Flat 5, 51 Onslow Square, London, SW7 3LR Data via plota.co.uk

LB/26/04980 - Listed Building Consent Consultation
Extensions & alterations

Proposal

Renovation of timber windows on front elevation, replacing glass with double glazed units. Internal alterations and replacement of windows on rear elevations to match existing. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
15 Sept 2026
✓
Validated
17 Sept 2026
Decision
Expected by 12 Nov 2026

Under consideration

No decision has been issued yet. Plota predicts a decision between 19 Nov 2026 and 31 Dec 2026, from Kensington and Chelsea's recent extensions.

The consultation period closed on 16 Oct 2026.

Documents

View the documents on the council's website ↗

Site constraints 10

17 listed buildings within 150 m of the postcode pin
Nearest: 41-75, Onslow Square Sw7, Grade II, the postcode pin is inside its outline · 1 Grade II*, 16 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 17 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 Named permitted development rights are withdrawn here.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 951 m away: Thames Tideway Tunnel
The site is about 951 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 255 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 6b (excellent), TfL 2023, for the 100 m square; Designated open space about 24 m away; Town centre about 31 m away: South Kensington.
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.

Building

Floor area70 m² (753 sq ft)
Energy ratingD (68 out of 100), could reach C
PropertyFlat, 2 habitable rooms
BuiltBefore 1900
HeatingCommunity scheme
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in October 2025, 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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Other new applications on this street

28 Sept 2026Pending

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Details required by condition 3 Part B - Limb C (submission of details) of liste...

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Internal alterations to existing bathrooms, creation of a laundry room and assoc...

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Flat 8, 5 Onslow Square, London, SW7 3NJ

Internal alterations and replacement of windows on the front and rear elevations...

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12 Jun 2026Approved

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Important details

Council
Kensington and Chelsea
Application type
Listed Building Consent
Postcode
SW7 3LR
Received
15 Sept 2026
Validated
17 Sept 2026
Ward
Courtfield
Case officer
Show
Target decision
12 Nov 2026
Applicant
Show

Decision outlook

Day 42 of the 56-day target. Kensington and Chelsea usually decides extensions by day 83.

Day 4241 days to the predicted decision (day 83)
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
16 Oct 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Approved
Ground Floor, 23 Old Brompton Road, London, SW7 3HZ
Replacement of the existing awning canvas, powder coating for the metal front of the awni…
PP/25/06428
2025 Approved
Ground Floor, 23 Old Brompton Road, London, SW7 3HZ
Replacement of the existing awning canvas, powder coating for the metal front of the awni…
CA/25/06429
2025 Approved
23 Sumner Place, London, SW7 3EG
Provision of condenser unit within acoustic enclosure at rear lower ground floor lightwel…
PP/25/06076
2025 Approved
23 Sumner Place, London, SW7 3EG
Provision of condenser unit within acoustic enclosure at rear lower ground floor lightwel…
LB/25/06077
2025 Approved
Basement To First Floor Flat, 75 Onslow Square, London, SW7 3LS
Replacement of windows and doors with slimline glazing to front, side and rear elevations…
LB/25/05427
2025 Approved
Basement To First Floor Flat, 75 Onslow Square, London, SW7 3LS
Replacement of windows and doors with slimline glazing to front, side and rear elevations…
PP/25/05426
2025 Approved
Flat 3, 23 Sumner Place, London, SW7 3EG
Internal alterations and replacement of single glazed casement window on rear elevation w…
LB/25/03230
2025 Approved
Flat 3, 23 Sumner Place, London, SW7 3EG
Internal alterations and replacement of single glazed casement window on rear elevation w…
PP/25/03229
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 3, 55 Onslow Square and 57 Onslow Square, London, SW7 3LR
Part demolition to allow erection of orangery, lower ground rear extension, introduction…
PP/25/02621
2025 Approved
Flat 3, 55 Onslow Square and 57 Onslow Square, London, SW7 3LR
Part demolition to allow erection of orangery, lower ground rear extension, introduction…
LB/25/02622
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 Withdrawn
On highway outside, 7 Old Brompton Road, London, SW7 3HZ
Removal of an existing InLink Unit, and the deployment of a replacement Street Hub 3 unit…
PP/25/02161
2025 Withdrawn
On highway outside, 7 Old Brompton Road, London, SW7 3HZ
Removal of an existing InLink Unit, and the deployment of a replacement Street Hub 3 unit…
CA/25/02162
2024 Approved
Flat 3, 55 Onslow Square and 57 Onslow Square, London, SW7 3LR
Part demolition to allow erection of orangery, lower ground rear extension and internal w…
LB/24/06636
2024 Approved
Flat 3, 55 Onslow Square and 57 Onslow Square, London, SW7 3LR
Part demolition to allow erection of orangery, lower ground rear extension and internal w…
PP/24/06635
2024 Approved
75 Onslow Square, London, SW7 3LS
Relocation of basement substation to a series of adjacent vaults
LB/24/06473
2024 Approved
75 Onslow Square, London, SW7 3LS
Relocation of basement substation to a series of adjacent vaults
PP/24/06472
2018 Approved
Flat 1, 61 Onslow Square, LONDON, SW7 3LS
Internal alterations including partial removal of kitchen walls, adding double doors to f…
PP/18/03822
2018 Approved
Flat 1, 61 Onslow Square, LONDON, SW7 3LS
Internal alterations including partial removal of kitchen walls, adding double doors to f…
LB/18/03816
2018 Approved
25-27 Old Brompton Road, LONDON, SW7 3TD
Erection of Internally illuminated fascia sign (illuminated).
CA/18/03226
2018 Approved
25-27 Onslow Square, LONDON, SW7 3NJ
Roof renewal, external repairs, decorations and associated works at 25 Onslow Square (Lis…
LB/18/02802
2018 Approved
63 Onslow Square, LONDON, SW7 3LS
Variation of condition 2 (approved drawings) of planning permission 17/027634 to allow ne…
PP/18/02885
Kensington and Chelsea
Planning Authority Score
5.1/10
Average
#144 of 296 councils
Relevant to this application:
Other 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

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.