49 Blenheim Crescent, London, W11 2EF Data via plota.co.uk

Consultation PP/26/03554
Extensions & alterationsNew homes
Council
Kensington and Chelsea 5.1/10
Date received
2 Jul 2026
Date validated
2 Jul 2026
Postcode
W11 2EF

Description

Increase size of mansard roof rear addition and enlarge front dormer window, provision of rooflights, access hatch and condenser unit within acoustic enclosure at main roof level, alterations and additions to fenestration, erection of single storey rear extension at lower ground floor level with replacement terrace above, extension at second floor level and subdivision of dwelling to create self-contained studio unit (1b1p) within front lower ground floor, and maisonette (4b5p) across lower ground to third floor… Data via plota.co.uk

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Last checked

Decision outlook

Plota predicts a decision by 24 Oct 2026, from Kensington and Chelsea's recent extensions.

Day 74 of the 56-day target. Kensington and Chelsea usually decides extensions by day 90.

Day 7416 days to the predicted decision (day 90)
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 Named permitted development rights are withdrawn here.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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Other new applications on this street

5 May 2026Approved

23 Blenheim Crescent, London, W11 2EF

Replacement sash & casement windows with heritage style double glazed sash & cas...

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7 Jul 2026Pending

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25 Jun 2026Approved

125 Blenheim Crescent, London, W11 2EQ

Proposed installation of two wall mounted electric retractable awnings to existi...

PP/26/03387
12 Jun 2026Pending

89 Blenheim Crescent, London, W11 2EQ

Retention of two air condenser units within an acoustic enclosure, in the rear g...

PP/26/03065

Nearby new applications

9 Sept 2026Pending

12 Avondale Park Gardens, London, W11 4PR

FELL 1 x Olive Tree (T2) in front garden.

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8 Sept 2026Pending

80 Oxford Gardens, London, W10 5UW

Permission sought for a pavement crossover and general arrangement.

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7 Sept 2026Pending

22 Kensington Park Gardens, London, W11 3HD

Removal of modern fittings, appliances and finishes and the demolition of a non-...

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22 Kensington Park Gardens, London, W11 3HD

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4 Sept 2026Pending

Flat A, 69 Oxford Gardens, London, W10 5UJ

Installation of single-storey garden room(3.2m x 2.5m) with timber and cement-bo...

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2 Sept 2026Pending

82 Cambridge Gardens, London, W10 6HS

Prune 1x Lime in rear garden

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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

2023 Approved
Alterations at main roof level to increase size of mansard roof addition to the rear and…
PP/23/08143
Within ~100m

Nearby activity

2025 Approved
Flat A, 51 Blenheim Crescent, London, W11 2EF
Prune 1 x Ash (rear)
ARB/25/05102
2025 Approved
Maisonette Lower Ground and Ground Floor, 47 Blenheim Crescent, LONDON, W11 2EF
FELL 1 x Prunus (rear)
ARB/25/00482
2025 Approved
Galsworthy House, Elgin Crescent, LONDON, W11 2JW
FELL 1 x Silver Maple (front)
ARB/25/00175
2024 Approved
Lower Ground And Ground Floor Maisonette, 86 Ladbroke Grove, LONDON, W11 2HE
Prune 2 x Silver Birch (Betula pendula) in rear garden
ARB/24/07701
2024 Approved
Basement and Ground Floor Flat, 25 Blenheim Crescent, LONDON, W11 2EF
Prune 1 x Robinia (Robinia psuedacacicia) in rear garden
ARB/24/04147
2024 Approved
Basement/ground Floor Flat, 27 Blenheim Crescent, LONDON, W11 2EF
Prune 1 x Ash (rear)
ARB/24/02478
2023 Withdrawn
Third Floor Flat, 27 Blenheim Crescent, LONDON, W11 2EF
Removal of butterfly roof and provision of roof terrace to third floor flat. Installation…
PP/23/02693
2022 Approved
First To Third Floor Flat, 25 Blenheim Crescent, LONDON, W11 2EF
Installation of glazed box on top of stairs for roof terrace access, new skylights and an…
PP/22/05563
2022 Approved
5 Codrington Mews, LONDON, W11 2EH
Construction of single storey basement; installation of air source heat pump within loft…
PP/22/07166
2022 Approved
Maisonette Lower Ground and Ground Floor, 47 Blenheim Crescent, LONDON, W11 2EF
Fell 1 x Birch (rear)
ARB/22/04342
2022 Withdrawn
5 Codrington Mews, LONDON, W11 2EH
Renovation of house including construction of single storey basement; installation of air…
PP/22/04020
2022 Approved
5 Codrington Mews, LONDON, W11 2EH
Creation of a single dwelling house across ground and first floors, along with associated…
PP/22/00665
2021 Approved
First To Third Floor Flat, 25 Blenheim Crescent, London, W11 2EF
Replacement of original windows with like-for-like double glazed, timber units; introduct…
PP/21/07847
2021 Withdrawn
First To Third Floor Flat, 25 Blenheim Crescent, London, W11 2EF
Installation of a double glazed greenhouse and solar panels on the roof terrace; replacem…
PP/21/07844
2021 Withdrawn
5 Codrington Mews, London, W11 2EH
Renovation, including construction of basement storey, installation of air source heat pu…
PP/21/06970
2021 Refused
32 Elgin Crescent, London, W11 2JR
Creation of basement level with associated lightwells, extension of existing front lightw…
PP/21/06140
2021 Approved
Lower Ground And Ground Floor Maisonette, 86 Ladbroke Grove, LONDON, W11 2HE
Prune 2 x Silver Birch (rear)
ARB/21/05832
2021 Approved
23 Blenheim Crescent, LONDON, W11 2EF
FELL 1x Ash in rear garden
ARB/21/01987
2021 Approved
25 Blenheim Crescent, LONDON, W11 2EF
Prune 1 x Acacia (rear)
ARB/21/01897
2020 Refused
87 Ladbroke Grove, LONDON, W11 2HD
Replacement of front and rear windows at first floor level with like for like double glaz…
PP/20/07221
2017 Approved
4 Codrington Mews, LONDON, W11 2EH
Removal of condition 7 (EcoHomes BREEAM) of planning permission 14/005042
PP/17/01676
2017 Refused
4 Codrington Mews, LONDON, W11 2EH
Variation of condition 2 (approved drawings) of planning permission 14/05042 to allow all…
PP/17/00998
2016 Refused
84 Ladbroke Grove, LONDON, W11 2HE
Amalgamation of two existing flats (B & C) into one two bedroom flat.(Certificate of Prop…
CL/16/03705
2016 Approved
7 Codrington Mews, LONDON, W11 2EH
Construction of basement under existing footprint of basement with alterations to upper f…
PP/16/00648
2016 Approved
Flat 9, Galsworthy House, Elgin Crescent, LONDON, W11 2JW
Prune 1 x Silver Maple
ARB/16/00761
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