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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.

253 real decisions·January 2020 to present·Updated March 2026
89.3%
Approval Rate
253
Decisions
226
Approved
27
Refused
89.3% approved. But 27 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
Hip-to-Gable Conversion117
90.6%
Loft Conversion253
89.3%
Basement91
89.0%
Conservatory182
87.9%
Rear Extension1,934
85.4%
Front Extension541
84.3%
Extension (General)188
84.0%
Side Extension1,232
83.9%
Garage / Parking1,372
82.2%
Dormer627
81.3%
New Build133
81.2%
Change of Use (Residential)259
80.3%
Outbuilding460
79.6%
Wraparound Extension117
76.1%
Annex35
71.4%
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What the data tells us

1
89.3% of loft conversion applications in Windsor & Maidenhead get approved. That means 27 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

27 loft conversion applications in Windsor & Maidenhead have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A £79 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 253 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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