Radon and Buying a Home in Colorado: Testing and Next Steps

Put radon testing on the purchase plan early

Radon is a specific due-diligence question, not something a buyer should resolve by guessing from the home’s appearance or relying on an unrelated property’s experience. Colorado encourages homebuyers to test during transaction inspections using a licensed radon measurement professional. Review the Colorado Department of Public Health and Environment’s testing guidance and decide early how to fit testing into your inspection plan.

Start by identifying who will arrange the measurement, how the professional will access the home, what areas are included and how you will receive the results. If you are already coordinating an inspection, ask whether radon measurement is included or must be arranged separately. Do not assume that a general home inspection automatically includes a radon test. Confirm the actual service, its instructions and the information the professional needs from you.

Testing is most useful when it answers a clear question about the home being purchased. Keep the report with the other inspection documents, note where the measurement was taken and record any conditions the professional asks you to maintain. A result is property-specific; do not infer a result from a neighborhood, another home or a prior owner’s experience. For broader scheduling, review the home-buying resources and put the test on the same working calendar as other inspection steps.

Choose the testing area deliberately

For a transaction, EPA recommends testing the lowest area that could become living space, such as an unfinished basement. Colorado’s guidance encourages buyers to follow the measurement professional’s or device instructions and arrange access and test conditions. See the state testing page. Ask the professional to explain which location is appropriate for the home and your intended use rather than choosing a spot based on convenience alone.

Discuss the household’s planned use of lower-level areas. A basement used for storage today may be considered differently if you may finish or regularly use it as living space. The EPA recommendation focuses on the lowest area that could become living space; it does not mean every possible room must be measured in the same way. Let the licensed professional guide the test location and explain the measurement’s scope.

Before the test, ask what access is required and what conditions you must maintain. Follow those directions rather than improvising. If access is restricted, an area is unfinished or construction is underway, tell the professional so they can explain the implications. Record the test location and relevant instructions in your file. This makes the result easier to interpret and prevents later confusion about which area was measured.

Use a clear test coordination checklist

Transaction timing, access and test conditions can make coordination important. Use this checklist to keep the task concrete:

1. Ask whether radon measurement is included in your inspection plan or needs a separate appointment.
2. Confirm that the measurement professional is licensed, and ask which area they recommend testing.
3. Arrange access to the lowest area that could become living space, with the professional’s instructions in hand.
4. Tell the professional about access limits, unfinished areas or intended future use that may affect the location question.
5. Ask how results will be delivered and what the report will identify about location and test conditions.
6. Save the report and connect any follow-up to the actual purchase contract and its dates.

The list helps you arrange a useful measurement; it does not establish a specific test duration, result threshold or contractual remedy. Follow the professional’s instructions and the applicable transaction documents. If you are coordinating other investigations, do not assume one appointment substitutes for a separate specialist’s work. Colorado notes that a general inspection is limited and that qualified specialists may be needed for specific concerns. See the state’s home-buying process guidance.

Read the result as a finding about this home

When you receive the report, confirm which area was measured and whether the professional documents any testing conditions or limitations. If a result is elevated, Colorado advises discussing mitigation with the seller and a qualified professional. The state’s radon testing guidance explains the next step. Avoid making assumptions about what a particular result means for another property or about what a seller must do.

Ask the professional to explain the report and what action they recommend for this home. If you want a mitigation proposal or system evaluation, contact a qualified mitigation professional and make sure the discussion concerns the same property and measured area. Keep the written recommendation and any proposed work separate from your initial measurement report. A measurement documents a test; it does not, by itself, prove that a proposed system will address every question you have.

Then review the signed purchase agreement. Colorado’s contract guidance says that inspection and other conditions depend on contract language, which should specify what must happen, deadlines, rights if a condition is unmet or waived, and possible consequences. Read the state’s sales-contract overview. The fact that a finding is elevated does not create an automatic seller payment or installation obligation in the supplied guidance. Keep your response tied to the written agreement and the actual test results.

Do not treat an existing system as a test result

A visible mitigation system may prompt useful questions, but its presence does not tell you what a current measurement will show. Colorado specifically says to test even when a mitigation system is already installed; existing equipment does not replace measurement. See the state radon FAQ. Ask whether the home has a recent report, where and when it was measured, and whether any system information or service records are available.

If the home already has equipment, note what is visible and ask a licensed measurement professional about testing. If a reading is elevated or the system needs evaluation, contact a licensed mitigation professional, as the state recommends. Do not infer from equipment appearance that the system is operating as intended or that a specific radon level exists. The professional’s measurement and system assessment address different questions.

Keep these questions distinct in your notes: What does the current measurement show? What does the professional say about the measurement? What evaluation, if any, is recommended for existing equipment? What does the contract say about inspection findings and written notices? This separation helps prevent the mere presence of a system from being treated as proof of either a problem or a solution.

Coordinate findings with the contract, not assumptions

Before testing, review the purchase contract calendar and identify the applicable inspection condition and any notice process. Colorado explains that contracts can include inspection, financing, appraisal and other conditions, and that the contract language defines deadlines and rights if conditions are unmet or waived. Use that overview as a prompt to examine your own agreement. A generic timeline cannot establish what applies to your transaction.

If a test result prompts a request or negotiation, follow the written contract process. Keep the report, any professional explanation and communications together. Colorado’s official forms page lists an Inspection Objection Notice and Inspection Resolution among current forms, but the presence or name of a form does not establish a specific right, deadline or outcome. Use the appropriate current form and transaction-specific guidance. Check the official forms page.

Earnest money is also governed by the agreement. Colorado says its amount and refund conditions depend on the signed contract; a refund should not be presumed just because an inspection raises a question. Review the state’s buyer guide. If timing is tight, promptly identify the issue and the contract language involved so you can make a considered decision rather than relying on an informal assurance.

Keep a radon decision record

A compact decision record can make an unfamiliar result manageable. Use one row for each step: date, person or company, area measured, report received, question asked, answer received and next action. Add whether the home already has a mitigation system and what information is available about it. Keep that fact separate from the current test result, since Colorado says existing equipment does not replace measurement.

Use the record to track facts, not to diagnose or predict. If the professional recommends follow-up, write down the exact question and who is qualified to answer it. If the result affects your purchase decision, connect the response to the contract rather than assuming a particular outcome.

Plan the next step for each possible result

Before results arrive, decide how you will respond to different kinds of information. If the report raises no follow-up question, retain it with your home records. If the report is unclear, ask the measurement professional to explain the location, conditions and meaning. If findings are elevated, discuss mitigation with the seller and a qualified professional, as Colorado advises. If a system is present, test anyway and ask for a licensed professional’s system evaluation when appropriate. These are planning branches, not predictions about what a particular test will show.

Finally, check whether your decision depends on a measurement, a specialist’s recommendation, a proposed response or the contract’s handling of an issue. Write down the relevant document and date for each. If you are arranging a move alongside a sale, sell-and-buy planning can help coordinate overlapping transaction tasks. A measured, documented approach lets you make a property-specific choice without assuming the seller must install or pay for mitigation.

Check the radon information provided with the sale

The state’s radon and real estate resource page identifies the Colorado transaction brochure as required for real estate transactions and rental agreements. Ask your broker to walk through the radon information supplied for this sale, and keep it with the test report and any system records you receive. Resolve questions about the paperwork with the appropriate professional rather than assuming a new test answers every disclosure question.

This guide provides general planning information, not individualized legal, tax, insurance or lending advice. Confirm your transaction’s documents, deadlines, costs and requirements with the appropriate professionals.