Unlock the potential of your property in London. We specialize in turning unused attics into beautiful bedrooms, bathrooms, and home offices.
Get Your Free London QuoteSee what your London neighbours say about our loft conversion work.
"If you want a loft in London, just book these guys. Seriously. Don't waste time with anyone else. Building Group is the real deal."
"We are delighted with our Velux conversion in London. The builders were respectful and the finish is high quality. Highly recommended."
"We went from 'cramped' to 'camped out in luxury'. Our new loft bedroom is the best room in our London house."
"Building Group transformed our London property's unused loft into two beautiful bedrooms. Excellent communication throughout and competitive pricing."
"I was expecting dust everywhere, but they left my London house cleaner than they found it. Wizards, not builders!"
"Cannot recommend them enough for loft conversions in London. They handled all the planning permission and the build was smooth."
See more genuine London customer reviews and loft conversion project galleries.
Read More ReviewsTransform your London property's unused loft space into beautiful, functional living areas with our professional loft conversion services. Whether you need an extra bedroom, home office, or playroom in London, we create bespoke solutions tailored to your lifestyle.
Our experienced London team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your London conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your London property to maximize space and value
The most cost-effective option for London properties using roof windows for natural light. Perfect for London homes with adequate headroom.
Add valuable floor space and headroom to your London property with single or multiple dormers. Popular choice in London for space optimization.
Transform sloping hip roofs into vertical gable walls in your London home, significantly increasing usable floor space. Ideal for London semi-detached properties.
The premium option for London properties creating maximum space with near-vertical walls. Perfect for period properties in London.
Your London property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our London specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your London property and budget. Most London conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in London have a 40-50 cubic meter allowance for roof extensions without full planning permission. We handle all Lawful Development Certificate applications for you.
Every conversion we build is inspected by approved inspectors to ensure compliance with Part B (Fire Safety) and Part L (Insulation) of the building regulations specific to London housing stock.
Living in a terraced or semi-detached house in London? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your London loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for London properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified London engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in London homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your London loft.
Plastering, decorating, flooring, and interior design services to create beautiful London living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout London city centre, including period properties, modern homes, and conservation areas requiring specialist London planning expertise.
Expert loft conversion services across all London suburban areas. Specializing in semi-detached, detached, and terraced properties throughout London.
Specialist conversions for London's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of London conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
London Loft Conversions Completed
Average London Customer Rating
Years Serving London
London Building Control Approved
With over 15 years of experience in London, we understand local planning requirements, building regulations, and architectural styles. Our London team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian London terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern London semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in London conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"If you want a loft in London, just book these guys. Seriously. Don't waste time with anyone else. Building Group is the real deal."
- Helen Baker, London
"We are delighted with our Velux conversion in London. The builders were respectful and the finish is high quality. Highly recommended."
- Robert Smith, London
"We went from 'cramped' to 'camped out in luxury'. Our new loft bedroom is the best room in our London house."
- Emma Johnson, London
Loft conversion costs in London vary based on type, size, and specifications. Typical London prices: Velux conversions £20,000-£30,000, Dormer conversions £35,000-£45,000, Hip-to-gable £40,000-£55,000, Mansard conversions £45,000-£65,000. All London quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free London survey and detailed quote.
A transparent guide to typical conversion costs in the London area (2025 Estimates)
| Conversion Type | Suitability | Timeframe | Price Range |
|---|---|---|---|
| Velux (Roof Light) | Existing headroom > 2.3m | 4-6 Weeks | £20k - £30k |
| Dormer (Rear) | Semis & Terraces | 6-8 Weeks | £35k - £50k |
| Hip-to-Gable | End-terrace & Semi-detached | 8-10 Weeks | £45k - £60k |
| Mansard | Period Properties / London Styles | 10-12 Weeks | £50k - £75k+ |
*Prices are indicative for London properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the London area. My job is to ensure your project meets local building regulations while maximizing every inch of space. I'm happy to visit your property for a preliminary structural assessment."
Four recent loft conversions across the UK — from a London mansard within a conservation area to an L-shaped Manchester dormer, a Birmingham hip-to-gable, and a Leeds rear dormer. Tap any project for the full case study.
Loft
Mansard loft conversion on a London Victorian terrace within a conservation area — full mansard build raising the rear roof line, slate-clad cheeks to match the neighbours, two double bedrooms with private en-suites, and a sky-lit landing. Approval secured under full planning, not Permitted Development.
Loft
L-shaped rear dormer loft conversion on a Victorian terrace — turning unused roof space into two double bedrooms and a shared en-suite, with two Velux windows to the front, a glass balustrade to the new staircase, and matching slate-grey finish to blend with the original roof.
Loft
Rear dormer loft conversion turning unused roof space into a master bedroom and en-suite, with two Velux roof windows to the front and a slim glass balustrade to the new staircase.
Loft
Hip-to-gable conversion with rear dormer on a 1930s semi-detached — squaring off the original hipped roofline to gain full standing headroom, creating a master bedroom with built-in wardrobes and a generous en-suite, plus a third Velux to the front for natural light.
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