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Greater London

Double-storey extension cost in Newham

Two-storey rear or side extensions adding kitchen/dining downstairs and a master bedroom or en-suite above — typically 40–60 m² of additional space.

Local context — Newham

Council
London Borough of Newham
Open planning portal →
Cost premium
+15-22% vs UK average (inner-London labour + tight site access)
Typical extension price
A 25 m² single-storey rear extension in Newham typically runs £72,000-£105,000 (standard to premium spec, 2026).
Building Control
Newham Building Control handles its own inspections in-house — booking lead time is typically 3-5 working days. Approved Inspectors (private BCBs) are also used widely across E13, E15 and E16.
Conservation & Article 4
Newham has 22 conservation areas including Maryland, West Ham Lane and Manor Park. Article 4 directions removing permitted development rights apply in parts of Forest Gate and Plaistow — check the council's conservation area map before assuming PD.
Local quirks that move the price
Most terraced streets need a parking suspension (£40-80/day) and a CPZ dispensation for the skip. Party-wall agreements are needed on ~70% of extensions due to terraced/semi density. Clay soil east of the River Lea regularly requires 1.5 m+ trenches or piled foundations.
High-demand areas in Newham
Forest GateStratfordPlaistowEast HamManor Park
Typical 50 m² project in Newham
£81,957
to
£132,614
Mid-range (premium spec): £107,099
standard
£81,957
premium
£107,099
luxury
£132,614
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Double-storey extension costs in Newham — FAQs

How much does a double-storey extension cost in Newham?

Double-storey extensions in Newham typically cost between £81,957 and £132,614 depending on size, specification and site conditions. A mid-range 50 m² project averages around £107,099. London pricing reflects higher labour rates, parking permits and tighter site access.

How long will it take?

Most double-storey extensions take between 6 and 16 weeks on site, depending on scope, structural complexity and planning requirements in Greater London.

Do I need planning permission?

Many double-storey extensions fall under permitted development, but conservation areas, listed buildings and larger projects in Newham can require a full planning application. Use the cost checker to see what applies to your address.

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Disclaimer: This is an industry-informed estimate for guidance only — not a fixed quote, valuation, survey or legal advice. Figures are based on regional averages and the details you provided. Site-specific factors (access, ground conditions, structural surprises, planning constraints) can materially change the cost. Always confirm with a site inspection, written quotes from qualified tradespeople, and supplier pricing before committing to work. Build Price IQ (trading under Services R Us Ltd) accepts no liability for any decisions, costs, losses or damages arising from the use of these estimates.