9 Waltham Avenue, London, NW9 9SH

This site has had 3 applications since 2025: 2 approved, 1 refused.

• 26/0193 Granted

  9 Waltham Avenue, London, NW9 9SH

  Proposed single storey rear extension, conversion of garage into habitable room with replacement of garage door with window to front elevation and alterations to garage roof, hip to gable extension, rear dormer window with 2x front rooflights, installation of a new side window and installation of window to the side roof slope to the dwellinghouse.

  Decided 21 Apr 2026 Householder
• 25/2493 Refused

  9 Waltham Avenue, London, NW9 9SH

  Certificate of lawfulness for proposed single storey rear extension and conversion of side garage into a habitable room with raised roof height and replacement of garage door with window to the front elevation of the dwellinghouse.

  Decided 24 Oct 2025 Lawful development

1. 3 Nov 2025

   Received by Brent

2. 11 Nov 2025

   Validated

   Checked as complete and ready for consideration.

3. 30 Dec 2025

   Decision issued: Certificate of Lawfulness - Granted

4. 11 Aug 2026

   Added to PlanIndex

Brent granted permission on 30 December 2025, 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.

• 29 Waltham Avenue, London, NW9 9SH

  25/3228 Submitted 18 Nov 2025 0m away

  Proposed single storey outbuilding to the rear garden of the dwellinghouse.

  Granted Householder 7 docs
  Small domestic

• 9 Waltham Avenue, London, NW9 9SH

  25/2493 Submitted 1 Sep 2025 0m away

  Certificate of lawfulness for proposed single storey rear extension and conversion of side garage into a habitable room with raised roof height and replacement of garage door with window to the front elevation of the dwellinghouse.

  Refused Lawful development Extension Windows or glazing 9 docs
  Small domestic

• 9 Waltham Avenue, London, NW9 9SH

  26/0193 Submitted 27 Jan 2026 0m away

  Proposed single storey rear extension, conversion of garage into habitable room with replacement of garage door with window to front elevation and alterations to garage roof, hip to gable extension, rear dormer window with 2x front rooflights, installation of a new side window and installation of window to the side roof slope to the dwellinghouse.

  Granted Householder Extension Loft or dormer +1 13 docs
  Small domestic

• 23 Waltham Avenue, London, NW9 9SH

  25/3093 Submitted 4 Nov 2025 0m away

  Proposed two-storey side to rear extension, raised patio, hip to gable-end roof extension, rear dormer, 2x front rooflights, front porch extension and outbuilding in rear garden of dwellinghouse

  Granted Householder Extension Loft or dormer 10 docs
  Small domestic

• 37 Waltham Avenue, London, NW9 9SH

  26/1589 Submitted 23 Jun 2026 2m away

  79% historically approved · decision due ~26 Aug

  Demolition of existing side garage and utility and proposed single storey side and rear extension...

  Decided Extension Demolition
  Small domestic

• 106 Valley Drive, London, NW9 9NS

  20/2410 Submitted 10 Aug 2020 63m away

  Retention of two storey side and rear extension, garage conversion, loft conversion with rear dormer window to dwellinghouse.

  Refused Householder Extension Loft or dormer +1 12 docs
  Small domestic

• 26/0783 Granted

  3 Hamilton Road, London, NW10 1NU

  Certificate of lawfulness for existing single-storey rear extension to dwellinghouse

  26 Mar 2026 Lawful development
• 26/1946 Awaiting decision

  120 Gladstone Park Gardens, London, NW2 6RL

  Certificate of lawfulness for proposed rear dormer extension with Juliet balcony, hip to gable roof extension, installation of 1x window to side elevation and 2x front rooflights to dwellinghouse.

  30 Jul 2026 Lawful development
• 26/1208 Granted

  50 Ballogie Avenue, London, NW10 1TA

  Certificate of lawfulness for proposed rear dormer extension, hip to gable roof extension, alteration to fenestration and installation of rooflights to the dwellinghouse

  13 May 2026 Lawful development
• 26/1015 Refused

  5 Midholm, Wembley, HA9 9LJ

  Certificate of lawfulness for proposed installation of solar panels to the side and rear roofslope of the dwellinghouse.

  23 Apr 2026 Lawful development
• 26/1176 Refused

  47 Barn Rise, Wembley, HA9 9NH

  Certificate of lawfulness for proposed single storey outbuilding in rear garden of the dwellinghouse.

  11 May 2026 Lawful development