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.
Below you'll find a full price breakdown for every conversion type. We give you a free estimate up front, and once we've surveyed your property, you get a fixed-price quote with no hidden costs.
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Price Guide by Conversion Type
The cost of your loft conversion depends mainly on the type you choose, from a simple Velux at the lower end to a full mansard at the top. The table below sets out the starting price, typical range and build time for each option. As a result, you can see at a glance which conversion fits your budget before you go any further.
| 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 → |
The figures above are UK averages and a useful starting point. In practice, London and South East properties tend to sit toward the upper end of each range, since labour and access costs run higher. For an exact figure, book a free survey and we'll turn it into a fixed-price quote.
Detailed Price Guides
Each conversion type has its own detailed cost guide, broken down by what drives the price. For example, you'll find what's included, what pushes the figure up or down, and how long the work usually takes. Pick the option closest to your plans and read the full breakdown before you decide.
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.
Get an Exact Price for Your Property
Every property is different, so the only way to know your real cost is to look. Book a free survey and we'll give you a fixed-price quote — no hidden costs, no obligation.