Loft conversion cost calculator โ Wales 2026
Estimate the cost of converting your loft in Wales. Adjust by conversion type, size and fit-out level.
Estimate only. Figures shown are 2026 market estimates compiled from published merchant retail prices and public listings. Actual cost depends on your property, scope, location and supplier. Always request three written quotes from accredited Welsh tradespeople before committing.
Estimated cost range
ยฃ25,500 โ ยฃ38,000
Includes structural work, insulation, plastering, electrics, basic decoration. Excludes architect, structural engineer, and planning fees.
Indicative ranges only โ based on UK published loft-conversion cost data (HomeOwners Alliance, Federation of Master Builders) for 2025. Loft conversions typically need building regulations approval and a structural engineer's report. Always get 3 written quotes.
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Loft conversions need building regulations approval. Use a builder familiar with the local planning context.
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