How much does a Builder cost in Swansea?
Typical costs for hiring a builder in Swansea, Wales. Builders pricing is largely consistent across the UK, so the figures below are indicative national ranges. Your actual quote depends on job size, access and materials, so always get 2–3 quotes. Ranges reflect published 2024–25 UK trade-pricing guides.
Quotes below reflect 36 verified local businesses, 19 with websites, median 9 years trading
Builder price guide, Swansea (2026)
Prices updated 2026-08-07. Actual quotes may vary by job complexity and contractor.
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Frequently asked questions
How much does a single-storey extension cost?
Typically £20,000–£50,000 depending on size, finish and groundworks. Get an FMB or TrustMark builder and a written spec.
How much does a loft conversion cost?
Usually £25,000–£60,000 for a dormer loft, including stairs, insulation and building control.
Do I need planning permission?
Many extensions fall under permitted development, but always check with your local Welsh council first.