How It Works
Check your postcode in three steps.
- 1
Enter Postcode
Type a valid UK postcode.
- 2
Analyse Data
We look up the postcode location and check which public datasets cover it.
- 3
See Results
Explore a postcode profile, map and the available information.
How we assess an area
We check the postcode point against river and sea planning zones in England and look for active flood notices in nearby areas. Weather warnings cover a region, or the UK when a region is unavailable. Each finding shows the available evidence and its coverage. The site grade uses the highest trigger in the table below. It covers these three checks and is intended for initial screening.
- A
- All three checks are usable and none has an elevated signal.
- B
- Flood Zone 2 or a nearby flood alert.
- C
- Yellow warning in the regional weather feed.
- D
- Flood Zone 3.
- E
- Amber warning in the regional weather feed.
- F
- Nearby flood warning.
- G
- Nearby severe flood warning or red warning in the regional weather feed.
If any of the three required checks is missing or outside coverage, the result shows Not Rated. Available warnings still appear individually. National weather feeds remain visible in the results and are excluded from the grade. Use the original warnings to check the affected area and times.
River and sea planning zones
What it measures · The planning map classifies the representative postcode point by mapped exposure to river and sea flooding.
Why it matters · Use the zone to identify whether more detailed planning checks are needed.
Screening rule · Zone 2 contributes B, Zone 3 contributes D, and a point outside both zones contributes no elevated signal.
Coverage · England. This layer excludes flood defences and surface-water risk.
Source · Environment Agency
Nearby live flood alerts
What it measures · The Environment Agency feed lists alerts and warnings for flood areas near the postcode point.
Why it matters · Check the official warning for its affected area and recommended action.
Screening rule · A nearby alert contributes B, a warning F, and a severe warning G.
Coverage · England, using a 10 km search. A nearby warning may apply to a different location.
Source · Environment Agency live flood alerts
Weather warnings
What it measures · The Met Office warning feed describes severe weather expected in its coverage area.
Why it matters · The original warning lists the affected places and times.
Screening rule · Regional yellow, amber and red warnings contribute C, E and G respectively.
Coverage · Regional where supported. A UK-wide fallback is displayed separately from the screening grade.
Source · Met Office
See the risk categories and source coverage for details.
Compare findings for two postcodes or explore the map layers.