Home Extensions in Ruislip & NW London

Single-Storey, Double-Storey and Side Extensions

Most NW London extensions fall into a handful of recognisable shapes. Single-storey rear extensions are the most common, opening up the kitchen-dining space into the back garden. Side returns make use of the alley space common in Victorian and Edwardian terraces. Wraparound extensions combine the two. Double-storey rear extensions add a bedroom and bathroom above the kitchen below. Each has its own structural and planning considerations.

We've done all of them over the years. The right shape for your property depends on what the house can structurally take, what's possible under permitted development or with a full planning application, what your neighbours will accept on a party-wall agreement, and what you actually need the extension to do day-to-day. We work through all of that at the quote stage before any drawings get costed.

Our Extension Process from Plans to Finish

Extensions usually start with an architect's drawings, structural engineer's calculations, and a Building Control application. Many of our clients come to us with those already in hand. If you don't have them yet, we work with local architects and can introduce you. The build itself begins with groundworks: footings dug to the depth and width specified, foundations poured to the engineer's spec, and steels installed where needed for openings or upper-storey loads.

From foundations the build moves through superstructure (brickwork, blockwork, timber framing), roof, windows and doors, then first-fix services (plumbing, electrics, mechanical ventilation, heating), insulation, plasterboard, second-fix services, decorating and finish. The team's lead has been laying bricks for over 30 years, so the masonry detail on openings, plinths and feature work goes through someone who knows the trade end-to-end.

How Long Does a Home Extension Take?

Build duration depends on the scope. A single-storey rear extension typically runs two to four months from groundworks to handover. A double-storey extension or wraparound runs longer, three to six months depending on size and finish. Larger extensions with significant glazing, complex roof structures, kitchen fit-out or bathroom inclusion sit at the longer end.

Planning permission timelines are separate and sit outside our control. A straightforward permitted development build can start within weeks of design completion. A full planning application typically adds eight to twelve weeks before any work begins on site. We factor planning realism into the start-date conversation rather than promising dates we can't control.

Home Extensions Across NW London

We build extensions for clients in Ruislip, Pinner, Northwood, Uxbridge, Harrow, Watford, Rickmansworth, Amersham, Ealing and Beaconsfield, across NW London and the western Bucks border.