UB5: 24 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in UB5, UB5 6GT, stands 24 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, UB5 4GZ, stands 58 m above it.
- Ground at eight in ten of its postcodes: between 32 m and 53 m, measured from Ordnance Datum; the middle one stands at 38 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Ealing; partly in Hillingdon.