Extension Builder London
Looking to add more space to your home? At FOX HOME BUILDERS & DOUBLE GLAZING, we specialize in high-quality home extensions in London that are stylish, functional, and built to last. Whether you're dreaming of a larger kitchen, an extra bedroom, or a full ground-floor extension, our expert team can make it happen.
Trusted Extension Builders in London
With years of experience working across London, we understand how to design and build extensions that meet your needs and add real value to your home.
We build all types of extensions, including:
- Rear Extensions
- Side Return Extensions
- Wrap-Around Extensions
- Double Storey Extensions
- Kitchen & Open Plan Extensions
We specialise in home building services across North, East, South, and West London, including expert extensions, loft conversions, and new builds.
Why Choose Us as Your Extension Builder in London?
At FOX HOME BUILDERS & DOUBLE GLAZING, we take pride in delivering home extensions that blend seamlessly with your existing structure while adding space, light, and style.
Fully Insured & Certified Builders
Experienced Local London Team
Transparent Pricing & Detailed Quotes
High-Quality Craftsmanship
Energy-Efficient & Modern Designs
Timely Completion & Clean Worksites
Planning & Permissions, Serving All Areas of London
Worried about permits and building regulations? Don’t be. We help navigate the paperwork, liaise with local authorities, and ensure your extension is fully compliant with London building laws. Our in-house design and planning support makes your project smooth from start to finish.
Thinking of upgrading your windows or doors? Our Double Glazing division offers premium aluminium and uPVC solutions. As trusted double glazing suppliers and manufacturers in London, we deliver quality and performance you can rely on. Learn more about our Double Glazing services today!
Frequently Asked Questions
Not always. Some extensions fall under Permitted Development Rights, meaning they don’t require full planning permission. However, this depends on the size, type, and location of your extension. We offer in-house planning support and will help determine if permission is needed and manage all paperwork on your behalf.
Timeframes vary based on the type and complexity of the extension. On average:
- Rear or Side Extensions: 8–12 weeks
- Wrap-Around or Double Storey: 12–20 weeks
We provide a clear timeline before starting and work hard to complete all projects on schedule.
In most cases, no. We plan the work to minimize disruption, and many homeowners stay in their property throughout the project. If temporary relocation is advised for safety or convenience, we’ll let you know in advance and help plan accordingly.
Absolutely. We specialize in blending new builds seamlessly with your home’s original character—whether traditional or modern. From materials and finishes to layout and lighting, every detail is designed to complement your property.
Our full-service package includes:
✔️ Design & Architectural Drawings
✔️ Planning Permission & Building Regulations
✔️ Groundworks & Structural Work
✔️ Plumbing, Electrical & Insulation
✔️ Windows, Doors, and Final Finishes
✔️ Clean-up & Post-Project Support
We handle everything—from start to finish—so you can enjoy your new space stress-free.