How much does a house extension cost in Nottingham? (2026)

6 min read

An extension is the classic way to add space and value to a Nottingham home — but it's also where budgets most often blow out. Here's what extensions typically cost locally in 2026 and how to keep your project on track.

Typical extension costs

As a guide, single-storey extensions in the Nottingham area run roughly £1,500–£3,000 per square metre of floor area, before fittings. So a modest 15m² rear kitchen extension is often £25,000–£45,000; a larger or higher-spec one more.

Double-storey extensions usually cost less per square metre than single-storey (you're sharing the roof and foundations across more space), but the total is higher because there's simply more of it.

Finishes make a big difference: kitchens, bathrooms, bi-fold doors, underfloor heating and high glazing can add many thousands on top of the shell.

What drives the price

Groundworks and foundations — sloping sites, trees, or poor ground can add cost before you're even out of the ground.

Structural work (steel beams for open-plan), the roof type (flat vs pitched, roof lanterns), and the level of glazing.

Planning and building regs, party-wall agreements with neighbours, and professional fees (architect, structural engineer).

Getting an accurate quote

Vague verbal figures cause most extension disputes. Ask for a written, itemised quote and a stage-payment schedule, and make sure the builder has public liability insurance.

Get two or three builders to quote the same drawings so you're comparing like for like. Posting the job on Rank My Builder gets it in front of verified local builders with reviews you can check.

FAQs

Do I need planning permission for an extension?

Many single-storey rear extensions fall under permitted development, but limits apply and conservation areas differ. Always check with Nottingham City Council or your local planning authority — your builder or an architect can advise.

How long does an extension take to build?

A typical single-storey rear extension is around 8–12 weeks on site once started, depending on size, groundworks and weather.

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