Make your neighbors jealous with the best loft conversion on the street. Building Group delivers the 'wow factor' to homes in Brentwood.
Get Your Free Brentwood QuoteSee what your Brentwood neighbours say about our loft conversion work.
"If you want a loft in Brentwood, just book these guys. Seriously. Don't waste time with anyone else. Building Group is the real deal."
"We are delighted with our Velux conversion in Brentwood. The builders were respectful and the finish is high quality. Highly recommended."
"They finished ahead of schedule! In the building trade! Unheard of! Best crew in Brentwood by a mile."
"High-end finish on our mansard extension. The carpentry and plastering work in our Brentwood home is flawless."
"We hired them for a shell conversion in Brentwood and were so impressed we asked them to complete the fit-out too. Five stars."
"My husband is finally out of the living room and into his new man-cave! Thank you Building Group for saving my sanity in Brentwood!"
See more genuine Brentwood customer reviews and loft conversion project galleries.
Read More ReviewsTransform your Brentwood 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 Brentwood, we create bespoke solutions tailored to your lifestyle.
Our experienced Brentwood team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Brentwood conversion maximizes space, natural light, and property value.
Choose the perfect conversion type for your Brentwood property to maximize space and value
The most cost-effective option for Brentwood properties using roof windows for natural light. Perfect for Brentwood homes with adequate headroom.
Add valuable floor space and headroom to your Brentwood property with single or multiple dormers. Popular choice in Brentwood for space optimization.
Transform sloping hip roofs into vertical gable walls in your Brentwood home, significantly increasing usable floor space. Ideal for Brentwood semi-detached properties.
The premium option for Brentwood properties creating maximum space with near-vertical walls. Perfect for period properties in Brentwood.
Your Brentwood property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Brentwood specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Brentwood property and budget. Most Brentwood conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.
Most terraced and semi-detached homes in Brentwood 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 Brentwood housing stock.
Living in a terraced or semi-detached house in Brentwood? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.
Comprehensive evaluation of your Brentwood loft space, structural assessment, and advice on the best conversion type for your property.
Architectural drawings, 3D visualizations, and planning permission applications for Brentwood properties. We handle all regulatory approvals.
Steel beam installation, floor strengthening, and staircase construction by qualified Brentwood engineers.
Velux roof windows, dormer construction, and window installations to maximize natural light in Brentwood homes.
Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Brentwood loft.
Plastering, decorating, flooring, and interior design services to create beautiful Brentwood living spaces.
Professional space assessment
Architectural drawings and approvals
Professional loft specialists
Professional loft conversions throughout Brentwood city centre, including period properties, modern homes, and conservation areas requiring specialist Brentwood planning expertise.
Expert loft conversion services across all Brentwood suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Brentwood.
Specialist conversions for Brentwood's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.
Expert handling of Brentwood conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.
Brentwood Loft Conversions Completed
Average Brentwood Customer Rating
Years Serving Brentwood
Brentwood Building Control Approved
With over 15 years of experience in Brentwood, we understand local planning requirements, building regulations, and architectural styles. Our Brentwood team delivers exceptional loft conversions that enhance your property value.
Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Brentwood terrace. Added 30sqm of living space.
Project Value: £48,000
Dormer loft conversion in modern Brentwood semi-detached. Created two bedrooms and bathroom for growing family.
Project Value: £42,000
Mansard conversion in Brentwood conservation area. Luxury master suite with dressing room and ensuite.
Project Value: £65,000
"If you want a loft in Brentwood, just book these guys. Seriously. Don't waste time with anyone else. Building Group is the real deal."
- Joseph Clark, Brentwood
"We are delighted with our Velux conversion in Brentwood. The builders were respectful and the finish is high quality. Highly recommended."
- Mark Thompson, Brentwood
"They finished ahead of schedule! In the building trade! Unheard of! Best crew in Brentwood by a mile."
- Rebecca Hill, Brentwood
Loft conversion costs in Brentwood vary based on type, size, and specifications. Typical Brentwood 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 Brentwood quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Brentwood survey and detailed quote.
A transparent guide to typical conversion costs in the Brentwood 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 Brentwood properties and subject to survey.
Senior Structural Specialist
"I oversee all loft conversions in the Brentwood 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 StudiesGet the extra space you need without the stress of moving. Expert advice for Brentwood families.
Book Free Brentwood Loft Survey