Loft Conversions Specialists – London
Transform your unused loft into a stunning new living space with Bigness Group — London’s trusted experts in bespoke loft conversions.
At Bigness Group, we specialise in high-quality loft conversions across London, turning empty attic spaces into beautiful, functional rooms. Whether you’re expanding your family home, creating a home office, or adding property value, our design-and-build team handles everything from structural works to final finishes.
Our loft conversions combine architectural precision with energy efficiency and compliance — all delivered on time, on budget, and with minimal disruption.
Types of Loft Conversions
Each property is unique, so we tailor every project to fit your roof type, structure, and planning constraints.
Mansion Block Loft Conversions – Elegant conversions within heritage and mansion blocks, maximising headroom while preserving architectural character.
Dormer Loft Conversion – Adds a box-shaped extension to increase floor area and natural light, perfect for bedrooms and en-suites.
Hip to Gable Loft Conversions – Extends the sloping side roof to a vertical wall, ideal for semi-detached and end-of-terrace homes.
Mansard Loft Conversions – A stylish, full-width rear extension with steep roof slopes — common in London’s conservation areas.
L-shaped Dormer Loft Conversion – Combines two dormers for maximum internal space; excellent for Victorian and Edwardian properties.
New Build Loft Conversions – Integrating loft design directly into new developments or extensions for seamless results.
Trussed Roof Loft Conversions – Specialist conversions requiring engineered solutions to open up pre-fabricated truss frameworks.
Velux Loft Conversions – Uses roof-light windows without altering the roofline — cost-effective and quick to complete.
Loft Pods & House Extension Pods – Modular extensions that add a contemporary touch and extra square footage.
Loft Conversion With Roof Terrace – Combines indoor living with outdoor luxury through bespoke terrace access and waterproofing systems.
Loft Conversion Planning Permission
Converting your loft often falls under permitted development, but not always. Our team provides expert guidance on whether planning approval is needed, managing all architectural drawings, applications, and compliance steps.
We handle:
- Loft Conversion Process – From design and structural calculations to completion certificates.
- Do I Need Planning Permission for My Loft Conversion? – We’ll assess based on volume limits, roof alterations, and conservation status.
- Complex Loft Conversions – Including mansards, listed properties, and flats.
- Party Wall Agreements – Full support with notices, surveyors, and legal compliance.
- Permitted Development Rights – Maximising what you can achieve without formal applications.
Loft Conversion Process
Our proven step-by-step process ensures precision, safety, and peace of mind:
- Consultation & Feasibility – Site visit, measurements, and feasibility analysis.
- Design & Planning – Architectural drawings, planning submission, and structural calculations.
- Preparation & Build – Scaffolding, structural steel installation, and roof modifications.
- Interior Works – Electrical, plumbing, insulation, plastering, and finishing.
- Quality Inspection & Handover – Full compliance check and client walkthrough before sign-off.
Why Choose Bigness Group
- Experienced design-and-build specialists across all loft types
- Transparent pricing with no hidden extras
- Dedicated project management from concept to completion
- Compliance with Building Regulations & Party Wall Act
- High-quality finishes, energy-efficient materials, and sustainable methods
- 10-year structural guarantee on all conversions
Loft Conversion FAQ
Q: How long does a loft conversion take?
A: Most projects take between 6–10 weeks, depending on complexity and design.
Q: Do I need planning permission?
A: Not always — most lofts fall under permitted development, but we confirm this during planning.
Q: Will I need to move out?
A: In most cases, you can stay home. We plan works to minimise disruption.
Q: Can you manage structural design and drawings?
A: Yes — we handle everything in-house, including engineering and architectural plans.
Q: Do you provide guarantees?
A: All Bigness loft conversions include a 10-year structural warranty and Building Control certification.
Our Latest Loft Conversion Projects
Discover how Bigness transforms London homes. From compact attic rooms to full-width mansards, our case studies showcase precision craftsmanship and architectural innovation.
Loft Conversions in London by Borough
We deliver professional loft conversion services across all 32 London boroughs — including Camden, Chelsea, Barnet, Croydon, Ealing, Enfield, Hackney, Hammersmith, Islington, Kensington, Richmond, and more. Each area benefits from our local expertise and quick response times.
Barking and Dagenham / Barnet / Bexley / Brent / Bromley / Camden / Croydon / Ealing / Enfield / Greenwich / Hackney / Hammersmith and Fulham / Haringey / Harrow / Havering / Hillingdon / Hounslow / Islington / Kensington and Chelsea / Kingston upon Thames / Lambeth / Lewisham / Merton / Newham / Redbridge / Richmond upon Thames / Southwark / Sutton / Tower Hamlets / Waltham Forest / Wandsworth / Westminster
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