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House extensions · Swindon & villages
House extensions in Swindon — a fixed price, a certificate, and a builder who turns up.
Single and double storey, rear and side. We take it from drawings to the Building Control completion certificate, under one written price.
- 5.0 ★ 49 Google reviews
- FMB No. 170197
- Luke Regan MCIOB
- £2m / £10m insured
What it costs
A straight answer on price
£2,500–£3,200 per m²
A typical 4 m × 5 m single-storey kitchen extension is 20 m², so roughly £50,000–£64,000 built and certified. Double storey usually £2,200–£2,800 per m². Kitchens, bathrooms and finishes are on top and priced to your choices.
What's included
- Site visit and a written fixed quote
- Planning and drawings — your architect or ours
- Building Control from notice to completion certificate
- Foundations, drainage and structure
- Roof, windows and doors
- First and second fix electrics and plumbing (our regular trades)
- Plastering and making good
- 10-year insurance-backed guarantee on projects over £30,000
How it works
Four steps, no surprises
Written fixed price
An itemised quote with the scope spelled out. The price only changes if you change the scope — in writing, before the work.
Drawings and approvals
We work with your architect or arrange plans, submit to Building Control and sort the engineer's calculations.
Build and sign-off
Our own team from footings to finish, inspected at every stage. You get the completion certificate at the end.
Real jobs
Before and after
Not the cheapest. Not a cowboy.
What you get from us that the horror stories never had
A written fixed price
Scope spelled out before we start. It only changes if you change it — in writing.
Building Control sign-off
Inspected and certified. The paperwork a buyer's solicitor will ask for.
You deal with Luke
Luke Regan MCIOB quotes it, manages it and answers the phone.
Insured and guaranteed
£2m / £10m cover you can see, and a written warranty on every job.
See it done
Watch an extension go up, start to finish
A full rear extension in Swindon, start to finish — groundworks, foundations, walls up, and the finished room.
House extension FAQs — Swindon
Common questions
How much does a house extension cost in Swindon?
As a guide, single-storey extensions typically range from £2,500–£3,200 per m² and double-storey from £2,200–£2,800 per m², depending on size, design and specification. Your project is priced in a clear fixed written quotation — the price we agree is the price you pay. See the full breakdown in our 2026 extension cost guide.
Do I need planning permission?
Many extensions fall under permitted development rights, meaning planning permission may not be required. Larger or more complex builds need approval — we guide you through the whole process.
How long does an extension take?
Most house extensions take between 8–16 weeks depending on size and complexity. We provide a clear timeline and manage the project from start to finish.
Do you manage the whole project?
Yes — from planning through to Building Control sign-off and handover, personally managed by our Chartered Director.
Straightforward to work with
How a SwiftBrick project works
1. Plans, or no plans yet
If you already have drawings, bring them — Luke will review them on site and quote against exactly what's drawn. No plans yet? No problem, and no charge to talk. Luke will visit, assess what's feasible, and tell you straight whether you need full planning or whether your project qualifies as Permitted Development — many extensions do, which saves both time and fees. If drawings are needed, he'll help you brief the architect so you end up with plans that are actually buildable.
2. Site assessment & detailed quote
Every quote follows a personal site visit and a thorough review of your plans. No vague estimates and no surprise extras — if there's a realistic possibility of additional cost, it's flagged upfront, not presented as a shock halfway through your build.
3. Professional build, personally managed
Every project is personally managed on site by a Chartered professional, supported by a hand-picked team of experienced tradespeople. You have a direct number. If something comes up, you hear it first.
4. Building Control sign-off & handover
The job isn't finished until Building Control has signed it off. You receive a full debrief, all documentation, and a 10-year insurance-backed guarantee.
Start your project
Ready to extend?
Send your plans or tell us what you're imagining — we'll review your project and come back with clear, professional advice within 24 hours.
Request a QuotePrefer to talk? 07460 232373 · luke@swiftbrick.co.uk