Services
House Extensions in Harefield & West London
Single, double-storey and wrap-around extensions that add the space — and the light — your home has been missing.
Single, double-storey and wrap-around extensions that add the space — and the light — your home has been missing.
An extension is the most reliable way to add genuine living space to a home you already love. We design the right footprint for your plot and your street, engineer it properly, and finish it so the new space feels original — not bolted on.
Rear and side extensions that open up the ground floor.
Adding bedrooms and bathrooms above new living space.
Reclaiming the side return on period terraces for full-width rooms.
Knock-throughs and glazed extensions built around how you live.
Drawings, structural engineering and build under one contract.
We advise on consent and prepare the applications for you.
A few of the areas we cover for house extensions — see all 36 on our areas page.
We visit your home, understand your brief and take the measurements that make a quote meaningful.
Drawings, structural engineering and planning or building-regs applications, handled for you.
One project-managed team on site — tidy, communicative and accountable from strip-out to snagging.
A clean finish, your completion pack, and a workmanship guarantee that stands behind the work.
It depends on size, structure and finish — a single-storey rear extension typically starts well into five figures, with double-storey and wrap-around projects costing more. We give a clear, written quote after a survey.
Many extensions fall under permitted development, but size, height and conservation status all matter. We advise early and prepare any planning or building-regs applications for you.
Most single-storey extensions take around 10–16 weeks on site, depending on groundworks, structure and finish. We give you a programme before we start.
A well-designed extension that improves how the whole house works usually adds value — particularly kitchen and open-plan projects. We design for liveability first, which is what buyers pay for.
Yes. We can take a project from first sketch through structural engineering, planning and construction under one accountable team, so there are no gaps between designer and builder.
What a house extension really costs in West London in 2026 — the price drivers, the extras people forget, and when you need planning permission.
Loft conversion or rear extension? A straight comparison of cost, disruption, planning and value to help you pick the right way to add space to your home.
Tell us about your project and we'll arrange a survey and a clear, written quote.
