Cost of Single Storey Extension in Derby (2026)
Expect to pay somewhere between £1,710 and £3,040 for single storey extension in Derby, per m². Derbyshire prices are noticeably below the UK average. Get at least three written quotes before committing — it's a 10 to 15 percent swing in either direction for not much effort.
About single storey extension in Derby
Derby is a large city of around 258,000 in Derbyshire. The housing is mostly a mix of Victorian terraces, inter-war semi-detached housing and modern new-build estates. That matters: older properties usually mean more pipework, rewiring and retrofit surprises, while newer builds in districts like DE1, DE22, DE23 tend to be quicker jobs with standardised fittings. Local trade prices sit in the same ballpark as the UK average, with Derbyshire firms quoting close to national rates.
East Midlands pricing sits a touch below the national average. Nottingham, Derby and Leicester are the higher end; smaller towns are noticeably cheaper. Plenty of Travis Perkins, Selco and Howdens branches across the region means parts rarely hold a job up.
Building jobs are labour-heavy, and materials have moved fast — brick, timber, steel, insulation and board are all 20 to 40 percent up on pre-2022. FMB and TrustMark are your best signposts for a proper builder. On anything bigger than a loft conversion, get a Building Control officer involved from day one; fixing non-compliance later costs a fortune.
Single Storey Extension cost breakdown in Derby
Simple rear extension with standard finish
Open-plan kitchen extension with bi-fold doors
Wrap-around or glazed extension with lantern roof and structural steels
What affects the price of single storey extension in Derby?
- Ground conditions and foundation depth
- Glazing ratio (bi-folds, roof lights)
- Kitchen refit included
- Structural steels and knock-through
- Planning permission vs PD
Derby vs the UK average
Derby sits in the building & construction market at a cost multiplier of 0.95× the UK national average. That puts Derby single storey extension prices at £1,710–£3,040 versus the UK average of £1,800–£3,200 per m².
Single Storey Extension cost calculator — Derby
Estimate based on live 2025 UK trade pricing. Always get 3 written quotes before committing.
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What's typically included in a single storey extension quote
- Foundations and drainage
- Brick and block shell
- Roof and glazing
- First and second fix
- Plaster and decoration
Frequently asked questions
How much does single storey extension cost in Derby?
Budget £1,710 to £3,040 per m² for single storey extension in Derby. Prices here are around 5% cheaper than the UK average. What moves a quote inside that range is mostly building contractor day rates in Derbyshire and the specific material list for your job.
How long does single storey extension take in Derby?
A straightforward single storey extension job in Derby runs to 10–16 weeks. You can lose days to things outside the contractor's control — parts on backorder, awkward access, or a firm slotting your job around existing bookings. Ask for a start date and expected finish up front.
What's included in the price of single storey extension in Derby?
A proper single storey extension quote in Derby should cover: Foundations and drainage; Brick and block shell; Roof and glazing; First and second fix; Plaster and decoration. If any of those aren't itemised on your quote, push back and ask. A written guarantee with a clear warranty period is reasonable to expect on this kind of work.
Is single storey extension cheaper in Derby than the UK average?
Single Storey Extension in Derby runs around 5% cheaper than the UK average. The UK-wide benchmark for this job is £1,800 to £3,200 per m²; Derby quotes tend to land between £1,710 and £3,040. Handy to know what the average actually looks like before you price round.
Do I need planning permission for single storey extension in Derby?
Most rear extensions fall under Permitted Development (up to 6m terraced/8m detached with Prior Approval). Side extensions and Article 4 areas require full planning. If the property sits in a conservation area or is listed, ring Derbyshire Council before you book anything in. It's a free call and saves a world of grief later.
See all single storey extension prices across the UK or browse all tradespeople costs in Derby.