Radon Testing & Monitoring Services Across the UK

Radon is a naturally occurring radioactive gas present in varying concentrations across the UK. While harmless outdoors, it can accumulate indoors or within confined ground conditions, presenting a significant health risk if not properly assessed. At Phase Ground Investigations, we provide professional radon survey, testing and monitoring services to support developers, consultants, property owners and construction professionals in managing radon safely and in line with UK regulations.

Our radon services deliver accurate, site-specific data to help you assess risk, design appropriate mitigation measures, and achieve planning and regulatory compliance.

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Why Radon Testing & Monitoring Matters

Radon is produced by the natural breakdown of uranium in rocks and soils. Certain areas of the UK have elevated radon potential, especially locations with specific geological formations. Indoors or within poor ventilation, radon can accumulate to harmful levels.

Long-term exposure to high radon concentrations is the second leading cause of lung cancer in the UK, contributing to over 10% of cases. For developers, landlords and employers, radon assessment is not just recommended — it is a legal requirement under:

HSE guidance
IRR17 (Ionising Radiations Regulations 2017)
Health & Safety at Work Act
Building Regulations (Part C)

Accurate radon monitoring allows you to:

Determine whether radon mitigation is required
Protect building occupants and site workers
Ensure regulatory and planning compliance
Avoid costly remediation later in development

Radon surveys are now a standard requirement for many planning applications and site risk assessments.

Our Radon Survey & Testing Services

Phase Ground Investigations offers a complete suite of radon testing and monitoring solutions for residential, commercial and land development projects.

1) In-Situ Radon Soil Gas Testing (Using MARKUS 10)

Our team uses the MARKUS 10 instrument to measure radon gas directly in soils, providing rapid and accurate in-field readings. This technique is ideal for developments in areas identified as medium or high risk on the UK Radon Atlas.

MARKUS 10 testing helps to:

Determine radon potential at development depth
Identify whether mitigation is required
Support planning applications and regulatory submissions
Provide input data for CLEA and RCLEA modelling

This type of radon soil gas testing is commonly requested for new housing developments, brownfield sites and sites undergoing ground gas assessments.

2) Radon Soil Monitoring (Window Sampling or Boreholes)

We also install temporary or long-term radon monitoring points within boreholes created during ground investigations. These allow extended monitoring periods or repeated measurements where a site has variable ground gas conditions.

Ideal for:

Contaminated land assessments
Gas protection design
Verification monitoring
Infrastructure and commercial projects

3) Radon Gas Monitoring for Existing Buildings

For properties already built, we offer indoor radon monitoring using calibrated detectors processed by accredited partner laboratories.

This is essential for:

Landlords and social housing providers
Employers responsible for workplace safety
Homeowners concerned about radon
Insurance or due diligence assessments

If readings exceed the UK Action Level of 200 Bq/m³, our team can advise on appropriate mitigation, ventilation or protection strategies.

4) Radon Risk Assessment & Reporting

National radon maps provide only broad generalised risk at a 1 km² grid scale. For planning, construction or investment decisions, a site-specific radon risk assessment is essential.

Our assessments combine:

MARKUS 10 soil gas data
Site-specific geology
Ground conditions from intrusive investigations
Gas monitoring results
National mapping data
Planning and regulatory requirements

These reports are designed for planning submissions, Phase 1 & 2 assessments, contaminated land reports and geo-environmental design work.

Why Site-Specific Radon Surveys Are Essential

A development may fall within a mapped radon area, but actual site risk can vary significantly, even between neighbouring plots. Site-specific monitoring ensures you have the accurate data required to:

Plan radon-resistant construction
Install appropriate ground gas protection
Demonstrate compliance for planning
Avoid delays caused by incomplete information

This early insight can save time, money and redesign costs later in the project.

Who We Work With

Our radon survey and monitoring services support:

Property developers
Planning consultants
Housing associations
Commercial property owners
Private homeowners
Local authorities
Ground engineering & construction firms

We work on projects of all sizes, from single residential plots to large-scale housing and commercial developments.

Why Choose Phase Ground Investigations?

Experienced radon monitoring and gas risk specialists
MARKUS 10 and industry-standard radon testing technology
Access to accredited laboratory partnerships
Nationwide UK coverage
Clear, actionable reporting tailored to your project
Support for planning, compliance, and remediation design

We ensure every assessment is undertaken safely, accurately and with full regulatory compliance.

Ready to Arrange a Radon Survey?

If you’re planning a development, assessing a brownfield site, or concerned about radon levels in an existing property, we’re here to help.

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