homeduediligence

Flood risk in Birmingham, district by district

Across the 43 Birmingham postcode districts with a guide, 9 of the 396 postcodes we checked are in a mapped river or sea flood area (in B5, B11, B19 and B35).

Surface water flood risk, from heavy rain, is medium or high at 22 of the 396 postcodes we checked (in B1, B2, B5, B7, B9, B10, B11, B13, B16, B17, B18, B19, B23, B24, B26, B27, B28, B38, B44 and B73).

From Environment Agency, SEPA and Natural Resources Wales flood maps, checked at the sampled postcodes of each district guide in October 2026. Facts with their sources, not a rating: a district with nothing found isn't safe, and one with findings isn't unsafe. The maps describe the ground, not any home.

Check a postcode in Birmingham

Free, from the official flood maps for England, Scotland and Wales. No account needed.

District by district

Sampled: the centre of 7 to 9 postcodes in each district

DistrictRivers and seaSurface water (medium or high)
B1None of 12 postcodes1 of 12 postcodes
B2None of 12 postcodes1 of 12 postcodes
B3None of 12 postcodes0 of 12 postcodes
B4None of 12 postcodes0 of 12 postcodes
B53 of 12 postcodes (Flood Zone 3)1 of 12 postcodes
B6None of 12 postcodes0 of 12 postcodes
B7None of 8 postcodes1 of 8 postcodes
B8None of 12 postcodes0 of 12 postcodes
B9None of 8 postcodes1 of 8 postcodes
B10None of 12 postcodes1 of 12 postcodes
B111 of 8 postcodes (Flood Zone 3)1 of 8 postcodes
B12None of 12 postcodes0 of 12 postcodes
B13None of 8 postcodes1 of 8 postcodes
B14None of 8 postcodes0 of 8 postcodes
B15None of 12 postcodes0 of 12 postcodes
B16None of 12 postcodes1 of 12 postcodes
B17None of 8 postcodes3 of 8 postcodes
B18None of 8 postcodes1 of 8 postcodes
B191 of 12 postcodes (Flood Zone 2)1 of 12 postcodes
B20None of 8 postcodes0 of 8 postcodes
B21None of 8 postcodes0 of 8 postcodes
B23None of 8 postcodes1 of 8 postcodes
B24None of 8 postcodes1 of 8 postcodes
B25None of 8 postcodes0 of 8 postcodes
B26None of 8 postcodes1 of 8 postcodes
B27None of 8 postcodes1 of 8 postcodes
B28None of 8 postcodes1 of 8 postcodes
B29None of 8 postcodes0 of 8 postcodes
B30None of 8 postcodes0 of 8 postcodes
B31None of 8 postcodes0 of 8 postcodes
B32None of 8 postcodes0 of 8 postcodes
B33None of 8 postcodes0 of 8 postcodes
B34None of 8 postcodes0 of 8 postcodes
B354 of 8 postcodes (Flood Zone 2, Flood Zone 3)0 of 8 postcodes
B38None of 8 postcodes1 of 8 postcodes
B42None of 8 postcodes0 of 8 postcodes
B44None of 8 postcodes1 of 8 postcodes
B45None of 8 postcodes0 of 8 postcodes
B72None of 12 postcodes0 of 12 postcodes
B73None of 8 postcodes1 of 8 postcodes
B74None of 8 postcodes0 of 8 postcodes
B75None of 8 postcodes0 of 8 postcodes
B76None of 8 postcodes0 of 8 postcodes

Each district guide checks 7 to 9 postcodes spread across the district. "2 of 8 postcodes" means the finding was at two of those centres, not at a quarter of homes. Open a district for its own guide, with every postcode listed.

What it means when you buy in Birmingham

Look the postcode up on the official flood map for its country. In England, the flood zone is the chance of flooding from rivers or the sea in any year, ignoring flood defences:

  • Flood Zone 1: less than 1 in 1,000.
  • Flood Zone 2: between 1 in 1,000 and 1 in 100 from rivers, or 1 in 200 from the sea.
  • Flood Zone 3: 1 in 100 or more from rivers, or 1 in 200 or more from the sea.
  • Surface water from heavy rain is mapped separately and affects many homes away from rivers and the sea. Scotland and Wales use their own maps and bands.
  • Whether the area has flooded before: in England, the Environment Agency records the outlines of past floods.

Flood risk can affect what insurance costs, whether a lender is comfortable, and what the home is worth when you come to sell. Finding out before you offer means you can ask questions while you can still walk away cheaply.

Flood maps are models, not promises. A low-risk area can still flood, and a higher-risk one may have defences. The maps tell you where to ask more questions.

Use the postcode check to decide whether to look closer, then check the house before you offer.

How to check flood risk for a particular home →

Questions to ask about a home in Birmingham

  • Has the house, the garden or the access road flooded while the seller has owned it?
  • Has a flood insurance claim ever been made, and what does buildings insurance cost now, with flood cover?
  • Does the home have flood protection, such as flood doors or air-brick covers, and who maintains it?
  • What does the environmental search say, and does it agree with the maps?

The full report checks the house itself, not the postcode, and ties each question to what it found. See an example report.

Flood risk in Birmingham by postcode district · HomeDueDiligence