4 Cornwall Mews South, London, SW7 4RZ Data via plota.co.uk

Consultation PP/26/03984
Extensions & alterationsSolar & renewables
Council
Kensington and Chelsea 5.1/10
Date received
29 Jul 2026
Date validated
29 Jul 2026
Postcode
SW7 4RZ

Description

Construction of mansard roof extension with 3 dormers to front and rear, set back from parapets. Alterations to fenestration including replacement of non-original windows and door with white timber framed, double glazed sash windows and traditional hardwood door. Rear windows to be 50% obscure-glazed, photovoltaic panels and enhanced thermal fabric. (AMENDED DESCRIPTION) Data via plota.co.uk

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Last checked

Decision outlook

Plota predicts a decision between 3 Oct 2026 and 20 Nov 2026, from Kensington and Chelsea's recent extensions.

Day 47 of the 56-day target. Kensington and Chelsea usually decides extensions by day 90.

Day 4743 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

Cornwall 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 - 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 Named permitted development rights are withdrawn here.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

3 Apr 2026Approved

8 Cornwall Mews West, London, SW7 4BH

Details required by Condition 3 (Construction Transport Management Plan) of plan...

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6 Brechin Place, London, SW7 4QA

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22 Victoria Road, London, W8 5RG

Alterations to existing rear extension, including replacement of existing glazed...

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12 Kensington Square, London, W8 5HE

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Variation of condition 2 (approved drawings) of listed building consent LB/23/03...

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7 Sept 2026Pending

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Historical activity at this location

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

This property

Previous applications at this address

2024 Approved
Alterations to glazing to rear elevation (Certificate of Lawful Proposed Use/Development)
CL/24/07173
2024 Approved
Alterations to elevations of existing property and introduction of roof terrace.
PP/24/05122
2024 Refused
Construction of mansard roof extension with 3no. dormers to front and rear, set back from…
PP/24/02080
2024 Approved
Basement extension beneath footprint of property and external alterations including previ…
PP/24/02435
2023 Refused
Construction of mansard roof extension at second floor level with 3no. dormers at front a…
PP/23/08483
2021 Approved
Removal of garage door, reconfigured windows and entrance door layout and introduction of…
PP/21/04997
2018 Approved
Alterations to elevations of property and introduction of roof terrace.
PP/18/03382
Within ~100m

Nearby activity

2025 Approved
Flat 5, 89 Cornwall Gardens, London, SW7 4AX
Internal alterations.
LB/25/02230
2025 Approved
Flat 14, 1-3 Cornwall Gardens, London, SW7 4AJ
Replacement of windows and doors at front and rear.
PP/25/03101
2024 Approved
84 Cornwall Gardens, London, SW7 4AY
Resurfacing of ground floor front ceramic tiled steps with new limestone
LB/24/08149
2024 Approved
84 Cornwall Gardens, London, SW7 4AY
Resurfacing of ground floor front ceramic tiled steps with new limestone
PP/24/08148
2024 Approved
10 Southwell Gardens, London, SW7 4SB
Installation of new gas pipework
PP/24/07438
2024 Approved
27 Cornwall Mews South, LONDON, SW7 4RZ
Installation of inward opening doors to living room, replacing existing glazing. Lowering…
PP/24/06268
2024 Approved
11 Southwell Gardens, LONDON, SW7 4SB
Installation of external pipework to supply gas to building
PP/24/04573
2024 Approved
106 Gloucester Road, LONDON, SW7 4RH
Variation of Condition 2 (Compliance with approved drawings) of planning permission PP/23…
PP/24/04690
2024 Approved
Flat 6, 100 Gloucester Road, LONDON, SW7 4AU
Erection of double-pitch mansard roof extension with 3no front and rear facing dormer win…
PP/24/04191
2024 Approved
Flat F, Basement, 53 Queen's Gate Gardens, London, SW7 5NF
Verification Order required to confirm the renumbering of Flat F, Basement, 53 Queen's Ga…
SNN/24/02291
2023 Approved
Rear entrance to Hotel (Cromwell Road), Southwell Gardens, London SW7 4RN
Provision of a pavement crossover.
PC/23/08195
2023 Approved
Flat 1, 82 Cornwall Gardens, LONDON, SW7 4AZ
Refurbishment including new WC, kitchen, coat cupboard, with additional soil pipe and ven…
LB/23/06521
2023 Approved
Flat 1, 82 Cornwall Gardens, LONDON, SW7 4AZ
Refurbishment including new WC, kitchen, coat cupboard, with additional soil pipe and ven…
PP/23/06520
2023 Approved
Flat 1, Campbell Court, 1-7 Queen's Gate Gardens, LONDON, SW7 4PB
FELL x 1 tree of heaven, prune x 2 tree of heaven x 1 hornbeam, x 1 ash x 1 un-named tree
ARB/23/08373
2023 Approved
106 Gloucester Road, London, SW7 4RH
Variation of condition 2 (approved drawings) of planning permission 18/05740 to reconfigu…
PP/23/05669
2023 Approved
Flat 6, 100 Gloucester Road, London, SW7 4AU
Variation of condition 2 (compliance with approved drawings) of planning permission 23/01…
PP/23/03263
2023 Approved
St Stephens Church, Southwell Gardens, London, SW7 4RL
FELL x 1 acacia tree (front garden)
ARB/23/03737
2023 Approved
Flats 1 and 2, 100 Gloucester Road, London, SW7 4AU
Amalgamation of Lower Ground Flat 1 with the Upper Ground Flat 2 into one dwelling, compr…
PP/23/03491
2023 Withdrawn
Flat 1, 82 Cornwall Gardens, London, SW7 4AZ
General refurbishment of Flat 1, including new WC, fitted kitchen, coat cupboard, with ad…
LB/23/03393
2023 Approved
8 Cornwall Mews South, London, SW7 4RZ
Replacement of roof-mounted tank enclosure with condensing units in acoustic enclosure
PP/23/02705
2016 Approved
Flat 7, 94 Cornwall Gardens, LONDON, SW7 4AX
Installation of moulded stone balustrade on front elevation first floor balcony to match…
PP/16/05604
2016 Withdrawn
12 Southwell Gardens, LONDON, SW7 4RL
Installation of gas pipe apparatus on side (Grenville Place) elevation. ***WITHDRAWN***
PP/16/06184
2016
**OBJECTIONS RECIVED** 108-110 Gloucester Road, London, SW7 4RJ
Proposed naming 'Art House' for residential block 108-110 Gloucester Road, LONDON, SW7
SNN/16/07375
2016 Approved
Campbell Court, 1-7 Queen's Gate Gardens, LONDON, SW7 4PD
FELL 4 x Tree of Heaven, 1 x Hawthorn, prune 1 x Hornbeam Major, 1 x Norway Maple Crown…
ARB/16/05980
2016 Approved
3 Cornwall Mews South, LONDON, SW7 4RZ
Alteration to front elevation, internal renovation and change butterfly pitched roof to f…
PP/16/05188
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