Basement Flat and House excluding Basement, 40 Markham Square, London, SW3 4XA Data via plota.co.uk

PP/26/03584 - Planning Permission Approved
Extensions & alterationsUtility infrastructure

Proposal

Replacement of windows, installation of new downpipe to front elevation; removal of existing external staircase and installation of new steel staircase; addition of lightwell to rear; removal of external water tank and installation of air-conditioning unit and associated works Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
2 Jul 2026
✓
Approved
27 Aug 2026

Approved on 27 Aug 2026 · Last checked 19 Oct 2026

Documents

View the documents on the council's website ↗

Site constraints 11

Chelsea 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 Named permitted development rights are withdrawn here.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 436 m away: Thames Tideway Tunnel
The site is about 436 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 584 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 ↗
17 listed buildings within 150 m of the postcode pin
Nearest: Markham Arms Public House, Grade II, about 36 m from the postcode pin · 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 ↗
Also on the record
Registered park or garden about 103 m away: ROYAL HOSPITAL, CHELSEA and RANELAGH GARDENS; Inside the Kensington and Chelsea built-up area; Public transport access: PTAL 5 (very good), TfL 2023, for the 100 m square; Designated open space about 18 m away; Town centre about 36 m away: King's Road (east).
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.

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Important details

Council
Kensington and Chelsea
Application type
Planning Permission
Postcode
SW3 4XA
Received
2 Jul 2026
Validated
2 Jul 2026
Ward
Royal Hospital
Case officer
Show
Target decision
27 Aug 2026
Decision
Granted
Decision date
27 Aug 2026
Applicant
Show

How this decision compares

Decided in 56 days from validation, 27 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
31 Jul 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
49 Markham Street, London, SW3 3NR
Adaptation and extension of rear canted bay into orthogonal bay, second floor infill exte…
PP/25/05189
2025 Approved
Basement/ground Floor Flat, 3 Smith Street, London, SW3 4EE
Replacement of three windows like for like at ground floor level
LB/25/05569
2025 Refused
71 King's Road, London, SW3 4NX
Removal of blade sign and installation of decorative features to 2no. piers to front fa?a…
PP/25/05255
2025 Approved
8 Markham Square, London, SW3 4UY
Demolition and rebuild of the dwelling house behind a retained fa?ade to include provisio…
PP/25/04365
2025 Approved
49 Markham Street, London, SW3 3NR
Partial side return extension at lower ground floor; alterations to rear existing opening…
PP/25/04956
2025 Approved
31 Bywater Street, London, SW3 4XH
Extension and alteration including new subterranean level.
PP/25/03338
2025 Approved
Gardens, Markham Square, London, SW3
Prune 1 x Eucalyptus (T1), 1 x Robinia Frisia (T2), and 2 x Sycamore (T3 and T4), all in…
ARB/25/03859
2025 Approved
42 Markham Square, London, SW3 4XA
Construction of three-storey extension to rear closet wing and and single storey lower gr…
PP/25/03208
2025 Approved
9 Markham Street, London, SW3 3NP
Demolition of rear single storey boiler room, side infill and closet wing lower ground fl…
PP/25/03054
2025 Approved
Ranelagh House, 3-5 Elystan Place, London, SW3 3LE
Replacement of external cladding and render of Ranelagh House (North block and South bloc…
CL/25/03233
2025 Withdrawn
49 Smith Street, London, SW3 4EP
Upgrading of two front windows on the ground floor from single glazed timber sash windows…
LB/25/01025
2025 Withdrawn
49 Smith Street, London, SW3 4EP
Upgrading of two front windows on the ground floor from single glazed timber sash windows…
PP/25/01024
2025 Approved
Gardens, Markham Square, London
Prune 1 x Mimosa, 1 x Robinia Frisia, 1 x Eucalyptus Gunnii, 1 x Prunus Avium
ARB/25/02032
2025 Approved
42 Markham Square, London, SW3 4XA
Prune 1x Saucer Magnolia in rear garden
ARB/25/02071
2025 Approved
26 Markham Square, London, SW3 4UZ
Extension of existing lower ground floor level vault beneath the front garden with a roof…
PP/25/00752
2024 Approved
138 King's Road, London, SW3 4XB
Conversion of redundant banking premises to fashion retail store with refurbishment of fr…
LB/24/07788
2024 Approved
138 King's Road, London, SW3 4XB
Conversion of redundant banking premises to fashion retail store with refurbishment of fr…
PP/24/07787
2024 Approved
6 Markham Square, London, SW3 4UY
Prune 1 x Horse Chestnut (rear)
ARB/24/08261
2024 Approved
41 Elystan Place, LONDON, SW3 3JY
Provision of condenser units with an acoustic enclosure located within front lightwell at…
PP/24/07512
2024 Approved
120 King's Road, 118-122 King's Road and 7-9 Tryon Street, LONDON, SW3 4TR
Proposal to introduce plant and associated enclosure on ground floor at rear of building.
PP/24/06659
2021 Approved
35 Markham Square, London, SW3 4XA
Prune 1 x Bay (rear)
ARB/21/07199
2021 Approved
32 Markham Square, London, SW3 4XA
Installation of two air conditioning units within single enclosure on main roof level, re…
PP/21/06496
2021 Approved
4 Markham Street, LONDON, SW3 3NP
Installation of air conditioning condensing unit on main roof, housed in slatted timber e…
PP/21/05384
2021 Approved
134-136 King's Road, LONDON, SW3 4XB
Relocation of condenser units on rear flat roof, with installation of acoustic enclosures…
PP/21/05027
2021 Approved
Pavement outside 49 King's Road, LONDON, SW3 4ND
Replacement of existing telephone kiosk with new telephone kiosk, which includes integrat…
PP/21/04638
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