15 Portman Gardens London NW9 5AS

1. 24 Jun 2026

   Received by Barnet

2. 25 Jun 2026

   Validated

   Checked as complete and ready for consideration.

3. 23 Jul 2026

   Decision issued: Unlawful

4. 9 Aug 2026

   Added to PlanIndex

Barnet 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.

• 16 Portman Gardens London NW9 5AS

  26/3342/HSE Submitted 11 Sep 2026 50 yards away

  77% historically approved · decision due ~9 Nov

  Single storey side and rear extension with 3no. rooflights

  Awaiting decision Householder Extension Loft or dormer
  Small domestic

• 61 The Greenway London NW9 5AU

  26/3699/HSE Submitted 13 Oct 2026 50 yards away

  77% historically approved · decision due ~8 Dec

  Conversion of the existing garage into habitable room, insertion of window to replace garage door

  Awaiting decision Householder Windows or glazing
  Domestic

• 49 The Greenway London NW9 5AU

  25/4615/FUL Submitted 19 Nov 2025 100 yards away

  63% historically approved · decision due ~14 Jan

  Change of use from a single dwellinghouse (Use Class C3) to a 5 bed HMO (House in Multiple Occupation (Use Class C4) for 5 people including single storey rear extension

  Awaiting decision Full applications Extension 8 docs
  Small domestic

• The Hub Montrose Playing Fields The Greenway London NW9 5AT

  26/2455/FUL Submitted 29 Jun 2026 100 yards away

  63% historically approved · decision due ~7 Sep

  Installation of glazed enclosure to existing front covered outdoor seating area

  Decided Full applications Windows or glazing

• 1 Greenway Close London NW9 5AZ

  26/1139/HSE Submitted 25 Mar 2026 100 yards away

  Two storey side extension following the demolition of existing garage. Roof extension involving hip to gable to main roof. Single storey rear extension with 1no. rooflight, new decking and patio area. New front porch

  Refused Householder Extension Loft or dormer +1 10 docs
  Small domestic

• 1 Greenway Close London NW9 5AZ

  26/1141/192 Submitted 25 Mar 2026 100 yards away

  Roof extension involving hip to gable, rear dormer window with juliette balcony and 2no. front facing rooflights

  Granted Lawful development Extension Loft or dormer +1 9 docs

• 26/2679/192 Granted

  21 Myddelton Park London N20 0JH

  Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).

  Received 20 Jul, published by the council 7 Aug 2026 Lawful development
• 26/1362/191 Refused

  145 Cotswold Gardens London NW2 1PL

  Use as a House in Multiple Occupation (HMO) for 6 people

  Received 14 Apr, published by the council 25 Jul 2026 Lawful development
• 26/1907/191 Granted

  8 Golders Manor Drive London NW11 9HT

  Use of the property as a self-contained residential unit at ground floor level and the first and second floors as a 4-bedroom, 4-person House in Multiple Occupation (Sui Generis) (AMENDED DESCRIPTION)

  Received 21 May, published by the council 16 Aug 2026 Lawful development
• 26/2392/192 Refused

  6 Mostyn Road Edgware HA8 0JD

  New front hardstanding and vehicular access to provide off-street parking

  Received 23 Jun, published by the council 9 Aug 2026 Lawful development
• 26/2059/192 Refused

  Low Ridge Rowley Lane Barnet EN5 3HS

  Erection of a rear outbuilding

  Received 3 Jun, published by the council 16 Aug 2026 Lawful development