17 Northumberland Avenue,Isleworth,TW7 5HZ Data via plota.co.uk
Proposal
Certificate of lawfulness for the proposed erection of a rear roof extension with three roof windows to the front of the house. Data via plota.co.uk
Application progress
This application is under consideration - no decision has been issued yet. Plota predicts a decision around 8 Nov 2026, from Hounslow's recent extensions.
Documents 5
Statements & assessments 1
Plans & drawings 3
Site constraints 3
Checked on 18 September 2026. Historic England, the Environment Agency, Natural England and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
Sales history 1
Last sold for £188,500 in January 2000. Terraced house, freehold.
Sale prices from HM Land Registry's price paid record, matched to this application by its address.
Every application in Hounslow - and every UK council - as a live feed, an API, or a bulk CSV export.
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Important details
Decision outlook
Day 19 of the 56-day target. Hounslow usually decides extensions by day 54.
Plota live figures for extensions decided by Hounslow in the last twelve months, from validation. Hounslow decision record →
Consultation & key dates
- Consultation
- 15 Sept 2026
- Statutory expiry
- 10 Nov 2026
Historical activity at this location
25 nearby applications on record - archival context, not part of the live application.
Nearby activity
Hounslow is slower than most councils at deciding householder applications, ranking #203 out of 296. 47% of applications have the time limit extended, above the 41% national average. Hounslow is also one of the strictest councils - it refuses more householder applications than almost any other, with only 75% approved vs 90% nationally.
Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use
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17 Northumberland Avenue,Isleworth,TW7 5HZ
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