Loft Conversion Cost Calculator UK
Get an indicative cost range for your loft conversion project. Choose the conversion type, size, specification and location for a UK market estimate.
Estimated Loft Conversion Cost
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to —
Indicative range. Not a quote. Includes a 10% contingency.
Cost Breakdown
| Structural Works | — |
| Staircase | — |
| Plumbing & Electrical | — |
| Admin & Permissions | — |
| Contingency (10%) | — |
| Estimated Total | — |
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How We Estimate
- • Estimates assume a standard UK semi-detached or terraced property. Flats and end-terrace properties may have different structural requirements.
- • Prices include design, structural engineer, building control and all trades.
- • Loft conversions typically require Building Regulations approval even under Permitted Development.
- • This is an indicative estimate, not a quote.
- • Last updated: Q2 2026.