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Marylebone Institute School House 29 Cosway Street London NW1 6TH

17/11404/COFULFull Application for Council's Own Dev.Approved
Full

Approved on 29 March 2019

Council decision: Application PermittedPlanning committee

Approximate location: the centre of the postcode, not the exact property.

Proposal

Demolition of existing buildings and structures and erection of new building of up to five storeys plus basement floor to provide 49 residential units (Class C3); with car and cycle parking, storage and plant rooms at basement level and landscaping to central garden and site frontages and associated works.

Received
22 December 2017
Decision level
Planning committee
Public comments
17
Ward
Church Street
Agent
Peter Brett Associates LLP
  1. Received22 Dec
  2. Validated5 Jan
  3. Consult.
  4. Target6 Apr
  5. Decided29 Mar

Decided in 448 days (council typically 49)

About this application

This is a full planning application for demolition at Marylebone Institute School House 29 Cosway Street London NW1 6TH. Westminster has handled 4,484 applications of this type. This one was decided in 462 days, 59 weeks longer than Westminster's typical decision time. The site is in the Lisson Grove conservation area, with 4 listed buildings nearby. There have been 4 other applications at this address. In the past year there have been 33 applications across Church Street. We hold 3,181 applications in total for the NW1 postcode area.

86% of full applications at City of Westminster were approved. Across all application types, the council typically decides in about 7 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Application details

Postcode
NW1 6TH
Application type
Full Application for Council's Own Dev.
Scale / size
Large
Number of dwellings
49

Planning application dates

Date validated
5 January 2018
Consultation expiry
6 July 2018
Target decision date
6 April 2018
Committee meeting
7 August 2018

Applicant and agent

Agent
Peter Brett Associates LLP
Agent address
33 Bowling Green Lane London EC1R 0BJ United Kingdom

Planning decision

Statutory period
91 days

Publicity

Last advertised
15 June 2018
Advertisement expiry
6 July 2018

Additional information

Planning Portal ID
PP-06492986
Documents
150

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations at the address point. Ones next to the site may also apply.

  • Conservation area: Lisson Grove
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed
  • Brownfield land register: Marylebone Institute School House 29 Cosway Street London NW1 6THRegister site at or near this address · +1 more
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)

flood storage areas, listed buildings, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves and heritage coasts.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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