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We are a sustainable London builder, delivering inspirational homes and workplaces with Passivhaus principles.

Our residential projects include new build architectural homes, refurbishments of heritage properties and house extensions at all scales. We can offer a complete turn-key solution, including design and build, sustainable refurbishment analysis, structural engineering, landscaping, specialist M&E and joinery.

Our team of craftspeople work toward the most stringent Passivhaus eco-design principles of airtightness, insulation, triple glazing and MVHR. This approach enables us to deliver low-energy properties that are healthy, warm and comfortable throughout the year with exceptionally low running costs.

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London house extension builder

Design and Build Approach

We specialise in creating bespoke architectural homes, and have a unique, architect-led design and build service in London and the south east.

Our four site teams are led by experienced architects and project managers, who are the principal point of contact for our clients throughout. They work with each site manager to ensure quality whilst monitoring progress and budget.

We have a contemporary approach to construction, enabled by a suite of digital management tools. These allow for seamless site communication during construction and improved client and aftercare services.more readmore

Expertise in London Homes

Our work includes both new build London homes and sensitive additions to heritage properties, including listed buildings and those in conservation areas.

We take pride in our ability to navigate the complexities of constrained London sites with neighbours in close proximity and we work closely with local residents to minimise noise and disruption.

Our preferred material palette of clay, lime, stone and timber is defined by a desire to create healthy, low VOC and low embodied energy spaces.

Whilst we can offer a complete design and build service, we also work with other designers to provide construction services only.

A Sustainable Builder

Environmental impact is a key consideration in our work. We take a fabric-first approach to sustainability based on the Passivhaus principles of airtightness, high-performance insulation, triple glazing and MVHR, delivering low-energy properties that are healthy, warm and comfortable throughout the year.

We build fossil fuel free homes, ultimately aiming for net zero energy in use. This accords with UK’s requirement to reach net zero across all sectors by 2050. The homes that we retrofit now will not be refurbished again before this date, so each project is critical. We have particular expertise in the installation of renewables such as solar panels, PV panels and heat pumps; including to heritage and listed properties.

In addition to the performance of our buildings in use, we carefully consider embodied energy. We use materials and processes with less embodied carbon and repurpose materials on-site where possible to reduce waste. For all other waste disposal, we use partners who are committed to diverting waste from landfill with transfer stations that specialise in re-use and re-cycling. If you are looking for a sustainable builder in London we’d be delighted to discuss your project.

A Professional Small Builder

Whilst we specialise in individual residential projects, we offer the professional approach of a larger building contractor. We invest in the skill of our team, encouraging development training and mentorship through a programme of skill-based courses. Our team of builders in London includes a Passivhaus-certified tradesperson and CSCS-qualified site managers.

At all times, we aspire to be the most professional and courteous builder in London. Our reputation for quality and reliability is derived from our exquisite workmanship and finishing skills.

AFL Build Clients

“We could not be happier with the outcome of our flat refurbishment. From our initial conversation with AFL Build to the completion of a stunning, stylish, and functional space, every step was met with thoughtfulness and skill. The construction team was incredibly considerate, understanding our vision while also ensuring our neighbours’ satisfaction throughout the process. We are thrilled with the results and highly recommend their services” – Anne McKenzie, Belsize Park NW3

“AFL Build completed a rear extension and adaptations to my Edwardian house to accommodate a disability. Our house extension blends in beautifully and was carefully constructed to meet all our needs and maximise the limited space. I’m filled with joy when I go into the kitchen each morning” – Bernadette Wright, Bow E3

Team