Data-backed planning intelligence · 3,290,000+ decisions analysed across England

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.

1,158 real decisions·January 2020 to present·Updated June 2026
87.5%
Approval Rate
1,158
Decisions
1,013
Approved
145
Refused
87.5% approved. But 145 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.

Check Planning Approval Patterns in Slough

See your ward's approval rate and nearby planning decisions — free and instant.

Check My Postcode

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.
Check your postcode to see what actually happens near your address.

Check My Postcode

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
Loft Conversion1,158
87.5%
Conservatory177
85.9%
Wraparound Extension920
85.7%
Dormer869
85.7%
Garage / Parking1,264
84.0%
Rear Extension7,156
83.7%
Hip-to-Gable Conversion358
83.2%
Side Extension2,806
82.5%
Outbuilding1,251
82.3%
Extension (General)328
81.4%
Annex28
78.6%
Change of Use (Residential)768
78.4%
Flat Conversion23
78.3%
Front Extension660
74.4%
New Build245
71.4%
HMO57
47.4%
See how this applies to your postcode →

What the data tells us

1
87.5% of loft conversion applications in Slough get approved. That means 145 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

145 loft conversion applications in Slough 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.

Check my postcode
Free · Property report emailed in minutes · Based on 3,290,000+ real decisions

More Slough planning data

Nearby councils loft conversion data

Methodology: Based on 1,158 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 →
Check planning approval patterns in Slough — Free