1 Sussex Street London SW1V 4RZ Data via plota.co.uk

26/04924/FULL - Full Planning Permission Application Approved
Extensions & alterations

Proposal

Erection of mansard extension and new side window at second floor level. Data via plota.co.uk

Track application Save this application and get an email when its status or decision changes. Alerts nearby Get email alerts for new planning applications near this address.
View original council record ↗Last checked

Application progress

✓
Received
23 Jul 2026
✓
Approved
4 Sept 2026

Approved on 4 Sept 2026 · Delegated Decision · Last checked 4 Sept 2026

Documents 19

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 4 Sept 2026 View ↗ PDF DELEGATED REPORT Report · 4 Sept 2026 View ↗

Statements & assessments 2

PDF HOUSEHOLDER SUSTAINABLE DESIGN STATEMENT Background Papers · 23 Jul 2026 View ↗ PDF FLOOD RISK & HERITAGE STATEMENT Design and Access Statement · 23 Jul 2026 View ↗

Plans & drawings 7

PDF SITE LOCATION PLAN Location Plan · 23 Jul 2026 View ↗ PDF P1145-EX301- EXISTING PLANS Drawing · 23 Jul 2026 View ↗ PDF P1145-EX302- EXISTING ELEVATIONS Drawing · 23 Jul 2026 View ↗ PDF P1145-EX303- EXISTING SECTIONS Drawing · 23 Jul 2026 View ↗ PDF P1145-PL301A- PROPOSED PLANS Drawing · 23 Jul 2026 View ↗ PDF P1145-PL302A- PROPOSED ELEVATIONS Drawing · 23 Jul 2026 View ↗ PDF P1145-PL303- PROPOSED SECTIONS Drawing · 23 Jul 2026 View ↗

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 23 Jul 2026 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 24 Jul 2026 View ↗

Other documents 6

PDF RECEIPT OF APPLICATION Other · 24 Jul 2026 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 24 Jul 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 24 Jul 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 24 Jul 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 24 Jul 2026 View ↗ PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 24 Jul 2026 View ↗

All documents on the council site ↗

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 ↗
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.
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 ↗
National infrastructure project 246 m away: Thames Tideway Tunnel
The site is 246 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, 244 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 ↗
13 listed buildings within 150 m
Nearest: 108-138, Cambridge Street Sw1, Grade II, 13 m away · 1 Grade II*, 12 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 13 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.
Also on the record
Registered park or garden 106 m away: Warwick Square; Heritage at risk 66 m away: Church of St Gabriel, Warwick Square, Pimlico; Inside the City of Westminster built-up area; Public transport access: PTAL 6a (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.

Sales history 2

Last sold for £3,250,000 in June 2025. Detached house, freehold.

27 June 2025£3,250,000
29 July 2011£2,950,000

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area281 m² (3,025 sq ft)
Energy ratingE (52 out of 100), could reach C
PropertyEnd-terrace house, 8 habitable rooms
BuiltBefore 1900
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in February 2024, the latest held for this property. The building may have changed since. View the certificate

Work with planning data?

Every application in Westminster - and every UK council - as a live feed, an API, or a bulk CSV export.

About Plota's data service

Other new applications on this street

9 Sept 2026Approved

4 Sussex Street London SW1V 4RS

Replacement of existing single glazed timber framed sash windows to front and si...

26/05978/FULL

Nearby new applications

23 Oct 2026Pending

65 Cambridge Street London SW1V 4PS

Excavation of the front vaults to provide a new bathroom and small utility area ...

26/06871/FULL
21 Oct 2026Pending

119 Warwick Way London SW1V 4HS

Conversion and internal alterations to the ground floor flat (Retrospective)

26/07192/LBC
20 Oct 2026Pending

30 Westmoreland Terrace London SW1V 4AL

Replacement timber double glazed rear door.

26/07201/FULL
20 Oct 2026Pending

129D St George's Drive London SW1V 4DA

Replacement of five existing single-glazed timber sliding sash windows (three to...

26/06293/FULL
20 Oct 2026Pending

16 Warwick Way London SW1V 1RX

Kitchen extract duct at ground floor level with external rear ductwork from kitc...

26/07162/FULL
19 Oct 2026Pending

Crown Reach 145 Grosvenor Road London SW1V 3JY

Display of two non illuminated freestanding monolith sign (totem sign) measuring...

26/05716/ADV

Important details

Council
Westminster
Application type
Full Planning Permission Application
Postcode
SW1V 4RZ
Received
23 Jul 2026
Validated
23 Jul 2026
Ward
Pimlico North
Case officer
Show
Target decision
17 Sept 2026
Decision
Application Permitted
Decision date
4 Sept 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Peek Architecture Ltd

How this decision compares

Decided in 43 days from validation, 12 days faster than Westminster's median of 55 for extensions. Approved, as 88% of extensions here are.

56%decided within 8 weeks
88%approved
1,688decided in the last year

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

Public comments

No public comments yet.

23 neighbours consulted · Last counted 4 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15101192
Planning Portal ref
PP-15101192
Comments by
26 Aug 2026
Site or press notice
5 Aug 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

2024 Approved
Erection of mansard roof extension including new conservation rooflight; raising existing…
24/01644/FULL
Within ~100m

Nearby activity

2025 Approved
106G Cambridge Street London SW1V 4QG
Installation of replacement double glazed windows at fourth floor level.
25/05397/FULL
2025 Approved
110 Cambridge Street London SW1V 4QF
1 x whitebeam: remove four small branches as identified in the submitted photo.
25/06023/TCA
2025
88 Cambridge Street London SW1V 4QG
Reinstatement of windows to the elevation of Clarendon Street.
25/06404/FULL
2025 Approved
110 Cambridge Street London SW1V 4QF
1 x whitebeam: crown reduce to previous, most recent reduction points.
25/04191/TCA
2025
91 Alderney Street London SW1V 4HF
T1 Sycamore: Reduce by 2-3m on all aspects and compass points to shape Reason: Routine ma…
25/02875/TCA
2025
106A Cambridge Street London SW1V 4QG
T2 Lime: Reduce by 2-3m on all aspects and compass points to shape Reason: Routine mainte…
25/02876/TPO
2024
106A Cambridge Street London SW1V 4QG
T1 - Lime Actions - Re-pollard by 2m reduction Reasons - Traditional pruning of tree in c…
24/01976/TPO
2023 Approved
89 Alderney Street London SW1V 4HF
Replacement of the window at the screen under the entrance bridge, a window at lower grou…
23/02123/FULL
2023 Approved
Lower Ground Floor Flat 78 Alderney Street London SW1V 4EY
Alterations to vaults including partial excavation to front vaults and new front entrance…
23/03395/FULL
2023 Approved
Lower Ground Floor Flat 78 Alderney Street London SW1V 4EY
Alterations to vaults including partial excavation to front vaults, new front entrance ca…
23/03396/LBC
2023 Approved
110 Cambridge Street London SW1V 4QF
1 x Whitebeam (T1): Reduce crown sides back to the previous pruning points (approx. 1 met…
23/08029/TCA
2023 Approved
94 Cambridge Street London SW1V 4QG
T1 1 x sycamore: crown reduce to previous, most recent reduction points retaining shorten…
23/07644/TCA
2023 Approved
65 Gloucester Street London SW1V 4DZ
Installation of a black metal handrail to front entrance steps.
23/01177/FULL
2022 Approved
Flat 10 121 - 123 Alderney Street London SW1V 4HE
Installation of one air source heat pump located on roof.
22/08379/FULL
2022 Approved
77 Alderney Street London SW1V 4HF
1 x ash: crown reduce to previous, most recent reduction points.
22/08564/TCA
2022 Approved
25 Winchester Street London SW1V 4NZ
Retention of external gas pipe apparatus.
22/07304/FULL
2022 Approved
Flat 1 81 Alderney Street London SW1V 4HF
Replacement door and windows to rear elevation, and raising height of parapet and replace…
22/03804/FULL
2022 Approved
116 Cambridge Street London SW1V 4QF
1 x whitebeam (rear): fell
22/00101/TCA
2021 Approved
111 Alderney Street London SW1V 4HE
Retention of gas pipe apparatus within front basement lightwell.
21/08521/FULL
2021 Approved
91 Alderney Street London SW1V 4HF
1 x sycamore: crown reduce back to previous, most recent points of reduction.
21/07580/TCA
2016 Approved
17 Sussex Street London SW1V 4RR
Erection of a glazed extension at rear lower ground and ground floor levels.
16/11827/FULL
2016 Refused
106G Cambridge Street London SW1V 4QG
Alterations to the profile of the mansard roof and changes to the windows.
16/11104/FULL
2016 Approved
91 Alderney Street London SW1V 4HF
1 x sycamore (rear): Crown reduce to previous, most recent reduction points.
16/01948/TCA
2016 Approved
106 Cambridge Street London SW1V 4QG
1 x Lime (rear): crown reduce to previous, most recent reduction points, retaining shorte…
16/01956/TCA
2016 Approved
16 Winchester Street London SW1V 4NE
Reconstruction and extension of closet wing at rear second floor level.
16/00279/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

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

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.