About buildLONDON Extensions

buildLONDON is proud to provide seamless integrated extensions, which merge into an existing home, and create a desired link between inside and outside spaces. Our designs introduce more light and peace to your home and provide comfort to your existing lifestyle.


Our aim is to make your house extension as uncomplicated as possible. With over 1500 satisfied clients, featured works in countless publications and an impressive infrastructure we remain one of the biggest and most popular extension companies in London.


With all of our construction divisions we take every aspect of the work, from surveying to design to structural calculations through each construction phase. We provide this service up to 10 years post-completion with assistance from our warranty and maintenance services.


We offer beautiful extensions at attractive prices with a high standard of finish. Our quality product delivery method is what makes us stand out in the field. We are unique in the structure of our business, which has been formed to maximize quality, speed and efficiency for clients and our teams.


Our design team is all in house and employed directly by the company. We don’t sub-contract any work. Our staff also includes project managers, who have built over 1500 extensions in the capital alone. Most importantly, we also employ tradesmen. Directly employing trades enables us to deliver quality, reliability and a skill-set, which is difficult to obtain from contractors. We only use sub-contractors for a specific project expertise, who must undergo a full 6-month vetting process beforehand to work with us on any projects.


Every project we operate is managed and completed by an experienced project manager, who ensures the building process runs as smoothly as possible. They are your main people of contact, along with a customer care line, so all questions and queries will always be answered as quickly as possible.


Our experience, qualifications and professional accreditations have allowed us to develop the smoothest construction scheme and most effective cost on the market. We work alongside no less than 6 professional bodies as well as licensed building control to help ensure we are meeting the standards expected from our profession.


Every project is insurance backed and has a 10-year warranty, which is designed to protect our clients against defects.


Home extensions are one of the best ways to increase space and value in any home. It’s estimated that extensions are one of the best investments in property today. In fact our works can often add up to 30% value to the property, without a substantial investment.


buildLONDON Extensions is locally one of the most reliable specialist extensions companies, which delivers quality product and provides excellent customer service.


See the results of this commitment >


warranty_icon        10 Year Warranty


When you choose build London to build your extension, you receive a 10-year warranty once the work is completed.


For some of the products and systems we install, such as waterproofing, we also provide our clients with a 30-year warranty to ensure the right solution to any issue.


We are confident about our work and we commit to it by providing you with a fully insurance-backed warranty. If you experience any problems with a project due to our work within a 10-year period, we will take care of it at our own cost.


Insurance-backed, means that the warranty is covered even if we are unable to fulfill this obligation.


All the information and paperwork is included in your completion pack, with the direct contact details of our service department, which is ready to resolve any issues.


Additionally, we provide comprehensive insurance for all works and liabilities, which we undertake throughout the construction project. This type of coverage is provided to also satisfy home insurers and mortgage companies. A copy of all the information is provided to you prior to any work.



service_icon        Service Areas


Our Company is based in South London, but we provide our services in any area within Greater London.

You will be surprised, but we have probably already had a project close to you, or even in the very same street.


We also offer our services in the Home Counties.

We have completed hundreds of projects in these areas and provided excellent service.


online_icon        Online Estimate

Explore divisions