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Loft Conversion Approval Rates in Wandsworth

Loft conversions change your roofline — and that makes them one of the more closely scrutinised application types. Councils scrutinise visibility, overlooking and street character more closely than for ground-level work. Here's what the data shows in Wandsworth.

4,450 real decisions·January 2020 to present·Updated June 2026
91.3%
Approval Rate
4,450
Decisions
4,063
Approved
387
Refused
91.3% approved. But 387 refused since 2020. Each refusal cost the homeowner time and money on drawings and application fees. Understanding your local data before you apply is the difference between confidence and a costly gamble.

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Why loft conversion approval rates matter

Loft conversions face more scrutiny than rear or side extensions because they change the property's profile from the street. Dormers, mansards and hip-to-gable alterations are particularly sensitive.

Ward gap in Wandsworth: Wandsworth Common approves 80.0% of loft conversion applications while Balham sits at 57.1%. That 22.9% gap means your postcode is one of the strongest indicators of outcome.

Loft Conversion approval rate by ward

#WardDecisionsApprovedRate
1Wandsworth Common54
80.0%
2Wandsworth Town53
60.0%
3Balham74
57.1%
See how this applies to your postcode →

These are council averages. Your property is specific.

A loft conversion has a 80.0% approval rate in Wandsworth Common but just 57.1% in Balham.
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How loft conversions compare to other project types

Not all applications are treated equally. Here's how loft conversions stack up against other common projects in Wandsworth.

TypeDecisionsRate
Conservatory108
96.3%
Flat Conversion732
96.2%
Garage / Parking3,411
95.5%
Basement3,218
94.7%
New Build1,727
94.1%
Side Extension3,443
93.6%
Rear Extension6,238
92.9%
Change of Use (Residential)2,001
92.9%
Extension (General)1,644
92.6%
Wraparound Extension285
92.6%
Outbuilding817
91.7%
Loft Conversion4,450
91.3%
Annex60
90.0%
HMO211
89.1%
Dormer1,954
88.7%
Front Extension115
87.0%
Hip-to-Gable Conversion297
83.2%
See how this applies to your postcode →

What the data tells us

1
91.3% of loft conversion applications in Wandsworth get approved. That means 387 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
2
Your ward matters more than you think. The 22.9% gap between Wandsworth Common (80.0%) and Balham (57.1%) means your postcode is one of the strongest indicators of outcome.
3
Council averages are starting points, not guarantees. The decisions that matter most are the comparable ones near your specific property — because planning officers look at precedent, character and the immediate context of your street.

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

387 loft conversion applications in Wandsworth 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 Wandsworth planning data

Nearby councils loft conversion data

Methodology: Based on 4,450 planning decisions classified as loft conversions in Wandsworth, January 2020 to present. Classification uses keyword matching against proposal descriptions (matching generate_site_data.py rules). A single application may appear in multiple categories. Approval rate = approved / (approved + refused). Pending, withdrawn and invalid applications excluded. Data from Wandsworth Council's public planning portal. Full methodology →
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