boundary by definition, this is the single most useful thing to design around before submitting.
Extension Costs in Newham 2026
Newham sits among the more affordable boroughs in inner-east London for construction. Against our borough-wide benchmark of London extension costs in 2026 (£3,200-£4,600 per m²), Newham typically runs below the London-wide range, closer to the discount seen in outer boroughs than to inner or prime-central rates. All figures below include VAT at 20% and cover construction cost only (not kitchen, professional fees, or contingency).
| Extension type | Typical size | Construction cost (inc VAT) | All-in estimate |
|---|---|---|---|
| Rear extension (single-storey) | 3m × 5m (15m²) | £42k–£60k | £50k–£75k |
| Side return (infill) | 2m × 8m (16m²) | £38k–£56k | £46k–£70k |
| Loft conversion (dormer) | 25–35m² | £42k–£65k | £50k–£78k |
| Two-storey rear extension | 3m × 5m × 2 (30m²) | £78k–£115k | £92k–£140k |
| Wrap-around (side return + rear) | 25–35m² | £62k–£95k | £75k–£115k |
Note: figures are derived by applying Newham's typical market discount to the London-wide averages in our costs guide, not independent Newham-specific project data.
Conservation area premium: add 10-20% in Woodgrange Estate, Romford Road, Durham Road and East Ham for matching brick, heritage-profile windows and additional design scrutiny.
| Extension type | Typical size | Construction cost (inc VAT) | All-in estimate |
|---|---|---|---|
| Rear extension (single-storey) | 3m x 5m (15m²) | £42k-£60k | £50k-£75k |
| Side return (infill) | 2m x 8m (16m²) | £38k-£56k | £46k-£70k |
| Loft conversion (dormer) | 25-35m² | £42k-£65k | £50k-£78k |
| Two-storey rear extension | 3m x 5m x 2 (30m²) | £78k-£115k | £92k-£140k |
| Wrap-around (side return + rear) | 25-35m² | £62k-£95k | £75k-£115k |
Source: Mayfair Studio project data • Data as of 2026
Professional fees to add
Planning Tips for Newham
Do not confuse the Article 4 direction with a PD ban on extensions
Newham's borough-wide Article 4 direction targets HMO conversions under Class L, not standard house extensions. If you are simply extending the home you live in, check conservation area status rather than assuming the Article 4 direction blocks you.
Measure from the original rear wall, accounting for any outrigger
Many Newham terraces were built with a rear outrigger. Permitted development depth is measured from the original rear wall as built (or as it stood on 1 July 1948), so get a measured survey before assuming your side return or rear infill fits within the 3m or 6m limit.
Use prior approval where your scheme qualifies
Prior approval (the larger home extension neighbour consultation scheme) succeeds 92% of the time in Newham and is decided within 42 days. If your rear extension is between 3m and 6m deep on a terraced or semi-detached house, this route is faster and more reliable than full planning permission.
Address neighbour impact head-on for two-storey schemes
Loss of light and overbearing impact are the two most common reasons for refusal in Newham, particularly on two-storey rear extensions between close-set terraces. A daylight and sunlight assessment, stepped-back upper floor, or part single/part two-storey design all reduce this risk.
Serve party wall notice early
Almost every extension on a Newham terrace involves excavating within 3m of a shared party wall. Serve notice at least two months before work starts, and budget for a party wall surveyor on each side of a shared boundary.
A single-storey rear extension in Newham costs £42k-£60k for construction inc VAT, or £50k-£75k all-in - among the more affordable rates in inner-east London. Newham's Article 4 direction (since July 2013) covers HMO conversions, not standard extensions; most terraced houses outside the borough's nine conservation areas retain full permitted development rights. Newham has an 85% householder approval rate and a 92% prior approval success rate.
Frequently Asked Questions
Do I need planning permission for a house extension in Newham?
Most terraced and semi-detached houses in Newham retain national permitted development rights, letting you build a single-storey rear extension up to 3m deep (or up to 6m via prior approval) without planning permission. You need full planning permission if your property is in one of Newham's nine conservation areas, if the extension exceeds permitted development limits, or for a two-storey extension beyond PD limits.
Does Newham's Article 4 direction stop me extending my house?
No. Newham's borough-wide Article 4 direction, in force since 31 July 2013, removes permitted development rights for converting a house into a small HMO (Use Class C4). It does not affect standard rear, side or loft extensions to a single-family home. Two smaller areas, Woodgrange Estate and Durham Road, carry additional Article 4 directions covering specific alterations within those conservation areas.
How much does a house extension cost in Newham in 2026?
All figures inc VAT: a 3m×5m single-storey rear extension costs £50k-£75k all-in (construction plus design fees, structural engineer, building regs and party wall costs). A side return costs £46k-£70k. A loft conversion costs £50k-£78k. A two-storey rear extension costs £92k-£140k. Add 10-20% for work in one of Newham's conservation areas.
What conservation areas are there in Newham?
Newham has nine conservation areas: Woodgrange Estate, Romford Road, Durham Road, East Ham, and Forest Gate Town Centre (all covering Victorian terraced streets in Forest Gate, Manor Park and East Ham), plus Stratford St John's, Sugar House Lane, Three Mills and University around Stratford. Full planning permission is required for extensions within any of these boundaries.
Can I extend a terraced house with a rear outrigger under permitted development?
Yes, but the depth limit is measured from the property's original rear wall, which may sit behind an existing outrigger rather than at the current rear elevation. Get a measured survey to establish the correct starting point before assuming a side return infill or rear extension fits within the 3m (or 6m prior approval) limit.
How long does planning permission take in Newham?
Standard householder applications target 8 weeks from validation. Prior approval applications, where a scheme qualifies under the larger home extension scheme, are decided within 42 days and succeed 92% of the time in Newham - the most reliable route for a qualifying rear extension.
What is the 'Altering and Extending Your Home' SPD?
It is Newham Council's supplementary planning document, adopted February 2018, that sets out how the Local Plan is applied to householder extensions. It assesses proposals against four considerations: urban design quality, neighbourly development (daylight, privacy, outlook), sustainability, and meeting the needs of homeowners. For conservation area properties, it is read alongside the design guidance for that specific area.
Do I need a party wall agreement for an extension in Newham?
Almost certainly yes. The Party Wall Act 1996 applies whenever you excavate foundations within 3m of a neighbouring structure, which covers the vast majority of extensions on Newham's terraced streets. Serve notice at least two months before work starts and budget £800-£1,400 per adjoining neighbour for surveyor fees.
Summary
For most Newham homeowners - in Forest Gate, Manor Park, East Ham, Plaistow, Stratford, or the Royal Docks area - the planning landscape is more straightforward than the borough's reputation for Article 4 controls suggests. Standard permitted development rights apply across the great majority of the borough's terraced streets, the council's SPD gives clear (if design-led rather than numeric) guidance, and construction costs run below the London-wide average.
The genuine exceptions are the nine conservation areas, where full planning permission and heritage-sensitive materials are required, and the borough-wide Article 4 direction, which matters only if you plan to convert a property into an HMO rather than extend a family home. If your property has a Victorian rear outrigger, get a measured survey before finalising a side return or rear extension design, since it changes where permitted development depth is measured from.
The first step for any Newham extension project is confirming your planning status: conservation area, Article 4 exposure, and flood zone if you are close to the Thames or Lea Valley. That single check determines your route and your realistic timeline.