Extension Cost in Midlands (2026)
A extension in Midlands typically costs between £32,000 and £48,000 - broadly in line with the UK average. Labour rates and demand in the region are close to the national average.
£32,000–£48,000
Typical range
£40,000
Average cost
Average
vs national avg
10–16 weeks
Typical duration
Free, no obligation. Quotes from vetted tradespeople in Midlands.
Important: Building Regulations approval is required for all house extensions. Most single-storey rear extensions up to 6m (detached) or 3m (semi/terrace) fall under Permitted Development, but you should always check with your local council before starting work.
Midlands extension prices
Prices below reflect the typical cost of an extension in Midlands, including materials and labour.
| Type | Details | Midlands range | Midlands avg |
|---|---|---|---|
| Single-storey rear | 3m x 4m basic build, plastered and decorated | £32,000 – £48,000 | £40,000 |
| Single-storey side | Infill or wraparound, converting dead space | £28,800 – £43,200 | £36,000 |
| Double-storey rear | Two floors, extra bedroom and living space | £56,000 – £84,000 | £70,000 |
All prices include materials and labour. Based on contractor submissions and market data, April 2026.
What affects extension costs in Midlands
Extension costs are heavily influenced by local build rates - the cost per square metre for structural work. In Midlands, builders typically charge £40–£55 per hour for general construction labour, which affects the per-square-metre rate for your build.
The Midlands - including Birmingham, Coventry, Nottingham, and Leicester - has a wide range of property types. Victorian terraces, 1930s semis, and post-war estates are all common. Prices broadly reflect the national average. The type of property you are extending matters. A straightforward rear extension on a detached house is simpler than extending a mid-terrace or a property on a slope.
Foundation costs can vary significantly. Ground conditions across the Midlands vary, but clay soils are common in many areas.
Planning and Building Regulations fees are set nationally, but if your extension requires full planning permission rather than falling under Permitted Development, the design and application process adds time and cost.
How Midlands compares
Midlands extension costs compared to other UK regions and the national average.
| Region | Average cost | vs national avg |
|---|---|---|
| East of England | £42,600 | +7% |
| South West | £41,600 | +4% |
| MidlandsYou are here | £40,000 | Average |
| National average | £40,000 | - |
| Yorkshire | £37,400 | -6% |
| North West | £37,400 | -6% |
How to get your extension for less in Midlands
Use Permitted Development rights
If your extension qualifies under Permitted Development, you skip the full planning application - saving £200 to £500 in fees and potentially months of waiting. Check with your local council before assuming you need planning permission.
Get a fixed-price contract
Extensions are complex and costs can escalate. Insist on a fixed-price contract from your Midlands builder that covers all structural work, roofing, plastering, electrics, and plumbing. Vague quotes lead to expensive surprises.
Build during quieter months
Builders in Midlands are typically busiest from April to September. Starting your build in autumn or winter can sometimes get you a better price, though weather delays are more likely.
Frequently asked questions
How much does a house extension cost in Midlands?
Do I need planning permission for an extension in Midlands?
How long does it take to build an extension in Midlands?
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