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Annex approval rate in Blackburn with Darwen

Blackburn with Darwen approved 89.8% of annex applications, based on 88 decisions analysed.

Last updated: October 2026

89.8%
annex approval rate
88
Annex decisions
79
Approved
9
Refused
87.7%
Blackburn with Darwen overall

This rate rests on 88 decisions, a small sample, so treat it with caution.

How annex applications compare in Blackburn with Darwen

Annex (88 decided)
89.8%
Blackburn with Darwen all applications (10,138 decided)
87.7%

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Other project types in Blackburn with Darwen

Rear extension (2,200 decided)
90.3%
Other extension (1,931 decided)
87.9%
Garage and parking (1,414 decided)
89.0%
Change of use (residential) (1,090 decided)
78.5%
Side extension (1,073 decided)
88.4%
Dormer (571 decided)
82.3%
New build (458 decided)
84.3%
Conservatory (314 decided)
92.7%
Outbuilding (287 decided)
88.9%
Wraparound extension (221 decided)
86.0%
Front extension (159 decided)
88.1%
Basement (103 decided)
87.4%
Flat conversion (102 decided)
71.6%
Hip-to-Gable conversion (72 decided)
91.7%
Loft conversion (64 decided)
84.4%
HMO (29 decided)
55.2%
← All Blackburn with Darwen planning statistics
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