Planning Drawings · TW7 Isleworth
Hounslow protects the Isleworth Riverside and Spring Grove conservation areas; much of the rest of TW7 is standard suburban householder territory.
This page covers one part of the borough. For the full picture — fees, timelines and the council's current position — read planning drawings in Hounslow.
Planning drawings for Isleworth start by establishing whether your scheme is Permitted Development, needs a Lawful Development Certificate, or full planning from Hounslow Council. On TW7's victorian and edwardian terraces and inter-war semis, the recurring questions are roof additions, rear and side-return extensions, and alterations within Isleworth Riverside (Church Street), Spring Grove. We draw existing and proposed plans, elevations and a site location plan to the council's validation checklist for Isleworth, Osterley, Spring Grove, Worton fringe.
Across Isleworth, Osterley, Spring Grove, Worton fringe in TW7, the dominant property is victorian and edwardian terraces and inter-war semis around isleworth, with riverside houses and some larger osterley villas. That stock shapes what planning permission drawings looks like here: the right approach for a period terrace differs from a mansion-block flat or a new-build, and Hounslow Council judges each on design quality and neighbour impact. We survey the specific Isleworth property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the TW7 streetscape.
Housing stock in TW7: Victorian and Edwardian terraces and inter-war semis around Isleworth, with riverside houses and some larger Osterley villas.
Within the district: Isleworth, Osterley, Spring Grove, Worton fringe.
Streets we know in TW7: the Spring Grove streets, the Church Street riverside and the inter-war roads around Osterley. Each road has its own building line, boundary treatment and precedent that Hounslow Council weighs when assessing a planning permission drawings scheme.
Conservation areas: Isleworth Riverside (Church Street), Spring Grove. Inside these, most external work needs full planning and a Heritage Statement.
Getting around TW7: Isleworth and Syon Lane on South Western Railway, plus Osterley on the Piccadilly line.
Property values: price-paid returns for January to December 2025 put the typical TW7 sale at £497,750, a shade under the £500,000 mark and 0.4% down on 2024.
Borough character: Chiswick is one of west London's most conservation-controlled areas; outer Hounslow is permissive suburban.
A chartered technologist visits and laser-measures every room. Typically 60–90 minutes on site.
Drafted in Revit or AutoCAD at 1:100 or 1:50. Fully annotated and council-ready.
Unlimited revisions until you approve. Shadow studies for committee-sensitive applications.
Site location plan, block plan, Design & Access Statement where required.
We lodge the application with Hounslow Council and pay statutory fees directly.
Every officer query, consultation response and amendment handled through to determination.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Yes. The Victorian and Edwardian terraces and inter-war semis around Isleworth and Osterley suit side-return, rear and loft extensions, much of it within Permitted Development outside the conservation areas, confirmed with a Lawful Development Certificate. We confirm the route and draw to Hounslow's checklist.
Yes — the Isleworth Riverside (Church Street) and Spring Grove conservation areas protect the historic riverside and the Victorian villa character, so external changes there need full planning with a Heritage Statement. We design sympathetically and handle the application through Hounslow's conservation officers.
Usually yes on terraces and semis outside the conservation areas — a rear dormer or hip-to-gable within the volume allowance, confirmed by a Lawful Development Certificate. Inside the riverside or Spring Grove designations, roof changes are controlled. We confirm which applies to your TW7 road.
With TW7 houses around £600,000-£900,000 and good links to Waterloo and the Piccadilly line at Osterley, a rear or loft extension adds family space worth above the build and drawing cost.
Hounslow Council charges its own statutory application fee (currently £548 for a householder planning application, £610 for a full application). We quote the drawings as one fixed price and the free site survey covers every TW7 address.
For a TW7 project across Isleworth, Osterley, Spring Grove, Worton fringe, expect roughly 3–4 weeks from instruction to submission: week 1 the measured survey, weeks 2–3 the drawings and your revisions, then validation and the statutory determination by Hounslow Council (8 weeks for a householder application). We carry the Isleworth application through every officer query to the decision.
Isleworth (TW7) sits primarily in Hounslow, so applications are decided by Hounslow Council. Conservation areas within TW7 include Isleworth Riverside (Church Street), Spring Grove, where full planning and a Heritage Statement are required. We confirm the planning route for your exact address before quoting.
Almost always. Any structural work behind planning permission drawings in Isleworth — new openings, steel beams, loft floors, foundations — needs Building Regulations approval covering structure (Part A), fire escape (Part B) and insulation (Part L), submitted to Hounslow Council Building Control or an approved inspector. On TW7's typically terraced and semi-detached stock, a Party Wall notice to adjoining neighbours is normally required before the steelwork. We coordinate both as part of the Complete package.
In value terms, yes. The bigger risk is an unapproved or non-compliant scheme — which is why council-ready drawings and a clean Building Control sign-off matter on TW7 homes.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every TW7 postcode district we draw in, the stock that dominates it and the authority that validates a planning drawing set there. TW7 fees below are the statutory England rates for 2026, not planning drawing set estimates.
| Postcode | Area | Dominant stock | What it means for a planning drawing set |
|---|---|---|---|
| TW7 | Isleworth | Georgian and Victorian terraces | Isleworth sits wholly inside TW7, so Hounslow Council validates every planning drawing set submitted from an TW7 address. |
| W4 | Chiswick / Bedford Park | Arts & Crafts villas (listed) | Adjoining district to TW7, also inside Hounslow for planning drawing set purposes. |
| TW3 | Hounslow | 1930s semi-detached, post-war flats | Adjoining district to TW7, also inside Hounslow for planning drawing set purposes. |
| TW4 | Hounslow West | mixed stock | Adjoining district to TW7, also inside Hounslow for planning drawing set purposes. |
| TW5 | Heston / Cranford | mixed stock | Adjoining district to TW7, also inside Hounslow for planning drawing set purposes. |
Roof pitch, wall build-up and plot depth change every few TW7 streets, and each one changes what a planning drawing set can achieve at that address.
TW7 (Isleworth) conservation designations: there are 30 across Hounslow Council, Old Isleworth, Brentford, Chiswick among them. Designation costs a TW7 (Isleworth) owner the permitted-development route: a planning drawing set then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Brentford is the TW7 (Isleworth) designation that most often changes a planning drawing set design.
TW7 (Isleworth) permitted development status: there is no borough-wide direction from Hounslow Council, so a planning drawing set at a TW7 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a TW7 (Isleworth) sale to argue it later.
What TW7 (Isleworth) 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 planning drawing set route in TW7 (Isleworth) 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.
Sources for this TW7 planning drawing set 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.
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