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House extension cost in Liverpool (2026)
Most single-storey extensions in Liverpool cost around £2,000–£2,650 per m² to build with a standard finish. Here is what that means for your extension, and a real Merseyside estimate to compare against.
Extension cost per m² in Liverpool
Typical 2026 build costs per m² of new internal floor area in Liverpool and Merseyside, before VAT, for a finished shell with standard finishes. These are our UK rates adjusted for the North of England.
| Extension | Cost per m² | 20 m² example |
|---|---|---|
| Single-storey, basic finish | £1,650–£2,000 | £33,000–£40,500 |
| Single-storey, standard finish | £2,000–£2,650 | £40,500–£53,500 |
| Single-storey, high finish | £2,650–£3,200 | £53,500–£64,500 |
| Double-storey, standard finish | £1,650–£2,500 | Per m² of both floors |
Add 10–15% contingency, more on older terraces where the drains and foundations are unknown. Want a figure for your own size and spec? Use the extension cost calculator and pick “North of England” as the region.
A real Merseyside extension, priced
Our sample estimate is for a 16.28 m² single-storey rear extension in Merseyside, priced at Q4 2026 rates. It came to £46,451 before VAT, or £2,853 per m². That is above the standard range in the table because it is a small extension: scaffolding, foundations, steelwork and the connection to the house cost much the same whatever the size, so the rate per m² goes up as the floor area goes down.
What affects the price in Liverpool
- Older terraces. Much of Liverpool's housing is Victorian and Edwardian terraced stock, where shallow footings, shared drains and party walls add cost.
- Access. No side access means materials and spoil go through the house by hand, which adds labour.
- Opening up. Knocking through the back wall needs steel beams, padstones and temporary support.
- Glazing. Large bifolds and roof lanterns can cost more than the walls they replace.
- Party walls. Building on or near a shared boundary usually needs a party wall agreement with each neighbour.
Common questions
How much does an extension cost in Liverpool in 2026?
Using our North of England rates, a single-storey extension with a standard finish typically costs around £2,000 to £2,650 per m² before VAT. A 20 m² rear extension comes to roughly £40,500 to £53,500, plus 10 to 15% contingency.
Are extensions cheaper in Liverpool than the rest of the UK?
A little. Build costs in the North of England usually run slightly below the Midlands and well below London and the South East. Small extensions still cost more per m², wherever you are.
How much is building control for an extension in Liverpool?
Liverpool City Council sets its own building regulation fees, which depend on the size of the extension. Check the current fee schedule on the council website before you budget.
Do I need planning permission for an extension in Liverpool?
Many single-storey rear extensions are permitted development: up to 3m deep on a terraced or semi-detached house, or 4m on a detached house. Check with Liverpool City Council before relying on this, especially in a conservation area.
Pricing an extension in Liverpool?
We are based in Liverpool. Send us the drawings and we measure every item, price it at current North West rates and send back an itemised estimate. From £150, in 3–5 working days.