House Extension Drawings in Croydon

Which postcode districts around Croydon do we cover for house extension work?

Every Croydon postcode district we draw in, the stock that dominates it and the authority that validates a house extension there. Croydon fees below are the statutory England rates for 2026, not house extension estimates.

What changes about a house extension in each part of Croydon?

Roof pitch, wall build-up and plot depth change every few Croydon streets, and each one changes what a house extension can achieve at that address.

• Purley (CR8) — house extension work in Purley means 1930s semi-detached, edwardian villas. Purley is 1930s semi-detached, Edwardian villas. Edwardian plots here are wider throughout CR8. Croydon Council decides the Purley application, and Purley Way anchors the Purley location plan.
• Coulsdon (CR5) — a house extension in Coulsdon starts from 1930s semi-detached, and Coulsdon reads as 1930s semi-detached, Edwardian villas. 1930s semis here have the deepest rear gardens in the area in CR5. Croydon Council assesses Coulsdon house extensions against its own Coulsdon character guidance, and the location plan we draw for Coulsdon references Coulsdon South.
• Addiscombe (CR0) — Edwardian terraces defines Addiscombe, where edwardian terraces set what a house extension can do. Edwardian plots here are wider across CR0. Any Addiscombe house extension is validated by Croydon Council, with Addiscombe Road the usual Addiscombe reference point on the site plan.
• Shirley (CR0) — house extension work in Shirley means 1930s semi-detached. Shirley is 1930s semi-detached. 1930s semis here have the deepest rear gardens in the area throughout CR0. Croydon Council decides the Shirley application, and Shirley Park anchors the Shirley location plan.
• Selhurst (SE25) — house extension work in Selhurst means edwardian terraces. Selhurst is Edwardian terraces. Edwardian plots here are wider throughout SE25. Croydon Council decides the Selhurst application, and Selhurst Park anchors the Selhurst location plan.
• Croydon (CR0) — house extension work in Croydon means edwardian terraces, post-war flats. Croydon is post-war centre, Edwardian residential ring. Edwardian plots here are wider throughout CR0. Croydon Council decides the Croydon application, and Whitgift Centre anchors the Croydon location plan.
• Crystal Palace (SE19) — Victorian villas, hill character defines Crystal Palace, where victorian villas, edwardian terraces set what a house extension can do. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage across SE19. Any Crystal Palace house extension is validated by Croydon Council, with Crystal Palace Park the usual Crystal Palace reference point on the site plan.

Does Croydon planning policy restrict a house extension?

Croydon conservation designations: there are 24 across Croydon Council, Purley, Shirley Park, South Norwood among them. Designation costs a Croydon owner the permitted-development route: a house extension then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Old Coulsdon is the Croydon designation that most often changes a house extension design.

No blanket Article 4 over Croydon: Croydon Council has not withdrawn permitted development across Croydon, so a house extension outside a Croydon conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a SE19 owner wants on file.

Croydon housing stock: Victorian villas in Upper Norwood and Crystal Palace; Edwardian terraces in Thornton Heath and Selhurst; 1930s semi-detached in Purley and Coulsdon; post-war in Croydon central. Large, mixed-density outer borough; permissive in outer areas; heritage controls in conservation pockets; major regeneration in central Croydon. Read that before choosing a house extension route in Croydon — construction, not postcode, sets what is achievable. Croydon Council charges £548 for a householder application and has 8 weeks to determine it.

What happens if a Croydon property sits on a boundary?

• Sutton — cross the Croydon boundary and Sutton Council takes the house extension instead, applying 17 conservation areas of its own around SM1. We re-price house extensions at the Croydon edge because Sutton policy and Croydon policy rarely align on house extension depth.
• Merton — cross the Croydon boundary and Merton Council takes the house extension instead, applying 28 conservation areas of its own around SW16. We re-price house extensions at the Croydon edge because Merton policy and Croydon policy rarely align on house extension depth.
• Lambeth — the Lambeth boundary runs against Croydon, so a house extension a street from Croydon is decided by Lambeth Council instead. Lambeth runs 64 conservation areas across SE1 and its neighbours, which is why house extensions priced for Croydon are re-checked against Lambeth policy whenever the Croydon address sits on that edge.
• Bromley — cross the Croydon boundary and Bromley Council takes the house extension instead, applying 48 conservation areas of its own around BR1. We re-price house extensions at the Croydon edge because Bromley policy and Croydon policy rarely align on house extension depth.

Sources for this Croydon house extension page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.