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North West England

Rear extension cost in Manchester

Single-storey rear extensions opening kitchens, dining and living space onto the garden — usually 30–50 m².

Local context — Manchester

Council
Manchester City Council
Open planning portal →
Cost premium
-6% vs UK average (North West labour rates, strong trade supply)
Typical extension price
A 25 m² single-storey rear extension in Manchester typically runs £50,000-£74,000 (standard to premium, 2026). Loft conversions in Chorlton/Didsbury Edwardian semis run £45,000-£68,000.
Building Control
Manchester Building Control is the council's in-house service with 3-4 day inspection lead time. Heavy private-AI competition (LABC, MD, Stroma) across M19, M20, M21 and Didsbury.
Conservation & Article 4
Manchester has 37 conservation areas including Didsbury Village, Chorlton Green, Victoria Park and Whalley Range. Article 4 directions covering external materials apply across most of Didsbury Village and Victoria Park.
Local quirks that move the price
Coal Authority searches are mandatory across much of south Manchester (M19, M21, M22) — historic shallow workings can add £3-8k for foundation upgrades. High water table in Withington/Chorlton requires perimeter drainage on most rear extensions. Tight Edwardian back-alley access often forces hand-dig and adds 1-2 weeks to programme.
High-demand areas in Manchester
DidsburyChorltonWhalley RangeWithingtonLevenshulme
Typical 40 m² project in Manchester
£60,332
to
£97,110
Mid-range (premium spec): £78,714
standard
£60,332
premium
£78,714
luxury
£97,110
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Rear extension costs in Manchester — FAQs

How much does a rear extension cost in Manchester?

Rear extensions in Manchester typically cost between £60,332 and £97,110 depending on size, specification and site conditions. A mid-range 40 m² project averages around £78,714.

How long will it take?

Most rear extensions take between 6 and 16 weeks on site, depending on scope, structural complexity and planning requirements in North West England.

Do I need planning permission?

Many rear extensions fall under permitted development, but conservation areas, listed buildings and larger projects in Manchester 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.