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Loft Conversion Approval Rates in Windsor & Maidenhead

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 Windsor & Maidenhead.

301 real decisions·January 2020 to September 2026·Updated September 2026
87.4%
Approval Rate
301
Decisions
263
Approved
38
Refused
87.4% approved. But 38 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.

These are council averages. Your property is specific.

Two houses on the same street can get different outcomes.
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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 Windsor & Maidenhead.

TypeDecisionsRate
Basement107
87.9%
Loft Conversion301
87.4%
Conservatory206
87.4%
Front Extension655
84.7%
Rear Extension2,322
84.4%
Hip-to-Gable Conversion152
83.6%
Side Extension1,490
83.5%
Extension (General)223
83.4%
Garage / Parking1,702
82.2%
Dormer776
79.1%
Outbuilding622
78.5%
Change of Use (Residential)323
78.3%
New Build156
78.2%
Wraparound Extension125
76.8%
Annex50
64.0%
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What the data tells us

1
87.4% of loft conversion applications in Windsor & Maidenhead get approved. That means 38 homeowners since 2020 have been refused. Not terrible odds, but not a foregone conclusion.
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

38 loft conversion applications in Windsor & Maidenhead 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 Windsor & Maidenhead planning data

Nearby councils loft conversion data

Methodology: Based on 301 planning decisions classified as loft conversions in Windsor & Maidenhead, January 2020 to September 2026. 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 Windsor & Maidenhead Council's public planning portal. Full methodology →
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