Kitchen Extension Cost in Southampton: 2026 Price Guide
30 Jul 2026
Southampton's status as a major passenger and cargo port for over a century shaped its housing in a specific way - dense Victorian and Edwardian terraces in Shirley, Freemantle and Portswood were built for dockworkers and their families, while Bassett, Highfield and Chilworth further out have larger, later detached and semi-detached houses. A kitchen extension looks very different depending on which of these you're in.
| Extension size | Typical cost | Notes |
|---|---|---|
| Small (up to 15m²) | £18,000-£31,000 | Common on Shirley/Freemantle terraces |
| Medium (15-25m²) | £31,000-£49,000 | Typical rear extension |
| Large (25m²+) | £49,000+ | More common in Bassett/Highfield |
Why quotes vary so much across the city
Southampton was heavily bombed during WWII, given its importance as a port - so the terraces that survive in Shirley and Freemantle sit alongside pockets of post-war rebuilding, each with different foundation and construction standards. Further north, Bassett and Highfield developed later as more suburban, university-adjacent areas, with wider plots and easier access for building work.
The city's medieval walls - parts of which still survive around the Old Town, including the God's House Tower - mean any work close to the city centre can involve archaeological and heritage considerations that simply don't apply to a Bassett extension a few miles north.
What's actually driving the price
- Access. Terraces without a side gate, common across Shirley, Freemantle and Portswood, mean materials and spoil go through the house.
- Foundations. Surviving Victorian and Edwardian terraces sit on shallower footings than current Building Regulations require, while post-war rebuilt sections generally don't.
- Old Town heritage constraints. Properties near the medieval walls occasionally require an archaeological watching brief during groundworks - a genuinely unusual extra cost specific to this part of the city.
Frequently asked
Do I need planning permission for a rear extension in Southampton? Often not if it stays within permitted development limits, though heritage constraints near the Old Town walls can add extra steps. Check with Southampton City Council's planning portal first.
How long does a typical Southampton kitchen extension take? Around 9-13 weeks for a medium single-storey extension, longer for terraced properties without side access or work near the historic Old Town.
Ready to get quotes? Post your job on builderfinder.uk and hear from vetted, reviewed builders who cover Southampton - it's free, and your details stay private until you accept one.
Ready to get started?