Flat Conversion approval rate in Hillingdon

Hillingdon approved 73.0% of flat conversion applications, based on 914 decisions analysed.

Last updated: March 2026

73.0%

flat conversion approval rate

914

Flat Conversion decisions

667

Approved

247

Refused

78.9%

Hillingdon overall

Flat Conversion applications are refused more often than the Hillingdon average (78.9%), suggesting the council scrutinises these projects more closely.

How flat conversion compares in Hillingdon

Flat Conversion (914 decided)

73.0%

Hillingdon all applications (30,009 decided)

78.9%

Planning a flat conversion in Hillingdon?

73.0% get approved — but the odds vary by street. Your Pro Report 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

Get Hillingdon Pro Report — £79

Less than one set of revised drawings.