Flat 8, 5 Onslow Square, London, SW7 3NJ Data via plota.co.uk

PP/26/04397 - Planning Permission Approved
Extensions & alterations

Proposal

Internal alterations and replacement of windows on the front and rear elevations at third and fourth floor levels with double glazed units Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
14 Aug 2026
✓
Validated
19 Aug 2026
✓
Approved
9 Oct 2026

Approved on 9 Oct 2026 · Last checked 18 Oct 2026

Documents

View the documents on the council's website ↗

Site constraints 10

19 listed buildings within 150 m of the postcode pin
Nearest: 1-7, Onslow Square Sw7, Grade II, the postcode pin is inside its outline · 4 Grade II*, 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 19 with distances
Historic England ↗
Thurloe/Smith's Charity 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 Named permitted development rights are withdrawn here.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 ↗
National infrastructure project about 925 m away: Thames Tideway Tunnel
The site is about 925 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, about 323 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 ↗
Also on the record
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 32 m away; Town centre about 62 m away: Brompton Cross.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 6 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.

Sales history 1

Last sold for £625,000 in January 1995. Flat or maisonette, leasehold.

16 January 1995£625,000

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

Building

Floor area211 m² (2,271 sq ft)
Energy ratingE (45 out of 100), could reach C
PropertySemi-detached flat, 5 habitable rooms
Built1900 to 1929
HeatingCommunity scheme
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in February 2024, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate

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Important details

Council
Kensington and Chelsea
Application type
Planning Permission
Postcode
SW7 3NJ
Received
14 Aug 2026
Validated
19 Aug 2026
Ward
Brompton and Hans Town
Case officer
Show
Target decision
14 Oct 2026
Decision
Granted
Decision date
9 Oct 2026
Applicant
Show

How this decision compares

Decided in 51 days from validation, 32 days faster than Kensington and Chelsea's median of 83 for extensions. Approved, as 95% of extensions here are.

33%decided within 8 weeks
95%approved
1,441decided 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
11 Sept 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Withdrawn
2 Sydney Place, London, SW7 3NN
***Withdrawn***Replacement of vehicular gate to rear of property and erection of car port
LB/25/05508
2025 Withdrawn
2 Sydney Place, London, SW7 3NN
***Withdrawn***Replacement of hardstanding with natural stone and erection of single stor…
LB/25/05512
2025 Withdrawn
2 Sydney Place, London, SW7 3NN
***Withdrawn***Replacement of vehicular gate to rear of property and erection of car port
PP/25/05507
2025 Withdrawn
2 Sydney Place, London, SW7 3NN
***Withdrawn***Replacement of hardstanding with natural stone and erection of single stor…
PP/25/05511
2025 Approved
Flat 1, 23 Onslow Square, London, SW7 3NJ
Replacement of 3no. sets of French doors at first floor front elevation with replica door…
PP/25/04313
2025 Approved
Flat 1, 23 Onslow Square, London, SW7 3NJ
Replacement of 3no. sets of French doors at first floor front elevation with replica door…
LB/25/04314
2025 Approved
Flat 12, Avenue Studios, Sydney Close, London, SW3 6HW
Prune 1x Mimosa overhanging 12 Sydney Close
ARB/25/03942
2025 Approved
2 Sydney Place, London, SW7 3NN
Prune 1 x Tree of heaven (front)
ARB/25/02857
2025 Approved
1 Pelham Place, London, SW7 2NQ
Prune 1 x Cherry (front)
ARB/25/03484
2025 Approved
Flat 10, 25 Onslow Square, London, SW7 3NJ
Like for like replacement of three rear-facing windows and one side elevation metal windo…
LB/25/02491
2025 Approved
Flat 10, 25 Onslow Square, London, SW7 3NJ
Internal alterations including replacement of existing floor finishes and refurbishing tw…
LB/25/02361
2025 Approved
2 Onslow Square, LONDON, SW7 3NP
Replacing the large bathroom with a smaller bathroom and shower; removal of a non-origina…
LB/25/00282
2024 Withdrawn
2 Onslow Square, London, SW7 3NP
Creation of second shower room at first floor level. Installation of cornice in reception…
LB/24/07664
2024 Approved
17-19 Pelham Place, LONDON, SW7 2NQ
Proposed enhancement of rear garden hard and soft landscaped areas including erection of…
LB/24/06155
2024 Approved
17-19 Pelham Place, LONDON, SW7 2NQ
Proposed enhancement of rear garden hard and soft landscaped areas including erection of…
PP/24/06154
2024 Decided
17-19 Pelham Place, LONDON, SW7 2NQ
Prune 2 x Apple (front)
ARB/24/06435
2024 Approved
2-42 Onslow Square, LONDON, SW7 3NP
Prune 1 x Catalpa bignonioides (Indian Bean Tree) rear of 18 Onslow Square
ARB/24/05608
2024 Approved
19 Onslow Square, LONDON, SW7 3NJ
Installation of two fire rated doors in basement communal hallway.
LB/24/06173
2024 Approved
169 Fulham Road, LONDON, SW3 6SP
Variation of Condition 2 (compliance with approved drawings) of planning permission PP/23…
PP/24/04780
2024 Withdrawn
Flat 1, 17 Onslow Square, LONDON, SW7 3NJ
Installation of heat pump at rear of building.
PP/24/04819
2021 Approved
11-23 Onslow Square, LONDON, SW7 3NJ
FELL 1 x Salix in rear communal gardens.
ARB/21/01914
2020 Approved
Park Cottage, 7-11 Onslow Square, LONDON, SW7 3NJ
Prune 2 x Sycamore
ARB/20/06212
2020 Approved
Flat 1, 5 Onslow Square, LONDON, SW7 3NJ
Prune 1 x Holly
ARB/20/06213
2020 Approved
5 Sydney Place, LONDON, SW7 3NN
Prune 1x Birch at rear garden
ARB/20/05645
2020 Approved
12 Sydney Place, LONDON, SW7 3NL
FELL 1x Pittosporum
ARB/20/04981
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

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

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.