Royal Institute Of British Architects 66 Portland Place London W1B 1AD Data via plota.co.uk

26/01527/ADLBC - Approval of Details (ADLBC) Approved
Admin / proceduralListed buildings

Proposal

Details of the new internal secondary glazing pursuant to discharge of condition 7 (Part 10) of listed building consent dated 11th June 2025 (RN: ). Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
10 Mar 2026
✓
Approved
14 Apr 2026

Approved on 14 Apr 2026 · Delegated Decision · Last checked 28 Jul 2026

Documents 11

Decision & officer reports 2

PDF APPR. OF DETAILS-LBC RESMAT [PE] Decision Notice · 14 Apr 2026 View ↗ PDF DELEGATED REPORT Report · 14 Apr 2026 View ↗

Plans & drawings 4

PDF FIRE FIGHTING STAIR SECONDARY GLAZING TYPICAL DETAIL Drawing · 10 Mar 2026 View ↗ PDF FIRE FIGHTING STAIR SECONDARY GLAZING, DETAIL TO STAIR 02 Drawing · 10 Mar 2026 View ↗ PDF PROPOSED EXTERNAL DOOR, WINDOW AND SECONDARY GLAZING SCHEDULES Drawing · 10 Mar 2026 View ↗ PDF PROPOSED SECONDARY GLAZING TYPES Drawing · 10 Mar 2026 View ↗

Application forms 1

PDF APPLICATION FORM REDACTED Application Form · 10 Mar 2026 View ↗

Other documents 4

PDF ACK-APPROVAL OF DETAILS APPL. Background Papers · 10 Apr 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 12 Mar 2026 View ↗ PDF GAS WINDOWS LOCATIONS Background Papers · 10 Mar 2026 View ↗ PDF COVER LETTER Background Papers · 10 Mar 2026 View ↗

All documents on the council site ↗

Associated applications 13

Site constraints 11

Grade II* listed: The Royal Institute of British Architects
List entry 1227026 · The pin is inside its outline · 19 more listed buildings within 150 m (7 Grade II*, 12 Grade II)
Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.
Show the other 19 with distances
Historic England ↗
Harley Street conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
Article 4 direction
Article 4 Basement Development Permitted Rights Removed. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Protected view corridor: 4A.2 Primrose Hill summit to the Palace of Westminster
Inside the landmark viewing corridor of a protected vista. A building that rises above the corridor's threshold height should be refused. How high that is depends on where along the view the site is.
The London Plan (policy HC4) designates strategic views, and the Mayor's London View Management Framework (March 2012) gives 13 of them a protected vista toward St Paul's Cathedral, the Palace of Westminster or the Tower of London. A vista has a threshold height that rises or falls with the line of sight. In the landmark viewing corridor, a building above it would harm the view and should be refused. In the wider setting consultation area around the corridor, a building above it is referred for consultation and its effect on the view is judged. The threshold changes along each view and is set out in the framework. A revised framework is out for consultation until 4 December 2026 and is not yet in force.
London View Management Framework ↗
Air quality management area: Westminster AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
Central activities zone
The core of central London in the London Plan.
Offices, culture and the other strategic functions of the centre take priority over new housing here.
Also on the record
Scheduled monument 179 m away: A subterranean commercial ice-well (City of Westminster), Park Crescent West, W1; Registered park or garden 203 m away: Regent's Park; National infrastructure project 1946 m away: Thames Tideway Tunnel; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square.
Not affected
Outside flood zones 2 and 3 · Not green belt

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

Building

Floor area6,618 m² (71,235 sq ft)
Energy ratingC (asset rating 74)
UseD1 Non-residential Institutions - Libraries Museums and Galleries
HeatingHeating and Natural Ventilation

From the energy performance certificate lodged in January 2018, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Westminster
Application type
Approval of Details (ADLBC)
Postcode
W1B 1AD
Received
10 Mar 2026
Validated
10 Mar 2026
Ward
West End
Case officer
Show
Target decision
5 May 2026
Decision
Application Permitted
Decision date
14 Apr 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Newmark

Consultation & key dates

Alt. reference
PP-14765433
Planning Portal ref
PP-14765433
Env. assessment
No

Historical activity at this location

35 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2025
Details of new external fire escape, new pavement lights and supporting structure in the…
25/07571/ADLBC
2025
Details of new external external fire escape stairs, new pavement lights and supporting s…
25/07253/ADLBC
2025 Approved
Details of Fire Safety Works in part pursuant to condition 8 of listed building consent d…
25/05501/ADLBC
2025 Approved
Details of new windows including new fire-fighting core windows or adjusted ceilings and…
25/05533/ADLBC
2025
Internal and external alterations including internal layout alterations, refurbishment an…
25/01205/LBC
2025
Internal and external alterations including internal layout alterations, refurbishment an…
25/01204/FULL
2024 Approved
Provision of internal fire upgrade works
24/04471/LBC
2024
Installation of 6No. antennas, 2no. 300mm dishes, 3no. cabinets and ancillary works there…
24/05117/LBC
2024
Installation of 6No. antennas, 2no. 300mm dishes, 3no. cabinets and ancillary works there…
24/05116/FULL
2024
Investigative opening-up works at all floor levels
24/02394/LBC
Within ~100m

Nearby activity

2025
52 Portland Place London W1B 1NH
Demolition, refurbishment, restoration and alterations to 52 Portland Place as well as re…
25/08377/LBC
2025
52 Portland Place London W1B 1NH
Demolition, refurbishment, restoration and alterations to 52 Portland Place as well as re…
25/08376/FULL
2025 Approved
50 Hallam Street London W1W 6JJ
Extension of party wall and replacement of single chimney of front chimney stack of 50 Ha…
25/03602/LBC
2025
167 - 169 Great Portland Street London W1W 5PA
External works comprising alterations to ground floor entrance and shopfront including in…
25/07527/FULL
2025
Hallam Street London
Display of one non illuminated fascia sign measuring 0.375m x 1.015m located beneath Cave…
25/07298/ADV
2025 Refused
167 - 169 Great Portland Street London W1W 5PA
External works comprising alterations to ground floor entrance and shopfront including in…
25/05704/FULL
2025 Withdrawn
Hallam House 56 - 60 Hallam Street London W1W 6JL
Demolition of existing roof plant room and erection of a single floor roof extension abov…
25/03713/FULL
2025
Hallam House 56 - 60 Hallam Street London W1W 6JL
Demolition of existing roof plant room and erection of a single floor roof extension abov…
25/04301/FULL
2025
Hampden House 2 Weymouth Street London W1W 5BT
Variation of Condition 1 and 12 of planning permission dated 11 October 2023 (RN:23/02110…
25/02173/FULL
2025
48 Portland Place London W1B 1NN
Pitched and flat roof repairs, external render repairs and redecoration, timber window re…
25/00294/LBC
2024
Hallam House 56 - 60 Hallam Street London W1W 6JL
Installation of replacement access door to ground floor front elevation at south west cor…
24/07743/FULL
2024
Tennyson House 159 - 165 Great Portland Street London W1W 5PA
Alterations to ground floor entrance; installation of plant equipment at roof level; and…
24/07581/FULL
2024
167 - 169 Great Portland Street London W1W 5PA
External works comprising alterations to ground floor entrance; installation of plant equ…
24/07573/FULL
2024
Devon House 171 - 177 Great Portland Street London W1W 5PQ
Alterations to existing facade comprising reconfiguration of existing entrances and shopf…
24/07574/FULL
2024 Approved
Basement Premises Hallam Court 77 Hallam Street London W1W 5HB
Use of the lower ground floor as a self-contained studio flat at Hallam Court (Class C3)
24/01688/FULL
2024
Second Floor Flat 48 Portland Place London W1B 1NG
General internal alterations with hallway cupboard changed into a WC, main bathroom chang…
24/04381/LBC
2024 Approved
76-78 Portland Place London W1B 1NT
Change of use of lower ground to 7th floor as Class E (g) (i) office use and/or Class (E)…
24/01846/FULL
2024 Approved
Stone House 9 Weymouth Street London W1W 6DB
Use of the lower ground floor (part) and ground floor (part) as 3 flats (Class C3) along…
24/01747/FULL
2024
Flat A 5 Hallam Mews London W1W 6AR
This application is for permission to fell a dead silver birch tree to the rear of the fl…
24/04052/TCA
2022 Refused
Telephone Kiosk Opposite Great Portland Street Station Great Portland Street London
Installation of one new BT Street Hub, incorporating two digital 75" LCD advert screens…
22/04778/FULL
2017 Approved
Basement And Ground Floor Flat 74 Portland Place London W1B 1NR
Erection of part single and part two storey rear extension at basement and ground floor l…
17/06801/FULL
2017 Withdrawn
82 Portland Place London W1B 1NS
Enlargement of two flats at 7th floor into the 8th floor roof space to create duplex unit…
17/05656/CLOPUD
2017 Approved
Suite B And C Ground Floor Stone House 9 Weymouth Street London W1W 6DB
Use of ground floor as a three bedroom flat (Class C3). Land use swap with lower ground f…
17/03625/FULL
2017 Approved
159 Great Portland Street London W1W 5PA
Use of the public highway on Weymouth Street for the placing of 4 no. tables, 8 no, chair…
17/05491/TCH
2017 Approved
159 Great Portland Street London W1W 5PA
Use of the public highway on Weymouth Street for the placing of 4 no. tables, 8 no, chair…
17/05491/FULL
Westminster
Planning Authority Score
3.5/10
Below average
#221 of 296 councils
Relevant to this application:
Householder decisions

Westminster is slower than most councils at deciding householder applications, ranking #258 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Westminster is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.

One of the strictest councils
only 81% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Westminster decision statistics
Based on MHCLG data, the year to March 2026
86%
Overall approval rate
Below avg (87%) #201 of 296
81%
Householder approved
Below avg (90%) #277 of 296
44%
Decided in 8 weeks
Below avg (63%) #258 of 296
28%
Extended time limit
Below avg (41%) #46 of 296
83%
Minor dwellings approved
12 decided (1-9 homes)
67%
Major dwellings approved
3 decided (10+ homes)
81%
Change of use approved
133 decided
4,602
Total decisions
648 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.