How Much Does a Loft Conversion Cost in the UK?
A loft conversion is one of the most effective ways to create extra living space without moving home. Whether you’re adding a bedroom, office, or en-suite master suite, converting your attic can significantly increase both your property’s functionality and value. However, costs can vary widely depending on the type of conversion, your location, and the level of finish you choose.
Average Loft Conversion Costs
In 2025–2026, most loft conversions in the UK typically cost between £50,000 and £90,000. Simpler projects such as rooflight or Velux conversions sit at the lower end of the scale, while larger dormer, mansard, or hip-to-gable conversions can cost substantially more. Homes in London and surrounding areas generally attract higher labour and material costs, often increasing budgets by 20–25%.
Types of Loft Conversions
Rooflight (Velux) Conversion
This is the most affordable option because it keeps the existing roof structure largely unchanged. Roof windows are added to bring in light, making it ideal for lofts with enough existing headroom. Costs usually start from around £30,000–£45,000 depending on size and specification.
Dormer Conversion
Dormer lofts are among the most popular choices in the UK. They extend vertically from the roof slope to create additional floor space and headroom. A standard dormer conversion commonly ranges from £50,000–£75,000+.
Hip-to-Gable Conversion
Suitable for semi-detached and detached properties, this design extends the sloping side roof to form a vertical wall. It creates more usable space but requires more structural work, increasing costs. Budgets often fall between £65,000 and £90,000.
Mansard Conversion
Mansard conversions are typically the most expensive because they involve major structural changes and usually require planning permission. However, they also create the largest amount of living space. Costs can exceed £80,000–£100,000 depending on complexity and location.
What Affects the Cost?
Several factors influence the final price of a loft conversion:
The size and shape of your roof
Structural work required
Plumbing and electrical installations
Staircase design and positioning
Insulation and building regulations
Interior finishes and fittings
Your geographic location
Unexpected structural issues or low roof heights can also add to the budget. Some homeowners may need steel reinforcements or lowered ceilings to achieve compliant headroom.
Planning Permission and Regulations
Many loft conversions fall under permitted development rights, meaning formal planning permission may not be necessary. However, building regulations approval is always required to ensure the new space is safe and structurally sound. Fire safety, insulation, stair access, and floor strength are all important considerations.
Is a Loft Conversion Worth It?
For many homeowners, the answer is yes. A well-designed loft conversion can add valuable square footage and may increase property value by up to 20–25% in some areas. It can also be more cost-effective than moving house, especially in high-demand property markets.
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Luxuria offers a true end-to-end service, from planning and design through to build and finish, supported by in-house project control, clear communication and transparent pricing. As TrustMark approved, Federation of Master Builders members and Checkatrade vetted contractors, we provide independent assurance as well as outstanding results.
Put simply, clients trust Luxuria Property - Premium Building Contractors to deliver beautifully finished homes, with minimal stress and maximum confidence.
If you’re dreaming of transforming your property in 2026, the Luxuria team would love to help bring your vision to life.
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