Extension Builders
in London
Trusted by over 1,750 London home owners to design and build their extensionsReturn Extensions
Wraparound Extensions
Build Team is a design and build company working with homeowners across south and west London. From kitchen extensions to loft conversions, we handle the design, planning and build in one place, with a fixed-fee party wall service that takes care of the legal side. Your project runs smoothly from first drawing to finished build.
Our Services
Design and build extensions across south and west London. Explore each service below.
Kitchen Extensions
Open-plan kitchen extensions designed and built end to end.
Rear Extensions
Rear extensions that open up the back of your home for a bigger kitchen or living space.
Side Return Extensions
Side return extensions that infill the side alley for a wider, brighter kitchen.
Wraparound Extensions
Wraparound extensions that combine a rear and side return into one open space.
Ground Floor Extensions
Ground floor extensions that add living space across the ground floor of your home.
Loft Conversions
Loft conversions that turn unused roof space into a bedroom, bathroom or office.
Loft Extensions
Loft extensions that raise the roof or add a dormer for full-height space.
Party Wall Surveyors
Our party wall surveyors handle the legal side of your build with a fixed fee.
Fixed Fee
Design Packages

Payment in Arrears
Protect Your Pounds
Build Management
From Design to Build
Structural Guarantee
For 3 Years
Book a FREE Design Consultation today
Get started today by booking a consultation with one of our Architectural Designers.
You can also view our full calendar here.
Selected Case Studies
Milton Road
The Milton Road project, located in a Lambeth conservation area, was carefully designed to comply with local guidelines...
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Nightingale Mansions
Build Team is delighted to unveil our latest and one of our team’s favorite rear extension projects, situated in SW12...
Download PDF here
Heber Road
Build Team are proud to present our latest project, a stunning home extension in SE22...
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Our Testimonials
Had a great experience with Build Team as complete renovation novices. We liked the structured Build Team payment system with transparent costings. We would use again without hesitation if needed.
Build Team did our house top to bottom, and were very professional throughout. Our build manager was always organised and on top of things. A lot of things I wanted were not easy and they managed to deliver a really high end product.
I couldn't be more pleased with the work carried out by Build Team. From start to finish, Dan, Mark and the team ensured that we were kept informed of what was going to happen and when, so I could organise my family around the works. I would say Build Team made it as easy and hassle-free as humanly possible. We're so pleased with our new extension.
Having endured the problems of having major works carried out on our house in the form of a loft extension, I was aware of the pitfalls of incurring a poor builder. I was very fortunate to have Build Team as they were professional all throughout the build. It was a truly wonderful experience (something I never thought I would ever say about a major build).
We used Build Team for the design, planning and construction of our side return extension. We fully recommend them. Having done numerous projects this was by far the easiest and most stress-free (especially as we lived in the house whilst the works were happening). Both the build manager and main builder were exceptional, and dealt with any problems or changes efficiently.
Explore Our Gallery.
Browse our most recently completed extensions by taking a look through our Gallery.
It offers an insight into our work, as well as showing case studies of our projects.
Open Houses
Build Team’s Open House have moved online! You can now join us from the comfort of your own home, take a seat as we guide you through finished extensions project designed and built by us. Members of the team who have been involved and the homeowner join us to explain the process and answer your questions.
Our Recent 3D Projects
Virtually walk through some of our previous projects in 3D. These tours offers you an insight of what some of our completed projects looks like; helping you to visualise the potential of your new space, all from the comfort of your own home.
Gellatly Road
A Wraparound extension project in SE14 with a dedicated area for a home office, giving this growing family of four all the space they need to live, work and entertain.
East Dulwich Grove
A Ground Floor Extension where we added 28SQM of additional space to create an open plan living, kitchen and dining room with additional study and play space.
Thorpedale Road
Renovation of a family home in Finsbury Park flooded with natural light by the four large Architectural Skylights and the full-width Crittall doors to the garden.
