Running out of room? The only way is up! Building Group raises the roof (literally) to give you the space you need in Sevenoaks.
Get Your Free Sevenoaks QuoteSee what your Sevenoaks neighbours say about our loft conversion work.
"Fantastic loft conversion in our Sevenoaks home. The team was professional, tidy, and finished on time. Our new master bedroom with ensuite is stunning."
"Our hip-to-gable conversion has completely changed our family life. We finally have the space we need in Sevenoaks without moving."
"Top quality dormer conversion. Added significant value to our Sevenoaks property. Friendly team and very clean working environment."
"Cannot recommend them enough for loft conversions in Sevenoaks. They handled all the planning permission and the build was smooth."
"Building Group provided excellent advice on the best layout for our Sevenoaks terrace. The result is better than we imagined."
"The 10-year guarantee gave us peace of mind. A trustworthy company serving the Sevenoaks area."
See more genuine Sevenoaks customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Sevenoaks 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 Sevenoaks, we create bespoke solutions tailored to your lifestyle.
Our experienced Sevenoaks team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Sevenoaks conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Sevenoaks property to maximize space and value
The most cost-effective option for Sevenoaks properties using roof windows for natural light. Perfect for Sevenoaks homes with adequate headroom.
Add valuable floor space and headroom to your Sevenoaks property with single or multiple dormers. Popular choice in Sevenoaks for space optimization.
Transform sloping hip roofs into vertical gable walls in your Sevenoaks home, significantly increasing usable floor space. Ideal for Sevenoaks semi-detached properties.
The premium option for Sevenoaks properties creating maximum space with near-vertical walls. Perfect for period properties in Sevenoaks.
Your Sevenoaks property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Sevenoaks specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Sevenoaks property and budget. Most Sevenoaks conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Sevenoaks 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 Sevenoaks housing stock.
Living in a terraced or semi-detached house in Sevenoaks? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Sevenoaks loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Sevenoaks properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Sevenoaks engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Sevenoaks homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Sevenoaks loft.
Plastering, decorating, flooring, and interior design services to create beautiful Sevenoaks living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Sevenoaks city centre, including period properties, modern homes, and conservation areas requiring specialist Sevenoaks planning expertise.
Expert loft conversion services across all Sevenoaks suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Sevenoaks.
Specialist conversions for Sevenoaks's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Sevenoaks conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Sevenoaks Loft Conversions Completed
Average Sevenoaks Customer Rating
Years Serving Sevenoaks
Sevenoaks Building Control Approved
With over 15 years of experience in Sevenoaks, we understand local planning requirements, building regulations, and architectural styles. Our Sevenoaks team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Sevenoaks terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Sevenoaks semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Sevenoaks conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"Fantastic loft conversion in our Sevenoaks home. The team was professional, tidy, and finished on time. Our new master bedroom with ensuite is stunning."
- Olivia White, Sevenoaks
"Our hip-to-gable conversion has completely changed our family life. We finally have the space we need in Sevenoaks without moving."
- Karen Clarke, Sevenoaks
"Top quality dormer conversion. Added significant value to our Sevenoaks property. Friendly team and very clean working environment."
- Sarah Jenkins, Sevenoaks
Loft conversion costs in Sevenoaks vary based on type, size, and specifications. Typical Sevenoaks 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 Sevenoaks quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Sevenoaks survey and detailed quote.
A transparent guide to typical conversion costs in the Sevenoaks 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 Sevenoaks properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Sevenoaks 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.
Want to see the rest of our portfolio?
View All Case StudiesThe only way is up, baby! Let's raise the roof on your Sevenoaks property today.
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