Transforming Thornbury Roofs into Living Spaces

Add a luxurious master suite or a quiet home office. Our Thornbury team are experts in maximizing light and space in every loft conversion.

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10-Year Warranty On all Structure
FMB Member Vetted Master Builders
Fully Insured £5m Public Liability
TrustMark Gov. Endorsed Quality

Why Choose Loft Conversion in Thornbury?

Transform your Thornbury property without moving. Add space and value with our expert loft conversion service.

Increase Thornbury Property Value

Add up to 20% to your Thornbury property value with a professional loft conversion.

Stay in Thornbury

No need to leave Thornbury. Get the space you need in your current home.

Quick Thornbury Installation

Most Thornbury loft conversions completed in 4-6 weeks with minimal disruption.

Extra Thornbury Living Space

Create bedrooms, offices, or playrooms perfect for Thornbury family living.

Expert Thornbury Loft Conversion Specialists

Transform your Thornbury 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 Thornbury, we create bespoke solutions tailored to your lifestyle.

Our experienced Thornbury team handles every aspect of your loft conversion project. From initial design and planning permission through to final decoration, we ensure your Thornbury conversion maximizes space, natural light, and property value.

  • Dormer loft conversions in Thornbury
  • Hip-to-gable conversions for Thornbury homes
  • Mansard loft conversions in Thornbury
  • Velux window installations across Thornbury
  • En-suite bathrooms for Thornbury lofts
  • Thornbury planning permission support
Thornbury loft conversion specialist at work

Thornbury Loft Specialists

CITB Certified • Thornbury Planning • Building Regulations

Types of Loft Conversions in Thornbury

Choose the perfect conversion type for your Thornbury property to maximize space and value

Velux Loft Conversion in Thornbury

Velux Loft Conversion Thornbury

The most cost-effective option for Thornbury properties using roof windows for natural light. Perfect for Thornbury homes with adequate headroom.

  • Most affordable in Thornbury
  • Minimal structural work
  • No Thornbury planning permission usually
  • Natural light throughout
Dormer Loft Conversion in Thornbury

Dormer Loft Conversion Thornbury

Add valuable floor space and headroom to your Thornbury property with single or multiple dormers. Popular choice in Thornbury for space optimization.

  • Maximum Thornbury space gain
  • Improved headroom
  • Additional windows
  • Cost-effective for Thornbury
Hip-to-Gable Conversion in Thornbury

Hip-to-Gable Conversion Thornbury

Transform sloping hip roofs into vertical gable walls in your Thornbury home, significantly increasing usable floor space. Ideal for Thornbury semi-detached properties.

  • Substantial Thornbury space increase
  • Improved room proportions
  • Better natural light
  • Enhanced Thornbury property value
Mansard Loft Conversion in Thornbury

Mansard Loft Conversion Thornbury

The premium option for Thornbury properties creating maximum space with near-vertical walls. Perfect for period properties in Thornbury.

  • Maximum Thornbury floor space
  • Multiple rooms possible
  • Period Thornbury property suitable
  • Highest value addition

Thornbury Loft Conversion Requirements

Your Thornbury property needs minimum 2.3m headroom at the highest point and sufficient floor area for conversion. Our Thornbury specialists provide free assessments to determine if your loft is suitable and advise on the best conversion type for your Thornbury property and budget. Most Thornbury conversions fall under permitted development rights, but we handle all planning and building regulations applications where required.

Thornbury Planning & Regulations Guide

Permitted Development in Thornbury

Most terraced and semi-detached homes in Thornbury have a 40-50 cubic meter allowance for roof extensions without full planning permission. We handle all Lawful Development Certificate applications for you.

Thornbury Building Control

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 Thornbury housing stock.

Party Wall Agreements

Living in a terraced or semi-detached house in Thornbury? We manage the Party Wall Notice process with your neighbors to ensure works can start on time.

Complete Thornbury Loft Conversion Services

Free Thornbury Loft Assessment

Comprehensive evaluation of your Thornbury loft space, structural assessment, and advice on the best conversion type for your property.

Thornbury Design & Planning

Architectural drawings, 3D visualizations, and planning permission applications for Thornbury properties. We handle all regulatory approvals.

Thornbury Structural Work

Steel beam installation, floor strengthening, and staircase construction by qualified Thornbury engineers.

Thornbury Windows & Dormers

Velux roof windows, dormer construction, and window installations to maximize natural light in Thornbury homes.

Thornbury En-Suite Bathrooms

Complete bathroom installations including plumbing, electrical work, and luxury fixtures in your Thornbury loft.

Thornbury Interior Finishing

Plastering, decorating, flooring, and interior design services to create beautiful Thornbury living spaces.

Our Thornbury Loft Conversion Process

Thornbury Planning & Design Phase

  • Free Thornbury Survey: Comprehensive assessment of your loft space
  • Design Development: Architectural drawings for Thornbury properties
  • Thornbury Planning Applications: Local authority submissions where required
  • Structural Calculations: Engineering assessments for Thornbury building control
  • Fixed Price Quote: Detailed Thornbury pricing with full breakdown

Thornbury Construction Phase

  • Project Management: Dedicated Thornbury project manager
  • Structural Work: Steel beams and strengthening in Thornbury
  • Roofing & Windows: Dormer construction for Thornbury homes
  • Services Installation: Thornbury certified electrical and plumbing
  • Interior Finishing: Quality finishing to Thornbury standards

Free Thornbury Survey

Professional space assessment

Thornbury Design & Planning

Architectural drawings and approvals

Expert Thornbury Construction

Professional loft specialists

Loft Conversions Across Thornbury

Thornbury City Centre

Professional loft conversions throughout Thornbury city centre, including period properties, modern homes, and conservation areas requiring specialist Thornbury planning expertise.

Thornbury Suburbs

Expert loft conversion services across all Thornbury suburban areas. Specializing in semi-detached, detached, and terraced properties throughout Thornbury.

Thornbury Period Properties

Specialist conversions for Thornbury's Victorian, Edwardian, and period properties. Sympathetic designs maintaining character while maximizing space.

Thornbury Conservation Areas

Expert handling of Thornbury conservation area requirements. We navigate planning restrictions and create beautiful conversions that comply with local regulations.

Thornbury Loft Conversion Statistics

500+

Thornbury Loft Conversions Completed

4.9/5

Average Thornbury Customer Rating

15+

Years Serving Thornbury

100%

Thornbury Building Control Approved

Why Choose Building Group for Thornbury Loft Conversions?

Local Thornbury Expertise

With over 15 years of experience in Thornbury, we understand local planning requirements, building regulations, and architectural styles. Our Thornbury team delivers exceptional loft conversions that enhance your property value.

Thornbury Quality Guarantee

  • Thornbury Planning Experts: We handle all local authority requirements
  • Local Thornbury Team: All work by trusted local professionals
  • 10-Year Guarantee: Full warranty on all Thornbury conversions
  • Fixed Thornbury Pricing: No hidden costs or surprises
  • Insurance: Fully insured for Thornbury projects

Thornbury Service Areas

  • Thornbury City Centre
  • North Thornbury
  • South Thornbury
  • East Thornbury
  • West Thornbury

Recent Thornbury Loft Conversion Projects

Hip to Gable Loft Conversion in Thornbury

Victorian Terrace - Thornbury

Hip-to-gable conversion creating master bedroom with ensuite in a Victorian Thornbury terrace. Added 30sqm of living space.

Project Value: £48,000

Dormer Loft Conversion in Thornbury

Modern Semi - Thornbury

Dormer loft conversion in modern Thornbury semi-detached. Created two bedrooms and bathroom for growing family.

Project Value: £42,000

Mansard Loft Conversion in Thornbury

Period Property - Thornbury

Mansard conversion in Thornbury conservation area. Luxury master suite with dressing room and ensuite.

Project Value: £65,000

What Thornbury Homeowners Say

★★★★★

"I actually miss having the builders around! Friendly, funny, and polite team. They became part of the family during our Thornbury project."

- Mark Thompson, Thornbury

★★★★★

"Building Group transformed our Thornbury property's unused loft into two beautiful bedrooms. Excellent communication throughout and competitive pricing."

- James Walker, Thornbury

★★★★★

"Cannot recommend them enough for loft conversions in Thornbury. They handled all the planning permission and the build was smooth."

- Robert Smith, Thornbury

Thornbury Loft Conversion Pricing Guide

Thornbury Loft Conversion Costs

Loft conversion costs in Thornbury vary based on type, size, and specifications. Typical Thornbury 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 Thornbury quotes include structural work, insulation, electrics, plastering, and building control fees. Contact us for a free Thornbury survey and detailed quote.

Estimated Investment for Thornbury Lofts

A transparent guide to typical conversion costs in the Thornbury 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 Thornbury properties and subject to survey.

Meet Your Thornbury Project Lead

Senior Loft Consultant for Thornbury

Mathew Oneill

Senior Structural Specialist

"I oversee all loft conversions in the Thornbury 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."

  • 20+ Years Exp.
  • CIOB Member

Create a New Master Bedroom in Thornbury

Don't let your loft be a 'maybe' space. Make it a 'definitely' space! Call the Thornbury experts.

Book Free Thornbury Loft Survey