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Loft Conversion Approval Rates in Slough

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 Slough.

590 real decisions·January 2020 to present·Updated March 2026
86.9%
Approval Rate
590
Decisions
513
Approved
77
Refused
86.9% approved. But 77 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 Slough.

TypeDecisionsRate
Conservatory46
91.3%
Wraparound Extension392
87.5%
Loft Conversion590
86.9%
Side Extension1,026
86.4%
Outbuilding590
85.3%
Dormer395
84.3%
Rear Extension2,671
84.3%
Garage / Parking503
82.9%
Front Extension326
82.2%
Hip-to-Gable Conversion214
82.2%
Extension (General)122
75.4%
New Build36
69.4%
Change of Use (Residential)286
66.8%
HMO34
44.1%
See how this applies to your postcode →

What the data tells us

1
86.9% of loft conversion applications in Slough get approved. That means 77 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

77 loft conversion applications in Slough 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 Slough planning data

Nearby councils loft conversion data

Methodology: Based on 590 planning decisions classified as loft conversions in Slough, 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 Slough Council's public planning portal. Full methodology →
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