7 Best Builders in Swansea for 2026

🏗️ 7 businesses · 📍 Swansea
✓ Verified Google reviews · ✓ Reviewed regularly · ✓ Updated 23 May 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 23 May 2026
Swansea's mix of Victorian terraces, Edwardian bay-fronted houses, and post-war developments creates unique challenges for builders. The city's coastal location means dealing with salt air corrosion, while the hilly terrain around areas like Sketty and Mount Pleasant requires careful foundation work. Many properties in Uplands and Brynmill need specialist knowledge of original lime mortar and period features.

The builders featured here have been selected based on verified Google reviews, active trading status, and local reputation. We've checked their ratings over time, looked at review patterns to spot genuine feedback, and confirmed they hold relevant insurance and certifications. Each has demonstrated experience with Swansea's particular building challenges, from damp-proofing in seafront properties to working with the local planning department.

Before choosing any builder, ask to see recent work in your area and get at least three detailed quotes. Check they're registered for VAT if the job's over £1,000, and that they carry public liability insurance of at least £2 million. Don't pay large sums upfront, and make sure any planning permissions or building regulations approvals are in place before work starts.
How We Select & Rate The Best Builders in Swansea

Our selection process analyses Google ratings and review volume over extended periods, looking for consistent quality indicators rather than just high scores. We verify active trading status through official records and check relevant certifications where applicable. Each business is assessed on review authenticity, response to customer concerns, and local reputation. This isn't a paid directory or endorsement, so readers should still conduct their own research and obtain multiple quotes before making decisions.

Quick Comparison — Builders in Swansea

# Business Rating Reviews Phone
1 Crocker's Building limited Recommended ⭐ 5.0 18 +44 7876 235244 View →
2 JM Building Contractors Featured ⭐ 4.8 20 +44 1792 201448 View →
3 Bardic Construction Limited Featured ⭐ 5.0 16 +44 1792 872519 View →
4 No Limit Construction ltd Featured ⭐ 5.0 14 +44 7895 841555 View →
5 Herms Construction Featured ⭐ 5.0 12 +44 7949 498049 View →
6 Andrew Scott Ltd - Head Office ⭐ 4.6 17 +44 1639 889800 View →
7 LL Carpentry (swansea) Ltd ⭐ 5.0 3 +44 7854 265175 View →

Our Top Picks

6
Andrew Scott Ltd - Head Office
4.6 (17 reviews)

Andrew Scott Ltd operates from their head office in Llansamlet, providing building services across the Swansea area. The company has earned a strong reputation with customers, maintaining a 4.6 out of 5 star rating based on 17 verified Google reviews. Based at Scott House on Enterprise Park, they offer comprehensive building solutions for residential and commercial projects throughout South Wales.

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7
LL Carpentry (swansea) Ltd
5.0 (3 reviews)

LL Carpentry (Swansea) Ltd provides professional building services throughout the Swansea area, specialising in carpentry and construction work. The company maintains a perfect 5-star rating from 3 verified customer reviews on Google, reflecting their commitment to quality workmanship and customer satisfaction.

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Transparency notice: Recommended (#1) and Featured (positions 2-5) listings may be paid placements. All other rankings are determined by a combined score drawn from Google ratings, review counts, and reputation signals gathered from multiple independent online sources. How we verify →

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Frequently Asked Questions

How much does a builder cost in Swansea?
Daily rates for skilled builders range from £180-280, depending on experience and job complexity. Small jobs like partition walls might cost £800-1,500, while single-storey extensions typically run £15,000-25,000. Two-storey extensions can reach £30,000-50,000 or more. Costs vary based on materials, access difficulties, and planning requirements. Always get two or three detailed quotes to compare like-for-like pricing.
Do I need planning permission for building work in Swansea?
Most extensions, loft conversions, and structural changes need planning permission from Swansea Council. Some small works fall under permitted development rights, but it's worth checking first. Conservation areas like Mumbles and parts of Uplands have stricter rules. Your builder should advise on requirements, but the final responsibility lies with you as the homeowner.
How long do typical building projects take in Swansea?
Small renovations take 1-3 weeks, single-storey extensions 6-10 weeks, and two-storey extensions 10-16 weeks. Weather delays are common, especially in winter months. Planning permission adds 8-12 weeks before work starts. Factor in potential delays for materials delivery, especially to hillier areas where access is tricky.
What building regulations apply in Swansea?
All structural work, electrical installations, plumbing, and insulation improvements need building regulations approval. Applications go through Swansea Council's building control team, who inspect work at key stages. Your builder should handle applications and arrange inspections, but check this is included in their quote as fees range from £200-800 depending on project size.
Should I use local Swansea builders or consider firms from further away?
Local builders understand Swansea's building styles, planning quirks, and material suppliers. They're also easier to hold accountable if problems arise. Firms from Cardiff or Newport might quote lower but add travel costs and won't know local building control officers. For major projects, local knowledge of ground conditions and typical property issues proves invaluable.
How can I verify a builder's credentials before hiring?
Check they're registered with a trade body like the Federation of Master Builders or NHBC. Ask for recent references and actually contact previous customers. Verify their business registration and VAT number online. Confirm they hold valid public liability insurance by asking to see the certificate. Visit ongoing or recently completed jobs in your area if possible.