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Most Common Planning Applications in Brentwood

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Brentwood is 20.5% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

11,640 real decisions·16 project types·Updated March 2026
86.3%
Safest: Conservatory
65.8%
Lowest: Flat Conversion
20.5%
Spread
16
Types ranked

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All 16 project types ranked

#TypeDecisionsApprovedRefusedRate
1Conservatory739638101
86.3%
2Rear Extension3,7473,150597
84.1%
3Extension (General)42235468
83.9%
4Front Extension944787157
83.4%
5Garage / Parking3,1202,600520
83.3%
6Side Extension2,1711,785386
82.2%
7Annex18815434
81.9%
8Basement16113130
81.4%
9Outbuilding716578138
80.7%
10Wraparound Extension39331380
79.6%
11Hip-to-Gable Conversion25520154
78.8%
12Change of Use (Residential)37328885
77.2%
13New Build32224676
76.4%
14Dormer1,3901,026364
73.8%
15Loft Conversion534383151
71.7%
16Flat Conversion382513
65.8%
See how this applies to your postcode →

These are council averages. Your property is specific.

A conservatory application has a 86.3% approval rate. Flat Conversion? Just 65.8%.
Check your postcode to see what actually happens near your address.

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What the data tells us

1
The range is massive: 65.8% to 86.3%. 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

1,886 planning applications in Brentwood 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 Brentwood planning data

Nearby councils project type rankings

Methodology: Classifies 11,640 decisions in Brentwood 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 Brentwood Council's public planning portal, January 2020 to present. Full methodology →
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