Extension cost per m² in Leeds
Extension cost by size in Leeds
Each row multiplies the current £1,800–£3,000 per m² national benchmark by floor area and then applies the same Yorkshire factor.
What can change a real Leeds quote?
- Floor area and number of storeys
- London and regional labour rates
- Steelwork and structural changes
- Kitchen or bathroom installation
- Glazing and door specification
- Finish level, access and contingency
Local planning considerations
Use the regional figures to set a budget, then refine it with project size, condition and finish choices in the calculators.
- Site levels and access can change groundworks, retaining, landscaping and extension costs independently of the regional model.
- Traditional masonry or older property fabric may require specialist repair methods rather than a standard new-build allowance.
- Keep specification, professional fees and access costs visible when comparing a calculator result with local quotes.
How the regional model works
The 0.93× factor places this planning estimate 7% below the national planning baseline. We keep that modelling assumption separate from the dated national benchmark so users can see exactly which part comes from an external source and which part is UK Home Costs modelling.
Sources
House Extension: Cost Breakdown 2026
Published / checked: June 2026
Used for: Extension cost-per-m² benchmarks and common add-on costs
Construction output price indices
Published / checked: 13 August 2026
Used for: Construction price trend and update checks
Frequently asked questions
How much does a house extension cost in Leeds in 2026?
Our modelled Leeds planning rate is about £1,650–£2,800 / m², based on the current national £1,800–£3,000 per m² benchmark and the Yorkshire regional factor. This is not an observed city-wide quote average.
How much is a 20m² extension in Leeds?
Applying the same regional model to the current national benchmark gives about £33,500–£55,800 before VAT for a straight-line 20m² example. Structural work, glazing, kitchens, bathrooms and access can move a real quote outside that range.
Why is the Leeds estimate different from the UK benchmark?
UK Home Costs applies a 0.93× Yorkshire planning factor, which places the model 7% below the national planning baseline. The factor is our modelling assumption rather than an external city price index.
Does the extension figure include VAT and professional fees?
The national benchmark used here is stated before VAT. Do not assume architect, structural engineer, planning, building-control, party-wall or specialist survey fees are included unless a contractor quote says so explicitly.