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
• 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. 17 Feb 2026

   Received by Westminster

2. 30 Mar 2026

   Validated

   Checked as complete and ready for consideration.

3. 15 Apr 2026

   Decision issued: Application Permitted

4. 21 Jul 2026

   Added to PlanIndex

Westminster granted permission on 15 April 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. 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 4m 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 4m 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 4m 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

  26/04985/FULL Submitted 24 Jul 2026 4m away

  87% historically approved · decision due ~18 Sep

  Alterations to entrance including installation of new entrance doors.

  Decided Full applications

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

  26/01148/FULL Submitted 24 Feb 2026 5m 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 16m 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

• 26/06251/NMA Awaiting decision

  19 Cumberland Street London SW1V 4LS

  Amendments to planning permission dated 20th March 2026 (RN:25/08960/FULL) for Lower ground floor rear infill extension with terrace above, replacement of rear first floor conservatory, new roof level rear single dormer with access to third floor roof terrace, alterations to windows and external refurbishment, namely the change of conservatory gable roof to a flat GRP roof.

  Received 11 Sep, published by the council 18 Sep 2026 Amendments
• 26/06201/NMA Awaiting decision

  Almack House 28 King Street St James's London SW1Y 6QW

  Amendments to planning permission dated 16th April 2026 (RN:26/01487/FULL) for Installation of a mechanical plant at lower ground floor and installation of two grilles to two lower ground floor windows, namely change to approved grille.

  Received 10 Sep, published by the council 17 Sep 2026 Amendments
• 26/06212/NMA Awaiting decision

  10 - 11 Lancaster Gate London W2 3LH

  Amendment to Condition 12 (Whole Life Carbon) of planning permission dated 19th April 2024 (RN 23/04044/FULL) for Change of use from hotel to residential use (Class C3) with associated internal alterations to create 11 new units and external alterations comprising reconfiguration and recladding of the rear extension and restoration of the existing building. Namely to include additional requirement to evidence and justify where benchmarks cannot be achieved, consider mitigation measures and if none, evidence that all mitigation measures have been exhausted. (Linked with RN 26/06213/ADFULL)

  Received 10 Sep, published by the council 17 Sep 2026 Amendments
• 26/06211/NMA Awaiting decision

  15 Portland Place London W1B 1PT

  Amendments to planning permission dated 21th July 2022 (RN:22/03521/FULL) for Variation of condition 5 of planning permission dated 11th April 2018 (17/10815/FULL) for the Use of the building for a temporary period of 20 years as a medical use (Use Class D1) personal to OM Tower LLP. Namely, to amend condition 3.

  Received 10 Sep, published by the council 16 Sep 2026 Amendments
• 26/06199/NMA Awaiting decision

  33 - 35 Praed Street London W2 1NR

  Amendments to planning permission dated 24th Septmebr 2024 (RN:24/03287/FULL) for Use of lower ground and ground floors as supermarket with ancillary bakery (Class E); Use of first, second and third floors as aparthotel with 19 bedrooms (Class C1); Installation of plant machinery and solar thermal panels at roof level, Replacement of windows; and associated external alterations. Namely, Introduction of two shawarma grill machines in the supermarket area at ground floor level; the introduction of a new canopy to provide ventilation for the two shawarma grill machines; and amendments to the ventilation design for the lower ground floor bakery canopy extract.

  Received 10 Sep, published by the council 17 Sep 2026 Amendments