Cost of Single Storey Extension in Kettering (2026)
Single Storey Extension in Kettering works out at £1,710 to £3,040 per m² in 2025, give or take. Kettering runs a bit under the UK average, which mostly comes down to Northamptonshire labour rates and what the local housing stock demands. Straight like-for-like jobs hit the lower end; anything that needs pipework or structural changes pushes you up.
About single storey extension in Kettering
Kettering is a small town of around 63,000 in Northamptonshire. 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 NN15, NN16 tend to be quicker jobs with standardised fittings. Local trade prices sit in the same ballpark as the UK average, with Northamptonshire 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 Kettering
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 Kettering?
- Ground conditions and foundation depth
- Glazing ratio (bi-folds, roof lights)
- Kitchen refit included
- Structural steels and knock-through
- Planning permission vs PD
Kettering vs the UK average
Kettering sits in the building & construction market at a cost multiplier of 0.95× the UK national average. That puts Kettering 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 — Kettering
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 Kettering?
Budget £1,710 to £3,040 per m² for single storey extension in Kettering. Prices here are around 5% cheaper than the UK average. What moves a quote inside that range is mostly building contractor day rates in Northamptonshire and the specific material list for your job.
How long does single storey extension take in Kettering?
A straightforward single storey extension job in Kettering 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 Kettering?
A proper single storey extension quote in Kettering 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 Kettering than the UK average?
Single Storey Extension in Kettering runs around 5% cheaper than the UK average. The UK-wide benchmark for this job is £1,800 to £3,200 per m²; Kettering 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 Kettering?
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 Northamptonshire 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 Kettering.