How Much Does a 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.
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 Bedroom Conversion Price Breakdown
Typical price range
£18,000 – £35,000
Starting from
£18,000
Typical duration
5–8 weeks
A loft bedroom conversion transforms unused roof space into a fully functional bedroom, complete with proper insulation, a Velux or dormer window for natural light, and a compliant staircase. It is one of the most cost-effective ways to add a bedroom to a property.
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.
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Available across London
Service details
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