Velux Loft Conversion Cost UK 2026

A Velux (rooflight) loft conversion is the cheapest way to convert a UK loft because the roof shape stays the same — you simply insulate, board, light and floor the existing space, then add 2–4 Velux windows. Costs in 2026 sit at £30,000–£55,000 for a typical 25 m² loft.

Quick answer

Typical UK price range: £30,000–£60,000. Typical time: 4–6 weeks.

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Loft conversion calculator

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Loft conversion type Velux / rooflight Dormer Hip-to-gable Mansard L-shaped

Loft floor area (m²)

Region London South East South West Midlands North of England Scotland Wales Northern Ireland

Specification level Basic / standard Mid-range Premium / high-end

Extras

En-suite bathroom £8,000–£12,000 Extra Velux windows £1,500–£1,500 Underfloor heating £2,500–£4,500 New staircase £1,800–£3,500 Walk-in wardrobe £1,500–£3,500

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Budget Under £5,000 £5,000 – £15,000 £15,000 – £30,000 £30,000 – £60,000 £60,000+ Not sure

Timeline As soon as possible 1 – 3 months 3 – 6 months 6+ months Just researching

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Key points

• Cheapest type of loft conversion at £1,300–£1,800 per m²
• Permitted development for nearly all UK semis and terraces (no planning permission)
• Needs at least 2.3 m existing ridge height for usable space
• Each Velux window adds £900–£1,800 fitted

Cost breakdown

Item	Low	High
Structural works (joists, trimmers)	£4,500	£9,000
Insulation, plasterboard, plastering	£3,500	£6,000
Velux windows (3 typical)	£2,700	£5,400
Staircase + flooring	£3,500	£6,000
Electrics + radiators	£2,000	£4,000
Architect + building control	£2,500	£4,500

Cost by UK region

Region	Typical cost
London	£60,750
South East	£56,250
South West	£49,500
Midlands	£45,000
North England	£40,500
Scotland	£42,750
Wales	£40,500

How to save money

• Order Velux windows direct from a builders merchant — saves 10–20 %
• Use the existing landing for the staircase to avoid restructuring downstairs
• Choose centre-pivot Velux for cleaning access from inside

How to find a trusted tradesperson

Get at least 3 quotes from vetted UK trade networks:

• Checkatrade
• MyBuilder
• Bark

FAQs

How tall does the loft need to be for Velux?

You need at least 2.3 m at the ridge for a usable Velux conversion. Less than 2.2 m typically means a dormer.

Do I need planning permission for Velux loft?

No — Velux conversions are permitted development for nearly all UK houses, as long as the windows project less than 150 mm beyond the roof plane.

How long does a Velux loft take?

Typically 4–6 weeks on site, plus 6–8 weeks beforehand for design and building control.

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Disclaimer: Prices are guide ranges based on 2026 UK market data. Get quotes from local tradespeople for accurate pricing.