Side Extension approval rate in Lambeth

Lambeth approved 85.0% of side extension applications, based on 2,218 decisions analysed.

Last updated: June 2026

85.0%

side extension approval rate

2,218

Side Extension decisions

1,886

Approved

332

Refused

84.5%

Lambeth overall

Side Extension applications are approved at roughly the same rate as the Lambeth average (84.5%).

How side extension compares in Lambeth

Side Extension (2,218 decided)

85.0%

Lambeth all applications (31,464 decided)

84.5%

Planning a side extension in Lambeth?

85.0% 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 side extension approval rate
✓ Nearest comparable side extension decisions
✓ Refusal triggers specific to your area
✓ PDF report for your architect

Free planning check for Lambeth →

Other project types in Lambeth

Rear Extension (6,119 decided)

82.3%

Garage / Parking (4,550 decided)

87.3%

Loft Conversion (3,562 decided)

78.0%

Basement (3,493 decided)

84.9%

Dormer (3,173 decided)

81.2%

Flat Conversion (2,900 decided)

89.3%

Change of Use (Residential) (2,590 decided)

79.3%

New Build (2,122 decided)

85.2%

Extension (General) (1,525 decided)

85.2%

Outbuilding (973 decided)

83.7%

Hip-to-Gable Conversion (467 decided)

76.7%

Wraparound Extension (387 decided)

83.2%

Conservatory (349 decided)

87.7%

HMO (264 decided)

65.5%

Front Extension (71 decided)

77.5%

Annex (63 decided)

76.2%

← All Lambeth planning statistics

Check planning approval patterns, Free