BB1 1BA - Flood, Heat, Air & Subsidence Risk - Cob Wall (BB1)

Blackburn with Darwen, Cob Wall (BB1)

Climate risk summary for BB1 1BA

BB1 1BA in Cob Wall (BB1) has a Low flood risk - EA NaFRA2 data records 1 property in a flood risk zone. Heat risk is Lower, with a median (50th percentile) of 11 days above 25°C per year, averaged over the 2021-2040 period under the RCP8.5 high emissions scenario (Met Office UKCP18). Air quality is Medium at PM2.5 6.3 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Glacial Till geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: EA NaFRA2: 1 low flood risk properties in this postcode.
• Heat: Projected 11 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5, 12 km grid - postcodes within the same grid cell share this value).
• Air quality: PM2.5 6.3 µg/m³ - above the WHO annual guideline of 5 µg/m³ (Defra UK-AIR PCM model, council-level average - every postcode in this council shows this value).
• Ground: BGS data: Glacial Till geology. Shrink-swell risk classed as improbable (British Geological Survey).
• Green space: 100% of households here have accessible green space within a 15-minute walk (the government's Environmental Improvement Plan standard), and less than 1% have a park or green space within a 200m walk of their door - below the England median (Defra, 2025).

What is the flood risk in BB1 1BA?

Flood risk at BB1 1BA is rated Low, based on Environment Agency NaFRA2 modelling.

Environment Agency flood zone data shows low flood risk for BB1 1BA in Cob Wall (BB1). EA NaFRA2 data shows 1 at low risk in this postcode. The band reflects the highest flood risk within the postcode; some properties within this postcode may face little or no direct flood risk. For a specific property, a conveyancing search will confirm the exact flood zone position.

How is the air quality in BB1 1BA?

Air quality at BB1 1BA is rated Medium, based on Defra UK-AIR annual mean PM2.5 data. Fine particulate matter (PM2.5) comes primarily from road traffic, industry, and domestic burning. Long-term exposure above the WHO guideline of 5 µg/m³ is linked to respiratory and cardiovascular health risks. Buyers and renters in higher air quality risk areas may wish to consider whether the property is near busy roads or industrial sources.

Is subsidence a risk at BB1 1BA?

British Geological Survey data classes the underlying soil at BB1 1BA as Glacial Till, with shrink-swell hazard rated improbable (subsidence risk band: Low). A structural survey is the reliable way to assess ground conditions for a specific property.

Where does this data come from?

This LocalRisk report for BB1 1BA draws on four official UK open data sources: Environment Agency NaFRA2 flood modelling, Met Office UKCP18 climate projections, Defra UK-AIR PM2.5 monitoring, and British Geological Survey GeoClimate subsidence mapping. Risk ratings are a screening tool, complementing - not replacing - the searches and surveys ordered as part of a property transaction. Data covers Blackburn with Darwen and is updated as new official datasets are published.

About the Blackburn with Darwen area

Blackburn with Darwen has an inland setting of valleys and rising ground and experiences cool, wet winters and warm summers, shaped by upland surroundings and urban development.

What should buyers and renters check in BB1 1BA?

Practical check: EA flags just 1 property at flood risk here - check whether this one is among them via a formal flood search. These are postcode-level indicators - conditions vary between individual properties.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for BB1 1AE is at localrisk.co.uk/postcode/BB11AE, and you can compare BB1 1BA side by side with any UK postcode at localrisk.co.uk/compare.