Data-backed planning intelligence · 2,500,000+ decisions analysed across England

Most Common Planning Applications in Windsor & Maidenhead

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Windsor & Maidenhead is 19.2% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

6,575 real decisions·15 project types·Updated March 2026
90.6%
Safest: Hip-to-Gable Conversion
71.4%
Lowest: Annex
19.2%
Spread
15
Types ranked

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All 15 project types ranked

#TypeDecisionsApprovedRefusedRate
1Hip-to-Gable Conversion11710611
90.6%
2Loft Conversion25322627
89.3%
3Basement918110
89.0%
4Conservatory18216022
87.9%
5Rear Extension1,9341,652282
85.4%
6Front Extension54145685
84.3%
7Extension (General)18815830
84.0%
8Side Extension1,2321,034198
83.9%
9Garage / Parking1,3721,128244
82.2%
10Dormer627510117
81.3%
11New Build13310825
81.2%
12Change of Use (Residential)25920851
80.3%
13Outbuilding46036694
79.6%
14Wraparound Extension1178928
76.1%
15Annex352510
71.4%
See how this applies to your postcode →

These are council averages. Your property is specific.

A hip-to-gable conversion application has a 90.6% approval rate. Annex? Just 71.4%.
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What the data tells us

1
The range is massive: 71.4% to 90.6%. 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

974 planning 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 project type rankings

Methodology: Classifies 6,575 decisions in Windsor & Maidenhead 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 Windsor & Maidenhead Council's public planning portal, January 2020 to present. Full methodology →
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