Annex approval rate in Hounslow

Hounslow approved 68.2% of annex applications, based on 110 decisions analysed.

Last updated: June 2026

68.2%

annex approval rate

110

Annex decisions

Approved

Refused

87.6%

Hounslow overall

Annex applications are refused more often than the Hounslow average (87.6%), suggesting the council scrutinises these projects more closely.

How annex compares in Hounslow

Annex (110 decided)

68.2%

Hounslow all applications (72,995 decided)

87.6%

Planning a annex in Hounslow?

68.2% 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 annex approval rate
✓ Nearest comparable annex decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect

Free planning check for Hounslow →

Other project types in Hounslow

Rear Extension (26,741 decided)

84.9%

Loft Conversion (12,095 decided)

89.7%

Garage / Parking (8,803 decided)

88.4%

Side Extension (7,834 decided)

88.0%

New Build (4,819 decided)

89.9%

Outbuilding (4,193 decided)

80.6%

Hip-to-Gable Conversion (3,271 decided)

85.3%

Change of Use (Residential) (3,114 decided)

82.5%

Extension (General) (3,050 decided)

92.8%

Conservatory (1,942 decided)

94.6%

Wraparound Extension (1,509 decided)

89.0%

Basement (1,499 decided)

89.1%

Flat Conversion (1,423 decided)

72.9%

Dormer (1,416 decided)

90.0%

Front Extension (1,047 decided)

82.8%

HMO (358 decided)

48.3%

← All Hounslow planning statistics

Check planning approval patterns, Free