Extension (General) approval rate in Hillingdon

Hillingdon approved 83.0% of extension (general) applications, based on 1,957 decisions analysed.

Last updated: March 2026

83.0%

extension (general) approval rate

1,957

Extension (General) decisions

1,624

Approved

333

Refused

78.9%

Hillingdon overall

Extension (General) applications are approved more often than the Hillingdon average (78.9%), suggesting the council is relatively receptive to these projects.

How extension (general) compares in Hillingdon

Extension (General) (1,957 decided)

83.0%

Hillingdon all applications (30,009 decided)

78.9%

Planning a extension (general) in Hillingdon?

83.0% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.

✓ Your ward's extension (general) approval rate
✓ Nearest comparable extension (general) decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect

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Less than one set of revised drawings.