How Much Does House Extension Cost?
A house extension can dramatically increase your living space and property value. Costs depend on the size, type of extension, and the level of finish required.
Typical UK Costs
Budget£25,000Basic specification
Average£50,000Mid-range finish
Premium£100,000High-end specification
Get Your Personalised Estimate
These are average UK costs. Get a more accurate estimate tailored to your specific project details and location.
Get a Personalised EstimateWhat Affects the Cost?
- Extension size (sq metres)
- Single or double storey
- Foundation requirements
- Roof type and finish
- Internal fit-out specification
Frequently Asked Questions
Do I need planning permission for an extension?
Small single-storey rear extensions often fall under Permitted Development. Larger extensions and side/front extensions typically need planning permission.
How much value does an extension add?
A well-designed extension can add 5-15% to your property value, often exceeding the cost of the build itself.