Extensions cost in Swindon
2026 prices for Wiltshire · South West
Extensions in Swindon 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 · Swindon index 102
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Extensions prices in Swindon by finish level
| FINISH LEVEL | SWINDON 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 Swindon 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 Swindon
Railway-era terraces in the Old Town alongside extensive modern estates. M4 access keeps material delivery costs low and trade supply healthy.
- Drainage runs needing diversion
- Party wall agreements with neighbours
- Poor ground conditions requiring deeper foundations
Rules in Swindon
Building control and planning applications for extensions work in Swindon go through Swindon Borough 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 SN1, SN2, SN3, SN5 and the surrounding Wiltshire area.
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