Rear Dormer Loft Conversion Drawings in Croydon

Where in Croydon does a rear dormer actually get determined?

Each Croydon postcode district we work in, the stock it is mostly built from, and which authority validates a rear dormer at an address there. The money column is the statutory England application fee set for 2026: what the council charges to consider an application, not what a dormer costs to build.

How does a rear dormer differ street by street across Croydon?

Pitch, wall build-up and plot depth shift street by street in this borough, and no single period owns its 168,250 dwellings — 19.2% predate 1900, 17.4% went up in the 1930s, and 10.9% have been built since 2010, on the VOA stock table for March 2025.

• South Norwood (SE25) — Victorian terraces defines South Norwood, where victorian terraces set what a rear dormer can do. Full-width rear dormers on Victorian terraces here are the default across SE25. Any South Norwood rear dormer is validated by Croydon Council, with South Norwood Lake the usual South Norwood reference point on the site plan.
• Thornton Heath (CR7) — a rear dormer in Thornton Heath starts from edwardian terraces, and Thornton Heath reads as Edwardian terraces. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses in CR7. Croydon Council assesses Thornton Heath rear dormers against its own Thornton Heath character guidance, and the location plan we draw for Thornton Heath references Thornton Heath station.
• Purley (CR8) — 1930s semi-detached, Edwardian villas defines Purley, where 1930s semi-detached, edwardian villas set what a rear dormer can do. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses across CR8. Any Purley rear dormer is validated by Croydon Council, with Purley Way the usual Purley reference point on the site plan.
• Coulsdon (CR5) — a rear dormer in Coulsdon starts from 1930s semi-detached, and Coulsdon reads as 1930s semi-detached, Edwardian villas. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis in CR5. Croydon Council assesses Coulsdon rear dormers 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 rear dormer can do. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses across CR0. Any Addiscombe rear dormer is validated by Croydon Council, with Addiscombe Road the usual Addiscombe reference point on the site plan.
• Shirley (CR0) — 1930s semi-detached defines Shirley, where 1930s semi-detached set what a rear dormer can do. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis across CR0. Any Shirley rear dormer is validated by Croydon Council, with Shirley Park the usual Shirley reference point on the site plan.
• Selhurst (SE25) — a rear dormer in Selhurst starts from edwardian terraces, and Selhurst reads as Edwardian terraces. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses in SE25. Croydon Council assesses Selhurst rear dormers against its own Selhurst character guidance, and the location plan we draw for Selhurst references Selhurst Park.

How do conservation areas and Article 4 affect a rear dormer in Croydon?

Conservation areas covering Croydon: Croydon Council runs 24, and Purley, Shirley Park, South Norwood are the ones Croydon owners meet most. A rear dormer inside a Croydon conservation area loses permitted development, so the Croydon submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In South Norwood a rear dormer is judged on the street elevation first.

Article 4 and your Croydon rear dormer: Croydon Council has made no borough-wide direction, so permitted development for a rear dormer in Croydon generally survives outside Croydon conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SE19 owner records that a rear dormer was lawful.

What Croydon is built from: 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. That mix decides the rear dormer route in Croydon more than the postcode does, and it is what a Croydon Council case officer reads first. A householder application costs £548 paid to Croydon Council direct, with 8 weeks to a decision once validated.

Which neighbouring authorities border Croydon?

• Sutton — the Sutton boundary runs against Croydon, so a rear dormer a street from Croydon is decided by Sutton Council instead. Sutton runs 17 conservation areas across SM1 and its neighbours, which is why rear dormers priced for Croydon are re-checked against Sutton policy whenever the Croydon address sits on that edge.
• Merton — adjoining Croydon, with 28 conservation areas centred on SW16. A rear dormer on the far side of the Croydon line is determined by Merton Council, so the Croydon quote for rear dormers is checked against Merton guidance before it is issued.
• Lambeth — cross the Croydon boundary and Lambeth Council takes the rear dormer instead, applying 64 conservation areas of its own around SE1. We re-price rear dormers at the Croydon edge because Lambeth policy and Croydon policy rarely align on rear dormer depth.
• Bromley — cross the Croydon boundary and Bromley Council takes the rear dormer instead, applying 48 conservation areas of its own around BR1. We re-price rear dormers at the Croydon edge because Bromley policy and Croydon policy rarely align on rear dormer depth.

Sources for this Croydon rear dormer 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.