Northumberland House 155 - 157 Great Portland Street London W1W 6QP

This site has had 5 applications since 2005: 2 approved, 2 refused.

• 26/00984/NMA Granted

  Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  Amendments to planning permission dated 12th November 2024 (RN: 24/06018/FULL) for Alterations to the entrance at ground floor level and installation of plant with screening and associated equipment at roof level. Namely, omission of previously approved GRP housing at roof level, relocation of 1no 175mm x 450mm louvre integrated into the head of existing WC window; and introduction of 6no 500mmx500mm ventilation louvres to south west elevation.

  Decided 15 Apr 2026 Amendments
• 07/05158/FULL Refused

  Northumberland House 155-157 Great Portland Street London W1W 6QP

  Relocation of air conditioning units onto the main roof within a new enclosure.

  Decided 14 Sep 2007 Full applications
• 06/01678/FULL Refused

  Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  Retention of four air conditioning condenser units on rear first floor flat roof.

  Decided 11 Sep 2006 Full applications
• 05/01357/CLEUD Granted

  Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  Installation of two air conditioning units in rear lightwell.

  Decided 9 May 2005 Lawful development

1. 24 Jul 2026

   Received by Westminster

2. 1 Aug 2026

   Added to PlanIndex

3. 16 Sep 2026

   Status changed to Decided

   Previously Pending.

Westminster has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

• Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  05/01357/CLEUD Submitted 21 Feb 2005 0m away

  Installation of two air conditioning units in rear lightwell.

  Granted Lawful development 5 docs

• Northumberland House 155-157 Great Portland Street London W1W 6QP

  07/05158/FULL Submitted 12 Jun 2007 0m away

  Relocation of air conditioning units onto the main roof within a new enclosure.

  Refused Full applications 12 docs

• Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  06/01678/FULL Submitted 6 Mar 2006 0m away

  Retention of four air conditioning condenser units on rear first floor flat roof.

  Refused Full applications 7 docs

• Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  26/00984/NMA Submitted 17 Feb 2026 4m away

  Amendments to planning permission dated 12th November 2024 (RN: 24/06018/FULL) for Alterations to the entrance at ground floor level and installation of plant with screening and associated equipment at roof level. Namely, omission of previously approved GRP housing at roof level, relocation of 1no 175mm x 450mm louvre integrated into the head of existing WC window; and introduction of 6no 500mmx500mm ventilation louvres to south west elevation.

  Granted Amendments Windows or glazing 14 docs

• Basement And Ground Floor Northumberland House 155 - 157 Great Portland Street London W1W 6QP

  26/01148/FULL Submitted 24 Feb 2026 4m away

  Dual alternative use of the ground and basement floors as showroom (sui generis) or MRI medical centre (Class E)

  Granted Full applications 17 docs

• Hallam House 56 - 60 Hallam Street London W1W 6JL

  25/04301/FULL Submitted 24 Jun 2025 12m away

  Demolition of existing roof plant room and erection of a single floor roof extension to provide one residential unit (Class C3). Erection of replacement plant room, and provision of an external terrace, landscaping and green roof. Alterations to rear fenestration pattern. Erection of single storey lower ground floor extension within rear lightwell to provide additional office floorspace (Class E) and replacement of a window with a door at front ground floor level.

  Granted Full applications Extension Roofing +2 124 docs
  Small domestic

• 26/06295/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Installation of a new shopfront.

  15 Sep 2026 Full applications
• 26/06297/FULL Awaiting decision

  15 Warwick Way London SW1V 1QT

  Alterations to rear elevation at basement level comprising repolacement window and installation of double opening door.

  15 Sep 2026 Full applications
• 26/06234/FULL Awaiting decision

  40 Grosvenor Place London SW1X 7HJ

  Use of lower ground floor of Unit 3 and ground floor of Unit 2 as gym (Class E(d)) and/ or office (Class E(g))

  11 Sep 2026 Full applications
• 26/06249/FULL Awaiting decision

  53 Wimpole Street London W1G 8YH

  Removal and Installation of external rear air condensers and associated pipe work to ground floor, including internal works to ground and first floor. (Linked with 26/06250/LBC)

  11 Sep 2026 Full applications
• 26/03576/FULL Decided

  15A Devonshire Terrace London W2 3DW

  Erection of an infill extension to basement courtyard to form new bedroom and internal alterations. (Linked with 26/03577/LBC)

  1 Jun 2026 Full applications