Home Extension Design in Newham: Planning, Costs and What's Realistic in 2026
A home extension in Newham typically costs £3,200 to £4,500 per m² to build in 2026, at mid-range specification, before VAT and professional fees. Planning here is more straightforward than in most of London: the borough has nine conservation areas, and only three of them, Durham Road, Romford Road and Woodgrange Road, carry Article 4 Directions that restrict householder works. Most of Newham's Victorian and Edwardian terraces sit in ordinary permitted-development territory, and the council offers householders free written pre-application advice. This page covers what the council allows and what it costs.
Studio MASS is a residential design practice led by an architectural technologist. We design and deliver extensions, loft conversions and refurbishments across London, from first feasibility check to completed build.
Do you need planning permission for an extension in Newham?
Many Newham extensions do not need planning permission. Outside conservation areas, a single-storey rear extension up to 3 metres beyond the original rear wall (4 metres on a detached house) usually falls under permitted development, and that covers most of the terraced streets of East Ham, Plaistow, Manor Park and Forest Gate. Inside a conservation area, side extensions and rear extensions beyond 3 metres, and any rear extension of more than one storey, need planning permission.
One borough-wide exception is worth knowing even for family houses: since 31 July 2013 Newham has had an Article 4 Direction covering the whole borough (outside the former Legacy Corporation area) that removes permitted development rights for converting a house into a small HMO, so that change of use always needs planning permission here.
Which Newham conservation areas have extra controls?
Article 4 Directions currently apply in three of Newham's nine conservation areas: Durham Road, Romford Road and Woodgrange Road, the last covering Forest Gate's Woodgrange Estate. Where they apply, the council lists work that needs consent, including replacing windows, doors and roof materials, new hard surfaces for parking, demolishing or rebuilding walls and fences, extensions, dormers and satellite dishes, painting, cladding or pebble-dashing walls, and removing stucco or canopies.
The council's stated test is that it will only allow work which keeps or improves the look and character of the conservation area. Helpfully, Newham offers free written pre-application advice for householders, which is a cheap way to test a scheme in these streets before committing to a full application.
How much does a home extension cost in Newham in 2026?
Newham sits in London's mid-price construction zone. From our 2026 Extension Cost Guide, built from BCIS indices, FMB build cost data and our own completed projects:
A single-storey extension in Newham costs £3,200 to £4,500 per m² at mid specification in 2026. A loft conversion runs £3,200 to £3,800 per m². Conservation area projects carry roughly 15% on top for material restrictions and period-appropriate detailing. These figures are construction only; VAT at 20% and professional fees are additional.
Before a brick is laid, expect £8,000 to £16,000 in professional and statutory fees on a typical project, including the £548 planning application fee that applies from April 2026.
The full breakdown is in our free Extension Cost Guide 2026, no email required. For a sense of how we work and what finished projects cost, see the Rathcoole Gardens project page and the Drakefield House project page, both completed London projects with real budgets.
Who designs your extension if not an architect?
An architectural technologist designs buildings with a focus on how they are built: construction detail, building regulations, and buildability, alongside layout and light. In the UK "architect" is a legally protected title, so we don't use it. What matters for a Newham extension is the same either way: design within the local planning context, technical drawings a builder can price accurately, and someone accountable from first idea to finished build. That is what we do, through one team and five stages, starting with a Stage Zero review that tells you what is realistic for your budget and what planning will allow before design begins.
Start with a conversation
The best starting point is our short questionnaire. It takes a few minutes and tells us about your home, your brief and your budget. We review it and arrange a free thirty-minute call, with an honest view on feasibility either way.
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