BATH HOUSE EXTENSIONS.
SINGLE, DOUBLE-STOREY,
WRAPAROUND.
Single-storey, double-storey, side-return, and wraparound house extensions across Bath, Bath BA1, Bath BA2, and the surrounding villages. Full project management from planning to plaster. MCIOB chartered, £10M+ insured.
Bath house extensions — from planning to plaster
We build house extensions across Bath, Bath BA1, Bath BA2, and the surrounding villages — Bathampton, Batheaston, Widcombe, Oldfield Park, Twerton, Weston, Lansdown, Combe Down, Bathwick, Bear Flat, and beyond. Every project is run by James with the same trusted team of CSCS cardholders on site.
- Single-storey rear extensions
- Double-storey side extensions
- Side-return extensions for terraced Bath homes
- Wraparound extensions combining rear and side
- Kitchen extensions with open-plan living
- Conservatory and orangery builds
- Garden rooms and outbuildings
- Two-storey extensions with structural steel
5.0 / 5 on Google
4 verified Google reviews. Every one is a real customer, on a real project, in Bath.
“Aspect builders are a very professional, personable team. We used them to create our vegetable garden and had significant kitchen structural work carried out. Both projects were completed to an excellent standard. Highly recommend.”
“The team has done a lot of work for us including designing and fitting a new kitchen and putting in a new bathroom. They are extremely helpful, very tidy and the work is to a very high standard. We would not hesitate to recommend them.”
“Long-term client — multiple bathroom, kitchen and full-house projects completed to a very high standard. James and the team are reliable, professional, and we recommend them without hesitation.”
Extension builders across Bath & BANES
Based in Dunkerton, we work across the 13 postcodes below — typically within a 10-mile radius of central Bath. Every postcode in Bath BA1, Bath BA2, Bath BA3, Bath BA11, and Bath BA15 is covered.
Bath's most-reviewed builder
4 verified 5-star Google reviews. 16 verified TrustATrader reviews. 200+ completed projects across Bath and BANES since 2004. £10M+ public liability. MCIOB-led. CSCS-credentialed. Fixed-price contracts. One project manager from start to finish.
- MCIOB Chartered — less than 5% of UK builders hold this
- £10M+ public liability and AXA-verified
- In-house team, no sub-contracting
- Bath heritage expertise — listed buildings, Bath stone, lime mortar
- CSCS cardholders, gas-safe, NICEIC registered
- 22+ years building in Bath
Frequently Asked Questions
How much does a house extension cost in Bath?
Costs vary widely depending on size, finish level, structural work, and site conditions. We give you a fixed-price quote after a free site visit, so you know the exact cost before any work starts. No day rates, no open-ended estimates.
How long does a house extension take in Bath?
Single-storey rear extensions: 10-14 weeks. Double-storey: 16-24 weeks. Wraparound extensions: 20-28 weeks. We provide a detailed programme at quote stage and stick to it.
Do I need planning permission for an extension in Bath?
Most rear extensions under 4m (or 3m on semi-detached) fall under Permitted Development. Bath's conservation area and Article 4 directions affect many properties. We check and handle the full application if needed — typically 8 weeks lead time.
Can you do side-return extensions in Bath?
Yes — side-return extensions are a core part of our work in Bath's terraced housing stock. We work on Victorian and Georgian terraces across Widcombe, Oldfield Park, Bear Flat, Larkhall, and Bathwick. Typical 4-6m dig-out, kitchen extension, full structural work.
Can you do double-storey extensions in Bath?
Yes — double-storey extensions are common in Bath. We handle the structural steel (RSJ), foundations, brickwork, roofing, and all internal fit-out. Typical project takes 16-24 weeks.
Will I be able to live in my home during the extension build?
We isolate work areas, dust-sheet, clean daily, and respect your space. For larger projects, we can phase the work so you only have one room out of action at a time. Most Bath extension projects are in occupied homes.
Are you insured and qualified to do extension work in Bath?
£10M+ public liability (AXA-verified). CSCS cardholders, City & Guilds / NVQ qualified. James is MCIOB chartered through the Chartered Institute of Building. All documentation on request.
Can you match the existing Bath stone on my extension?
Yes — heritage Bath stone matching is a core part of our work. We source Bath stone from the same quarries used historically, and our brickwork matches existing mortar profiles, pointing styles, and stone coursing. Conservation-officer liaison included for listed properties.
Ready to plan your Bath extension?
Book a free site visit with James. No obligation, no charge. Walk through your Bath home, discuss your extension, get a fixed-price quote within a week.
Get a Free Site Visit