Croydon is outer south London's largest borough, spanning from the suburban streets of Coulsdon and Purley to the town centre regeneration zones. For residential extensions, many parts of Croydon benefit from full permitted development rights — conservation area coverage is significant in some areas (Old Coulsdon, Addiscombe, Croham Hurst) but the majority of the residential borough is not designated. The council is also notable for ongoing town centre regeneration.
Common projects that may be straightforward when they fit within PD limits and local constraints.
These are the usual reasons planning permission becomes more likely in Croydon.
The biggest drivers of approval are the exact proposal (dimensions and design) and the exact site constraints (designation, conditions, neighbour impacts). Use borough context as a starting point, then validate it with address-level checks and nearby precedents.
Projects that stay modest in size, match materials, and avoid obvious neighbour impacts are more likely to be straightforward — even before you consider borough-specific policies.
Conservation areas, listed buildings, Article 4 directions, flood risk and TPOs can flip the answer. Address-level checks stop you wasting money on the wrong scheme.
The fastest signal is what the council has approved or refused on comparable streets nearby. Precedent does not guarantee success, but it helps you shape a lower-risk design.
Councils rarely refuse the "idea" of an extension or loft conversion — refusals are usually about scale, design, neighbour impacts, and policy/designation conflicts. When you run a check, CanUBuild shows nearby approvals and refusals so you can see what has worked locally.
An invalid application cannot be registered. Use this checklist to ensure your submission is complete before you pay the fee.
Requirements can change — always verify the current validation checklist on the Croydon Council website before submitting.
Search the address, choose your project type, and get an answer based on permitted development rules, local constraints, and nearby precedent decisions.
Yes — the majority of Croydon's residential streets are not within a designated conservation area, meaning many house extensions can proceed under permitted development without a formal planning application.
Side extensions can fall within PD but are more constrained than rear extensions — the extension must not exceed half the width of the original house, and corner properties have additional restrictions. If the property is in a conservation area or the extension would create a semi-detached effect on a detached house, planning permission is likely needed.
Yes — TPOs (Tree Preservation Orders) protect specific trees across the borough. Croydon also has a number of significant open spaces. The council's TPO map is available on the planning portal. Works to or near a TPO tree require council consent.
The town centre has been the focus of major regeneration proposals including the failed Westfield scheme. This affects major development sites but is not relevant for typical domestic extensions in residential streets.
Last reviewed: 2026-03 · This guide is for general information only. Always verify with Croydon Council or a qualified planning consultant before making decisions.