13 Markham Square, London, SW3 4UY Data via plota.co.uk

PP/26/04043 - Planning Permission Approved
Extensions & alterations

Proposal

Creation of rear lower ground floor infill extension with ground floor level rear balcony above;?erection of rear staircase from rear balcony, ?alterations to rear fenestration and?cladding of front steps with Portland Stone? Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
24 Jul 2026
✓
Validated
3 Aug 2026
✓
Approved
19 Oct 2026

Approved on 19 Oct 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 Named permitted development rights are withdrawn here.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 461 m away: Thames Tideway Tunnel
The site is about 461 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 623 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
13 listed buildings within 150 m of the postcode pin; Registered park or garden about 148 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 11 m away; Town centre about 61 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.

Building

Floor area215 m² (2,314 sq ft)
Energy ratingD (63 out of 100), could reach B
PropertyMid-terrace house, 10 habitable rooms
BuiltBefore 1900
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in July 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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Important details

Council
Kensington and Chelsea
Application type
Planning Permission
Postcode
SW3 4UY
Received
24 Jul 2026
Validated
3 Aug 2026
Ward
Royal Hospital
Case officer
Show
Target decision
28 Sept 2026
Decision
Granted
Decision date
19 Oct 2026
Applicant
Show

How this decision compares

Decided in 77 days from validation, 6 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
16 Oct 2026

Historical activity at this location

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

This property

Previous applications at this address

2022 Approved
EDD - 15/02/22Prune x 1 blue gum (eucalyptus globulus)
ARB/22/00481
2021 Approved
Prune 1 x Ginko biloba tree in garden square.
ARB/21/02905
2020 Approved
Prune 1x Mimossa
ARB/20/02243
2017 Refused
Prune 1 x Robinia
ARB/17/00152
2016 Approved
Prune 1 x False Acacia
ARB/16/08415
2016 Approved
Prune 1 x Gingko Tree and 1 x Mimosa Tree
ARB/16/07048
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 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
58 Jubilee Place, London, SW3 3TQ
Prune 1x Magnolia at front
ARB/25/05687
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 Refused
Basement, Atlantic Court, 77 King's Road, London, SW3 4NX
Installation of 1No internally illuminated hanging sign, backlit illuminated fascia sign…
CA/25/03211
2025 Refused
Basement, Atlantic Court, 77 King's Road, London, SW3 4NX
Alterations to ground floor entrance (timber cladding) and display of a projecting sign…
PP/25/03210
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
Basement, Atlantic Court, 77 King's Road, London, SW3 4NX
Installation of AC unit located on first floor eternal plant deck; installation of full h…
PP/25/01565
2025 Approved
58 Jubilee Place, London, SW3 3TQ
Infill side extension at rear; installation of rooflights
PP/25/01722
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
2025 Withdrawn
36 Markham Street, London, SW3 3NR
Widening of front entrance steps and installation of ASHP on roof in relation to approved…
PP/25/00224
2024 Approved
58 Jubilee Place, London, SW3 3TQ
Replacement of windows to entrance elevation
PP/24/08126
2021 Withdrawn
46 Markham Street, LONDON, SW3 3NR
Construction of rear lower ground floor extension; modification to rear closet wing and f…
PP/21/03148
2021 Approved
3 Markham Place, LONDON, SW3 3JX
Prune 1 x Sycamore; Prune 1 x Sycamore and 1 x Lime (neighbouring garden)
ARB/21/01687
2021 Approved
9 Markham Street, LONDON, SW3 3NP
Construction of rear lower ground floor extension, first floor rear closet extension and…
PP/21/00891
2021 Approved
38 Jubilee Place, LONDON, SW3 3TQ
Rear extension at ground floor level; installation of door and window to rear elevation a…
PP/21/01239
2021 Approved
51 Elystan Place, LONDON, SW3 3JY
Relocation of current existing ground gloor window; replacement of current leaking skylig…
PP/21/01491
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

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.