463 Cannon Hill Lane, Raynes Park, Merton, SW20 9HH Data via plota.co.uk

26/LDCP/1283 - Lawful Development Certificate - Proposed - Section 192 Approved

Proposal

Application for a lawful development certificate in respect of the proposed erection of a single storey rear extension, erection of a hip to gable roof extension and, rear dormer roof extension and insertion of X2 front rooflights Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
22 Jun 2026
✓
Approved
31 Jul 2026

Approved on 31 Jul 2026 · Delegated · Last checked 30 Sept 2026

Site constraints 6

Flood zone 2, rivers and sea
Medium chance: between a 1 in 100 and 1 in 1,000 annual chance from rivers, or 1 in 200 to 1 in 1,000 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
Air quality management area: Merton 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
Local nature reserve about 320 m away: Derwent Floodwash; Inside the Merton built-up area; Public transport access: PTAL 1b (very poor), TfL 2023, for the 100 m square.
Not affected
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, 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 £225,000 in January 2003. Terraced house, freehold.

15 January 2003£225,000
29 September 2000£140,000
31 October 1997£111,000

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

Building

Floor area89 m² (958 sq ft)
Energy ratingD (64 out of 100), could reach B
PropertyEnd-terrace house, 5 habitable rooms
Built1930 to 1949
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in June 2020, 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
Merton
Application type
Lawful Development Certificate - Proposed - Section 192
Postcode
SW20 9HH
Received
22 Jun 2026
Validated
22 Jun 2026
Ward
Lower Morden
Case officer
Show
Target decision
17 Aug 2026
Decision
Issue Certificate of Lawfulness
Decision date
31 Jul 2026
Decision level
Delegated
Applicant
Show
Agent
Gartwork Architecture Ltd

How this decision compares

Decided in 39 days from validation, 17 days faster than Merton's median of 56 for extensions. Approved, as 90% of extensions here are.

52%decided within 8 weeks
90%approved
1,414decided in the last year

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

Consultation & key dates

Statutory expiry
17 Aug 2026
Merton
Planning Authority Score
4.5/10
Below average
#173 of 296 councils
Relevant to this application:
Householder decisions

Merton ranks #196 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (92%) than the national average (90%).

These figures are council-wide context, not a prediction for this application. View full council performance
Merton decision statistics
Based on MHCLG data, the year to March 2026
89%
Overall approval rate
Above avg (87%) #135 of 296
92%
Householder approved
Above avg (90%) #158 of 296
57%
Decided in 8 weeks
Below avg (63%) #196 of 296
39%
Extended time limit
Below avg (41%) #139 of 296
54%
Minor dwellings approved
82 decided (1-9 homes)
100%
Major dwellings approved
11 decided (10+ homes)
83%
Change of use approved
24 decided
1,079
Total decisions
115 refused in the year to March 2026

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

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.