Surveyors · Downderry, Cornwall
Buying in Downderry? Here's what the public data says about its homes, and which RICS survey suits them.
Our suggestion for Downderry
Choose by age in Downderry: a Level 2 for post-war homes, a Level 3 for period ones. Pick Level 3 for anything pre-1919, listed or much altered; a Level 2 covers a standard post-war or modern house in fair condition.
The median Downderry sale in 2025 was £350,000, across 15 sales (down 18% on 2024's £428,750).
| Type | Median |
|---|---|
| semi-detached | £350,000 |
| flat/maisonette | £160,000 |
Sales mix: flat/maisonette 40%, semi-detached 33%, detached 27%. PL11. HM Land Registry, 2025, ONS built-up area. Residents: Downderry built-up area, ONS Census 2021.
26% of the housing stock in these neighbourhoods dates from before 1919 and 26% from before 1900. Expect solid walls rather than cavities, so damp diagnosis needs care: cement renders, plastic paints and raised ground levels trap moisture in walls that were designed to breathe.
Source: VOA, Mar 2025
Historic England lists 1 building in and around Downderry. Listed status affects windows, renders and repairs, so check what consent exists for work already done.
Source: Historic England
Only 0 of the 9 postcodes we checked have their centre in Flood Zone 2 or 3. That's rivers and sea only; surface water is mapped separately, so still check the address.
Source: Environment Agency
The 1 km radon map square at the centre of Downderry is class 5: an estimated 10 to 30% of homes are above the radon Action Level. 100% of the sold postcodes we checked fall in a radon Affected Area. A three-month radon test is cheap, and fixes (often a sump or better underfloor ventilation) are well understood.
Source: UKHSA/BGS
Two Cornish checks to expect: a mining search from your conveyancer, and, for concrete-block houses from before about 1950, a mundic screening test.
Source: UNESCO WHS; RICS
Under most of Downderry the bedrock is mudstone, siltstone and sandstone (100%). This is the 'killas' country of slate and shale; older homes are often rubble stone, sometimes slate-hung, and weathering of soft stone and mortar is common.
Source: BGS 625k
The BGS GeoSure 5 km hexagon covering Downderry shows moderate slope instability (landslides) potential. That's a broad screen, not a site assessment; look for cracking, sticking doors and leaning walls.
Source: BGS GeoSure
At roughly 0.7 km from the open sea, exposure matters: check render, chimneys, window seals and metalwork for salt and weather damage.
Source: Natural Earth
Leasehold made up 40% of Downderry sales in 2025. Ask about years left on the lease, service charges and the sinking fund.
Source: HM Land Registry
Downderry LSOAs with 2025 sales. VOA, Mar 2025.
Selling a home in Downderry? Last year's medians ran: semi-detached £350,000, flat/maisonette £160,000. Your house isn't an average, so we come and look: the appraisal is free.
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Based on HM Land Registry Price Paid Data, 15 homes sold in Downderry in 2025 with a median price of £350,000 (down 18% on 2024's £428,750). The most common type sold was flat/maisonette (40% of sales).
We carry out RICS Level 2 and Level 3 surveys. Which you need depends on the age and type of the house. 26% of homes in the 1 neighbourhoods where Downderry homes sold were built before 1919. 1 listed building in and around Downderry. Tell us the age and type of the house and we'll confirm.
Yes, mostly: 100% of the 9 sold postcodes we checked are in an Affected Area, and the central 1 km square is class 5 (10 to 30% of homes above the Action Level).
It depends on the street: 0 of 9 sampled postcodes fall in Flood Zone 2 or 3 (0 in Zone 3). Check the exact address for surface water too.
Usually, yes. Mining searches are standard for Cornish purchases. Your conveyancer orders it; a mundic test is a separate check on pre-1950 concrete.
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