Altering a period home in Hounslow's conservation areas

Where in Hounslow does a conservation area application actually get determined?

Below: the Hounslow postcode districts on our books, the housing typical of each, and which council validates a conservation area application at that address. Fees quoted are England's statutory rates for 2026, not our charges.

Which Hounslow neighbourhoods suit a conservation area application best?

Wall build-up, roof pitch and plot depth alter from one Hounslow street to the next, and each alteration changes what a conservation area application can achieve at that address.

• Chiswick (W4) — Edwardian villas, conservation defines Chiswick, where edwardian villas, victorian terraces set what a conservation area application can do. Most applications on these Victorian streets are householder applications validated on existing and proposed plans across W4. Any Chiswick conservation area application is validated by Hounslow Council, with Chiswick House the usual Chiswick reference point on the site plan.
• Brentford (TW8) — conservation area application work in Brentford means georgian fragments, victorian terraces, new-build. Brentford is Georgian fragments, riverside new-build. Applications on Georgian stock here almost always need a heritage statement alongside the drawings throughout TW8. Hounslow Council decides the Brentford application, and Kew Bridge anchors the Brentford location plan.
• Isleworth (TW7) — a conservation area application in Isleworth starts from georgian and victorian terraces, and Isleworth reads as Georgian and Victorian terraces. Applications on Georgian stock here almost always need a heritage statement alongside the drawings in TW7. Hounslow Council assesses Isleworth conservation area applications against its own Isleworth character guidance, and the location plan we draw for Isleworth references Old Isleworth.
• Hounslow (TW3) — 1930s semi-detached, post-war flats defines Hounslow, where 1930s semi-detached, post-war flats set what a conservation area application can do. On these 1930s semis the prior approval route often replaces a full application across TW3. Any Hounslow conservation area application is validated by Hounslow Council, with Hounslow Central the usual Hounslow reference point on the site plan.
• Feltham (TW13) — a conservation area application in Feltham starts from 1930s semi-detached, post-war estates, and Feltham reads as 1930s semi-detached, post-war estates. On these 1930s semis the prior approval route often replaces a full application in TW13. Hounslow Council assesses Feltham conservation area applications against its own Feltham character guidance, and the location plan we draw for Feltham references Feltham station.
• Hanworth (TW13) — conservation area application work in Hanworth means 1930s semi-detached. Hanworth is 1930s semi-detached. On these 1930s semis the prior approval route often replaces a full application throughout TW13. Hounslow Council decides the Hanworth application, and Hanworth Park anchors the Hanworth location plan.
• Turnham Green (W4) — Edwardian villas, conservation defines Turnham Green, where edwardian villas set what a conservation area application can do. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed across W4. Any Turnham Green conservation area application is validated by Hounslow Council, with Turnham Green the usual Turnham Green reference point on the site plan.

What local planning policy applies to a conservation area application in Hounslow?

Hounslow conservation designations: the council's own list runs to 30, Chiswick, Bedford Park and Old Isleworth among them. Designation takes the permitted-development route off the table. The work then needs a householder application at £548, decided over 8 weeks, where an undesignated address could have gone the prior approval route at £249 in 6. Which designation applies to you is an address question, so check yours on the map before committing to a design. The borough's conservation areas are concentrated in the east, and a good deal of western Hounslow carries none at all.

No blanket Article 4 over Hounslow: Hounslow Council has not withdrawn permitted development across Hounslow, so a conservation area application outside a Hounslow conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a W4 owner wants on file.

Hounslow housing stock: 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. Read that before choosing a conservation area application route in Hounslow — construction, not postcode, sets what is achievable.

Who decides a conservation area application on the edge of Hounslow?

• Hillingdon — cross the Hounslow boundary and Hillingdon Council takes the conservation area application instead, applying 29 conservation areas of its own around HA4. We re-price conservation area applications at the Hounslow edge because Hillingdon policy and Hounslow policy rarely align on conservation area application depth.
• Ealing — cross the Hounslow boundary and Ealing Council takes the conservation area application instead, applying 30 conservation areas of its own around W3. We re-price conservation area applications at the Hounslow edge because Ealing policy and Hounslow policy rarely align on conservation area application depth.
• Hammersmith and Fulham — the Hammersmith and Fulham boundary runs against Hounslow, so a conservation area application 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 conservation area applications 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 conservation area application instead, applying 72 conservation areas of its own around SW13. We re-price conservation area applications at the Hounslow edge because Richmond upon Thames policy and Hounslow policy rarely align on conservation area application depth.

Sources for this Hounslow conservation area application 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.