Side Extension approval rate in Lambeth

Lambeth approved 84.9% of side extension applications, based on 2,175 decisions analysed.

Last updated: March 2026

84.9%

side extension approval rate

2,175

Side Extension decisions

1,847

Approved

328

Refused

84.6%

Lambeth overall

Side Extension applications are approved at roughly the same rate as the Lambeth average (84.6%).

How side extension compares in Lambeth

Side Extension (2,175 decided)

84.9%

Lambeth all applications (30,422 decided)

84.6%

Planning a side extension in Lambeth?

84.9% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.

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

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Less than one set of revised drawings.

Other project types in Lambeth

Rear Extension (5,992 decided)

82.2%

Garage / Parking (4,482 decided)

87.4%

Loft Conversion (3,494 decided)

78.2%

Basement (3,456 decided)

85.0%

Dormer (3,133 decided)

81.4%

Flat Conversion (2,891 decided)

89.5%

Change of Use (Residential) (2,548 decided)

79.0%

New Build (2,101 decided)

85.6%

Extension (General) (1,481 decided)

85.1%

Outbuilding (939 decided)

83.3%

Hip-to-Gable Conversion (461 decided)

76.8%

Wraparound Extension (381 decided)

82.7%

Conservatory (343 decided)

87.2%

HMO (256 decided)

66.4%

Front Extension (71 decided)

77.5%

Annex (61 decided)

75.4%

← All Lambeth planning statistics

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