Flat Conversion approval rate in Hillingdon

Hillingdon approved 73.1% of flat conversion applications, based on 917 decisions analysed.

Last updated: June 2026

73.1%

flat conversion approval rate

917

Flat Conversion decisions

670

Approved

247

Refused

79.0%

Hillingdon overall

Flat Conversion applications are refused more often than the Hillingdon average (79.0%), suggesting the council scrutinises these projects more closely.

How flat conversion compares in Hillingdon

Flat Conversion (917 decided)

73.1%

Hillingdon all applications (30,584 decided)

79.0%

Planning a flat conversion in Hillingdon?

73.1% get approved, but the odds vary by street. Your Full Planning Analysis shows exactly what gets approved and refused near your property.

✓ Your ward's flat conversion approval rate
✓ Nearest comparable flat conversion decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect

Free planning check for Hillingdon →