15 Belsize Park Mews London NW3 5BL

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

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 42 days over the applications it decided in the last year.

• 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

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 49 days. More in our guide to how long planning decisions take.

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.

• 15 Belsize Park Mews London NW3 5BL

  2023/3492/P 0m 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 6m 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 6m 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 7m 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 7m 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 7m 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

• 2026/4008/P Awaiting decision

  6 Murray Street London NW1 9RE

  Non-material amendment to planning permission ref. 2023/3483/P (dated 25/10/2023) for 'Erection of mansard roof extension and replacement shopfront', NAMELY for changes to the rear dormers.

  16 Sep 2026 Amendments
• 2026/2771/P Granted

  Land to the North of the British Library 96 Euston Road London NW1 2DB

  Non material amendment to planning permission 2022/1041/P dated 17/07/2024 for: ‘Demolition of the British Library Centre for Conservation, alterations to the British Library and erection of a new building of 12 above-ground storeys and two basement levels for use as library, galleries, learning, business and events spaces (Class F1) and retail and commercial spaces (Class E); provision of internal and external public spaces, landscaping and a community garden; improvement works adjacent to Dangoor Walk; provision of cycle and car parking and servicing facilities including new crossovers; provision of Crossrail 2 infrastructure; means of access; and associated works’. The amendment is to revise the wording of condition 3 (Crossrail 2 Infrastructure) and partially discharge the condition in respect of perimeter piling works.

  2 Jul 2026 Amendments
• 2026/3509/P Granted

  Flat A 55 Leverton Street London NW5 2NX

  Non-material amendment to planning permission 2026/0413/P dated 12/05/2026 (Erection of a single storey side and rear extension, re-construction of rear garden boundary wall, replacement of a ground floor rear window with an access door, replacement of a side door with a window, insertion of two rooflights and reinstatement of front sash windows), namely reduction in depth of proposed lightwell between existing rear elevation and new extension.

  4 Sep 2026 Amendments
• 2026/2957/P Granted

  Land to the North of the British Library 96 Euston Road London NW1 2DB

  Non material amendment to planning permission 2022/1041/P dated 17/07/2024 for: ‘Demolition of the British Library Centre for Conservation, alterations to the British Library and erection of a new building of 12 above-ground storeys and two basement levels for use as library, galleries, learning, business and events spaces (Class F1) and retail and commercial spaces (Class E); provision of internal and external public spaces, landscaping and a community garden; improvement works adjacent to Dangoor Walk; provision of cycle and car parking and servicing facilities including new crossovers; provision of Crossrail 2 infrastructure; means of access; and associated works’. The amendment is to revise the wording of condition 6 (Water Main) and discharge the condition.

  14 Jul 2026 Amendments
• 2026/3431/P Withdrawn

  17 Dartmouth Park Avenue London NW5 1JL

  Non-Material Amendment to planning reference 2023/1650/P dated 17/10/23 as amended by planning refereence 2024/1434/P dated 30/08/24 for replacement of side extension to the South Elevation, new rear extension to the lower ground floor, side annex to the North Elevation, front lightwell, general refurbishment to lower ground floor, replacement roof light to north pitch of the property and construction of outbuilding at the rear of the garden. NAMELY: amendments to guardrail.

  11 Aug 2026 Amendments