18 Blackwater Avenue, Colchester CO4 3UY

261689Full (8 Week Determination)Approved

Approved on 10 September 2026

Council decision: Tree Consent

Approximate site (title boundary)

Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

Proposed garage conversion with front and rear facing dormer windows.

Received: 15 September 2026
Council: Colchester City Council
Ward: St Anne's & St John's

ReceivedReceived15 Sep
ValidatedValidated15 Sep
Consult.Consultation7 Oct
TargetTarget Date10 Nov
DecidedDecided10 Sep

About this application

This is a planning application for a dormer extension at 18 Blackwater Avenue, Colchester CO4 3UY. Colchester has handled 141 applications of this type. There are no previous applications recorded at this address. In the past year there have been 24 applications across St Anne's & St John's. We hold 1,001 applications in total for the CO4 postcode area.

94% of full (8 week determination) applications at Colchester City Council were approved. Across all application types, the council typically decides in about 8 weeks (median).

Based on decided applications received in the last 3 years.See what's approved near your address

Application details

Postcode: CO4 3UY
Application type: Full (8 Week Determination)
Parish: Colchester

Planning application dates

Date validated: 15 September 2026
Consultation end: 7 October 2026
Target decision date: 10 November 2026

Applicant and agent

Applicant: Private applicant

Planning decision

Case officer: SimonM Grady

Additional information

UPRN: 100090440398

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Local nature reserve: Welsh WoodNext to the site
Flood zone 1: Low probability (rivers and sea)

Not published by this council, so not checked: Article 4 directions. Ask the council if these matter.

Also checked, none recorded (22)

flood storage areas, conservation areas, listed buildings, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

Source: Colchester

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