Space that feels like it was always there.
We design and build home extensions from the first drawing to the finished room. One team manages architecture, planning, structural engineering and construction — so the result reflects the brief.
One team. No gap between design and build.
Most home extensions involve at least three separate businesses: an architect for the drawings, a structural engineer for the calculations, and a builder for the work. Coordinating between them adds time, cost, and risk of things getting lost in translation.
We coordinate architecture, structural engineering and construction through one Mansouri-managed team and one point of contact, under a single contract. Design and delivery answer to the same people, which is why the finished result looks like the drawing.
What we build.
Single-Storey Extensions
The most popular extension type — opening up kitchens, creating open-plan living, and connecting homes to gardens.
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IllustrativeDouble-Storey Extensions
Maximise your footprint over two floors — adding living space below and bedroom or bathroom space above.
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IllustrativeWraparound & Side-Return
Extend across the rear and down the side in one coordinated project — transforming the ground floor plan.
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IllustrativeLoft Conversions
Transform unused roof space into a functional bedroom, office or bathroom — often without extending the footprint at all.
Learn morePriced against a drawing, not a guess.
Cost follows the structure, the ground conditions and the specification, and those differ between two houses on the same street. We quote against an agreed design with the specification attached, itemised so you can see what is included and what is not.
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Extending heritage homes requires a different kind of expertise.
Listed buildings and period properties cannot simply be extended using standard construction methods. The materials, detailing and regulatory requirements are fundamentally different — and the consequences of getting them wrong are both visible and lasting.
We design extensions that sit naturally alongside historic buildings — using handmade brick, lime mortar, natural slate and oak framing to create additions that respect the host property's age and character. Every heritage extension project we undertake is designed to look as though it has always been there.
Ready to extend your home?
Tell us about your project. We will come back to you within 24 hours.
We carry £10M Employers Liability · £3M Public Liability · £1M Professional Indemnity