How Much Does a House Extension Cost in Plymouth in 2026?

Plymouth's housing is wonderfully varied — Regency and Victorian terraces around the Hoe and Stoke, substantial villas in Mannamead and Peverell, post-war semis and modern estates in Plympton and Plymstock — and extension costs vary with it. Here is honest guidance for 2026.

As a broad starting point, a well-built single-storey extension in Plymouth typically costs between £1,800 and £2,500 per square metre, with double-storey work often better value per metre. For a range tailored to your project type and size, our cost calculator takes about a minute — then treat it as a conversation starter, not a quotation.

Plymouth has its own cost drivers. Coastal exposure is the big one: salt air and driving rain are hard on poor materials, so fixings, external finishes and glazing specifications need to be marine-grade — money well spent, because the alternative is premature failure. Hillside plots, common across the city, can involve retaining structures and more complex drainage. And the Victorian suburbs come with the usual period realities: party walls, tight access and structural steelwork to open up rear walls.

Conservation areas cover the Hoe, Stonehouse, Devonport and several Victorian suburbs, and listed buildings are numerous — if that is your home, full planning permission and careful detailing are part of the journey, and we will tell you honestly what is likely to be acceptable before you spend on design.

As always, be cautious of firm prices given over the phone. A figure you can rely on follows a site visit and an itemised proposal — that is how every NOOR project begins, and the consultation costs nothing.

We cover the whole city and the South Hams — see our builders in Plymouth page for how we work locally, or request a consultation and we will give you a straight answer.