Rear Dormer Loft Conversion Drawings in Hounslow

Which Hounslow postcodes does this rear dormer service cover?

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

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

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

• Chiswick (W4) — a rear dormer in Chiswick starts from edwardian villas, victorian terraces, and Chiswick reads as Edwardian villas, conservation. Full-width rear dormers on Victorian terraces here are the default in W4. Hounslow Council assesses Chiswick rear dormers against its own Chiswick character guidance, and the location plan we draw for Chiswick references Chiswick House.
• Brentford (TW8) — a rear dormer in Brentford starts from georgian fragments, victorian terraces, new-build, and Brentford reads as Georgian fragments, riverside new-build. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent in TW8. Hounslow Council assesses Brentford rear dormers against its own Brentford character guidance, and the location plan we draw for Brentford references Kew Bridge.
• Isleworth (TW7) — a rear dormer in Isleworth starts from georgian and victorian terraces, and Isleworth reads as Georgian and Victorian terraces. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent in TW7. Hounslow Council assesses Isleworth rear dormers against its own Isleworth character guidance, and the location plan we draw for Isleworth references Old Isleworth.
• Hounslow (TW3) — rear dormer work in Hounslow means 1930s semi-detached, post-war flats. Hounslow is 1930s semi-detached, post-war flats. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis throughout TW3. Hounslow Council decides the Hounslow application, and Hounslow Central anchors the Hounslow location plan.
• Feltham (TW13) — 1930s semi-detached, post-war estates defines Feltham, where 1930s semi-detached, post-war estates set what a rear dormer can do. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis across TW13. Any Feltham rear dormer is validated by Hounslow Council, with Feltham station the usual Feltham reference point on the site plan.
• Hanworth (TW13) — rear dormer work in Hanworth means 1930s semi-detached. Hanworth is 1930s semi-detached. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis throughout TW13. Hounslow Council decides the Hanworth application, and Hanworth Park anchors the Hanworth location plan.
• Turnham Green (W4) — a rear dormer in Turnham Green starts from edwardian villas, and Turnham Green reads as Edwardian villas, conservation. 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 W4. Hounslow Council assesses Turnham Green rear dormers against its own Turnham Green character guidance, and the location plan we draw for Turnham Green references Turnham Green.

Does Hounslow planning policy restrict a rear dormer?

How designation changes a Hounslow rear dormer: Hounslow Council maintains 30 conservation areas, including Brentford, Chiswick, Bedford Park. Inside any of them a Hounslow rear dormer cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Bedford Park sets the tone for Hounslow casework.

Hounslow permitted development status: there is no borough-wide direction from Hounslow Council, so a rear dormer at a W4 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Hounslow sale to argue it later.

What Hounslow is built from: Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford. Chiswick is one of west London's most conservation-controlled areas; outer Hounslow is permissive suburban. That mix decides the rear dormer route in Hounslow more than the postcode does, and it is what a Hounslow Council case officer reads first. A householder application costs £548 paid to Hounslow Council direct, with 8 weeks to a decision once validated.

Which neighbouring authorities border Hounslow?

• Hillingdon — cross the Hounslow boundary and Hillingdon Council takes the rear dormer instead, applying 29 conservation areas of its own around HA4. We re-price rear dormers at the Hounslow edge because Hillingdon policy and Hounslow policy rarely align on rear dormer depth.
• Ealing — the Ealing boundary runs against Hounslow, so a rear dormer a street from Hounslow is decided by Ealing Council instead. Ealing runs 30 conservation areas across W3 and its neighbours, which is why rear dormers priced for Hounslow are re-checked against Ealing policy whenever the Hounslow address sits on that edge.
• Hammersmith and Fulham — the Hammersmith and Fulham boundary runs against Hounslow, so a rear dormer a street from Hounslow is decided by Hammersmith & Fulham Council instead. Hammersmith and Fulham runs 45 conservation areas across W6 and its neighbours, which is why rear dormers priced for Hounslow are re-checked against Hammersmith and Fulham policy whenever the Hounslow address sits on that edge.
• Richmond upon Thames — cross the Hounslow boundary and Richmond Council takes the rear dormer instead, applying 72 conservation areas of its own around SW13. We re-price rear dormers at the Hounslow edge because Richmond upon Thames policy and Hounslow policy rarely align on rear dormer depth.

Sources for this Hounslow 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.