Invest in your home with confidence. A Building Group loft conversion in Horsham is a proven way to significantly increase property value.
Get Your Free Horsham QuoteSee what your Horsham neighbours say about our loft conversion work.
"If you want a loft in Horsham, just book these guys. Seriously. Don't waste time with anyone else. Building Group is the real deal."
"We went from 'cramped' to 'camped out in luxury'. Our new loft bedroom is the best room in our Horsham house."
"The neighbors are jealous, the kids are happy, and the house value went up. The trifecta! Best investment in Horsham."
"We are delighted with our Velux conversion in Horsham. The builders were respectful and the finish is high quality. Highly recommended."
"Exceptional value for money. We got quotes from three Horsham firms and Building Group offered the best spec for the price."
"They finished ahead of schedule! In the building trade! Unheard of! Best crew in Horsham by a mile."
See more genuine Horsham customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Horsham 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 Horsham, we create bespoke solutions tailored to your lifestyle.
Our experienced Horsham team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Horsham conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Horsham property to maximize space and value
The most cost-effective option for Horsham properties using roof windows for natural light. Perfect for Horsham homes with adequate headroom.
Add valuable floor space and headroom to your Horsham property with single or multiple dormers. Popular choice in Horsham for space optimization.
Transform sloping hip roofs into vertical gable walls in your Horsham home, significantly increasing usable floor space. Ideal for Horsham semi-detached properties.
The premium option for Horsham properties creating maximum space with near-vertical walls. Perfect for period properties in Horsham.
Your Horsham property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Horsham specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Horsham property and budget. Most Horsham conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Horsham 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 Horsham housing stock.
Living in a terraced or semi-detached house in Horsham? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Horsham loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Horsham properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Horsham engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Horsham homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Horsham loft.
Plastering, decorating, flooring, and interior design services to create beautiful Horsham living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Horsham city centre, including period properties, modern homes, and conservation areas requiring specialist Horsham planning expertise.
Expert loft conversion services across all Horsham suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Horsham.
Specialist conversions for Horsham's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Horsham conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Horsham Loft Conversions Completed
Average Horsham Customer Rating
Years Serving Horsham
Horsham Building Control Approved
With over 15 years of experience in Horsham, we understand local planning requirements, building regulations, and architectural styles. Our Horsham team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Horsham terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Horsham semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Horsham conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"If you want a loft in Horsham, just book these guys. Seriously. Don't waste time with anyone else. Building Group is the real deal."
- Charles Scott, Horsham
"We went from 'cramped' to 'camped out in luxury'. Our new loft bedroom is the best room in our Horsham house."
- Daniel Evans, Horsham
"The neighbors are jealous, the kids are happy, and the house value went up. The trifecta! Best investment in Horsham."
- Maria Garcia, Horsham
Loft conversion costs in Horsham vary based on type, size, and specifications. Typical Horsham 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 Horsham quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Horsham survey and detailed quote.
A transparent guide to typical conversion costs in the Horsham 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 Horsham properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Horsham 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 StudiesSpeak to our friendly team about your requirements and get a fixed-price quote for your Horsham conversion.
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