Cost of Loft Conversion
across the UK

How much does loft conversion cost in the UK?

Loft conversions typically cost between £15,000 and £50,000 depending on complexity. Factors include property size, structural work required, building regulations compliance, and finishing standards. Basic conversions start around £15,000, whilst premium conversions with ensuite bathrooms can exceed £50,000. Obtain multiple quotes from local specialists for accurate pricing.

What affects the cost of loft conversion?

Key cost factors include roof type and condition, floor joists requiring reinforcement, structural beams or columns needed, building regulations and planning permission complexity, and internal finish specifications. Chimney removal, dormer windows, and ensuite bathrooms significantly increase costs. Access for materials and site conditions also impact pricing substantially.

What does a loft conversion service actually include?

Services include structural survey and design, building regulations approval and inspections, roof reinforcement or modification, flooring installation, insulation and ventilation, electrics and plumbing installation, staircase construction, plastering and decoration, and final certification. Most providers handle project management, obtaining permits, and coordinating specialist contractors throughout.

What's the difference between a Velux loft conversion and a dormer conversion?

Velux conversions use roof windows, preserve existing roof shape, and cost £15,000-£25,000 with minimal planning requirements. Dormer conversions extend the roof vertically, provide more space and headroom, but cost £25,000-£50,000 and typically require planning permission. Dormers suit larger properties needing additional usable space.

What should I check before hiring a loft conversion provider?

Verify FENSA or building control certification, check FMB (Federation of Master Builders) or NHBC membership, confirm they hold appropriate insurance and guarantees. Request references from previous conversions, review structural engineer qualifications, and ensure they're registered for VAT. Ask about timescales, project managers, and warranty provisions.

How long does a loft conversion typically take?

Standard loft conversions take eight to twelve weeks from start to completion. Timescales depend on structural complexity, building regulations inspections required, and concurrent work on other areas. Dormer conversions and those requiring planning permission may extend to four months. Expect delays during inspections and weather-dependent roof work.

Do I need a certified professional for loft conversion work?

Yes, loft conversions require certified structural engineers, building control inspectors, and electricians registered with relevant bodies. Electrical work must be completed by Part P certified electricians. Structural modifications require qualified engineer sign-off. Building regulations approval is mandatory in England, Scotland, Wales, and Northern Ireland for all conversions.