Data-backed planning intelligence · 2,500,000+ decisions analysed across England, Scotland and Wales

Basement approval rate in Portsmouth

Portsmouth approved 87.4% of basement applications, based on 87 decisions analysed.

Last updated: March 2026

87.4%
basement approval rate
87
Basement decisions
76
Approved
11
Refused
88.5%
Portsmouth overall

Basement applications are approved at roughly the same rate as the Portsmouth average (88.5%).

How basement compares in Portsmouth

Basement (87 decided)
87.4%
Portsmouth all applications (9,214 decided)
88.5%

Planning a basement in Portsmouth?

87.4% get approved — but the odds vary by street. Your Pro Report shows exactly what gets approved and refused near your property.

✓ Your ward's basement approval rate
✓ Nearest comparable basement decisions
✓ Refusal triggers specific to your area
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Less than one set of revised drawings.

Other project types in Portsmouth

Rear Extension (2,254 decided)
89.2%
84.7%
HMO (1,003 decided)
85.5%
Dormer (756 decided)
78.7%
Garage / Parking (657 decided)
84.6%
Side Extension (571 decided)
87.0%
Extension (General) (313 decided)
85.9%
Outbuilding (230 decided)
92.2%
Conservatory (219 decided)
93.2%
Loft Conversion (200 decided)
75.0%
Flat Conversion (147 decided)
68.7%
Front Extension (109 decided)
85.3%
79.2%
91.3%
Annex (36 decided)
75.0%
New Build (27 decided)
70.4%
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