Radon in Manchester, district by district
At 16 of the 184 postcodes we checked across the 17 Manchester postcode districts with a guide, parts of the surrounding 1 km square are a radon Affected Area (in M4, M12, M13 and M40).
The highest band found is up to 5–10% of homes above the action level (in M4, M12 and M13). The map describes each square, not any home: only a three-month test measures a house.
From UK Health Security Agency and British Geological Survey radon map, checked at the sampled postcodes of each district guide in October 2026. Facts with their sources, not a rating: a district with nothing found isn't safe, and one with findings isn't unsafe. The maps describe the ground, not any home.
Check a postcode in Manchester
Free, from the UKHSA and British Geological Survey radon map for Great Britain. No account needed.
District by district
Sampled: the 1 km squares around 7 to 9 postcodes in each district
| District | Highest band found | Postcodes in an Affected Area |
|---|---|---|
| M1 | Under 1%: not an Affected Area | 0 of 12 |
| M2 | Under 1%: not an Affected Area | 0 of 12 |
| M4 | Up to 5–10% of homes above the action level | 1 of 8 |
| M8 | Under 1%: not an Affected Area | 0 of 8 |
| M9 | Under 1%: not an Affected Area | 0 of 8 |
| M11 | Under 1%: not an Affected Area | 0 of 12 |
| M12 | Up to 5–10% of homes above the action level | 12 of 12 |
| M13 | Up to 5–10% of homes above the action level | 1 of 12 |
| M14 | Under 1%: not an Affected Area | 0 of 12 |
| M15 | Under 1%: not an Affected Area | 0 of 12 |
| M18 | Under 1%: not an Affected Area | 0 of 12 |
| M19 | Under 1%: not an Affected Area | 0 of 8 |
| M20 | Under 1%: not an Affected Area | 0 of 12 |
| M21 | Under 1%: not an Affected Area | 0 of 12 |
| M22 | Under 1%: not an Affected Area | 0 of 12 |
| M23 | Under 1%: not an Affected Area | 0 of 12 |
| M40 | Up to 1–3% of homes above the action level | 2 of 8 |
Each district guide checks 7 to 9 postcodes spread across the district. "2 of 8 postcodes" means the finding was at two of those centres, not at a quarter of homes. Open a district for its own guide, with every postcode listed.
What it means when you buy in Manchester
It depends on the rocks and soil. The radon map gives each 1 km square the share of homes estimated to be above the action level:
- Below 1%: the square isn’t a radon Affected Area.
- 1% or more: it’s a radon Affected Area, and a test is recommended.
- The map describes the area, not the house: only a test measures a particular home.
- Raised radon can usually be reduced, for example with a radon sump.
Raised radon is common in some parts of the country and rare in others. Knowing the area’s potential tells you whether to ask about testing and protection before you commit.
A higher-radon area isn’t a reason on its own to walk away. Raised levels in a home can usually be reduced, for example with a radon sump, and a specialist can quote for it.
Questions to ask about a home in Manchester
- Has the house been tested for radon, and what was the result?
- Was radon protection fitted when it was built or since?
- If levels were raised, what was done, and was it tested again afterwards?
The full report checks the house itself, not the postcode, and ties each question to what it found. See an example report.