Loft Conversions in London – Create More Space, Add More Value
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Looking to add extra space and increase the value of your property? At Bigness Group, we are a trusted loft conversion company in London, helping homeowners transform unused roof space into modern, functional living areas. Whether you’re looking for a small loft conversion, a cost-effective upgrade, or a luxury build, we deliver tailored solutions across East, North, and South London.
Types of Loft Conversions We Offer
Dormer Loft Conversions
A popular choice for adding headroom and natural light. Perfect for bedrooms, offices, or en-suites.
Mansard Loft Conversions
Maximise your roof space with a stylish, full-width extension. Ideal for homeowners who want a big transformation.
Hip-to-Gable Conversions
Turn unused roof slopes into functional rooms, giving you a spacious new living area.
Velux (Rooflight) Conversions
Cost-effective and quick, Velux loft conversions are ideal if you want natural light without changing your roof structure.
Loft Conversion Costs in London
The cost of a loft conversion in London varies depending on size, design, and finish:
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Small loft conversion London – from £25,000
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Standard dormer conversion – from £35,000
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Mansard conversion – from £45,000+
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Custom projects – priced individually
👉 We offer transparent pricing with no hidden costs, and can provide a free, tailored quote for your property.
The Loft Conversion Process
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Free Consultation – We assess your property and needs.
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Design & Planning – Our architects prepare designs and handle permissions.
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Construction – Our skilled builders deliver your loft conversion on time.
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Finishing Touches – From flooring to lighting, we complete your dream space.
Why Choose Bigness Group?
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✅ Experienced loft conversion specialists in London
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✅ Full design, planning permission, and construction support
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✅ Competitive pricing, including cheap loft conversion options
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✅ Coverage across East, North, South, and Greater London
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✅ Trusted by clients for quality, safety, and efficiency
Frequently Asked Questions
Q: How long does a loft conversion take in London?
A: Most projects take 6–10 weeks depending on complexity.
Q: Do I need planning permission?
A: Many loft conversions fall under permitted development, but we’ll guide you through the process.
Q: Will a loft conversion increase my property value?
A: Yes — on average, a loft conversion can add up to 20% to your home’s value.
Our Latest Loft Conversion Project in London
Take a look at some of our recent basement conversions across London. From transforming dark, unused cellars into bright family living spaces, to creating luxury gyms, wine cellars, and home cinemas, these projects highlight our ability to combine structural expertise with creative design. Every basement we deliver is safe, stylish, and built to last — adding both value and functionality to London homes.
Loft Conversions Company in London by Borough
At Bigness, we specialise in creating beautiful and functional loft conversions across London. From transforming empty roof spaces into bright bedrooms and offices, to designing luxury en-suites and open-plan studios, our team delivers tailored solutions that add space and value to your home. Explore the boroughs below to find professional loft conversion services near you.
Barking and Dagenham / Barnet / Bexley / Brent / Bromley / Camden / Croydon / Ealing / Enfield / Greenwich / Hackney / Hammersmith and Fulham / Haringey / Harrow / Havering / Hillingdon / Hounslow / Islington / Kensington and Chelsea / Kingston upon Thames / Lambeth / Lewisham / Merton / Newham / Redbridge / Richmond upon Thames / Southwark / Sutton / Tower Hamlets / Waltham Forest / Wandsworth / Westminster