12 Denbigh Street London SW1V 2ER Data via plota.co.uk

25/09106/FULL - Full Planning Permission Application Approved

Proposal

Erection of mansard roof extension and alterations to the front and rear elevations including changes to the windows and to rear closet wing. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
16 Dec 2025
✓
Approved
20 Mar 2026

Approved on 20 Mar 2026 · Delegated Decision · Last checked 3 Oct 2026

Documents 21

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 20 Mar 2026 View ↗ PDF DELEGATED REPORT Report · 20 Mar 2026 View ↗

Statements & assessments 3

PDF DESIGN AND ACCESS STATEMENT Design and Access Statement · 16 Dec 2025 View ↗ PDF HERITAGE STATEMENT Heritage Statement · 16 Dec 2025 View ↗ PDF FINAL PLANNING STATEMENT Background Papers · 16 Dec 2025 View ↗

Plans & drawings 5

PDF SITE LOCATION PLAN Drawing · 16 Dec 2025 View ↗ PDF SITE PLAN Drawing · 16 Dec 2025 View ↗ PDF EXISTING DRAWINGS Drawing · 16 Dec 2025 View ↗ PDF PROPOSED BLOCK PLAN Drawing · 16 Dec 2025 View ↗ PDF PROPOSED DRAWINGS Drawing · 16 Dec 2025 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 16 Dec 2025 View ↗ PDF FEECALCULATION Background Papers · 16 Dec 2025 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 18 Feb 2026 View ↗

Other documents 8

PDF RECEIPT OF APPLICATION Other · 18 Feb 2026 View ↗ PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 18 Feb 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 18 Feb 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 18 Feb 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 18 Feb 2026 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 18 Feb 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 16 Dec 2025 View ↗ PDF COVER LETTER Background Papers · 16 Dec 2025 View ↗

All documents on the council site ↗

Associated applications 2

Site constraints 12

Flood zone 3, rivers and sea
High chance: a 1 in 100 or greater annual chance from rivers, or 1 in 200 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
Pimlico 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 ↗
2 Article 4 directions
Article 4 Basement Development Permitted Rights Removed · Article 4 Direction Class E To C3 In Central Activities Zone. 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.
Archaeological priority area: City of Westminster APA 3.2
An assessment or field evaluation may be asked for before ground works.
The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.
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 ↗
Town centre: Warwick Way/ Tachbrook Street
A designated centre in the London Plan.
Shops, services and active frontages are protected in centres, and main town centre uses are steered here first.
National infrastructure project 428 m away: Thames Tideway Tunnel
The site is 428 m from the project boundary. Waste water treatment, decided. The project page says whether consent was granted. Also within 2 km: London Strategic Heat Main Project (at pre-application, 26 m).
Nationally significant infrastructure projects (power stations, electricity lines, pipelines, major roads and railways, harbours, airports and reservoirs) are consented by a Secretary of State under the Planning Act 2008, after an examination by the Planning Inspectorate, rather than by the council. The boundary is the one the Inspectorate consults on and can change as the scheme does. Projects are shown within 2 km of the site.
Planning Inspectorate project page ↗
7 listed buildings within 150 m
Nearest: Lamp post in front of 8 Churton Place, Grade II, 22 m away · 7 Grade II
The site itself is not listed. 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 all 7 with distances
Historic England ↗
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.
Registered park or garden 87 m away: Warwick Square
Its setting is a consideration for work nearby.
Registered parks and gardens, battlefields, world heritage sites and protected wrecks are designated heritage assets: harm needs clear and convincing justification.
Historic England ↗
Also on the record
Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square.
Not affected
Not green belt · No scheduled monument at the site

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.

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Important details

Council
Westminster
Application type
Full Planning Permission Application
Postcode
SW1V 2ER
Received
16 Dec 2025
Validated
16 Dec 2025
Ward
Pimlico North
Case officer
Show
Target decision
17 Apr 2026
Decision
Application Permitted
Decision date
20 Mar 2026
Decision level
Delegated Decision
Applicant
Show
Agent
The Plannery Ltd

How this decision compares

Decided in 94 days from validation, 20 days slower than Westminster's median of 74 for full applications. Approved, as 86% of full applications here are.

35%decided within 8 weeks
86%approved
1,866decided in the last year

Plota live figures for full applications decided by Westminster in the last twelve months, from validation. Westminster decision record →

Public comments

No public comments yet.

15 neighbours consulted · Last counted 3 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14558006
Planning Portal ref
PP-14558006
Comments by
18 Mar 2026
Site or press notice
25 Feb 2026
Env. assessment
No

Historical activity at this location

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

This property

Previous applications at this address

2017 Approved
Demolition of existing lower ground floor rear extension and replacement with a full widt…
17/05742/FULL
Within ~100m

Nearby activity

2025
9 Churton Place London SW1V 2LN
Erection of a mansard roof extension to replace the existing butterfly roof, including th…
25/07726/FULL
2025
16 - 16A Churton Street London SW1V 2LL
Erection of a mansard roof extension; replacement windows to the front elevation; alterat…
25/07509/FULL
2025
37 - 41 Belgrave Road London SW1V 2BB
Installation of three new air conditioning units within an acoustic compound in the rear…
25/07228/FULL
2025 Withdrawn
16 - 16A Churton Street London SW1V 2LL
Erection of a mansard roof extension; replacement timber sash windows to the front elevat…
25/04793/FULL
2025 Approved
80 Warwick Square London SW1V 2AR
Replacement of existing UPVC windows on front first floor with traditional timber frame F…
25/04472/LBC
2025 Approved
80 Warwick Square London SW1V 2AR
Replacement of existing UPVC windows on front first floor with traditional timber frame F…
25/05286/FULL
2025
Basement And Ground Floor 16 Warwick Way London SW1V 1RX
Installation of extract system and discharge at basement level into services yard.
25/06385/FULL
2025
9 Churton Place London SW1V 2LN
Erection of a roof extension to turn existing butterfly roof into a pitched roof, and ins…
25/03466/FULL
2025
9 Churton Place London SW1V 2LN
Replacement and enlargement of existing rear extension, rear infill extension on northwes…
25/02829/FULL
2025
4 Churton Place London SW1V 2LN
Norway Maple- Fell This tree had a previous application to fell bt the tree officer advis…
25/01344/TCA
2025
3 Charlwood Place London SW1V 2LX
t1 mature sycamore rear garden Reduce back to most recent reduction points . (4-5 years g…
25/01088/TCA
2024
83 Wilton Road London SW1V 1DL
Installation of vertical gas pipe to front elevation.
24/06495/FULL
2024
First Floor 26 - 28 Warwick Way London SW1V 1RX
Installation of two new air vents to the side and rear elevation and one new roof cowl on…
24/06220/FULL
2024
18 - 28 Warwick Way London SW1V 1RX
Display of X1 Halo Illuminated ATM surround sign measuring 2.58m x 1.25m
24/05514/ADV
2024
Flat 2 First Floor And Second Floor 62 Warwick Square London SW1V 2AL
Replacement of non-original closet wing flat roof; new services penetrations on rear elev…
24/03739/LBC
2024
Flat 2 First Floor And Second Floor 62 Warwick Square London SW1V 2AL
Replacement of closet wing flat roof; new services penetrations on rear elevations & alte…
24/03738/FULL
2023 Approved
25 Denbigh Street London SW1V 2HF
Replacement double glazed timber windows at front first and second floor level.
23/08610/FULL
2024
Tachbrook Street Public Convenience Tachbrook Street Market Tachbrook Street London SW1V 2SR
Installation of 1x Combined Copper & Fiber Cabinet.
24/02790/TELCOM
2024 Approved
26 - 28 Warwick Way London SW1V 1RX
Replacement shopfront.
24/00781/FULL
2024 Approved
32 Denbigh Street London SW1V 2ER
1 x sycamore (T1): crown reduce to previous, most recent reduction points, retaining shor…
24/01226/TPO
2016 Approved
Aog House 66 Warwick Square London SW1V 2AP
Variation of Condition 2 of appeal decision (APP/X5990/W/15/3132122) dated 9 February 201…
16/12044/FULL
2016 Approved
Aog House 66 Warwick Square London SW1V 2AP
Variation of condition 1 of listed building consent dated 17 July 2015 ( RN 14/12271/LBC)…
16/12049/LBC
2016 Approved
Flat 2 69 Warwick Square London SW1V 2AR
Replacement of existing conservatory glazing at the rear on first and second floors with…
16/11571/FULL
2016 Approved
Flat 2 69 Warwick Square London SW1V 2AR
Replacement of existing conservatory glazing at the rear on first and second floors with…
16/11572/LBC
2016 Approved
8 Denbigh Street London SW1V 2ER
Use of first, second and third floors as two residential units (Class C3) and raising of…
16/11797/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