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

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

• 26/04985/FULL Decided

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

  Alterations to entrance including installation of new entrance doors.

  Submitted 24 Jul 2026 Full applications
• 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
• 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. 6 Mar 2006

   Received by Westminster

2. 18 Jul 2006

   Validated

   Checked as complete and ready for consideration.

3. 11 Sep 2006

   Decision issued: Application Refused

4. 30 Aug 2026

   Added to PlanIndex

Westminster 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 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

  26/04985/FULL Submitted 24 Jul 2026 50 yards away

  88% historically approved · decision due ~18 Sep

  Alterations to entrance including installation of new entrance doors.

  Decided Full applications

• 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

• 26/05708/FULL Decided

  Flat 23 Imperial Court 55 - 56 Prince Albert Road London NW8 7PT

  Replacement of existing windows and louvres.

  Received 20 Aug, published by the council 18 Sep 2026 Full applications
• 26/05984/FULL Decided

  41 Sutherland Street London SW1V 4JX

  Replacement of front, side and rear windows with double glazed timber framed sash windows and replacement of a door with a double glazed timber framed door.

  Received 2 Sep, published by the council 11 Sep 2026 Full applications
• 26/07229/FULL Awaiting decision

  5 D'arblay Street London W1F 8DL

  Alterations to the existing fixed windows to form two openable sash windows. (Linked with 26/07230/ADV)

  Received 22 Oct, published by the council 26 Oct 2026 Full applications
• 26/07224/FULL Awaiting decision

  8 Hinde Street London W1U 3BQ

  Use of the building as an Embassy (sui generis) with reversion to Class E on cessation of occupation by the Government of the United Mexican States. Erection of a flagpole to front elevation.

  Received 22 Oct, published by the council 26 Oct 2026 Full applications
• 26/06134/FULL Decided

  Flat 10H Hyde Park Mansions Cabbell Street London NW1 5BG

  Replacement of front and rear second floor level windows with slim-profile double-glazed panels, retaining the existing window and door frames.

  Received 8 Sep, published by the council 15 Sep 2026 Full applications