Basement approval rate in Hounslow

Hounslow approved 89.0% of basement applications, based on 1,485 decisions analysed.

Last updated: March 2026

89.0%

basement approval rate

1,485

Basement decisions

1,321

Approved

164

Refused

87.7%

Hounslow overall

Basement applications are approved at roughly the same rate as the Hounslow average (87.7%).

How basement compares in Hounslow

Basement (1,485 decided)

89.0%

Hounslow all applications (72,195 decided)

87.7%

Planning a basement in Hounslow?

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Less than one set of revised drawings.

Other project types in Hounslow

Rear Extension (26,504 decided)

84.9%

Loft Conversion (12,007 decided)

89.7%

Garage / Parking (8,713 decided)

88.6%

Side Extension (7,753 decided)

88.1%

New Build (4,779 decided)

90.0%

Outbuilding (4,154 decided)

80.6%

Hip-to-Gable Conversion (3,244 decided)

85.4%

Change of Use (Residential) (3,085 decided)

82.7%

Extension (General) (3,033 decided)

92.9%

Conservatory (1,925 decided)

95.0%

Wraparound Extension (1,494 decided)

88.9%

Flat Conversion (1,402 decided)

72.9%

Dormer (1,373 decided)

90.5%

Front Extension (1,034 decided)

83.0%

HMO (338 decided)

49.7%

Annex (110 decided)

66.4%

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