Flat A, 12 St Mark's Place, London, W11 1NT Data via plota.co.uk

Approved PP/26/03537
Extensions & alterations
Council
Kensington and Chelsea 5.1/10
Date received
8 Jul 2026
Date validated
8 Jul 2026
Decision date
2 Sept 2026
Postcode
W11 1NT

Description

Single storey conservatory extension Data via plota.co.uk

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Last checked

How this decision compares

Decided in 56 days from validation, 34 days faster than Kensington and Chelsea's median of 90 for extensions. Approved, as 96% of extensions here are.

32%decided within 8 weeks
96%approved
1,220decided in the last year

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

Site constraints 5

Ladbroke 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 - No 68 · Article 4 - No 100. Named permitted development rights are withdrawn here.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.
Tree preservation order
Consent is needed before work on protected trees.
Not every council has published its orders as open data, so no order shown is not proof there is none.
Air quality management area: Kensington and Chelsea 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 ↗
Also on the record
Inside the Kensington and Chelsea built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 11 September 2026. Historic England, the Environment Agency, Natural England 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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Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025 Approved
Talbot House, 10 Ladbroke Crescent, London, W11 1PS
Removal and replacement of pitched roof covering; removal of balcony glass infill panels…
PP/25/04585
2025 Approved
Flat A, 51 Blenheim Crescent, London, W11 2EF
Prune 1 x Ash (rear)
ARB/25/05102
2025 Approved
Flat 9 Penthouse, 6-8 Cornwall Crescent, London, W11 1PP
Rear extension at third floor level and front extension to enclose an existing recessed b…
PP/25/03086
2025 Approved
First Floor Flat, 58 Blenheim Crescent, London, W11 1NY
Construction of extension onto rear second floor terrace. Installation of low profile roo…
PP/25/01818
2025 Approved
Basement Flat, 3 Ladbroke Crescent, London, W11 1PS
Prune 1 x Laurel (T1) in rear garden.
ARB/25/02380
2024 Approved
71 Blenheim Crescent, London, W11 2EG
Installation of two external air conditioning condenser units to the mansard roof.
PP/24/08552
2025
1-20 Talbot House, 10 Ladbroke Crescent, LONDON, W11 1PS
Removal and replacement of pitched roof covering, and balcony glass infill panels. Replac…
PP/25/00582
2024 Approved
Hudson House, St Mark's Place, London, W11 1NU
FELL 1 x Cherry Tree in rear garden.
ARB/24/08288
2024 Approved
71 Blenheim Crescent, LONDON, W11 2EG
Replacement of single glazed windows with slimline double glazed like-for-like windows. R…
PP/24/03097
2024 Approved
Basement Flat, 1 Ladbroke Crescent, LONDON, W11 1PS
Prune 1 Cherry Laurel, 1 x Laburnum, 1 x Bay (rear)
ARB/24/03073
2023 Approved
Thomas Jones Primary School, St Mark's Road, LONDON, W11 1RQ
Installation of the air source heat pumps
PP/23/07913
2023 Withdrawn
Thomas Jones Primary School, St Mark's Road, London, W11 1RQ
Installation of air source and water to water heat pumps ***WITHDRAWN***
PP/23/05812
2023 Approved
Flat 1, 52 Blenheim Crescent, LONDON, W11 1NY
Rear side infill extension with double glazed lantern roof light, a new double glazed tim…
PP/23/04336
2023 Approved
60 Blenheim Crescent, London, W11 1NY
Replacement of ground floor single glazed windows with double glazed like for like
PP/23/04294
2023 Approved
Gardens, Dale Row, London
Prune as specified (front)
ARB/23/03342
2022 Withdrawn
14 Cornwall Crescent, London, W11 1PP
Division of property into a separate two bedroom lower and upper ground floor maisonette…
PP/22/01114
2022 Refused
6 St Mark's Place, LONDON, W11 1NS
Erection of a 2-storey lower and upper ground floor rear extension, replacement of single…
PP/22/05913
2023 Refused
60 Blenheim Crescent, LONDON, W11 1NY
Demolition of existing and construction of enlarged rooftop extension.
PP/23/01968
2023 Refused
60 Blenheim Crescent, LONDON, W11 1NY
Demolition of conservatory on the third floor and construction of enlarged rooftop extens…
PP/23/00959
2022 Approved
73 Blenheim Crescent, LONDON, W11 2EG
Erection of single-storey rear extension at lower ground floor level.
PP/22/06711
2016 Approved
First/second Floor Flat, 54 Blenheim Crescent, LONDON, W11 1NY
Extension of closet wing at rear second floor level, on half-landing level between first…
PP/16/03125
2016 Approved
54 Blenheim Crescent, LONDON, W11 1NY
Variation of condition 2 (Compliance with approved drawings) of PP/15/01955 to create a s…
PP/16/02934
2016 Refused
59 and 61 Blenheim Crescent, LONDON, W11 2EG
Creation of mansard roofs to both properties, with front and rear dormer windows, and roo…
PP/16/02142
2016 Approved
59 and 61 Blenheim Crescent, LONDON, W11 2EG
Alterations to No. 61 including reinstatement of bay windows to lower and ground floors…
PP/16/02367
2016 Withdrawn
79 Blenheim Crescent, LONDON, W11 2EG
Construction of replacement single storey rear extension ***WITHDRAWN***
PP/16/00991
Kensington and Chelsea
Planning Authority Score
5.1/10
Average
#144 of 296 councils
Relevant to this application:
Householder decisions

Kensington and Chelsea ranks #174 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (94%) than the national average (90%).

These figures are council-wide context, not a prediction for this application. View full council performance
Kensington and Chelsea decision statistics
Based on MHCLG data, the nine months to December 2025
93%
Overall approval rate
Above avg (87%) #58 of 296
94%
Householder approved
Above avg (90%) #110 of 296
61%
Decided in 8 weeks
Below avg (63%) #174 of 296
40%
Extended time limit
Below avg (41%) #152 of 296
94%
Minor dwellings approved
455 decided (1-9 homes)
87%
Change of use approved
53 decided
1,839
Total decisions
135 refused in the nine months to December 2025
Source: MHCLG planning statistics · See full council rankings