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
• 25/3084 Granted

  9 Waltham Avenue, London, NW9 9SH

  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 30 Dec 2025 Lawful development

1. 1 Sep 2025

   Received by Brent

2. 24 Oct 2025

   Decision issued: Certificate of Lawfulness - Refused

3. 11 Aug 2026

   Added to PlanIndex

Brent refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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.

• 3 Waltham Avenue, London, NW9 9SH

  21/3295 Submitted 27 Aug 2021 50 yards away

  Certificate of lawfulness for proposed hip to gable loft conversion with rear dormer window, juliet balcony, 3 front rooflights and erection of single storey outbuilding at rear of dwellinghouse.

  Refused Lawful development Loft or dormer Windows or glazing 9 docs
  Small domestic

• 3 Waltham Avenue, London, NW9 9SH

  21/3294 Submitted 27 Aug 2021 50 yards away

  Proposed single storey side to rear extension to dwellinghouse.

  Refused Householder Extension 8 docs
  Small domestic

• 29 Waltham Avenue, London, NW9 9SH

  25/3228 Submitted 18 Nov 2025 50 yards away

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

  Granted Householder 7 docs
  Small domestic

• 31 Waltham Avenue, London, NW9 9SH

  21/4403 Submitted 1 Dec 2021 50 yards away

  Prior approval for a single storey rear extension to dwellinghouse, in metres: Extending beyond the rear wall of the original house - 6m Maximum height - 3245m Eaves height - 2995m

  Refused Prior approval Extension 5 docs
  Small domestic

• 9 Waltham Avenue, London, NW9 9SH

  26/0193 Submitted 27 Jan 2026 50 yards 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 50 yards 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

• 26/2285 Awaiting decision

  137 Chatsworth Road, London, NW2 5QT

  Certificate of lawfulness for proposed use as supported housing

  Received 8 Sep, published by the council 21 Sep 2026 Lawful development
• 26/2277 Awaiting decision

  65 The Avenue, Wembley, HA9 9PH

  Certificate of lawfulness for proposed conversion of outbuilding into a gym and sauna and extension to the outbuilding in rear garden of the dwellinghouse.

  Received 8 Sep, published by the council 21 Sep 2026 Lawful development
• 26/2199 Awaiting decision

  Flat 8, 399 Neasden Lane North, London, NW10 0BD

  Certificate of lawfulness for existing use of rear unit 8 as a self-contained flat.

  Received 2 Sep, published by the council 21 Sep 2026 Lawful development
• 26/2093 Awaiting decision

  17 Buller Road, London, NW10 5BS

  Certificate of lawfulness for proposed alterations to front, side and rear fenestrations including installation of ground floor side oriel window and rear timber door to dwellinghouse

  Received 18 Aug, published by the council 21 Sep 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

  Received 13 May, published by the council 25 Jul 2026 Lawful development