Loft Conversion Prices
A loft conversion in the UK costs between £15,000 and £60,000 depending on the type — Velux conversions start from £15,000, dormers from £25,000, and mansard conversions from £35,000.
Full price breakdowns for every conversion type are below. All quotes from Trusted Loft Conversions are fixed-price with no hidden costs.
FREE NO-OBLIGATION ESTIMATE
Get Your Free Estimate
Price Guide by Conversion Type
| Conversion Type | Starting From | Price Range | Typical Duration | |
|---|---|---|---|---|
| Loft Conversion | £15,000 | £15,000 – £60,000+ | 4–14 weeks | Full breakdown → |
| Dormer Loft Conversion | £25,000 | £25,000 – £45,000 | 6–10 weeks | Full breakdown → |
| Velux Loft Conversion | £15,000 | £15,000 – £25,000 | 4–6 weeks | Full breakdown → |
| Hip-to-Gable Conversion | £30,000 | £30,000 – £50,000 | 8–12 weeks | Full breakdown → |
| Mansard Loft Conversion | £35,000 | £35,000 – £60,000+ | 10–14 weeks | Full breakdown → |
| Loft Bedroom Conversion | £18,000 | £18,000 – £35,000 | 5–8 weeks | Full breakdown → |
| En-Suite Loft Conversion | £28,000 | £28,000 – £50,000 | 7–10 weeks | Full breakdown → |
Prices are UK averages. London and South East properties typically fall toward the upper end of each range. Get a free survey for an exact fixed-price quote.
Detailed Price Guides
Loft Conversion Cost
A loft conversion in the UK costs between £15,000 and £60,000 depending on the type — Velux conversions start from £15,000, dormers from £25,000, and mansard conversions from £35,000.
Dormer Loft Conversion Cost
A dormer loft conversion costs between £25,000 and £45,000 in the UK, making it the most popular type for terraced and semi-detached homes.
Velux Loft Conversion Cost
A Velux loft conversion costs between £15,000 and £25,000 in the UK — the most affordable option as it requires no structural changes to the roofline.
Hip-to-Gable Conversion Cost
A hip-to-gable loft conversion costs between £30,000 and £50,000 in the UK and is suited to semi-detached or detached homes with a hipped roof.
Mansard Loft Conversion Cost
A mansard loft conversion costs between £35,000 and £60,000+ in the UK — the most expensive type, but it delivers the largest usable floor space.
Loft Bedroom Conversion Cost
A loft bedroom conversion costs between £18,000 and £35,000 in the UK, including insulation, flooring, a staircase, and building regulations sign-off.
En-Suite Loft Conversion Cost
An en-suite loft conversion costs between £28,000 and £50,000 in the UK, combining a bedroom and private bathroom in the converted loft space.
Learn More
Read our guides
Get an Exact Price for Your Property
Every property is different. Get a free survey and fixed-price quote — no hidden costs, no obligation.