A full width dormer loft conversion creates a practical and bright new floor across the entire width of your roof, adding maximum usable space, natural light, and value to your home. We help London homeowners secure more bedrooms, versatile home offices, and luxurious en-suites with tailored loft conversion full width dormers—always delivered to our renowned standards and fixed price.
We serve growing families, homeowners, and investors throughout South London: Balham, Battersea, Beckenham, Bromley, Clapham, Streatham, and nearby areas. With 20 years’ specialised experience, a decade-long warranty, and £10 million insurance coverage, we combine honest craftsmanship with total peace of mind. Imagine what life could look like with that extra space and light—right where you already live.
A full width dormer transforms your dark, underused loft into a spacious living area, typically fitting a double bedroom, bathroom, and even a dedicated study or playroom. Unlike partial dormers, the full width option offers an unbroken layout, higher ceilings, and extra headroom, suitable for families prioritising every square metre of their London home.
Our methodology uses the latest sustainable materials—sheep’s wool insulation, triple-glazed windows, and solar-powered skylights. These features deliver year-round comfort and lower bills, enhancing your EPC rating and resale value. Smart home integration, such as climate and lighting controls, adds modern convenience and security.
We address common customer concerns head-on: our full width dormer loft conversions come with a fixed price, clear paperwork, and daily project updates. There are no hidden extras. Our in-house team handles all architectural drawings, planning permission, and building regulations. Weekly quality checks and an independent inspection guarantee standards remain high from the initial survey to project handover.
| Features | Typical Price Range | Timeline |
|---|---|---|
| Standard full width dormer, insulation, lighting, staircase | Starting From £55,000 | 8–10 weeks |
| Ensuite bathroom, bespoke storage, skylights, smart control | Subject to Survey | 10–12 weeks |
| Studio flat conversion, kitchenette, full compliance docs | Subject to Survey | 12–14 weeks |
View a selection of our loft conversion projects in London below
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“Clapham construction service was extremely professional, the project was finished before the plan and we are so happy with our new space. Problems were resolved quickly and efficiently throughout the process.
This was one of our best investment that not only added value to our property but also a significant improve of our quality of life.” - Danilo Rico
Your journey to a more spacious, brighter home starts now with Clapham Construction. Get in touch for a free home survey, tailored planning advice, and a no-obligation fixed quotation. Delay risks missed opportunities to unlock hidden value in your property and enjoy more comfortable city living. Invest in an expertly managed, worry-free full width dormer loft conversion—with ongoing support at every step.
Contact us now and let us show you what honest experience, transparent pricing, and lasting craftsmanship can achieve. Book your free survey and start planning your full width dormer today.
Property investors and landlords often use London loft conversions to create self-contained studios or high-spec bedrooms with ensuites, helping to improve yields while meeting building control standards for fire safety, insulation, and ventilation. Wellness-focused homeowners are increasingly opting for large rooflights, quiet insulation, and spa-style bathrooms so the loft becomes a calm retreat above busy city streets.
We see strong demand for multi-functional rooms: home offices that can convert into guest rooms with a sofa bed, loft gyms with fold-away equipment, or playrooms designed to evolve into study spaces as children grow. Sustainable choices such as sheep’s wool insulation, reclaimed timber, bamboo flooring, triple-glazed windows, and solar-ready roof configurations are now standard talking points in nearly every design workshop.
Also known as rooflight conversions, Velux conversions install windows into the existing roof slope without altering the roofline, making lofts bright and airy.
A variation of the dormer conversion with two windows, it offers more light, ventilation, and enhances property aesthetics.
Popular in London, it extends the roof for more floor space and headroom, fitting most house types.
Combines hip-to-gable and dormer techniques, transforming small lofts into spacious living areas.
Merges hip-to-gable and dormer methods, converting small lofts into roomy, functional areas.
Extends over the property’s back addition with a simpler structure than the L-shaped mansard, ideal for adding rooms or open layouts.
Alters the roof structure for a larger space, commonly seen in terraced houses in London.
London loft conversions require precise coordination between planning rules, structural design, neighbors, and logistics such as scaffolding and access. We take responsibility for the entire journey so you do not have to manage separate designers, engineers, and trades.
We handle all drawings, structural calculations, and planning or Lawful Development Certificate applications in-house, including conservation-area considerations and party wall advice where relevant. Scaffolding is almost always required at the front and rear, sometimes at the side, and typically remains in place for most of the 8 to 10 week build so our team can work safely and efficiently.
Our process is documented—every step, from the initial survey to post-completion care, is tracked and reviewed for accountability. We strictly follow all London planning permissions, building control, and safety standards, including the 2025 regulations for sustainable materials and permitted development rights.
We manage the design and build for you, planning permission, structural design, building control and your project manager will be on your site almost daily to oversee the works and keep you updated.
Our works are warrantied, but they will stand much monger than that. We are builders primarily and our teams are experts with quality on our mind – you will get weekly inspections by the owner to ensure we deliver.
Exactly what it says. We provide you with a warranty to cover you and your home for any defect from our works so you don’t have to worry. In addition you get an independent certificate by the regulators confirming that our works meet the approved building standards.
Getting A loft or attic conversion with us can add up to 25% to the value of your home, making it one the best investments you can make.
Experience the Clapham Construction Difference
Your new, spacious bungalow starts here—enquire today for a free home survey and fixed quote. Every week without a bungalow dormer loft conversion is space and value unrealised. Secure your property’s future for your family or investment with a team trusted across London.
Contact us to request your complimentary survey, planning advice call, or to download our comprehensive structural guide. Our experts would be delighted to guide you at every step.
Simple, Transparent Pricing & Tailored Packages
Every project features our no-surprise payment schedule and a fixed price promise. With options for every property size, you can upgrade at any stage without re-pricing. All quotations are free and include a site visit and compliance check.
| Features | Starting Price |
|---|---|
| New bedroom, structural works, insulation, stairs, skylights | From £50,000 |
| Full-width dormer, ensuite, fitted joinery, smart wiring | From £55,000 |
| Design, permissions, all finishes, premium materials, aftercare | From £65,000 |
Loft conversions often sit within tight terraces, shared roofscapes, and conservation areas. Our 20 years’ specialised experience across Balham, Battersea, Bromley, and Fulham, means we understand local planning nuances, typical Victorian and Edwardian roof structures, and how phase works so neighbors and freeholders are kept informed and disruption is contained.
We operate across the whole of South London and can build lofts in the locations listed below.
With space becoming ever more valuable, many residents in South East London are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.
With space becoming ever more valuable, many residents in South West London are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.
With space becoming ever more valuable, many residents in South London are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.
With space becoming ever more valuable, many residents in East London are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.
With space becoming ever more valuable, many residents in West London are looking to loft conversions to maximise their living space, adding both value and functionality to their properties.
Every homeowner we meet wants to avoid hidden costs, excessive noise, and unreliable contractors. We recognise these fears. Our process minimises mess, with major disruption typically lasting just a few days—planned around your life. More than 90% of clients continue living at home during the works, with our project managers on-site daily to answer questions and adapt to your priorities.
Most full width dormer loft conversions in London fall under permitted development rights, meaning no formal consent is needed if we follow standard criteria. We handle all paperwork, including drawing up plans and applying for Lawful Development Certificates if required. Our in-house knowledge of local council rules means we prevent costly setbacks or refusals. If planning is needed, we guide you through every step—no surprises.
We do not use subcontractors. All work is overseen by our employed craftsmen, many of whom have been with us for years. What truly sets us apart is that Dan and I, as business owners, personally run every project, something rarely seen in the industry. We visit sites daily to manage the works, monitor progress, plan the next phase, and provide clients with ongoing advice, design tips, and clear next steps. This hands-on approach, combined with regular inspections and transparent communication throughout, is key to our reputation. Our fixed pricing, ten-year warranty, and after-care package demonstrate a commitment to accountability that’s often missing from the industry.
Read on to find out more about how new build houses can benefit from a professionally designed and executed loft conversion, adding valuable space and increasing the overall value of the property.
Find out more about the potential of detached houses and how a well-planned and executed loft conversion can transform them into spacious and functional living spaces.
Semi-detached houses offer great potential for a well-designed loft conversion, Read our guide on semi-detached loft conversions here.
A terraced house loft conversion can provide many benefits beyond just added space and increased value. It can also improve the overall functionality and layout of the house.
A full width dormer loft conversion extends across the entire rear width of your roof, creating a large, flat-roofed addition. This maximises internal floor space and headroom, ideal for bedrooms, bathrooms, and workspaces in London homes.
Most loft conversion full width dormer projects take around 8-10 weeks from start to finish. Timelines can extend if bespoke features or complex layouts are required, but clear planning keeps delays minimal.
Yes, over 90% of our clients continue living on-site. The first one to two weeks involve some noise above the first floor. After stair installation, disruption drops significantly and we work flexibly around your schedule.
Most full width dormer conversions fall under permitted development rights, but some properties—such as flats and listed buildings—require planning consent. We manage all permissions and recommend obtaining a Lawful Development Certificate.
While some dust and noise are unavoidable, the most disruptive works last just a few days. Our team uses dust barriers, and keeps the site clean and safe throughout, minimising impact on your daily life.
Our cost includes all architectural plans, materials, structural work, insulation, staircases, windows, electrics, and plumbing. Fixed quotations prevent hidden extras—only major design changes affect the final bill.
