Data-backed planning intelligence · 3,780,000+ decisions analysed across England

Most Common Planning Applications in Merton

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Merton is 37.0% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

18,193 real decisions·17 project types·Updated August 2026
92.6%
Safest: Conservatory
55.6%
Lowest: HMO
37.0%
Spread
17
Types ranked

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All 17 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory29927722
92.6%
2Basement58353350
91.4%
3Loft Conversion3,9063,513393
89.9%
4Garage / Parking2,1601,915245
88.7%
5Wraparound Extension47842454
88.7%
6Dormer2,4152,138277
88.5%
7New Build1,2431,091152
87.8%
8Extension (General)930811119
87.2%
9Hip-to-Gable Conversion1,1661,013153
86.9%
10Side Extension1,9591,666293
85.0%
11Change of Use (Residential)1,164974190
83.7%
12Outbuilding1,043866177
83.0%
13Flat Conversion879730149
83.0%
14Rear Extension5,7804,7261,054
81.8%
15Annex1068422
79.2%
16Front Extension23418549
79.1%
17HMO1789979
55.6%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 92.6% approval rate. HMO? Just 55.6%.
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What the data tells us

1
The range is massive: 55.6% to 92.6%. Choosing the right project type — or framing your application correctly — can dramatically affect outcomes.
2
Visibility drives scrutiny. Project types that change the external appearance — dormers, loft conversions, hip-to-gable — face more resistance than those that don't. The more visible your proposal, the more carefully it needs designing.
3
These are council-wide averages. Your ward, your street and your immediate neighbours all shift the odds. The comparable decisions near your property are the best indicator of outcome.

Before you spend £5,000+ on architects and drawings

2,509 planning applications in Merton have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A free, property-specific report shows you what gets approved — and what gets refused — near your property.

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More Merton planning data

Nearby councils project type rankings

Methodology: Classifies 18,193 decisions in Merton into residential project types using keyword matching against proposal descriptions (matching generate_site_data.py subtype rules). A single application may appear in multiple categories. Data from Merton Council's public planning portal, January 2020 to August 2026. Full methodology →
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