Yorkshire and the Humber cost guide

Extension costs in Yorkshire (2026): prices by area

Updated October 2026Prices include VAT and fees

Quick answerA 20m² single storey rear extension in Yorkshire typically costs £50,500 to £60,500 including VAT. Harrogate and York price highest, Hull and Doncaster lowest. Stone matching in West and North Yorkshire is one of the biggest reasons two similar projects end up with different quotes.

Typical prices in Yorkshire and the Humber

Yorkshire and the Humber Yorkshire and the Humber, Yorkshire and the Humberindex 0.96

Single storey rear extension20 m² (5m × 4m)£50,500 to £60,500£2,750/m²
Kitchen extension with bifolds24 m² (6m × 4m), mid spec£67,500 to £81,000£3,060/m²
Double storey rear extension40 m² over two floors£81,500 to £97,500£2,210/m²
Dormer loft conversion2 bedrooms + en-suite£45,500 to £55,500
Velux loft conversion2 rooms£32,500 to £40,000
Garage conversion15 m² single garage£18,500 to £22,500£1,350/m²

All prices include 20% VAT, professional fees and statutory planning fees. Kitchen extension includes a mid-range kitchen, bifolds and a roof lantern.

Price my exact project

Building in Yorkshire and the Humber

Yorkshire mixes cities, mill towns and some of the most protected countryside in England. Leeds and York have strong, busy markets, Harrogate is one of the dearest places in the North to build, and Hull, Doncaster and Bradford are among the most affordable. Much of West and North Yorkshire is built in local sandstone and gritstone, which shapes what councils expect an extension to look like.

What moves the price in Yorkshire and the Humber

Yorkshire stone

In the Pennine towns, the Dales and much of Leeds and Bradford, houses are stone-built. Extensions often need natural or reclaimed stone to match, which is slower and costlier than brick. Ask for a stone option and a render or brick option so you can compare.

Hills and slopes

Sheffield, Halifax, Huddersfield and the valleys are hilly, and sloping gardens mean retaining walls, stepped foundations and more excavation. A level-looking plan can hide a significant groundwork cost on a steep site.

City demand

Leeds, York and Harrogate have high demand from families who would rather extend than move, so good builders are booked ahead. Hull and South Yorkshire have more capacity, which keeps prices lower.

Planning and building control in Yorkshire

English permitted development rules apply, so many single storey rear extensions and loft conversions can go ahead without a planning application. The Yorkshire Dales and North York Moors national parks, York's historic core and many conservation areas in stone towns restrict those rights. Building Regulations approval is always needed. Check with your council or national park authority before finalising plans.

Prices across Yorkshire and the Humber

A 20m² single storey rear extension and a two-bedroom dormer loft with an en-suite, priced for each example postcode. All figures include VAT and fees.

Postcode	Area	Single storey, 20m²	Dormer loft	Index
LS6	Leeds	£51,500 to £62,000	£46,500 to £56,500	0.98
S10	Sheffield	£49,500 to £59,500	£44,500 to £54,500	0.94
YO24	York	£52,000 to £62,500	£47,000 to £57,000	0.99

Cost index for every postcode area in Yorkshire and the Humber

Our index against the West Midlands base of 1.00. Higher means dearer. Enter a full postcode in the checker for district-level detail where we have it.

Area	Main town	Index
BD	Bradford	0.91
DN	Doncaster	0.90
HD	Huddersfield	0.93
HG	Harrogate	1.02
HU	Hull	0.89
HX	Halifax	0.92
LS	Leeds	0.98
S	Sheffield	0.94
WF	Wakefield	0.92
YO	York	0.99

Yorkshire and the Humber: common questions

How much does an extension cost in Leeds?

A 20m² single storey rear extension in Leeds typically costs about £50,500 to £60,500 including VAT, around £2,750 per square metre. North Leeds suburbs such as Alwoodley and Roundhay usually price higher than the city average.

Is it more expensive to extend a stone house?

Usually, yes. Matching natural stone takes more time and the material costs more. Some councils accept a render or a contrasting modern finish on rear extensions, which can save money, but check before you assume.

How much is a loft conversion in Sheffield?

A dormer loft conversion with two bedrooms and an en-suite typically costs £45,500 to £55,500 including VAT in Yorkshire. A two-room Velux conversion is usually around £32,500 to £40,000.

How much does a garage conversion cost in Yorkshire?

Converting a 15m² single garage typically costs £18,500 to £22,500 including VAT. Most need Building Regulations approval but not planning permission, unless your estate's planning conditions remove permitted development rights.