Building work in Coulsdon: area guide

This is our area guide to building work in Coulsdon (CR5, Croydon): the housing, the council rules that apply (Croydon Council for planning) and every service we offer here. For whole-house refurbishment go to Home renovation in Coulsdon.

The semi that fills so much of Coulsdon, 1930s or post-war, was built to a plan that no longer matches how the ground floor gets used. A front room, a back room, a small kitchen at the rear and a hall running between them, with the chimney breast usually in the wall shared with the attached house, sometimes on the flank, and a garden that stretches away towards Farthing Downs and Happy Valley Park. Many CR5 jobs start by rethinking that arrangement, and which wall is in the way decides which job it is. We appoint the structural engineer and coordinate Croydon Council building control throughout Coulsdon.

Of the 7,540 homes the valuation list records in Coulsdon, 8% were built before 1919, 30% between the wars and 62% since 1945; 27% are flats and 73% are houses. VOA Council Tax stock of properties, March 2025, for Coulsdon and Old Coulsdon. Counts rounded by the VOA.

Opening up the back of a Coulsdon semi is a steel job first

The wall between the back room and the kitchen is the one people want gone, and in a house of this type it usually carries the floor above and sometimes roof load brought down through a partition. That makes it a load-bearing wall removal job: a beam sized by a structural engineer, bearing onto padstones set into masonry that has been exposed and checked, with temporary support throughout. Where the rear wall is also coming out for new work at the back, both openings are designed as one structural arrangement under RSJ installation.

The chimney breast, usually built into the wall you share with the attached house, is a chimney breast removal job, and it complicates the picture more than people expect. Where it is in that shared wall, you serve party wall notice on your neighbour before the work starts. It often serves both floors, so taking out the ground floor section leaves masonry above needing support from a steel beam, or gallows brackets only where the engineer and building control accept them. If the stack is redundant from top to bottom, removing the lot and making the roof good is frequently the cleaner answer. Either way it is designed and inspected, never knocked out over a weekend, and the stack is never left resting on a partly removed pier at any stage.

Tired 1970s additions in Coulsdon are a rebuild, not a patch

A high proportion of Coulsdon houses already carry an addition from the 1970s or 1980s: a flat roofed rear addition, a lean to conservatory, or a garage brought into the house without much insulation. These reach the end of their life together, with failed flat roof coverings, cold single skin walls and foundations that would not satisfy today's standards. Replacing rather than patching is usually the better investment, and it is a house extension job: the new work is tied into sound existing structure instead of bolted onto it, which is what makes it feel original.

New work on these plots has room to be generous, and the deep rear gardens mean access down the side of the house for materials and a skip on the drive without a highway permit, keeping rubble out of your hallway. Foundation depth is dictated by the ground and by nearby trees and inspected in open trench, drainage is diverted and tested before backfill, and insulation is inspected before it is covered. We book each of those visits with Croydon Council building control and attend them on site.

Where to go next for work in Coulsdon: house extensions in Coulsdon, the Croydon area guide, building work in Purley, building work in Wallington and How to Choose a Builder.