3 Holly Mount London Camden NW3 6SG

This site has had 4 applications since 2026: 1 approved, 0 refused.

• 2026/2942/L Awaiting decision

  3 Holly Mount London Camden NW3 6SG

  Erection of mansard roof extension, raising of chimneys, opening of second-floor rear window, as well as internal works including removing of partition walls and expansion staircase

  Submitted 13 Jul 2026 Heritage and listed buildings
• 2026/0299/L Granted

  3 Holly Mount London Camden NW3 6SG

  Widening of the opening between the front and the rear room at ground floor level.

  Decided 4 Mar 2026 Heritage and listed buildings
• 2025/2123/P Awaiting decision

  3 Holly Mount London Camden NW3 6SG

  Proposed internal alterations to the Ground floor and Lower ground floor. External alterations include; enclosure of the rear areaway, widening of openings at Ground floor, construction of parapet wall to the rear closet wing, reinstate window arch at 1st floor, installation of rooflight to the rear bathroom.

  Full applications

1. 23 Jun 2026

   Received by Camden

2. 13 Jul 2026

   Validated

   Checked as complete and ready for consideration.

3. 24 Jul 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 7 September 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.

This application is with Camden for determination, against a statutory target of eight weeks. Over the last year Camden decided householder applications in a median of 58 days. More in our guide to how long planning decisions take.

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.

• 3 Holly Mount London Camden NW3 6SG

  2026/2942/L Submitted 13 Jul 2026 50 yards away

  96% historically approved · decision due ~7 Sep

  Erection of mansard roof extension, raising of chimneys, opening of second-floor rear window, as well as internal works including removing of partition walls and expansion staircase

  Awaiting decision Heritage and listed buildings Extension Loft or dormer +1 2 docs

• 3 Holly Mount London NW3 6SG

  2025/2158/L 50 yards away

  96% historically approved

  Proposed internal alterations to the Ground floor and Lower ground floor. External alterations include; enclosure of the rear areaway, widening of openings at Ground floor, construction of parapet wall to the rear closet wing, reinstate window arch at 1st floor, installation of rooflight to the rear bathroom.

  Awaiting decision Heritage and listed buildings Loft or dormer Windows or glazing

• 3 Holly Mount London Camden NW3 6SG

  2025/2123/P 50 yards away

  91% historically approved

  Proposed internal alterations to the Ground floor and Lower ground floor. External alterations include; enclosure of the rear areaway, widening of openings at Ground floor, construction of parapet wall to the rear closet wing, reinstate window arch at 1st floor, installation of rooflight to the rear bathroom.

  Awaiting decision Full applications Loft or dormer Windows or glazing

• 3 Holly Mount London Camden NW3 6SG

  2026/0299/L Submitted 26 Jan 2026 50 yards away

  Widening of the opening between the front and the rear room at ground floor level.

  Granted Heritage and listed buildings 13 docs

• 3 Holly Mount London NW3 6SG

  2025/5668/L Submitted 15 Dec 2025 50 yards away

  Details of condition 4 (doors, floors and bricks) of listed building consent (2025/2158/L) granted on 22/10/2025 for 'Internal and external alterations including the widening of existing openings and increasing the height of the closet wing to the rear and replacement skylight'

  Granted Heritage and listed buildings 19 docs

• 4 Holly Mount London Camden NW3 6SG

  2023/1926/L 50 yards away

  Creation of en-suite bathroom within existing modern roof extension.

  Granted Heritage and listed buildings Extension

• 2026/3064/P Granted

  205 Albany Street London NW1 4AB

  Installation of a free standing air source heat pump in the rear courtyard. Installation of an innovative, thin and flexible PV panels to the flat section of the roof

  Received 21 Jul, published by the council 24 Jul 2026 Householder
• 26-00297-HAPP Granted

  55 PATSHULL ROAD LONDON NW5 2LE

  Part 1-storey and 2-storey side and rear extensions, alterations to both rear and front gardens with introduction cycle parking at front

  Received 27 Apr, published by the council 24 Jul 2026 Householder
• 2026/3121/P Awaiting decision

  15 Elliott Square London NW3 3SU

  Erection of a single-storey rear and side extension, one new windows to the side elevation, alterations to the existing garage opening, and replacement of the front door.

  Received 17 Sep, published by the council 21 Sep 2026 Householder
• 2026/3120/P Awaiting decision

  15 Elliott Square London NW3 3SU

  Erection of a single-storey rear extension, two new windows to the side elevation, alterations to the existing garage opening and replacement of the front door.

  Received 17 Sep, published by the council 21 Sep 2026 Householder
• 2026/3997/P Awaiting decision

  33 Dartmouth Park Avenue London NW5 1JL

  Enlargement of existing two dormer windows on the rear and side elevations including a new rear rooflight and installation of air conditioning unit on rear roof.

  Received 16 Sep, published by the council 21 Sep 2026 Householder