TL;DR — Key Facts
- Build cost per sqm: £2,500 – £3,800 (inner London borough)
- Council planning fee: £548 (householder application, 2026)
- Typical projects: rear extension, side-return, two-storey, wraparound
- Conservation areas: 8 designated areas in Newham
- Permitted Development: Restricted by Article 4 in some areas
What does Newham do with an extension application?
It says yes to most of them, takes its time, and enforces hard. Newham granted 85.8% of the 1,313 householder applications it decided in the twelve quarters to March 2026, a little above the London figure of 83.0%. It also issued 209 enforcement notices over the same period, which sorted across all 33 boroughs is the fifth highest count — behind Westminster on 419, Brent on 399, Barnet on 309 and Ealing on 210 — and it did that against one of the smaller householder caseloads in the capital. Designation is barely a factor here: eight conservation areas cover about 68 hectares of a 3,858-hectare borough. What slows things down is the queue, not the heritage.
| Measure | Newham | London |
|---|---|---|
| Householder approval rate | 85.8% | 83.0% |
| Householder decisions made | 1,313 | 77,680 |
| Enforcement notices issued | 209 | 3,554 |
| Lawful development certificates issued | 1,028 | — |
| Extension applications in the Datahub | 4,526 | 60% approved |
| Householder appeals allowed after refusal | 38.3% of 196 | 40.8% of 13,067 |
Sources: decision and enforcement figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026; the Datahub row from the Planning London Datahub, retrieved 15 August 2026, phrase-matched and comparable within Newham only; appeals from Planning Inspectorate casework decided 2016–2026. Build costs on this page are our own 2026 London range, not a published statistic.
What does a Newham extension cost in 2026?
Costs are what this page is for. The route through the planning system itself — drawings, validation, determination — is set out on house extensions in Newham.
Budget £2,500 to £3,800 per square metre for the build. That is an inner London rate applied to a borough where the median home sold for £450,000 in 2025 and a terraced house for £480,000 across 798 registered transactions (HM Land Registry Price Paid Data) — so the ratio of build cost to property value is tighter here than in most of inner London, and overspecifying is expensive in a way it is not further west. Drawings, the planning fee and VAT sit outside that range, as does a Flood Risk Assessment if the address needs one.
On Newham's Victorian terraces the extension is usually a side return, and the cost turns on removing the flank wall of the existing back addition - a structural job with temporary support and a party wall on each side. Where the scheme is part of creating additional rooms for letting, the Article 4 position on houses in multiple occupation adds a consent cost that has nothing to do with the build.
Typical extension costs in Newham (build only)
Build cost is not the whole cost. Drawings, structural design and the council's own fees sit on top — a householder planning application costs £548 in statutory fee alone. Our drawing fees are held 30% below the going rate for London architects.
What changes the price on a Newham terrace?
Newham has ten conservation areas, second-fewest in London, so heritage rarely drives cost here. Enforcement does: 209 enforcement notices and 292 contravention notices in three years (MHCLG planning statistics, retrieved 1 September 2026), in a borough whose Article 4 Direction targets conversion to houses in multiple occupation. If an extension is part of increasing occupancy rather than adding family space, the regulatory position changes entirely.
Conservation areas
Eight, and you can list all of them: the Woodgrange Estate in Forest Gate at 30.0 hectares, Forest Gate Town Centre at 8.3, Stratford St John's at 8.3, Durham Road in Manor Park at 6.8, East Ham Town Centre at 5.5 and the University Area at 4.6, plus two smaller designations — about 68 hectares between them. The register holds no designation date for any of the eight, so we give extent rather than year. Only Woodgrange is large enough that a householder is likely to find themselves inside it by chance, and it is a coherent late-Victorian estate where the front elevations matter. If your address is inside one of the eight, expect a full application at £548 and a materials specification rather than a note; if it is not, and statistically it is not, none of this applies to you (planning.data.gov.uk, retrieved 1 September 2026).
Article 4 Directions
Newham has Article 4 Directions in place. Article 4 Direction requires planning permission for any HMO conversion, plus restrictions on office-to-residential in Stratford and Royal Docks. Where Article 4 applies, works that would normally be Permitted Development require a full planning application. This adds £548 to the council fee and typically 2-3 months to the project timeline, which can affect overall costs if you are renting alternative accommodation during the build.
Property type
Newham is two boroughs by age with almost nothing in between. Just over a quarter of its 132,600 homes predate 1900 — 27.9% — and 21.4% have been built since 2010, the product of the Olympic regeneration and the Royal Docks. The interwar bands that dominate outer London barely exist here: 2.9% from the 1920s and 2.0% from the 1930s, against 6.2% and 16.0% across the capital (VOA council tax stock, 31 March 2025). So the extension question resolves quickly. A Victorian terrace in West Ham, Forest Gate or Plaistow takes a side-return or a rear addition and there is precedent on every street. A flat in a post-2010 block has no permitted development rights at all, and a two-storey rear extension is not the leaseholder's to build.
Access and logistics
Assume everything goes through the house. The terrace runs through West Ham, Forest Gate and Plaistow are unbroken, with no side passage and no rear service road, so every barrow of spoil and every bag of ballast crosses the hall floor. Price that as labour, not as an inconvenience. There is a second constraint here that no other London borough faces on this scale: Environment Agency Flood Zone 2 covers 48.55% of Newham and Zone 3 covers 39.4%, the third largest share in the capital after Hammersmith and Fulham and Southwark. Those zones map the floodplain as it would be with no defences at all, taking no account of the Thames Barrier or the tidal walls, so they are not a statement about whether your street floods. What they do determine is paperwork: on a plot inside one, the application will need a Flood Risk Assessment, and the ground floor level may need setting higher than you planned.
Our drawing fees for Newham extensions
A fixed fee, agreed before the survey, with no hourly billing behind it. The programme advice for this borough is the part worth reading twice: Newham decided 67.9% of minor applications inside the statutory period, the lowest figure of all 33 London boroughs against a London average of 84.4%, and 83.3% of householder cases inside eight weeks. Submit early and do not book the contractor against the eight-week date. The fee covers a valid submission to Newham Council and the building regulations drawings.
Drawing fees for extensions in Newham
Work starts at the house, not the drawing board: a measured survey records the building as built. Everything else is drawn off it: plans and elevations for the house as found, the same pair again as proposed, a site plan, and — on the routes that demand it — a design and access statement. The survey earns its keep in Newham more than in most boroughs: 27.9% of the borough's 132,600 homes pre-date 1900 (VOA CTSOP4.1, dwelling counts at 31 March 2025), and a terrace re-roofed, underpinned and re-plastered across thirteen decades is rarely the shape any original drawing claims. Our MCIAT chartered architectural technologists carry the job from that first visit to submission, and deal with Newham Council for you.
We work across Newham: E6, E7, E12, E13, E15, E16, and E20 in the Olympic Park. E12 and E15 each cross a borough line, so we confirm which authority validates before anything is lodged.
Planning or permitted development in Newham?
On a house, often. A single-storey rear extension can run 6 metres past the original rear wall on a terrace or semi, or 8 metres on a detached house, through the prior approval procedure that lets the neighbours object — Newham determined 311 of those and refused 70, a 22.5% refusal rate against 24.9% across London. The borough-wide Article 4 Direction removes the right to convert a family house into a house in multiple occupation, with further restrictions on office-to-residential conversion in Stratford and the Royal Docks; neither touches an ordinary extension. What does touch it is the building type. Permitted development belongs to dwellinghouses, and with a fifth of this borough built since 2010 and overwhelmingly flats, the first question is whether you have any rights to use.
Newham has ten conservation areas, second-fewest in London, so most properties retain their permitted development rights untouched. Where designation applies, the terraced stock of West Ham and Forest Gate means the side-extension rule does nothing and the materials restriction does the work. The borough's wider control is the Article 4 Direction on houses in multiple occupation.
Two-storey extensions require full permission. On Newham's Victorian terraces the form is a first floor over the rear projection, and the light relationship with the adjoining back addition is the usual point of contention. The borough-specific caution is separate: if the additional bedrooms are intended to increase occupancy, the Article 4 Direction on houses in multiple occupation makes that its own consent question.
Newham issued 1,028 certificates of lawful development in three years (MHCLG planning statistics, retrieved 1 September 2026), a high number relative to its 1,313 householder decisions. That ratio makes sense in a borough where the Article 4 Direction makes the permitted development question genuinely uncertain for many owners: the certificate is how the uncertainty gets resolved on paper rather than at an enforcement visit.
Frequently asked questions
How much does a house extension cost in Newham?
Between £2,500 and £3,800 per square metre, which puts a 15 to 20 square metre single-storey rear extension at roughly £37,500 to £76,000 for the build alone. Add drawings, the £548 householder application fee where permission is needed, a structural engineer for the opening into the existing rear wall, a party wall surveyor for the neighbours on either side, and VAT. On these terraces the party wall element is not optional: you have two shared walls and the new steel bears on both of them.
Can I extend under Permitted Development in Newham?
Newham has only ten conservation areas, second-fewest in London, so most addresses here keep their permitted development rights intact. Where a property is designated, the usual restrictions on side extensions and materials apply. The control with far wider reach in this borough is the Article 4 Direction on houses in multiple occupation, which is unrelated to conservation designation.
How long does a house extension take in Newham?
Five to eight months is the honest span for a Newham extension, from instruction to handover. Two or three weeks go on the survey and the drawing set; eight weeks on determination by Newham Council, if an application turns out to be necessary; two to four more on building regulations; then eight to sixteen on site. The middle number carries a local caveat. PS2 puts 929 Newham householder decisions on the eight-week clock, and 774 of them beat it — 83.3%, where the 33 boroughs pooled together reach 92.5% (MHCLG PS2, twelve quarters ending March 2026). Newham runs slower than the London norm, so carry a fortnight of slack at that stage.
Do I need a Party Wall Agreement for an extension in Newham?
Two adjoining owners on the terraced stock, and rear extension foundations that will sit within three metres of both. Notice runs a month for excavation and two for work to the wall. In a borough with this level of enforcement activity, keeping the party wall award filed alongside the planning documents is worth the effort - together they show what was done and under what authority.
What experience do you have with extensions in Newham?
We prepare extension drawings for properties across all Newham postcodes (E6, E7, E12, E13, E15, E16). Our MCIAT chartered architectural technologists understand Newham Council's policies, design guides, and local precedents. We have a council-ready drawing review across all 33 London boroughs.
