Greater London · CR0, CR2, CR5, CR7, CR8
Foundations in Croydon
Foundations are the below-ground concrete structure that transfers the load of a building safely into the ground, with the type — strip, trench-fill or raft — and depth determined by ground conditions, nearby trees and the load of the structure above.
In Croydon, that covers Purley, Coulsdon, South Croydon, Addiscombe, Selsdon, Shirley, Thornton Heath, Sanderstead, Waddon. Croydon combines a dense town centre and tower-block skyline with substantial suburban housing across Purley, Coulsdon, Addiscombe and Shirley, plus the Victorian and Edwardian terraces closer to South Croydon and Thornton Heath. Its position on the A23/M23 corridor puts it within easy reach of our Surrey and Sussex teams, and it borders Sutton, Bromley and Reigate & Banstead.
Coverage
Areas we cover in Croydon for foundations
Property styles in Croydon
Housing ranges from Victorian and Edwardian terraces near the town centre and South Croydon, through interwar semis across Addiscombe, Shirley and Thornton Heath, to larger detached houses in Purley, Coulsdon and Sanderstead. Loft conversions and rear extensions are common on the terraced and semi-detached stock, while the larger plots further south suit more substantial extension and outbuilding projects.
Planning considerations
Croydon Council (London Borough of Croydon) is the local planning authority. Several residential areas, including parts of South Croydon, Coulsdon and Addiscombe, are conservation areas, and parts of the borough's southern edge fall within the Metropolitan Green Belt, which affects extensions and new structures. As with all London boroughs, permitted development rights can also be more restricted on flats and some converted properties.
How it works
Our foundations process
- 01
Site investigation
Checking ground conditions, trial pits where needed, and proximity to trees, drains and existing foundations.
- 02
Design and approval
Agreeing the foundation type and depth, with Building Control approval before excavation for most projects.
- 03
Excavation and formwork
Digging to the approved depth and forming edges ready for concrete.
- 04
Concrete pour and inspection
Pouring concrete to the specified mix and depth, with a Building Control inspection of the open trench beforehand.
Also in this area
Other services we provide in Croydon
Nearby coverage
Foundations in nearby areas
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FAQs
Foundations in Croydon: FAQs
Do you provide foundations across all of Croydon?
Yes, we cover the CR0, CR2, CR5, CR7 and CR8 postcode areas in full, including Purley, Coulsdon, South Croydon, Addiscombe, Selsdon, Shirley, Thornton Heath, Sanderstead, Waddon.
How deep do foundations need to be?
Depth depends on ground conditions, the load of the structure and proximity to trees or drains — a straightforward strip foundation might be around 1m deep, but clay soils near mature trees can require significantly deeper trench-fill foundations. This is confirmed by site investigation and agreed with Building Control.
Does Building Control need to inspect the foundations before concrete is poured?
Yes. An open-trench inspection is a standard Building Control stage, carried out once excavation is complete and before concrete is poured, to confirm the ground conditions and depth match what was approved.
Do you cover all of Croydon, including Purley and Coulsdon?
Yes, we work across the CR0, CR2, CR5, CR7 and CR8 postcode areas, including the town centre, Purley, Coulsdon, South Croydon, Addiscombe, Selsdon, Shirley, Thornton Heath and Sanderstead.
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Last reviewed 2026-07-28.