170 Downton Avenue London Lambeth SW2 3TT Data via plota.co.uk

26/03052/FUL - Full Planning Permission Awaiting decision
Extensions & alterations

Proposal

Erection of a hip to gable and rear dormer extension including three roof lights to the front and a Juliet balcony to the rear. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
19 Oct 2026
Decision
Expected by 14 Dec 2026

Under consideration

No decision has been issued yet. Plota predicts a decision around 14 Dec 2026, from Lambeth's recent extensions.

Documents 11

Statements & assessments 1

PDF DESIGN AND ACCESS STATEMENT Design & Access Statement · 20 Oct 2026 View ↗

Plans & drawings 5

PDF BLOCK PLAN OF THE SITE Plans · 20 Oct 2026 View ↗ PDF EXISTING GROUND FLOOR, FIST FLOOR, ROOF AND SECTION PLANS AND ELEVATIONS Plans · 20 Oct 2026 View ↗ PDF DRAWING ISSUE SHEET Supporting Docs · 20 Oct 2026 View ↗ PDF PROPOSED GROUND FLOOR, FIRST FLOOR, SECOND FLOOR, ROOF AND SECTION PLANS AND FRO Plans · 20 Oct 2026 View ↗ PDF OS MAP AND BLOCK PLAN OS Map · 20 Oct 2026 View ↗

Application forms 2

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application Form · 20 Oct 2026 View ↗ PDF COMMUNITY INFRASTRUCTURE LEVY - COMPLETED FORM Supporting Docs · 20 Oct 2026 View ↗

Other documents 3

PDF COVERING LETTER Supporting Docs · 20 Oct 2026 View ↗ PDF PHOTOGRAPHS AND PHOTOMONTAGES Photo · 20 Oct 2026 View ↗ PDF PHOTOGRAPHS AND PHOTOMONTAGES Photo · 20 Oct 2026 View ↗

All documents on the council site ↗

Site constraints 7

Air quality management area: Lambeth 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 ↗
Conservation area 5 m away: Leigham Court Estate
The edge of the area; work outside it can still affect its setting.
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.
Local nature reserve 298 m away: Palace Road
Work nearby can need a habitats assessment.
Harm to a protected site is only accepted where there is no alternative and an overriding public interest.
Also on the record
Heritage at risk 5 m away: Leigham Court Estate, Streatham; 1 listed building within 150 m; Inside the Lambeth built-up area; Public transport access: PTAL 2 (poor), TfL 2023, for the 100 m square.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 28 October 2026. Historic England, the Environment Agency, Natural England, 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

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12 Jun 2026Approved

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Important details

Council
Lambeth
Application type
Full Planning Permission
Postcode
SW2 3TT
Received
19 Oct 2026
Validated
19 Oct 2026
Ward
Streatham Hill East
Case officer
Show
Target decision
14 Dec 2026
Applicant
Show

Decision outlook

Day 10 of the 56-day target. Lambeth usually decides extensions by day 56.

Day 1046 days to the 56-day target
59%decided within 8 weeks
82%approved
835decided in the last year

Plota live figures for extensions decided by Lambeth in the last twelve months, from validation. Lambeth decision record →

Public comments

No public comments yet.

Last counted 28 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Statutory expiry
14 Dec 2026
Env. assessment
No

Historical activity at this location

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

Within ~100m

Nearby activity

2024 Approved
134 Downton Avenue London SW2 3TT
Erection of a hip to gable roof extension incorporating a rear mansard with associated 2x…
24/01576/FUL
2024 Approved
128 Downton Avenue London Lambeth SW2 3TT
Erection of hip-to-gable roof extension with rear dormer and photovoltaic panels and inst…
24/00516/FUL
2024 Approved
149 Downton Avenue London SW2 3TX
Erection of a single storey ground floor rear extension. Erection of a hip to gable rear…
24/00283/FUL
2019 Approved
133 Downton Avenue London SW2 3TX
T1 Ash: Reduce canopy by 25% approximately 2-3m from height and width to shape - blocking…
19/04134/TCA
2022 Approved
Plot Between St Margaret's Church Hall And 104 Cricklade Avenue London Lambeth SW2 3HH
Erection of 3 terraced three-storey dwellinghouses with private gardens and the provision…
22/04098/FUL
2023 Approved
119 Downton Avenue London Lambeth SW2 3TX
Installation of a Twin Split Heat Pump and Air Conditioning System to the rear of the pro…
23/00807/FUL
2022 Withdrawn
119 Downton Avenue London SW2 3TX
Installation of a Twin Split Heat Pump and Air Conditioning System to the rear of the pro…
22/03142/FUL
2022 Approved
160 Downton Avenue London Lambeth SW2 3TT
Replacement of existing fencing to the front boundary including gate and replacement of b…
22/01870/FUL
2022 Withdrawn
147 Cricklade Avenue London Lambeth SW2 3HF
Conversion of existing single dwelling into two self contained flats.
22/00848/FUL
2022 Withdrawn
Plot Between St Margaret's Church Hall And 104 Cricklade Avenue London Lambeth SW2 3HH
Application for outline planning permission (with landscaping matters reserved) in relati…
22/00706/OUT
2021 Approved
119 Downton Avenue London SW2 3TX
Erection of a single storey ground floor rear extension and landscaping.
21/03904/FUL
2021 Approved
119 Downton Avenue London SW2 3TX
Erection of a single storey ground floor rear extension and landscaping.
21/03903/FUL
2021 Refused
119 Downton Avenue London SW2 3TX
Erection of a single storey ground floor rear extension and landscaping.
21/02983/FUL
2021 Withdrawn
135 Downton Avenue London SW2 3TX
Erection of a hip to gable roof extension incorporating rear dormer and 3 front roof ligh…
21/01926/FUL
2020 Approved
160 Downton Avenue London SW2 3TT
Erection of single storey ground floor rear extension and conversion of existing garage t…
20/04509/FUL
2020 Approved
145 Cricklade Avenue London SW2 3HF
Erection of single storey ground floor rear extension.
20/02751/FUL
2020 Approved
142 Downton Avenue London SW2 3TT
Erection of single storey ground floor extension.
20/02219/FUL
2019 Approved
129 Cricklade Avenue London SW2 3HF
Erection of part-1 part-2 storey rear extension (Retrospective).
19/03489/FUL
2019
133 Downton Avenue London SW2 3TX
T1 Ash: Reduce canopy by 25% approximately 2-3m from height and width to shape - blocking…
19/04134/TPO
2019 Approved
137 Cricklade Avenue London SW2 3HF
Erection of partial hip-to-gable roof extension and rear dormer with the installation of…
19/01029/FUL
2016 Refused
169 Barcombe Avenue London SW2 3BH
Replacement of window with door at roof level together with the installation of a balustr…
16/04651/FUL
2016 Approved
108 Wavertree Road London SW2 3ST
Erection of a single ground storey rear extension with one rooflight and addition of rear…
16/03087/FUL
2016 Refused
112 Cricklade Avenue London SW2 3HH
Replacement of existing windows to new UPVC windows at first floor rear and front elevati…
16/01429/FUL
2016 Withdrawn
193 Barcombe Avenue London SW2 3BH
Replacement of 3 front sash windows to match existing.
16/01988/FUL
2016 Approved
131 Downton Avenue London SW2 3TX
Loft conversion involving the erection of a hip to gable roof extension incorporating a r…
16/00687/FUL
Lambeth
Planning Authority Score
2.7/10
Poor
#242 of 296 councils
Relevant to this application:
Householder decisions

Lambeth ranks #164 out of 296 councils for householder decision speed. 47% of applications have the time limit extended, above the 41% national average. Lambeth is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.

One of the strictest councils
only 81% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Lambeth decision statistics
Based on MHCLG data, the year to March 2026
78%
Overall approval rate
Below avg (87%) #274 of 296
81%
Householder approved
Below avg (90%) #273 of 296
62%
Decided in 8 weeks
Below avg (63%) #164 of 296
47%
Extended time limit
Above avg (41%) #209 of 296
46%
Minor dwellings approved
70 decided (1-9 homes)
100%
Major dwellings approved
9 decided (10+ homes)
42%
Change of use approved
53 decided
1,784
Total decisions
396 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings