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66 Ross Street Cambridge Cambridgeshire CB1 3BU

25/04322/FULFull ApplicationRefused
Full

Refused on 6 March 2026

Council decision: Refused PermissionPlanning committee1 reason for refusal

Proposal

Change of use of existing dwelling to 6 bedroom, 6 person HMO, including single storey rear extension.

Received
5 November 2025
Decision level
Planning committee
Ward
Romsey
  1. Received5 Nov
  2. Validated17 Nov
  3. Consult.23 Dec
  4. Target12 Jan
  5. Decided6 Mar

Decided in 109 days (council typically 49)

About this application

This is a full planning application for a single storey rear extension at 66 Ross Street Cambridge Cambridgeshire CB1 3BU. Cambridge has handled 1,534 applications of this type. This one was decided in 121 days, 10 weeks longer than Cambridge's typical decision time. The site is in the Mill Road conservation area. There are no previous applications recorded at this address. In the past year there have been 102 applications across Romsey. We hold 1,406 applications in total for the CB1 postcode area.

90% of full applications at Cambridge City Council were approved. Across all application types, the council typically decides in about 7 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Why it was refused

  1. The proposed operational development in the form of the single-storey rear extension would create a bedroom (bedroom no.3) that would fall below the nationally described space standard for a room of the size. It would measure approximately 6.2sqm whereas a 7.5sqm size room is required for a bedroom of this size. As such, the proposal fails to provide an acceptable living environment for the future occupant of this room and the development would be contrary to Paragraph 135 of the National Planning Policy Framework (2024) and Policies 48, 50 and 58 of the Cambridge Local Plan (2018).

From the council's decision notice.

Application details

Postcode
CB1 3BU
Application type
Full Application
Scale / size
Small
District
Cambridge City Council

Planning application dates

Date validated
17 November 2025
Consultation expiry
26 November 2025
Last date for comments
23 December 2025
Target decision date
12 January 2026
Committee meeting
4 March 2026

Applicant and agent

Agent address
Wheatcroft Chapel Road Langham Colchester CO45NY

Planning decision

Statutory period
56 days

Publicity

Last advertised
26 November 2025
Site notice start
2 December 2025

Additional information

Documents
25

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations at the address point. Ones next to the site may also apply.

  • Conservation area: Mill Road
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (23)

flood storage areas, listed buildings, Article 4 directions, 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, local 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.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Source: Cambridge

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