Extensions cost in Portsmouth
2026 prices for Hampshire · South East
Extensions in Portsmouth typically costs between £33,500 and £134,500, with most homeowners landing near £84,000. Local pricing sits about 12% above the UK average. Strong demand and overspill from London keep day rates high, though materials and waste costs are close to the national average.
£33,500 – £134,500
UK average £2,200 per m² · Portsmouth index 112
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Extensions prices in Portsmouth by finish level
| FINISH LEVEL | PORTSMOUTH COST | WHAT'S INCLUDED |
|---|---|---|
| Budget | £33,500 – £50,500 | Entry-level materials, existing layout retained |
| Mid-range | £48,500 – £73,000 | Better fittings, some layout change |
| Premium | £65,500 – £98,500 | High-specification materials and full redesign |
£46,200
About 55% of a typical Portsmouth job, at South East day rates.
£37,800
Materials pricing is broadly national — this is where specification, not location, drives your total.
What affects extensions cost in Portsmouth
The most densely populated city outside London, largely Victorian terraces on Portsea Island. Restricted parking and access are a real cost factor on skip-heavy jobs.
- Drainage runs needing diversion
- Party wall agreements with neighbours
- Poor ground conditions requiring deeper foundations
Rules in Portsmouth
Building control and planning applications for extensions work in Portsmouth go through Portsmouth 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 PO1, PO2, PO4, PO5 and the surrounding Hampshire area.
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