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Planning application

3 Belsize Mews London NW3 5AT

Granted Camden 2026/0106/P Householder Application

Works: Extension Loft or dormer Domestic

Read from the description, not a valuation. How we read the register

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Erection of roof extension including installation of two rooflights to the side and rear roof slopes, increase in the size of the roof terrace, and associated works.

As published by the council, reference 2026/0106/P

Application record

Reference
2026/0106/P
Type
Householder Application
Status
Final Decision
Decision
Granted
Received
12 Jan 2026
Validated
13 Jan 2026
Decided
6 Mar 2026
Ward
Belsize
Decision by
Members Briefing
Postcode
NW3 5AT

Site history

Applications at this address on the Camden register

This site has had 3 applications since 2024: 2 approved, 1 refused.

  • 2025/2354/P Refused

    3 Belsize Mews London NW3 5AT

    Erection of a dormer to rear roofslope (retrospective)

    Decided 5 Aug 2025 Full applications
  • 2024/3791/P Granted

    3 Belsize Mews London NW3 5AT

    Non-material amendment to planning permission ref. 2023/3257/P dated 20/06/2024 (for: Loft extension including new terrace area) namely; to alter the size and location of the approved roof lights and include an additional roof light

    Decided 21 Nov 2024 Full applications

Timeline

Dates from the published record

  1. 12 Jan 2026

    Received by Camden

  2. 13 Jan 2026

    Validated

    Checked as complete and ready for consideration.

  3. 6 Mar 2026

    Decision issued: Granted

  4. 9 Aug 2026

    Added to PlanIndex

Documents

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

17 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 this grant of permission means

Camden granted permission on 6 March 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

About householder applications

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • 3 Belsize Mews London NW3 5AT

    2024/3791/P 50 yards away

    Non-material amendment to planning permission ref. 2023/3257/P dated 20/06/2024 (for: Loft extension including new terrace area) namely; to alter the size and location of the approved roof lights and include an additional roof light

    Granted Full applications Extension Loft or dormer

  • 3 Belsize Mews London Camden NW3 5AT

    2023/3257/P 50 yards away

    Loft extension including new terrace area.

    Granted Full applications Extension Loft or dormer

  • 3 Belsize Mews London NW3 5AT

    2025/2354/P 50 yards away

    Erection of a dormer to rear roofslope (retrospective)

    Refused Full applications Loft or dormer

  • 1 Belsize Avenue London NW3 4BL

    2010/5623/T 50 yards away

    (TPO - 23H-T95) FRONT GARDEN - 1 x Mulberry - Reduce by 20% to previous pruning points.

    Refused Trees

  • 1 Belsize Avenue London NW3 4BL

    2011/0145/T 50 yards away

    (TPO Ref: 23H) FRONT GARDEN - 1 x Mulberry - Lift lower hanging branches. Trim back small branches overhanging the road to the line of the curb. Trim back light sprouting growth on lower trunk.

    Granted Trees

  • Flat C 9 Belsize Avenue London NW3 4BL

    2010/2890/P 50 yards away

    Replacement of front window with French doors and installation of railings associated with provision of first floor roof terrace above existing portico structure to residential unit (Class C3).

    Refused Full applications Windows or glazing

In Camden

  • 2026/4031/P Awaiting decision

    10 Albert Street London NW1 7NZ

    Erection of an extension to widen rear dormer window at second floor.

    Received 2 Oct, published by the council 6 Oct 2026 Householder
  • 2026/3231/P Granted

    9 Wadham Gardens London NW3 3DN

    Replacement rear timber casement window, installation of timber-panelled side access door, replacement of existing front boundary gates and piers, installation of metal railings, provision of reclaimed Yorkstone paving to the front garden and associated works.

    Received 30 Jul, published by the council 9 Aug 2026 Householder
  • 2026/4030/P Awaiting decision

    6 Leverton Street London NW5 2PJ

    Replace garden wall with metal railing; replace 3 rear windows, 3 rear elevation side windows, 1 rear door and 1 rear elevation side door with double-glazed crittal windows and doors; remove 2 rear windows; render rear elevation brickwork; and associated works.

    Received 1 Oct, published by the council 9 Oct 2026 Householder
  • 2026/3493/P Granted

    2 Wildwood Terrace London NW3 7HT

    Enlargement of the existing rear French doors and single-leaf door at lower ground floor level, together with the replacement of five rear timber sash windows.

    Received 14 Aug, published by the council 22 Aug 2026 Householder
  • 2026/2003/P Granted

    23 Glenmore Road London NW3 4BY

    Installation of external AC unit with acoustic enclosure to rear garden.

    Received 29 May, published by the council 24 Jul 2026 Householder