Turn that dusty, dark void above your head into cash in your pocket. A Building Group loft conversion is the smartest investment in Windsor.
Get Your Free Windsor QuoteSee what your Windsor neighbours say about our loft conversion work.
"They finished ahead of schedule! In the building trade! Unheard of! Best crew in Windsor by a mile."
"Building Group transformed our Windsor property's unused loft into two beautiful bedrooms. Excellent communication throughout and competitive pricing."
"Building Group were the only company to spot a potential issue with our chimney in Windsor and solved it before starting. True experts."
"We were worried about the disruption, but the team at Building Group were incredibly considerate of our home in Windsor."
"Building Group provided excellent advice on the best layout for our Windsor terrace. The result is better than we imagined."
"We hired them for a shell conversion in Windsor and were so impressed we asked them to complete the fit-out too. Five stars."
See more genuine Windsor customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Windsor 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 Windsor, we create bespoke solutions tailored to your lifestyle.
Our experienced Windsor team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Windsor conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Windsor property to maximize space and value
The most cost-effective option for Windsor properties using roof windows for natural light. Perfect for Windsor homes with adequate headroom.
Add valuable floor space and headroom to your Windsor property with single or multiple dormers. Popular choice in Windsor for space optimization.
Transform sloping hip roofs into vertical gable walls in your Windsor home, significantly increasing usable floor space. Ideal for Windsor semi-detached properties.
The premium option for Windsor properties creating maximum space with near-vertical walls. Perfect for period properties in Windsor.
Your Windsor property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Windsor specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Windsor property and budget. Most Windsor conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Windsor 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 Windsor housing stock.
Living in a terraced or semi-detached house in Windsor? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Windsor loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Windsor properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Windsor engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Windsor homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Windsor loft.
Plastering, decorating, flooring, and interior design services to create beautiful Windsor living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Windsor city centre, including period properties, modern homes, and conservation areas requiring specialist Windsor planning expertise.
Expert loft conversion services across all Windsor suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Windsor.
Specialist conversions for Windsor's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Windsor conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Windsor Loft Conversions Completed
Average Windsor Customer Rating
Years Serving Windsor
Windsor Building Control Approved
With over 15 years of experience in Windsor, we understand local planning requirements, building regulations, and architectural styles. Our Windsor team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Windsor terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Windsor semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Windsor conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"They finished ahead of schedule! In the building trade! Unheard of! Best crew in Windsor by a mile."
- Thomas Brown, Windsor
"Building Group transformed our Windsor property's unused loft into two beautiful bedrooms. Excellent communication throughout and competitive pricing."
- Maria Garcia, Windsor
"Building Group were the only company to spot a potential issue with our chimney in Windsor and solved it before starting. True experts."
- William Turner, Windsor
Loft conversion costs in Windsor vary based on type, size, and specifications. Typical Windsor 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 Windsor quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Windsor survey and detailed quote.
A transparent guide to typical conversion costs in the Windsor 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 Windsor properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Windsor 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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View All Case StudiesDon't let your loft be a 'maybe' space. Make it a 'definitely' space! Call the Windsor experts.
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