Extensions cost in Plymouth
2026 prices for Devon · South West
Extensions in Plymouth typically costs between £30,500 and £122,500, with most homeowners landing near £76,500. Local pricing sits about 2% above the UK average. Travel time across a dispersed region and a high share of period property add cost, offset by lower overheads than the South East.
£30,500 – £122,500
UK average £2,200 per m² · Plymouth index 102
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Extensions prices in Plymouth by finish level
| FINISH LEVEL | PLYMOUTH COST | WHAT'S INCLUDED |
|---|---|---|
| Budget | £30,500 – £46,000 | Entry-level materials, existing layout retained |
| Mid-range | £44,500 – £66,500 | Better fittings, some layout change |
| Premium | £59,500 – £89,500 | High-specification materials and full redesign |
£42,075
About 55% of a typical Plymouth job, at South West day rates.
£34,425
Materials pricing is broadly national — this is where specification, not location, drives your total.
What affects extensions cost in Plymouth
Heavy post-war rebuilding produced large areas of standardised 1950s housing. Coastal weather exposure makes render, roofing and window specification important.
- Drainage runs needing diversion
- Party wall agreements with neighbours
- Poor ground conditions requiring deeper foundations
Rules in Plymouth
Building control and planning applications for extensions work in Plymouth go through Plymouth City Council. Confirm before booking whether your property sits in a conservation area, is listed, or is covered by an Article 4 direction — each removes permitted development rights and changes the approval route.
Serving PL1, PL2, PL4, PL6 and the surrounding Devon area.
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