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Planning application

15 Belsize Park Mews London NW3 5BL

Awaiting decision Camden 2026/3909/P Variation or Removal of Condition(s)

Works: Extension Windows or glazing

Relates to 2023/3492/P

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

Variation of Condition 2 (Approved Plans) of planning reference 2023/3492/P dated 07/08/26 for erection of roof extension, new basement level, alterations to fenestration and associated works. NAMELY: to allow revisions to the external architectural treatment of approved development.

As published by the council, reference 2026/3909/P

Application record

Reference
2026/3909/P
Type
Variation or Removal of Condition(s)
Status
Registered
Received
10 Sep 2026
Validated
14 Sep 2026
Ward
Belsize
Postcode
NW3 5BL

Site history

Applications at this address on the Camden register

This site has had 2 applications since 2024: 1 approved, 0 refused.

  • 2023/3492/P Granted

    15 Belsize Park Mews London NW3 5BL

    Erection of roof extension, new basement level, alterations to fenestration and associated works.

    Decided 7 Aug 2024 Full applications

Timeline

Dates from the published record

  1. 10 Sep 2026

    Received by Camden

  2. 14 Sep 2026

    Validated

    Checked as complete and ready for consideration.

  3. 17 Sep 2026

    Added to PlanIndex

  4. Decision

    Awaiting decision

    Decision expected by 9 November 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

    Camden took a median of 43 days over the applications it decided in the last year.

Cases linked to this one on the register

  • 2023/3492/P Granted

    15 Belsize Park Mews London NW3 5BL

    Erection of roof extension, new basement level, alterations to fenestration and associated works.

    Decided 7 Aug 2024 Full applications

Documents

Plans, drawings, consultee responses and the officer's report

13 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

Watch members (£5 a month) open the document list from here.

Open the documents

What happens while it is decided

This application is with Camden for determination, against a statutory target of eight weeks. Over the last year Camden decided amendment applications in a median of 55 days. More in our guide to how long planning decisions take.

About amendment applications

An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • 15 Belsize Park Mews London NW3 5BL

    2023/3492/P 50 yards away

    Erection of roof extension, new basement level, alterations to fenestration and associated works.

    Granted Full applications Extension Windows or glazing

  • 1 Baynes Mews London NW3 5BH

    2026/2015/P Submitted 19 May 2026 50 yards away

    Erection of rear dormers, creation of sunken roof terrace, installation of rooflights and replacement of garage door.

    Granted Householder Loft or dormer 25 docs
    Domestic

  • 2 Baynes Mews London NW3 5BH

    2026/0796/P Submitted 27 Feb 2026 50 yards away

    Erection of rear dormers, creation of sunken roof terrace, installation of rooflights, conversion of garage into habitable room and replacement of garage door.

    Granted Householder Loft or dormer 23 docs
    Domestic

  • 3 Baynes Mews London NW3 5BH

    2023/1043/P 50 yards away

    Garage conversion into habitable space and continued use of the property as a single dwellinghouse, installation and replacement of windows on the front elevation at first floor level and replacement of the front door and garage doors at ground floor level.

    Granted Full applications Windows or glazing
    Small domestic

  • 3 Baynes Mews London NW3 5BH

    2024/0923/P Submitted 7 Mar 2024 50 yards away

    Details of secure and covered cycle storage area required by condition 4 (cycle storage) of planning permission 2023/4925/P dated 04/03/2024 (for the variation of condition 2 (approved plans) of planning permission 2023/1043/P for 'Garage conversion into habitable space and continued use of the property as a single dwellinghouse, installation and replacement of windows on the front elevation at first floor level and replacement of the front door and garage doors at ground floor level', namely to erect a rear dormer and enlarge the timber entrance door.)

    Granted Full applications Loft or dormer Windows or glazing 1 doc
    Small domestic

  • 3 Baynes Mews London NW3 5BH

    2023/4925/P Submitted 17 Nov 2023 50 yards away

    Variation of condition 2 (approved plans) of planning permission 2023/1043/P for 'Garage conversion into habitable space and continued use of the property as a single dwellinghouse, installation and replacement of windows on the front elevation at first floor level and replacement of the front door and garage doors at ground floor level', namely to erect a rear dormer and enlarge the timber entrance door.

    Granted Amendments Loft or dormer Windows or glazing 14 docs
    Small domestic

In Camden

  • 2026/1139/P Granted

    25 John Street London WC1N 2BS

    Alterations to design of conservatory, windows and doors approved under planning permission 2024/0312/P dated 06/08/2024.

    Received 26 Mar, published by the council 24 Jul 2026 Amendments
  • 2026/4266/P Awaiting decision

    Unit 3A Camden Wharf London 28 Jamestown Road NW1 7BY

    Variation of the planning permission dated 15.3.1999 (Registered No PE9700702R3) for the redevelopment of the eastern part of the site by the erection of a four-storey building for mixed A1, A3 and B1 and the retention of the lock-keepers cottage as a Canal Information Centre with ancillary retail/ cafe comprising alterations to the elevations, fenestration, shopfront, balustrading, terraces, roof plant and the omission of the approved canopy over the pedestrian area as well as the discharging of part of condition 1 of the said planning permission relating to approval of details of balustrades, shopfronts, the canopy attached to the commercial building and any structure related to it.

    Received 30 Sep, published by the council 6 Oct 2026 Amendments
  • 2026/3366/P Granted

    Flat Lower Ground Floor 133 King Henry's Road London NW3 3RD

    Variation of condition 2 (approved plans) of planning permission 2025/1032/P dated 23/04/2025 (which amended 2023/5117/P dated 22/03/2024 (for: Erection of single storey rear extension at lower ground floor, new windows to front and side elevations and new front door) NAMELY, changes to front elevation window and materials

    Received 6 Aug, published by the council 22 Aug 2026 Amendments
  • 2026/4223/P Awaiting decision

    6 Conybeare London NW3 3SD

    Variation of Condition 2 (approved plans) of planning permission ref. 2022/2870/P, dated 13/12/2022, for the erection of a single-storey roof extension and internal roof terrace to the front part of the building, namely to regularise amendments to the approved scheme.

    Received 29 Sep, published by the council 6 Oct 2026 Amendments
  • 2026/4045/P Granted

    234 - 240 Grafton Road London NW5 4NS

    Non-material amendment to planning permission 2024/4574/P granted 21/01/2026 for 'Erection of mansard roof extension to accommodate 1 x one bedroom and 1 x two bedroom dwellings; erection of a part one part two storey semi-detached one bedroom dwelling within rear garden to Dale Road; new cycle storage within rear garden, installation of 1 x ASHP in rear garden and 2 x ASHP on mansard roof of terrace, alterations to front boundary treatment.' namely to amend windows on the rear elevation of the existing building.

    Received 18 Sep, published by the council 24 Sep 2026 Amendments