How Much Does a 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.
All prices include a free feasibility survey, structural engineering, planning checks, building regulations submission, and the full build. Our quotes are fixed-price — no hidden costs.
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Loft Conversion Price Breakdown
Typical price range
£15,000 – £60,000+
Starting from
£15,000
Typical duration
4–14 weeks
A loft conversion transforms unused roof space into a fully liveable room. Whether you need an extra bedroom, a home office, or an en-suite suite, we handle every stage: feasibility survey, structural design, planning checks, building regulations, and the complete build. We advise on the best conversion type for your property and budget.
The price range above covers the full project — including your structural engineer, all building materials, labour, and building regulations sign-off. We provide fully itemised quotes so you know exactly what you are paying for.
What Affects the Cost?
Loft Size
Floor area and ridge height directly affect material and labour costs. Larger lofts cost more but add proportionally more value.
Roof Pitch
Steeper pitches provide more natural headroom and are generally cheaper to convert. Shallow pitches may require more structural work.
Structural Work
Some conversions require steel beams, new joists, or party wall agreements. These add cost but are included in our fixed-price quotes.
Specification
The quality of windows, insulation, flooring, and fixtures affects the final price. We offer a full range of specification levels.
Planning
Most conversions fall under Permitted Development. Conservation areas or Article 4 zones may need a planning application (typically £200–£500 in fees).
Location
London and South East properties typically fall at the upper end of price ranges due to higher labour costs.
Get an Exact Price
Every property is different. Get a free survey and fixed-price quote — written within 48 hours, fully itemised, no hidden costs.
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Available across London
Service details
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