Our Story
We design it.
Then we make sure it gets built.
We’re designers who want to see a finished product. So we’ll make sure what you design gets delivered exactly as it’s drawn — we take on the stress so you don’t have to.
Get an Instant QuoteWhy we exist
Great drawings don’t always become great buildings.
Most architects design something beautiful, hand over the drawings, and move on. Then on site, corners get cut. Materials get swapped. The contractor makes decisions nobody approved. The building that goes up is a pale imitation of what was drawn.
We built extnd because we were tired of watching that happen. We’re a team of designers, architects, and engineers who care about the finished product — not just the drawings. So we stay involved from first sketch all the way to the moment you get your keys.
We take on the planning, the contractor coordination, the site visits, the problem-solving — so you never have to. One team, zero gaps, exactly as drawn.
How we got here
The extnd story
Built from a frustration with the gap between design and delivery — and a determination to close it.
Founded in London
extnd was founded by a group of design professionals who were frustrated watching their drawings get diluted on site. They wanted to build a practice where design integrity was non-negotiable.
First 50 projects
Built a reputation across London for residential extensions that actually matched the drawings. Word spread quickly — clients referred friends, and the team grew.
Full in-house delivery
Expanded to bring structural engineering and project management fully in-house. One team covering every stage, with no gaps in accountability.
200+ projects delivered
Now delivering 40+ projects a year across London, with a 5-star client rating and a 30-year combined team experience. Still the same mission: design it, then make sure it gets built.
What we stand for
How we work
Four principles that shape every project we take on.
Designed and delivered
Most design studios hand over drawings and walk away. We stay. We make sure every detail that was drawn is the detail that gets built — no substitutions, no shortcuts.
We take on the stress
Extensions are stressful. Planning, contractors, costs, timelines — it adds up fast. Our job is to absorb that complexity so you never have to feel it.
One team, no gaps
From first sketch to final handover, the same team is with you. No handoffs between departments, no lost context, no surprises. Just a clean line from idea to keys in hand.
Honest by default
We tell you the truth even when it's inconvenient. Realistic costs, honest timelines, and clear advice at every stage. No upselling, no fluff.
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