21 Crown Street, Harrow Hill, Harrow, HA2 0HX Data via plota.co.uk

PL/2499/25 - Householder Approved
Extensions & alterations

Proposal

Alterations to roof to form rear dormer, Roof light in rear roof slope Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
26 Sept 2025
✓
Validated
29 Sept 2025
✓
Approved
24 Nov 2025

Approved on 24 Nov 2025 · Delegated decision · Last checked 18 Oct 2026

Documents 14

Decision & officer reports 2

PDF Decision Notice DN - FULL and HSE Granted · 24 Nov 2025 View ↗ PDF Officer Report Delegated Report · 24 Nov 2025 View ↗

Statements & assessments 3

PDF Reasonable Exception Statement Supporting Info (Redacted) · 29 Sept 2025 View ↗ PDF Heritage statement Report/Assessment · 26 Sept 2025 View ↗ PDF Design & Access Statement Report/Assessment · 26 Sept 2025 View ↗

Plans & drawings 5

PDF Proposed Floor Plans & Elevation(s) Plans · 26 Sept 2025 View ↗ PDF Existing Floor Plan and Elevations Plans · 26 Sept 2025 View ↗ PDF Proposed Site Plan(s) Plans · 26 Sept 2025 View ↗ PDF Existing site Plan(s) Plans · 26 Sept 2025 View ↗ PDF location plan Plans · 26 Sept 2025 View ↗

Application forms 1

PDF Application Form Redacted Application Form (Redacted) · 26 Sept 2025 View ↗

Consultation & comments 2

PDF CONSERVATION COMMENTS Consultation · 24 Nov 2025 View ↗ PDF CAAC Minutes Consultation · 24 Nov 2025 View ↗

Other documents 1

PDF CIL CIL Document · 26 Sept 2025 View ↗

All documents on the council site ↗

Site constraints 8

Grade II listed: 26-26a, Crown Street
List entry 1358602 · 29 m away · 11 more listed buildings within 150 m (11 Grade II)
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 the other 11 with distances
Historic England ↗
Harrow on-the-Hill / Village 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 ↗
Archaeological priority area: (core area of Harrow on the Hill)
An assessment or field evaluation may be asked for before ground works.
The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.
Air quality management area: Harrow 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 ↗
Habitat network: Network Enhancement Zone 2
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Also on the record
Registered park or garden 144 m away: Harrow Park (Formerly Flambards); Inside the Harrow 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 2 November 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.

Sales history 3

Last sold for £590,000 in November 2023. Terraced house, freehold.

24 November 2023£590,000
5 November 2018£530,000
16 June 2001£56,000

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

Building

Floor area78 m² (840 sq ft)
Energy ratingD (67 out of 100), could reach B
PropertyMid-terrace house, 3 habitable rooms
Built1967 to 1975
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in August 2023, 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
Harrow
Application type
Householder
Postcode
HA2 0HX
Received
26 Sept 2025
Validated
29 Sept 2025
Ward
Harrow on the Hill
Case officer
Show
Target decision
24 Nov 2025
Decision
Grant Conditionally
Decision date
24 Nov 2025
Decision level
Delegated decision
Applicant
Show
Agent
MTL Architects

How this decision compares

Decided in 56 days from validation, about the council's usual 56 days. Approved, as 78% of extensions here are.

81%decided within 8 weeks
78%approved
1,884decided in the last year

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

Consultation & key dates

Statutory expiry
24 Nov 2025

Historical activity at this location

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

This property

Previous applications at this address

2023 Approved
Alterations to roof; rear dormer; two rooflights in rear roofslope
P/0025/23
2021 Approved
Alterations to roof; rear dormer
P/3656/21
Within ~100m

Nearby activity

2025 Approved
31, Leigh Court Byron Hill Road, Harrow On The Hill, Harrow, HA2 0HZ
Byron Hill Conservation Area T1 Magnolia: Reduce and shape canopy by 1.5m in height and r…
PL/3033/25
2025 Approved
26, Leigh Court Byron Hill Road, Harrow On The Hill, Harrow, HA2 0HZ
T1: Eucalyptus (globulus) located on the lefthand side of the rear garden – request to Fe…
PL/3035/25
2025 Approved
56 Crown Street, Harrow Hill, Harrow, HA2 0HR
Harrow on the Hill Village Conservation Area Ash (rear garden): Crown Reduce by up to 30%…
PL/2264/25
2025 Approved
31, Leigh Court Byron Hill Road, Harrow On The Hill, Harrow, HA2 0HZ
Byron Hill Road Conservation Area T1 Eucalyptus (rear garden): Outgrown location. Remove
PL/1313/25
2025
3 Wellington Terrace, Harrow On The Hill, Harrow, HA1 3EP
Replacement windows in front elevation
PL/1169/25
2025 Approved
36 Crown Street, Harrow Hill, Harrow, HA2 0HR
Replacement stairs to front elevation, Replacement door and window in ground floor front…
PL/0563/25
2025 Refused
19 Crown Street, Harrow Hill, Harrow, HA2 0HX
Replacement door to storage cupboard in front elevation, Detached outbuilding at side for…
PL/0370/25
2024 Approved
19 Crown Street, Harrow Hill, Harrow, HA2 0HX
Replacement and enlargement of ground floor patio doors in rear elevation
PL/2540/24
2024 Approved
10 Waldron Road, Harrow On The Hill, Harrow, HA2 0HU
Single storey rear conservatory extension (demolition of conservatory)
PL/1049/24
2024 Approved
32, Leigh Court Byron Hill Road, Harrow On The Hill, Harrow, HA2 0HZ
T1 Sycamore (front communal garden area next to the carpark ): Reduce and shape canopy by…
PL/0664/24
2024 Approved
36 Crown Street, Harrow Hill, Harrow, HA2 0HR
Replacement of front door and all windows; existing ground floor level to be lowered; sin…
PL/0469/24
2024 Approved
13 Wellington Terrace, Harrow On The Hill, Harrow, HA1 3EP
Harrow on the Hill Village Conservation Area SG1 - Mixed species shrubs including Viburnu…
PL/0349/24
2023 Approved
8, Leigh Court Byron Hill Road, Harrow On The Hill, Harrow, HA2 0HZ
T1 Cypress (rear garden, r/hand boundary): Cypress has outgrown its location. Fell to gro…
P/2310/23
2023 Approved
14 Waldron Road, Harrow On The Hill, Harrow, HA2 0HU
Replacement windows in front elevation
P/1618/23
2023 Approved
19 Victoria Terrace, Harrow On The Hill, Harrow, HA1 3EW
Details pursuant to Conditions 5 (Materials), 6 (Construction Method Statement and Logist…
P/1645/23
2023 Refused
27 Crown Street, Harrow Hill, Harrow, HA2 0HX
Single storey rear extension; external alterations (demolition of rear extension)
P/1579/23
2023 Approved
56 West Street, Harrow On The Hill, Harrow, HA1 3EN
Single storey rear extension (Partial Demolition of single storey rear extension)
P/1026/23
2023 Approved
59 Crown Street, Harrow Hill, Harrow, HA2 0HX
Tree number - T1 Tree type - Ash (Fraxinus excelsior) Approx Height - 14m Approx Crown Sp…
P/0498/23
2023 Approved
14, Leigh Court Byron Hill Road, Harrow On The Hill, Harrow, HA2 0HZ
T1 Alder (rear garden, left-hand side): Outgrown location. Fell to ground level. T2 Golde…
P/0653/23
2023 Approved
60 Crown Street, Harrow Hill, Harrow, HA2 0HR
T1 Yew (front): Reshape / rebalance crown T2 Whitebeam (side): Reduce height by 1m. Reduc…
P/0342/23
2016 Approved
65 Crown Street, Harrow, HA2 0HX
4 X silver birch (front garden left boundary): crown reduce by removing approximately 3-4…
P/3608/16
2016 Approved
59 Crown Street, Harrow, HA2 0HX
Horse chestnut (aesculus hippocastanum) (t1) (approximate height 15m) rear garden rear bo…
P/2340/16
2016 Approved
Garages Adjacent 1, Victoria Terrace, Harrow, HA1 3EW
2 Prunus trees: cut back re-growth from telephone wires & street light. 1 Thorn tree: red…
P/2813/16
2016 Approved
48 Crown Street, Harrow, HA2 0HR
Single storey rear extension
P/0853/16
2016
6 Crown Street, Harrow, HA2 0HR
Installation of two rooflights in rear roofslope
P/3967/15/4934
Harrow
Planning Authority Score
4.9/10
Below average
#153 of 296 councils
Relevant to this application:
Householder decisions

Harrow ranks #115 out of 296 councils for householder decision speed. Harrow is also one of the strictest councils - it refuses more householder applications than almost any other, with only 83% approved vs 90% nationally.

One of the strictest councils
only 83% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Harrow decision statistics
Based on MHCLG data, the year to March 2026
78%
Overall approval rate
Below avg (87%) #273 of 296
83%
Householder approved
Below avg (90%) #261 of 296
71%
Decided in 8 weeks
Above avg (63%) #115 of 296
33%
Extended time limit
Below avg (41%) #77 of 296
44%
Minor dwellings approved
133 decided (1-9 homes)
80%
Major dwellings approved
5 decided (10+ homes)
38%
Change of use approved
26 decided
1,330
Total decisions
298 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

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.