Seamless integration with your existing property. Our Tonbridge architects ensure your new loft looks like it was always meant to be there.
Get Your Free Tonbridge QuoteSee what your Tonbridge neighbours say about our loft conversion work.
"Exceptional value for money. We got quotes from three Tonbridge firms and Building Group offered the best spec for the price."
"The 10-year guarantee gave us peace of mind. A trustworthy company serving the Tonbridge area."
"We hired them for a shell conversion in Tonbridge and were so impressed we asked them to complete the fit-out too. Five stars."
"Professional service from start to finish. Our hip-to-gable conversion has added so much space to our Tonbridge home. Quality workmanship."
"Building Group transformed our Tonbridge property's unused loft into two beautiful bedrooms. Excellent communication throughout and competitive pricing."
"I was expecting dust everywhere, but they left my Tonbridge house cleaner than they found it. Wizards, not builders!"
See more genuine Tonbridge customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Tonbridge 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 Tonbridge, we create bespoke solutions tailored to your lifestyle.
Our experienced Tonbridge team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Tonbridge conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Tonbridge property to maximize space and value
The most cost-effective option for Tonbridge properties using roof windows for natural light. Perfect for Tonbridge homes with adequate headroom.
Add valuable floor space and headroom to your Tonbridge property with single or multiple dormers. Popular choice in Tonbridge for space optimization.
Transform sloping hip roofs into vertical gable walls in your Tonbridge home, significantly increasing usable floor space. Ideal for Tonbridge semi-detached properties.
The premium option for Tonbridge properties creating maximum space with near-vertical walls. Perfect for period properties in Tonbridge.
Your Tonbridge property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Tonbridge specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Tonbridge property and budget. Most Tonbridge conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Tonbridge 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 Tonbridge housing stock.
Living in a terraced or semi-detached house in Tonbridge? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Tonbridge loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Tonbridge properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Tonbridge engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Tonbridge homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Tonbridge loft.
Plastering, decorating, flooring, and interior design services to create beautiful Tonbridge living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Tonbridge city centre, including period properties, modern homes, and conservation areas requiring specialist Tonbridge planning expertise.
Expert loft conversion services across all Tonbridge suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Tonbridge.
Specialist conversions for Tonbridge's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Tonbridge conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Tonbridge Loft Conversions Completed
Average Tonbridge Customer Rating
Years Serving Tonbridge
Tonbridge Building Control Approved
With over 15 years of experience in Tonbridge, we understand local planning requirements, building regulations, and architectural styles. Our Tonbridge team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Tonbridge terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Tonbridge semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Tonbridge conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"Exceptional value for money. We got quotes from three Tonbridge firms and Building Group offered the best spec for the price."
- Paul Roberts, Tonbridge
"The 10-year guarantee gave us peace of mind. A trustworthy company serving the Tonbridge area."
- Michael Hughes, Tonbridge
"We hired them for a shell conversion in Tonbridge and were so impressed we asked them to complete the fit-out too. Five stars."
- Emily Lewis, Tonbridge
Loft conversion costs in Tonbridge vary based on type, size, and specifications. Typical Tonbridge 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 Tonbridge quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Tonbridge survey and detailed quote.
A transparent guide to typical conversion costs in the Tonbridge 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 Tonbridge properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Tonbridge 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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