Add a luxurious master suite or a quiet home office. Our Grantham team are experts in maximizing light and space in every loft conversion.
Get Your Free Grantham QuoteSee what your Grantham neighbours say about our loft conversion work.
"Our hip-to-gable conversion has completely changed our family life. We finally have the space we need in Grantham without moving."
"Exceptional value for money. We got quotes from three Grantham firms and Building Group offered the best spec for the price."
"The best decision we made for our Grantham house. The extra office space is perfect. Great attention to detail from the whole team."
"They managed the party wall agreement with our Grantham neighbors professionally. The whole street was impressed with their cleanliness."
"We hired them for a shell conversion in Grantham and were so impressed we asked them to complete the fit-out too. Five stars."
"The 10-year guarantee gave us peace of mind. A trustworthy company serving the Grantham area."
See more genuine Grantham customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Grantham 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 Grantham, we create bespoke solutions tailored to your lifestyle.
Our experienced Grantham team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Grantham conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Grantham property to maximize space and value
The most cost-effective option for Grantham properties using roof windows for natural light. Perfect for Grantham homes with adequate headroom.
Add valuable floor space and headroom to your Grantham property with single or multiple dormers. Popular choice in Grantham for space optimization.
Transform sloping hip roofs into vertical gable walls in your Grantham home, significantly increasing usable floor space. Ideal for Grantham semi-detached properties.
The premium option for Grantham properties creating maximum space with near-vertical walls. Perfect for period properties in Grantham.
Your Grantham property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Grantham specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Grantham property and budget. Most Grantham conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Grantham 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 Grantham housing stock.
Living in a terraced or semi-detached house in Grantham? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Grantham loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Grantham properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Grantham engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Grantham homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Grantham loft.
Plastering, decorating, flooring, and interior design services to create beautiful Grantham living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Grantham city centre, including period properties, modern homes, and conservation areas requiring specialist Grantham planning expertise.
Expert loft conversion services across all Grantham suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Grantham.
Specialist conversions for Grantham's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Grantham conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Grantham Loft Conversions Completed
Average Grantham Customer Rating
Years Serving Grantham
Grantham Building Control Approved
With over 15 years of experience in Grantham, we understand local planning requirements, building regulations, and architectural styles. Our Grantham team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Grantham terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Grantham semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Grantham conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"Our hip-to-gable conversion has completely changed our family life. We finally have the space we need in Grantham without moving."
- Robert Smith, Grantham
"Exceptional value for money. We got quotes from three Grantham firms and Building Group offered the best spec for the price."
- Maria Garcia, Grantham
"The best decision we made for our Grantham house. The extra office space is perfect. Great attention to detail from the whole team."
- Paul Roberts, Grantham
Loft conversion costs in Grantham vary based on type, size, and specifications. Typical Grantham 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 Grantham quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Grantham survey and detailed quote.
A transparent guide to typical conversion costs in the Grantham 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 Grantham properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Grantham 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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