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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.

274 real decisions·January 2020 to present·Updated June 2026
89.1%
Approval Rate
274
Decisions
244
Approved
30
Refused
89.1% approved. But 30 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
Loft Conversion274
89.1%
Hip-to-Gable Conversion135
88.1%
Basement97
87.6%
Conservatory192
87.0%
Front Extension598
84.6%
Rear Extension2,140
84.4%
Side Extension1,372
83.5%
Extension (General)211
83.4%
Garage / Parking1,537
82.3%
New Build146
80.8%
Dormer705
80.4%
Outbuilding557
78.6%
Change of Use (Residential)301
78.1%
Wraparound Extension121
76.0%
Annex43
62.8%
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What the data tells us

1
89.1% of loft conversion applications in Windsor & Maidenhead get approved. That means 30 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

30 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 274 planning decisions classified as loft conversions in Windsor & Maidenhead, 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 Windsor & Maidenhead Council's public planning portal. Full methodology →
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