Surveyors · Carnon Downs, Cornwall
Surveys for Carnon Downs buyers, with Carnon Downs's own numbers: house prices, building age, flood zones and radon.
Our suggestion for Carnon Downs
Choose by age in Carnon Downs: a Level 2 for post-war homes, a Level 3 for period ones. If the house is Victorian or older, listed, or has been heavily extended, go Level 3. Otherwise a Level 2 normally does the job.
The median Carnon Downs sale in 2025 was £425,000, across 31 sales (down 1% on 2024's £430,000).
| Type | Median |
|---|---|
| detached | £440,000 |
| semi-detached | £325,000 |
Sales mix: detached 81%, semi-detached 16%, terraced 3%. TR3. HM Land Registry, 2025, ONS built-up area. Residents: Carnon Downs and Devoran built-up area, ONS Census 2021.
28% of the housing stock in these neighbourhoods dates from before 1919 and 27% 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 Carnon Downs. Listed status affects windows, renders and repairs, so check what consent exists for work already done.
Source: Historic England
0 of 18 postcodes checked are in Flood Zone 2 or 3, so most of Carnon Downs sits outside the river and sea flood zones. Low-lying streets and surface water can still catch people out.
Source: Environment Agency
The 1 km radon map square at the centre of Carnon Downs is class 6: an estimated 30% or more of homes are above the radon Action Level. 100% of the sold postcodes we checked fall in a radon Affected Area. Radon is a known issue in much of the South West; ask whether the home has been tested or has protection.
Source: UKHSA/BGS
Cornwall's metal-mining history means conveyancers usually order a mining search, and concrete-block homes built before about 1950 may need a mundic test for a mortgage.
Source: UNESCO WHS; RICS
Under most of Carnon Downs 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 Carnon Downs 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
Carnon Downs LSOAs with 2025 sales. VOA, Mar 2025.
Thinking of selling in Carnon Downs? 2025 medians by type: detached £440,000, semi-detached £325,000. Every home is different, which is why our market appraisal is in person, and free.
Need an EPC in Carnon Downs? EPCs in Carnon Downs. Request a quote for your sale or let.
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Based on HM Land Registry Price Paid Data, 31 homes sold in Carnon Downs in 2025 with a median price of £425,000 (down 1% on 2024's £430,000). The most common type sold was detached (81% of sales).
We carry out RICS Level 2 and Level 3 surveys. Which you need depends on the age and type of the house. 28% of homes in the 2 neighbourhoods where Carnon Downs homes sold were built before 1919. 1 listed building in and around Carnon Downs. The house itself decides it, so use the chooser or ask us.
Yes, mostly: 100% of the 18 sold postcodes we checked are in an Affected Area, and the central 1 km square is class 6 (30% or more of homes above the Action Level).
0 out of 18 checked Carnon Downs postcodes sit in Flood Zone 2 or 3, 0 of them in Zone 3. That's river and sea flooding; surface water is separate.
Yes in practice: lenders expect one across Cornwall. The conveyancer arranges it.
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