12 Underhill Road London Southwark SE22 0AH Data via plota.co.uk

26/AP/2723 - Householder Application Under consideration/assessment
Extensions & alterations

Proposal

Proposed erection of a single-storey ground floor side infill extension; ground floor rear extension; formation of a first-floor rear roof terrace and insertion of glazed door/panels; alterations to existing first floor rear elevation roof profile; insertion of rooflights to front roof slope; front garden landscaping; facade glazing replacement to existing loft conversion rear elevation and facade alterations Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
15 Sept 2026
✓
Validated
16 Sept 2026
Decision
Expected by 10 Nov 2026

This application is under consideration - no decision has been issued yet. Plota predicts a decision around 6 Nov 2026, from Southwark's recent extensions.

Documents 14

Statements & assessments 1

PDF Fire Statement Fire Statement · 15 Sept 2026 View ↗

Plans & drawings 11

PDF 1336 - PR - 101 D PROPOSED GROUND FLOOR PLAN Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 102 D PROPOSED FIRST FLOOR PLAN Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 103 D PROPOSED SECOND FLOOR PLAN Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 104 D PROPOSED THIRD FLOOR PLAN Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 105 D PROPOSED ROOF PLAN Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 201 D PROPOSED FRONT ELEVATION Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 202 D PROPOSED REAR ELEVATION Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 203 D PROPOSED LEFT SIDE ELEVATION Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 204 D PROPOSED RIGHT SIDE ELEVATION Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 301 D PROPOSED SECTION A - A Plan - Proposed · 17 Sept 2026 View ↗ PDF 1336 - PR - 401 D PROPOSED BLOCK PLAN Plan - Proposed · 17 Sept 2026 View ↗

Application forms 2

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application - Form (Without Personal data) · 15 Sept 2026 View ↗ PDF COMMUNITY INFRASTRUCTURE LEVY - COMPLETED FORM CIL - GIA Form · 15 Sept 2026 View ↗

All documents on the council site ↗

Site constraints 7

Tree preservation order: 12 Underhill Road
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: Southwark 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 ↗
Also on the record
4 listed buildings within 150 m; Local nature reserve 451 m away: Sydenham Hill Wood and Fern Bank; Registered park or garden 189 m away: Horniman Gardens; Inside the Southwark built-up area; Conservation area 99 m away: Dulwich Wood.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 20 September 2026. Historic England, the Environment Agency, Natural England 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 3

Last sold for £2,562,500 in September 2025. Semi-detached house, freehold.

26 September 2025£2,562,500
22 December 2010£1,515,000
27 April 2007£875,000

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

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Other new applications on this street

31 Jul 2026Approved

92A Underhill Road London Southwark SE22 0QU

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29 Jul 2026Approved

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Construction of garden outbuilding, to be used as a home office, and all associa...

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13 Jul 2026Approved

5A Underhill Road London Southwark SE22 0BT

Non-Material Amendment (Section 96A) to Planning Permission 24/AP/1920 Reduction...

26/AP/2026
5 Jun 2026Approved

78 Underhill Road London Southwark SE22 0QT

Works to a tree with a TPO: T1 Oak tree - Tip back existing 8m lateral branches ...

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Nearby new applications

22 Sept 2026Pending

30 WOOD VALE, LONDON, SE23 3EE

Construction of a single storey infill extension at the rear, together with all ...

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3 Sept 2026Pending

350A Upland Road London Southwark SE22 0DP

Construction of a single storey ground floor side extension to the rear; and the...

26/AP/2618
18 Sept 2026Pending

22 HORNIMAN DRIVE, LONDON, SE23 3BP

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16 Sept 2026Approved

19 Wood Vale London Southwark SE23 3DS

Five day notification for tree works: Remove deadwood. Magnolia front garden.

26/AP/2756
14 Sept 2026Pending

104 WOOD VALE, LONDON, SE23 3ED

Alterations to an existing single storey extension including the relocation and ...

DC/26/145378
11 Sept 2026Pending

6 Dulwich Common London Southwark SE21 7EX

T1 Lawson's Cypress (Dulwich Estate Tree ID 8239) - approximately 7m in height a...

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Important details

Council
Southwark
Application type
Householder Application
Postcode
SE22 0AH
Received
15 Sept 2026
Validated
16 Sept 2026
Ward
Dulwich Wood
Parish
Dulwich
Case officer
Show
Target decision
10 Nov 2026
Applicant
Show
Agent
Design Squared Ltd

Decision outlook

Day 18 of the 56-day target. Southwark usually decides extensions by day 51.

Day 1838 days to the 56-day target
75%decided within 8 weeks
93%approved
642decided in the last year

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

Public comments

No public comments yet.

20 neighbours consulted · Last counted 26 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Statutory expiry
10 Nov 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

2025 Approved
Flat 4 22 Underhill Road London Southwark SE22 0AH
Installation of roof terrace on existing flat roof with obscure glass side screens and op…
25/AP/3517
2025
26 Underhill Road London Southwark SE22 0AH
Retention of reduced rear garden outbuilding for purposes incidental to the enjoyment of…
25/AP/1945
2025
20 Underhill Road London Southwark SE22 0AH
T1 - Dead ivy clad pear tree (left side of garden) - Fell to ground level / section disma…
25/AP/1814
2025
Bradbury Oak House 4 Underhill Road London Southwark SE22 0AH
Demolition of existing single storey rear extension, erection of one storey upwards roof…
25/AP/1149
2025
41 Wood Vale London Southwark SE23 3DS
Works to trees with a TPO: - T1 (Pear Tree): Remove branch 1 to junction. Reduce branch 2…
25/AP/1023
2025
26 Underhill Road London Southwark SE22 0AH
Part demolition and external alterations of existing outbuilding for home office use inci…
25/AP/0546
2024 Refused
26 Underhill Road London Southwark SE22 0AH
Proposed outbuilding to rear garden of property in use as C4 (HMO)
24/AP/3324
2024 Approved
5A Underhill Road London Southwark SE22 0BT
Construction of a ground floor wrap around side and rear extension, and new front entranc…
24/AP/1920
2024
18 Underhill Road London Southwark SE22 0AH
Works to a tree with a TPO: T2 Hornbeam, T3 Hawthorn, T4 Yew, T5 Yew, T6 Cypress, Remove…
24/AP/3111
2024 Approved
30 Underhill Road London Southwark SE22 0QT
5 Day Notification: Works to a Tree with a TPO: T1(Horse chestnut) felled and the stump g…
24/AP/2824
2023 Approved
35 Wood Vale London Southwark SE23 3DS
Tree works 5 day notification: Removal of the dead tree (Pyrus Pear)
23/AP/2812
2023 Approved
13 Underhill Road London Southwark SE22 0BT
T1 - XL Yew tree situated 4m from the front of the house. , Reduce in height by up to 2m…
23/AP/1910
2023 Approved
44 Melford Road London Southwark SE22 0AG
Construction of rear and side ground floor extension.
23/AP/1441
2023 Approved
35 Wood Vale London Southwark SE23 3DS
T1- Quercus (Oak) Rear left in neighbouring garden:- Crown lift as shown in photos by up…
23/AP/1387
2023 Refused
21 Underhill Road London Southwark SE22 0BT
Works to a TPO tree: Fell and eco plug the stump of x1 Oak (English) tree (T1)
23/AP/1121
2023 Refused
13 Streamline Mews London Southwark SE22 8SL
Our Ref: 249948 (b) fell and eco plug the stump of x1 Lime (Common) tree (T2) at 13 Strea…
23/AP/1122
2023 Approved
21 Underhill Road London Southwark SE22 0BT
Works to a TPO tree: x1 Oak (T1) - Root severance in relation to underpinning. Average fo…
23/AP/1123
2023 Approved
13 Streamline Mews London Southwark SE22 8SL
Works to a TPO tree: TPO 171 relation to root severance of x1 Lime (Common) (T2), install…
23/AP/1124
2023 Approved
13 Streamline Mews London Southwark SE22 8SL
Works to a TPO tree: T1 - Large Lime tree. Tree has significant die back in canopy, neigh…
23/AP/0622
2022 Approved
10 Underhill Road London Southwark SE22 0AH
Construction of a single storey rear extension with 1st floor screened roof terrace, side…
22/AP/4308
2019 Approved
Flats A B And C 11 Underhill Road London SE22 0BT
Replacement of existing windows to the front, side and rear elevations with white uPVC do…
19/AP/1470
2019 Approved
1C Underhill Road London SE22 0BT
Conversion of the existing garage into habitable accommodation and construction of a rear…
19/AP/0537
2018 Approved
25 Underhill Road London SE22 0BT
Minor material amendment to planning permission 18/AP/0692 granted for the 'Construction…
18/AP/2101
2018 Approved
25 Underhill Road London SE22 0BT
Construction of a ground floor rear extension
18/AP/1505
2018 Approved
25 Underhill Road London SE22 0BT
Construction of an outbuilding within the rear garden.
18/AP/0692
Southwark
Planning Authority Score
7/10
Good
#64 of 296 councils
Relevant to this application:
Householder decisions

Southwark is faster than most councils at deciding householder applications, ranking #54 out of 296. Householder applications are slightly more likely to be approved here (95%) than the national average (90%).

Faster than most councils
for householder decisions
These figures are council-wide context, not a prediction for this application. View full council performance
Southwark decision statistics
Based on MHCLG data, the year to March 2026
92%
Overall approval rate
Above avg (87%) #93 of 296
95%
Householder approved
Above avg (90%) #92 of 296
78%
Decided in 8 weeks
Above avg (63%) #54 of 296
37%
Extended time limit
Below avg (41%) #122 of 296
92%
Minor dwellings approved
259 decided (1-9 homes)
86%
Major dwellings approved
14 decided (10+ homes)
82%
Change of use approved
38 decided
1,622
Total decisions
132 refused in the year to March 2026
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.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use