Flat Roof Extensions South West London
27, Jun, 2025
Expand Your Home with a Modern Flat Roof Extension in South West London
Do you want to add more living space without compromising your garden? A flat roof extension is a smart and modern way to expand your home with a clean, contemporary design, whilst allowing plenty of natural light to enter your space.
At Denham Crescent, we specialise in flat roof extensions in South West London, handling everything from design and planning to building and the finishing touches. This means you can enjoy your new living area without stress.
What Is a Flat Roof Extension?
A flat roof extension is a single-storey structure that uses a flat or near-flat roof design to add valuable space to your property. It can be used for kitchen extensions, living rooms, home offices, or utility areas, depending on your needs.
Unlike pitched roofs, a flat roof modern extension provides a minimalist look that suits contemporary architecture and complements many London homes.
Who Should Consider a Flat Roof Extension?
You should consider a flat roof extension if:
You want a modern, clean-lined look for your extension.
You wish to increase your living space without taking up too much garden area.
You want to install skylights for additional natural light.
You are seeking a cost-effective way to extend your home.
You want a seamless connection between indoor and outdoor living.
If you’re unsure whether your home is suitable, we offer a free consultation to assess your property and guide you through the possibilities.
What Are the Benefits?
Contemporary Design
Flat roofs create a sleek, modern aesthetic that aligns with contemporary London living.
Brighter, Open Spaces
Flat roof extensions allow for roof lanterns or skylights, letting in natural light and making your new space bright and welcoming.
Cost-Effective
Flat roofs are generally more affordable to construct than pitched roofs, providing a practical and attractive extension without exceeding your budget.
Flexible Use
Whether you need a kitchen extension, a new living area, or a home office, a flat roof for extension can be designed around your lifestyle.
Adds Value
A well-built flat roof extension often increases the value of your property, making it a worthwhile investment if you plan to sell in the future.
Do I Need Planning Permission?
In many cases, flat roof extensions fall under Permitted Development Rights, so you may not need full planning permission, provided:
The extension does not exceed height and depth restrictions.
It takes up less than half the land around your original house.
Your property is not in a conservation area or a listed building.
At Denham Crescent, we handle all planning checks and applications, ensuring your extension complies with local council regulations and building control requirements, including insulation, drainage, and structural safety.
What’s Included in Our Flat Roof Extension Service?
We provide a full design-and-build service for your flat roof extension, including:
Free Consultation: We assess your property and discuss your vision and requirements to ensure a tailored solution.
Custom Design: We create a tailored design that complements your home and lifestyle.
Planning & Compliance: We handle all planning applications and ensure compliance with building regulations.
Construction: We take care of the entire build, including walls, roofing, and structural steelwork if required.
Glazing & Rooflights: We install skylights or roof lanterns to enhance natural light and create a sense of spaciousness.
Plumbing, Heating & Electrics: We cover all interior works, including underfloor heating if desired.
Finishes & Fittings: From flooring to final decoration, we deliver a ready-to-use space.
Flat Roof Extension FAQ
How long does a flat roof extension take?
Most flat roof extensions take around 10–14 weeks, depending on design complexity, finishes, and planning requirements.
Will a flat roof extension be bright enough?
Absolutely. We often include large skylights or roof lanterns to maximise light, making your extension feel open and airy.
Is a flat roof durable?
Modern flat roofs are highly durable, using advanced waterproofing systems and insulation to ensure long-lasting performance.
Can I live in my house whilst it's being built?
In most cases, yes. We manage dust, noise, and site safety to minimise disruption to your daily life.
Areas We Cover
We offer flat roof extensions in South West London, including:
Wimbledon | Raynes Park | Merton | Kingston | Tooting | Mitcham | Morden | Balham | Clapham
If you are outside these areas, please get in touch, as we often work on projects across a wider area of London.
Pricing Guide
The cost of our flat roof extension depends on its size, materials, and specifications.
Your detailed quote will include:
Full design and planning
All materials and labour
Complete project managementHigh-quality finishes
Optional additions, such as bi-fold doors, underfloor heating, and roof lanterns, are available with transparent, upfront pricing.
Get in Touch Today
Ready to create a modern, light-filled extension with a flat roof?
Contact Denham Crescent today to schedule a consultation. We will help you plan and build a stunning flat roof extension that doubles the value of your South West London property.
Share:
