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 50 yards 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 50 yards 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 50 yards 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 50 yards 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 50 yards 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 50 yards 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

• 26/07528/FULL Awaiting decision

  69 Eaton Place London SW1X 8DF

  Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

  Received 5 Nov, published by the council 6 Nov 2026 Full applications
• 26/05200/FULL Decided

  1 The Court House 165 Seymour Place London W1H 4PU

  Installation of waterproofing system to the existing lead flat roofs

  Received 3 Aug, published by the council 28 Aug 2026 Full applications
• 26/07521/FULL Awaiting decision

  Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

  Installation of one external condenser unit

  Received 4 Nov, published by the council 6 Nov 2026 Full applications
• 26/07508/FULL Awaiting decision

  Buckingham Palace The Mall London SW1A 1AA

  Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

  Received 4 Nov, published by the council 5 Nov 2026 Full applications
• 26/07472/FULL Awaiting decision

  Flat 3 82 New Cavendish Street London W1G 9TA

  Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

  Received 3 Nov, published by the council 6 Nov 2026 Full applications