Kitchen Extension Cost in Derby: 2026 Price Guide
30 Jul 2026
Derby holds a genuine claim to industrial history most cities can't match - Lombe's Silk Mill, built in 1721 on the River Derwent, is regarded as one of the world's first factories, and the Derwent Valley Mills that followed are now a UNESCO World Heritage Site. That early industrial growth, followed by railway engineering and more recently Rolls-Royce's aerospace operations, shaped a city with genuinely varied housing by era.
| Extension size | Typical cost | Notes |
|---|---|---|
| Small (up to 15m²) | £16,500-£29,000 | Common on Normanton/Pear Tree terraces |
| Medium (15-25m²) | £29,000-£46,000 | Typical rear extension |
| Large (25m²+) | £46,000+ | More common in Allestree/Mickleover |
Why quotes vary so much across the city
Normanton and Pear Tree, built up around Derby's railway works and later manufacturing, have dense Victorian terraces with the usual narrow-plot, limited-access challenges. Allestree and Mickleover, developed later as more suburban districts, generally have larger plots and easier access - a genuinely different starting point for the same extension brief.
Properties within or close to the Derwent Valley Mills UNESCO World Heritage Site buffer zone occasionally face additional heritage considerations beyond standard conservation area rules - worth checking specifically if your property is near the river corridor.
What's actually driving the price
- Access. Normanton and Pear Tree terraces without a side gate mean materials and spoil go through the house.
- Foundations. Victorian terraces built for the railway and manufacturing workforce typically sit on shallower footings than current standards require.
- Heritage proximity. Properties near the Derwent Valley Mills World Heritage corridor can face additional scrutiny beyond standard planning rules.
Frequently asked
Do I need planning permission for a rear extension in Derby? Often not if it stays within permitted development limits, though conservation area and World Heritage Site buffer zone status near the Derwent corridor can restrict this further. Check with Derby City Council's planning portal first.
How long does a typical Derby kitchen extension take? Around 9-12 weeks for a medium single-storey extension, longer for terraced properties without side access.
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