Annex approval rate in Birmingham

Birmingham approved 69.2% of annex applications, based on 91 decisions analysed.

Last updated: March 2026

69.2%

annex approval rate

Annex decisions

Approved

Refused

83.8%

Birmingham overall

Annex applications are refused more often than the Birmingham average (83.8%), suggesting the council scrutinises these projects more closely.

How annex compares in Birmingham

Annex (91 decided)

69.2%

Birmingham all applications (33,111 decided)

83.8%

Planning a annex in Birmingham?

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Less than one set of revised drawings.

Other project types in Birmingham

Rear Extension (13,248 decided)

87.2%

Side Extension (5,640 decided)

87.1%

New Build (3,721 decided)

83.2%

Dormer (2,363 decided)

76.1%

Change of Use (Residential) (1,863 decided)

55.1%

Wraparound Extension (1,842 decided)

87.8%

Garage / Parking (1,578 decided)

79.7%

Front Extension (1,556 decided)

85.3%

HMO (1,002 decided)

60.0%

Loft Conversion (791 decided)

74.1%

Outbuilding (757 decided)

86.0%

Extension (General) (650 decided)

80.8%

Hip-to-Gable Conversion (330 decided)

63.6%

Flat Conversion (297 decided)

52.2%

Conservatory (166 decided)

88.0%

Basement (127 decided)

79.5%

← All Birmingham planning statistics

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