BeforeIBuyHonest. Maybe too honest.
№ 04 / 09 · Flood risk

Is Mabe Burnthouse at risk of flooding?

For anyone buying or renting in Mabe Burnthouse.

Barely, and that is the honest answer rather than a soothing one. Nothing in the village sits in a river or sea flood zone. Nothing is recorded as having flooded. A small number of postcodes pick up a high rating on the broader indicators, which is surface water doing the talking. Granite, height and distance from anything tidal have done most of the work here.

On rivers and the sea, the Environment Agency's mapping puts 0% of the area's postcodes in flood zone 3 and 0% in flood zone 2. Those two are separate bands rather than nested ones, with zone 2 covering the additional medium-probability fringe beyond zone 3, so both being empty means the whole mapped river-and-sea risk simply does not reach here. There is no watercourse threat carried in the national mapping for this village.

Surface water is the one that matters instead, and it is the one that catches people out because it does not need a river. Rain arriving faster than granite and drains can move it will pool wherever the ground says so, and that is a lane-by-lane question rather than a village-wide one. The elevated postcode ratings in this area cannot be coming from rivers or the sea, because none of the area sits in those zones.

Looking forward, the climate-adjusted flood zone share is also 0%, meaning the allowance for higher future river and sea levels does not pull any part of the village into the mapped zones.

For insurance, that is about as clean a position as a Cornish address gets. Flood questions on a quote should be straightforward, and there is no obvious reason for a loading on the standard risk. That does not make the specific property irrelevant: a house at the bottom of a dip with a drive that slopes towards the front door will be treated on its own merits, whatever the postcode-level picture says.

Taking all the indicators together, including surface water alongside rivers and sea, about 4% of the area's postcodes rate high on at least one measure, about 4% rate medium and about 28% rate low. These bands overlap with the zone figures rather than adding to them, and they describe postcodes rather than individual homes. At address level the high rating touches one address.

On whether anything stands between the water and the house, the modelled flood extents record 0% of postcodes in a high-risk extent with defences present and 0% in a high-risk extent without them. Nothing is defended here because nothing needs defending, which is a different and better situation than being protected by a wall someone has to maintain.

The area falls under a shoreline management plan, as the whole coast does. The stated policy is to hold the line over the next twenty years, moving to managed realignment over the fifty and hundred year horizons. A policy is a statement of intent about future coastal management, not a defence that exists today, and the nearest coast is some distance from the village anyway. The nearest long-record tide gauge, at Devonport, measured sea level rising at about 2.35 millimetres a year across its 1962 to 2015 record. That is a measured historic rate, not a projection.

No historic flooding is recorded across the area. Absence of a record is genuinely reassuring and is not the same as proof that nothing has ever come up a lane after a summer downpour.

Flooding is one of the quieter worries on this page. The mapped risk is close to nil, the one thing worth checking is how your particular plot handles heavy rain, and the survey will tell you more than any national map can.

Check it for your address. Flood risk can change from one street to the next, so look up the exact address on the government's long term flood risk service.

Sources: Environment Agency · Environment Agency tide gauges (via PSMSL)

Data to April 2026 · Figures checked 20 September 2026 (what this means)