21 Belsize Square London NW3 4HT

This site has had 5 applications since 2011: 2 approved, 3 refused.

• 2019/2496/P Refused

  21 Belsize Square London NW3 4HT

  Proposed Single Storey Rear Extension

  Decided 17 Nov 2021 Householder
• 2018/3229/P Refused

  21 Belsize Square London NW3 4HT

  Erection of single storey rear extension

  Decided 26 Oct 2018 Householder
• 2018/3231/P Granted

  21 Belsize Square London NW3 4HT

  Installation of full height upper ground floor window to rear elevation

  Decided 6 Sep 2018 Lawful development
• 2011/2872/P Refused

  21 Belsize Square London NW3 4HT

  Erection of side extension to ground floor of existing dwelling house (Class C3)

  Decided 29 Jul 2011 Full applications

1. 16 Oct 2017

   Received by Camden

2. 19 Oct 2017

   Validated

   Checked as complete and ready for consideration.

3. 13 Nov 2017

   Decision issued: Granted

4. 22 Jul 2026

   Added to PlanIndex

5. 30 Sep 2026

   Status changed to FINAL DECISION

   Previously Final Decision.

Camden granted permission on 13 November 2017, 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.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 21 Belsize Square London NW3 4HT

  2018/3229/P Submitted 9 Jul 2018 50 yards away

  Erection of single storey rear extension

  Refused Householder Extension 10 docs
  Small domestic

• 21 Belsize Square London NW3 4HT

  2018/3231/P Submitted 9 Jul 2018 50 yards away

  Installation of full height upper ground floor window to rear elevation

  Granted Lawful development Windows or glazing 5 docs

• 21 Belsize Square London NW3 4HT

  2019/2496/P Submitted 13 May 2019 50 yards away

  Proposed Single Storey Rear Extension

  Refused Householder Extension 12 docs
  Small domestic

• 21 Belsize Square London NW3 4HT

  2011/2872/P 50 yards away

  Erection of side extension to ground floor of existing dwelling house (Class C3)

  Refused Full applications Extension
  Domestic

• Flat 5, 22 Belsize Square, London, NW3 4HT

  2017/1821/P 50 yards away

  Installation of x1 rooflight at rear roofslope.

  Granted Full applications Loft or dormer

• Flat 5 22 Belsize Square London NW3 4HT

  2014/5550/P 50 yards away

  Replacement of front and rear timber balcony doors & windows, replacement of steel framed balustrades with frameless glass balustrade, and lowering of parapet walls.

  Granted Full applications Windows or glazing

• 2026/4314/P Awaiting decision

  Basement Flat & Flat Raised Ground Floor 46 Primrose Hill Road London NW3 3AA

  Amalgamation of two self-contained flats to form a self-contained maisonette on lower ground and raised ground floor.

  Received 6 Oct, published by the council 9 Oct 2026 Lawful development
• 2026/4304/P Awaiting decision

  68 Clarence Way London NW1 8DG

  Erection of single storey outbuilding in rear garden.

  Received 2 Oct, published by the council 9 Oct 2026 Lawful development
• 2026/3821/P Granted

  Plots B, C and D at Highgate Studios Highgate Road London NW5 1TL

  Certificate of Lawful Development to confirm the lawful use of the site is for office use (Class E(g)(i)) and that the use of the site as a gym (Class E(d)) or any other use falling within Class E would be lawful.

  Received 4 Sep, published by the council 11 Sep 2026 Lawful development
• 2026/3389/P Granted

  99 Heath Street London NW3 6SS

  Confirmation of the implementation of planning permission 2007/3874/P granted, subject to a legal agreement dated 06/12/2007 for 'Change of use from offices (A2) to single family dwellinghouse (C3), the erection of extension at rear ground floor level within courtyard and formation of a terrace over, extension at ground floor level to western end of courtyard, creation of off-street open car parking space and minor elevational changes to The Mount elevation.', by way of erection of the extension at ground floor level to the western end of the courtyard, creation of an off-street car parking space, and minor elevational changes to the Mount elevation.

  Received 7 Aug, published by the council 15 Aug 2026 Lawful development
• 2026/2493/P Granted

  8 Fitzroy Road London Camden NW1 8TX

  Use of the entire building for a single-family home (C3 residential).

  Received 16 Jun, published by the council 24 Jul 2026 Lawful development