We specialize in Victorian, Edwardian, and modern property conversions across Alton. Let us help you realize your home's full potential.
Get Your Free Alton QuoteSee what your Alton neighbours say about our loft conversion work.
"Exceptional value for money. We got quotes from three Alton firms and Building Group offered the best spec for the price."
"Finally, a builder who turns up when they say they will! Restored my faith in tradesmen. Top job in Alton."
"I used to hit my head on the rafters. Now I can do jumping jacks in my new Alton bedroom. Incredible transformation."
"My husband is finally out of the living room and into his new man-cave! Thank you Building Group for saving my sanity in Alton!"
"Honest, reliable and skilled. Our mansard loft in Alton looks incredible. They finished exactly on budget."
"Building Group turned my scary spider attic into a 5-star hotel suite. My guests in Alton never want to leave!"
See more genuine Alton customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Alton 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 Alton, we create bespoke solutions tailored to your lifestyle.
Our experienced Alton team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Alton conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Alton property to maximize space and value
The most cost-effective option for Alton properties using roof windows for natural light. Perfect for Alton homes with adequate headroom.
Add valuable floor space and headroom to your Alton property with single or multiple dormers. Popular choice in Alton for space optimization.
Transform sloping hip roofs into vertical gable walls in your Alton home, significantly increasing usable floor space. Ideal for Alton semi-detached properties.
The premium option for Alton properties creating maximum space with near-vertical walls. Perfect for period properties in Alton.
Your Alton property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Alton specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Alton property and budget. Most Alton conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Alton 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 Alton housing stock.
Living in a terraced or semi-detached house in Alton? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Alton loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Alton properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Alton engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Alton homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Alton loft.
Plastering, decorating, flooring, and interior design services to create beautiful Alton living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Alton city centre, including period properties, modern homes, and conservation areas requiring specialist Alton planning expertise.
Expert loft conversion services across all Alton suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Alton.
Specialist conversions for Alton's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Alton conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Alton Loft Conversions Completed
Average Alton Customer Rating
Years Serving Alton
Alton Building Control Approved
With over 15 years of experience in Alton, we understand local planning requirements, building regulations, and architectural styles. Our Alton team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Alton terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Alton semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Alton conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"Exceptional value for money. We got quotes from three Alton firms and Building Group offered the best spec for the price."
- William Turner, Alton
"Finally, a builder who turns up when they say they will! Restored my faith in tradesmen. Top job in Alton."
- Daniel Evans, Alton
"I used to hit my head on the rafters. Now I can do jumping jacks in my new Alton bedroom. Incredible transformation."
- Sarah Jenkins, Alton
Loft conversion costs in Alton vary based on type, size, and specifications. Typical Alton 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 Alton quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Alton survey and detailed quote.
A transparent guide to typical conversion costs in the Alton 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 Alton properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Alton 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 StudiesContact us today for a free design consultation and detailed quote for your Alton property.
Book Free Alton Loft Survey