Radon Remediation Quotes in Ireland
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Radon is a colourless, odourless radioactive gas that seeps into buildings from uranium in the ground. You cannot see it, smell it, or taste it, but long-term exposure is the second leading cause of lung cancer after smoking. In Ireland, roughly 1 in 5 homes has radon levels above the national reference level of 200 Bq/m³ (becquerels per cubic metre), and certain parts of the country, particularly the west, midlands, and parts of Leinster, have significantly higher risk.
The only way to know if your home has a radon problem is to test. The EPA (Environmental Protection Agency) provides a radon risk map for Ireland, but the map shows general area risk, not individual house readings. Two houses on the same street can have dramatically different radon levels depending on ground conditions, foundation type, and ventilation. A postal test kit from the EPA or a private provider costs €50 to €70 and takes three months to give an accurate result.
If testing shows radon levels above 200 Bq/m³, remediation is straightforward and effective. The most common solution is an active radon sump: a small fan draws radon-laden air from beneath your floor slab and vents it safely above roof level. A properly installed sump system reduces radon concentrations by 90% or more and costs €800 to €1,500. For homes with suspended timber floors, a radon barrier membrane or improved sub-floor ventilation may be more appropriate.
Radon remediation is a specialist job requiring knowledge of building construction, air pressure dynamics, and radon behaviour. Comparing quotes from experienced radon professionals ensures your system is designed correctly and installed to deliver a lasting reduction in radon levels.
SEAI Grants May Apply
Some radon remediation work qualifies for SEAI grants of up to €8,000 or more. Check eligibility and current grant amounts on our energy guide.
Check SEAI Grants on HomeEnergyGuide.ieHow Much Does Radon Remediation Cost in Ireland?
Typical pricing for radon remediation services in Ireland (2026):
| Service | Typical Cost | Notes |
|---|---|---|
| Radon test kit | €50 | €80 | Type of detector |
| Active radon sump system | €800 | €1,500 | Property type, access |
| Radon barrier membrane | €1,500 | €3,000 | Floor area, access |
Radon sump installation costs depend on your floor type (concrete slab vs suspended timber), the size of your home, and the accessibility of the sub-floor space. A single sump with an inline fan typically handles a standard semi-detached house. Larger or irregularly shaped homes may need two sumps. Radon barrier membranes for suspended floors are more expensive due to labour and material costs. Running costs for a sump fan are minimal: approximately €30 to €50 per year in electricity.
What to Expect: The Radon Remediation Process
- Radon testing. Place a test detector in your home for a minimum of three months (the EPA recommends this as the standard measurement period). You can purchase detectors from the EPA or a private provider.
- If your result is above 200 Bq/m³, contact a radon remediation specialist. They visit your home to assess the floor construction, identify the best sump location, and recommend the most effective remediation method.
- For an active sump system: the specialist drills a hole through your floor slab, excavates a small cavity beneath it, installs a sump pipe, routes the pipe to the outside of the building (usually up through an external wall and above the eaves), and connects an inline fan.
- The fan runs continuously, creating a negative pressure zone beneath the slab that draws radon gas out before it can enter the house.
- Post-installation testing. After the system has been running for at least two weeks, a follow-up radon test confirms that levels have dropped below 200 Bq/m³. This test is essential to verify the system works.
Common Mistakes to Avoid
- Not testing because you think your area is low risk. The EPA map shows general risk, not individual house readings. High radon has been found in every county. Testing costs €50 and takes three months. There is no reason not to do it.
- Testing for too short a period. A test lasting less than three months can be misleading because radon levels fluctuate seasonally and daily. The EPA recommends a minimum three-month test for reliable results.
- Not retesting after remediation. Installing a sump without confirming it works is like taking medicine without checking it cured the illness. Post-installation testing is essential.
- Turning off the sump fan to save electricity. The fan costs €30 to €50 per year to run. Turning it off allows radon to build up again within days. The fan must run 24/7.
- Ignoring radon during a retrofit. Insulation and airtightness improvements can increase radon levels. If you are in a high-radon area and planning a retrofit, test first and incorporate remediation into the project.
What to Look for When Hiring a Radon Remediation Professional
Look for radon remediation specialists with EPA-recognised training and a track record of successful installations. There is no formal licensing requirement for radon work in Ireland, so experience and references are your main quality indicators. Ask for post-installation test results from previous jobs to verify they consistently achieve reductions below 200 Bq/m³. The specialist should carry public liability insurance. Be cautious of general builders offering radon work as a sideline without specific radon training or of providers who do not offer post-installation testing as part of their service.
Questions to Ask Your Radon Remediation Professional
- How many radon remediation systems have you installed? Experience matters. A specialist who has installed hundreds of systems will diagnose the correct solution faster and install it more effectively than someone who does it occasionally.
- What method do you recommend for my home and why? The best method depends on your floor construction. An active sump suits concrete slab floors. A radon barrier suits suspended timber floors. The specialist should explain their reasoning.
- Is post-installation testing included in your price? Without a follow-up test, you have no way to confirm the system has actually reduced radon to safe levels. This should be a standard part of the service.
- What are the ongoing running costs? A sump fan runs 24/7 and uses approximately €30 to €50 of electricity per year. The fan may need replacing every 7 to 10 years (cost €100 to €200). These are modest but worth knowing.
- Will the system be noisy? A properly installed inline fan is virtually silent inside the house. If mounted incorrectly or on a resonant surface, it can transmit vibration. Ask about noise management.
- How will the external pipework look? The sump pipe exits your home and runs up the external wall above the eaves. Discuss routing and colour to minimise visual impact.
Frequently Asked Questions
An active radon sump system for a standard semi-detached house costs €800 to €1,500 installed. More complex installations (larger homes, multiple sumps, difficult access) can reach €2,000. Radon barrier membranes for suspended timber floors cost €1,500 to €3,000 depending on the floor area. Follow-up testing should be included in the price or costs €50 to €70 separately. Annual running costs for the sump fan are approximately €30 to €50.
You must test. Radon is invisible and odourless, so there is no way to detect it without a measurement device. The EPA sells postal test kits for approximately €50. Place the detector in a frequently used ground-floor room for three months, then return it for analysis. The EPA's radon map at epa.ie gives a general indication of risk by area, but individual homes vary enormously even within the same street. Every home in Ireland should be tested regardless of area risk level.
The Irish reference level is 200 Bq/m³ (becquerels per cubic metre). Homes above this level should take remedial action. However, there is no truly safe level of radon: risk increases proportionally with concentration and duration of exposure. The World Health Organisation recommends a reference level of 100 Bq/m³. If your test result is between 100 and 200, remediation is advisable, especially if you are a long-term resident or if smokers live in the home (radon and smoking together multiply lung cancer risk significantly).
A properly installed active sump system reduces radon levels by 90% or more in the vast majority of cases. A home with a pre-remediation level of 800 Bq/m³ can be brought below 80 Bq/m³. The system works continuously and maintains low levels as long as the fan is running. Post-installation testing confirms the reduction. If the initial system does not achieve sufficient reduction (rare), modifications or a second sump can be added.
High radon is not a legal disclosure requirement when selling property in Ireland. However, informed buyers (especially those with young families) are increasingly testing during the purchase process. Having a remediation system already in place, with documented post-installation test results showing low levels, gives buyers confidence and removes a potential objection. Remediation is inexpensive relative to property values and is a net positive for saleability.
The EPA radon map shows that high-radon areas are concentrated in the west, northwest, and parts of the midlands, with notable hotspots in counties Galway, Mayo, Sligo, Clare, Kerry, Waterford, Kilkenny, and Carlow. However, elevated radon has been found in every county in Ireland, including Dublin. Ground conditions, not geography alone, determine radon levels. The only reliable way to know your home's level is to test it.
It can. Making your home more airtight through insulation and draught-proofing can increase indoor radon concentrations because the gas has fewer escape routes. This is why radon should always be considered as part of a retrofit project. If your home is in a high-radon area and you are planning insulation or a full retrofit, test for radon first and include remediation in the project if needed.
Radon concentrations are highest on the ground floor and basement level because the gas enters from the ground directly beneath. Upper floors typically have lower levels, but radon can rise through stairwells and internal air movement. Testing should always be done on the ground floor in the most frequently occupied room.
Radon Remediation Quotes by County
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