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Postcode Head-to-Head Comparison

Compare Damp & Mould Risk

Compare Damp Risk Scores, Victorian solid-wall housing percentages, and energy performance ratings between any two UK postcode districts.

Outcode B1 has a 40 POINT LOWER damp risk score than B21

B1 benefits from a lower concentration of uninsulated solid-wall masonry (6.4% vs 62.5%) and lower rain exposure (Moderate vs Severe), reducing thermal dew-point condensation.

Metric / Technical Indicator
B21 (Birmingham)
B1 (Birmingham)
Damp Risk Score
58/100
18/100
Severity Classification
High
Low
Solid Wall Masonry %
62.5%
6.4%
Pre-1930 Victorian Builds
69.3%
1.7%
Wind-Driven Rain (BS 8104)
Severe
Moderate
Dew Point (@ 20°C room temp)
12.4°C (84% RH)
10.3°C (82.6% RH)
Energy Inefficiency (EPC E-G)
29.8%
3.8%
Terraces & Flats
80.2%
63.8%
Dominant Architecture
Mid-Terrace
Mid-Terrace
Sample Inspected Homes
14,131
10,362

Housing Stock & Moisture Dynamics: B21 vs B1

When assessing property condition between B21 (Birmingham) and B1 (Birmingham), the primary structural differentiator is the age profile of the residential building envelope.

In B21, 69.3% of properties are solid-wall Victorian or Edwardian construction, compared to 1.7% in B1. Solid brick masonry lacks the modern thermal break of a cavity wall, resulting in higher moisture permeation through mortar beds during prolonged wet weather.

Regarding energy efficiency, B21 records 29.8% of properties in EPC bands E through G, while B1 records 3.8%. Colder internal surface temperatures accelerate the condensation of ambient indoor moisture, substantially elevating the risk of black mould spore germination.

Sample: 14,131 (B21) vs 10,362 (B1) homes
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