Planning and building regulation drawings in Hounslow (TW3)
Hounslow's housing runs in layers. Around the town centre the streets are interwar and post-war terraces and semis. The older pocket is Spring Grove, where substantial Victorian and Edwardian detached and semi-detached villas stand in generous plots with mature planting. Spring Grove Road, Spring Grove Crescent, Eversley Crescent and London Road are among the district's streets.
- MCIAT chartered technologists
- London Borough of Hounslow granted 75% of 704 householder applications
- Drawings in about 7 days
Different streets raise different questions. The villa plots are generous, but the conservation area governs how far they can change. The interwar and post-war terraces and semis around the centre share walls with their neighbours, so party wall notices come into rear and side work there.
The important thing to know about Spring Grove is what it does not have. The conservation area carries no Article 4 direction, because Hounslow's householder Article 4 controls apply only to Bedford Park and Gunnersbury Park. That does not make it a free-for-all. Conservation-area rules still apply, so demolition and frontage changes are controlled, and the building lines and mature planting that give the villa streets their character are protected. Trees in a conservation area also need notice to the council before most works.
Hounslow's wider constraints also reach the district. The borough has Article 4 directions on converting houses to HMOs in some parts, and aircraft noise is a consideration toward Heathrow in the west of the borough, so we check whether it bears on your address. We check what applies to your address before any line is drawn.
Planning in Hounslow: what to know before you apply
Hounslow decides householder applications on design, materials and the character of the street, and in its conservation areas it expects a closer fit with what is already there. Spring Grove has no householder Article 4 direction, so standard conservation-area rules govern what is and is not permitted development: roof enlargements, side extensions and rear extensions of more than one storey need a full application, and demolition or frontage changes are scrutinised. Outside the conservation area, houses can use permitted development if they stay within its limits, though flats cannot. The borough's HMO directions in parts of Hounslow matter if three to six unrelated sharers are planned. We prepare scaled plans, a location plan and the ownership certificate or notice the council needs to validate.
Applications are decided by London Borough of Hounslow — its planning pages.
Does your Hounslow project need planning permission?
Hounslow (TW3) in numbers
What London Borough of Hounslow has decided, and what TW3 is built of — the two facts that shape every job here.
Householder planning decisions — London Borough of Hounslow
Hounslow (TW3) applications are decided by London Borough of Hounslow; these are its published householder figures for the last four quarters.
| Householder applications decided2025 Q2 to 2026 Q1 | 704 |
|---|---|
| Granted | 526 |
| Refused | 178 |
| Grantedof 704 decisions · England 90% | 75% |
| Decided within 8 weeksof 404, excluding prior approvals | 97% |
Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.
Permitted development prior approvals — London Borough of Hounslow
How the larger-home-extension route has fared with London Borough of Hounslow, which decides TW3 notifications.
| Larger home extension prior approvals — not required2024 Q2 to 2026 Q1 | 263 |
|---|---|
| Prior approval granted | 54 |
| Prior approval refused | 138 |
| Grantedof 192 determined | 28% |
Source: Ministry of Housing, Communities and Local Government (PS1 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.
Planning appeals — London Borough of Hounslow
Refusals in TW3 can be appealed to the Planning Inspectorate; this is London Borough of Hounslow's householder appeal record.
| Householder appeals determined2021–2026 | 352 |
|---|---|
| Allowed | 175 |
| Allowedof 352 · England 36% | 50% |
Source: Planning Inspectorate appeals casework. Open Government Licence v3.0 Extracted 2026-09-22.
Conservation areas and Article 4 directions — London Borough of Hounslow
Register counts for London Borough of Hounslow. A count describes what the council has published, never a rank against another council.
| Conservation areas in the register28 dated, 1968–2014 | 43 |
|---|---|
| Article 4 directions in the register | 3 |
| Areas covered by an Article 4 direction | 3 |
Source: MHCLG Planning Data Platform. Open Government Licence v3.0 Extracted 2026-09-22.
What TW3 is built of
Residential building form across Hounslow (TW3), from 300 classified buildings — the fact that decides party walls, side returns and loft headroom before any policy does.
| Attached on more than one side | 32% |
|---|---|
| Attached on one side | 62% |
| Detached | 5% |
| Median building footprint | 65 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 2.02 |
| Buildings classified | 300 |
Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-09-22.
- Day 0Measured survey of your Hounslow property — or your existing plans if you have them.
- About 7 daysDrawings issued for your approval. Free redraws until you are happy.
- SubmissionWe validate against London Borough of Hounslow’s checklist and submit on your behalf.
- Council: 8-week targetHouseholder applications carry an 8-week statutory target. London Borough of Hounslow decided 97% of 404 recent householder applications inside it.
Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.
Streets and neighbourhoods in TW3
Nearby postcode districts
Hounslow (TW3) — FAQs
Is Spring Grove covered by an Article 4 direction?+
Does Heathrow noise affect an extension in Hounslow?+
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