Fourth And Fifth Floor Flat, 21 Cornwall Gardens, London, SW7 4AW Data via plota.co.uk

PP/26/05446 - Planning Permission Consultation
Extensions & alterations

Proposal

External and internal alterations including installation of an air-conditioning condenser unit within acoustic enclosure on top of the flat roof of the mansard roof extension; replacement of double-glazed timber sash windows with slimline double-glazed timber sash windows at fourth-floor level on the rear elevation and fifth-floor level on the front elevation; replacement of timber sliding doors with new timber sliding doors at fifth-floor level on the rear elevation; resurfacing and re-waterproofing of the flat roof of the mansard roof extension; retention of an existing rooflight; and installation of new decking to the existing fifth-floor rear roof terrace Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
7 Oct 2026
Decision
Expected by 2 Dec 2026

Under consideration

No decision has been issued yet. Plota predicts a decision between 9 Dec 2026 and 20 Jan 2027, from Kensington and Chelsea's recent extensions.

Comments are open until 6 Nov 2026

Comment on this application ↗

Documents

View the documents on the council's website ↗

Site constraints 9

15 listed buildings within 150 m of the postcode pin
Nearest: 17-44, Cornwall Gardens Sw7, Grade II, the postcode pin is inside its outline · 15 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 15 with distances
Historic England ↗
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 Named permitted development rights are withdrawn here.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
National infrastructure project about 1570 m away: Thames Tideway Tunnel; Inside the Kensington and Chelsea built-up area; Public transport access: PTAL 6a (excellent), TfL 2023, for the 100 m square; Designated open space about 36 m away.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 13 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. 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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Other new applications on this street

15 Jun 2026Approved

Flat 7, 27 Cornwall Gardens, London, SW7 4AW

Demolition and rebuilding of existing conservatory on roof of 27 Cornwall Garden...

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5 Jun 2026Approved

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Internal reinstatement and regularisation works to lower ground floor flat, incl...

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25 Aug 2026Pending

Flat 6, 61 Cornwall Gardens and Flat 7, 60 Cornwall Gardens, London, SW7 4BE

Amalgamation of Flat 6, 61 Cornwall Gardens and Flat 7, 60 Cornwall Gardens to f...

LB/26/04600
18 Aug 2026Approved

11 Cornwall Gardens, London, SW7 4AL

Replacement of rear roofs at lower ground floor level with single flat roof, ext...

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Nearby new applications

13 Oct 2026Pending

1 Kelso Place, London, W8 5QD

Construction of single storey side infill extension; construction of single stor...

PP/26/05448
12 Oct 2026Pending

Flat 5, Boston House, 31 Collingham Road, London, SW5 0NS

Removal of single-glazed timber sash windows and replacement with new purpose-ma...

CL/26/00466
12 Oct 2026Pending

45 Hyde Park Gate, London, SW7 5DU

Prune 1 x Sycamore and 1 x Ailanthus

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9 Oct 2026Pending

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External landscaping works to provide sloped access to doors, paved area with cy...

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9 Oct 2026Pending

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Prune 1 x Holm Oak (rear)

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8 Oct 2026Pending

Flat A, Pentland House, 188 Cromwell Road, London, SW5 0SJ

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Important details

Council
Kensington and Chelsea
Application type
Planning Permission
Postcode
SW7 4AW
Received
7 Oct 2026
Validated
7 Oct 2026
Ward
Queen's Gate
Case officer
Show
Target decision
2 Dec 2026
Applicant
Show

Decision outlook

Day 12 of the 56-day target. Kensington and Chelsea usually decides extensions by day 83.

Day 1271 days to the predicted decision (day 83)
33%decided within 8 weeks
96%approved
1,426decided 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 →

Consultation & key dates

Comments by
6 Nov 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2018 Withdrawn
Flat 3, 24 Cornwall Gardens, London, SW7 4AW
Works to second floor flat including erection of rear extension, creation of external roo…
PP/18/01985
2025 Approved
Flat 2, 9 Cornwall Gardens, London, SW7 4AL
Internal refurbishment of flat including removal of existing partitions, finishes and fit…
LB/25/06435
2025 Approved
25 Launceston Place, London, W8 5RN
Prune 1 x Magnolia (rear)
ARB/25/06209
2025 Withdrawn
Flat 5, 8 Cornwall Gardens, London, SW7 4AL
Internal reconfiguration and refurbishment***Withdrawn***
LB/25/06312
2025 Approved
Flat 1, 24 Cornwall Gardens, London, SW7 4AW
Extension of rear external facade by 950mm over rear internal courtyard. Replacement of d…
PP/25/04975
2025 Approved
Flat 1, 24 Cornwall Gardens, London, SW7 4AW
Extension of rear external facade by 950mm over rear internal courtyard. Replacement of d…
LB/25/04976
2025 Approved
Flat 6, 9 Cornwall Gardens, London, SW7 4AL
Internal works to flat (Retrospective Application)
LB/25/05134
2025 Approved
20 Launceston Place, London, W8 5RL
Prune 1x Robinia at front
ARB/25/05861
2025 Approved
50 Victoria Road, London, W8 5RQ
Alterations to existing pitched main roof of building to create external roof plant area…
PP/25/02708
2025 Withdrawn
Flat 1, 24 Cornwall Gardens, London, SW7 4AW
Modification to guest bedroom including: Replacement of wooden window frame with a like-f…
PP/25/02336
2025 Approved
Flat 4, 36 Cornwall Gardens, London, SW7 4AP
Amended description: Minor internal layout changes to non-original studwork walls adjacen…
LB/25/00896
2025 Approved
Flat 4, 36 Cornwall Gardens, London, SW7 4AP
Amended description: Minor internal layout changes to non-original studwork walls adjacen…
PP/25/00895
2025 Approved
Flat 17, 15-16 Cornwall Gardens, London, SW7 4AN
Replacement of sliding doors onto external balcony. No alterations or works to any extern…
LB/25/00700
2025 Approved
Ground Floor Flat, 28 Cornwall Gardens, London, SW7 4AP
Internal alterations including exposing tiles in hallway; construction of en-suite bedroo…
LB/25/00384
2025 Approved
50 Victoria Road, London, W8 5RQ
Proposed rear landscaping works and other associated works, and alterations to fenestrati…
PP/25/00348
2025 Approved
79 Victoria Road, LONDON, W8 5RH
Prune 1 x Magnolia (rear)
ARB/25/00853
2025 Approved
49 Victoria Road, LONDON, W8 5RH
Prune 1 x Portuguese Laurel (front); Prune 1 x Pear and 1 x Evergreen Magnolia (rear)
ARB/25/00423
2024 Approved
Christ Church, Victoria Road, London, W8 5RQ
Prune 1 x Robinia (front)
ARB/24/08273
2024 Approved
75 Victoria Road, London, W8 5RH
Prune 3 x Olive, 1 x Hoheria, 1 x Acer (rear) and 1 x Magnolia (front)
ARB/24/08000
2024 Approved
35 Kynance Mews, LONDON, SW7 4QR
Conversion of garage to habitable space; internal and external alterations; installation…
PP/24/07100
2020 Approved
63 Victoria Road, LONDON, W8 5RH
Erection of single storey rear extension at lower ground floor level with terrace above…
PP/20/02364
2020 Approved
29 Launceston Place, LONDON, W8 5RN
Prune 1 x Olive (front) and 1 x Lawsons Cypress (rear)
ARB/20/03858
2020 Approved
55 Victoria Road, LONDON, W8 5RH
Prune 1 x Lilac - (front)
ARB/20/02225
2019 Approved
Flat G, 20 Cornwall Gardens, London, SW7 4AW
Relocation of air conditioning unit from chimney to rear roof
LB/19/07976
2019 Approved
Flat G, 20 Cornwall Gardens, London, SW7 4AW
Relocation of air conditioning unit from chimney to rear roof
PP/19/07975
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