“Keeping Your Space Healthy”
Mold Remediation Companies in Calgary: 9 Questions to Ask Before You Hire
Table of Contents
- Before you call anyone
- 1. Will you inspect the home before quoting?
- 2. How will the moisture source be handled?
- 3. Do you remove damaged materials or treat them in place?
- 4. What training and certification does your crew have?
- 5. What insurance and WCB coverage do you carry?
- 6. Are you licensed to operate in Calgary?
- 7. What testing will you do, and with which lab?
- 8. Who confirms the job is finished?
- 9. What does the written contract say?
- Red flags when comparing mold removal companies
- Next Step
- Frequently Asked Questions
Executive Summary
Health Canada recommends treating the hiring of a mould professional the way you would a home renovation: get proposals, interview candidates, and ask for the approach, the fees for each phase, and what documentation you will receive. The Government of Alberta adds the basics for any contractor: written estimates, insurance and WCB coverage, a written contract and no large up-front demands. The nine questions below combine both sets of advice into a checklist you can take to any company. When you are comparing mold remediation companies in Calgary, the quote is the least useful thing to compare first. Two quotes can describe very different jobs. The more reliable approach is to ask the same nine questions of every company and see whose answers are specific, in writing and consistent with Health Canada and Alberta government guidance. This article gives you those nine questions, what a good answer looks like, and the warning signs to watch for. Last reviewed October 2026 against the government sources listed at the end of this article. This is general information, not advice about a specific property.
Before you call anyone
Not every mold problem needs a company. Health Canada’s decision chart treats a small area (three or fewer patches totalling under 1 m²) as something that can be cleaned using proper precautions, and a medium area as one where assessment by a qualified professional is recommended but cleanup is often possible without one. A single patch larger than 3 m² needs expert assessment and cleanup [1]. Health Canada also lists situations that call for a professional regardless of size: mould that returns after cleaning, suspected hidden mould inside walls or above ceilings, water from floods or leaks contaminated with sewage or chemicals, and flooding that has reached wall or ceiling cavities [1]. If you are in one of those situations, the nine questions below are for you. If you are not sure which one you are in, a mold inspection and assessment is a sensible first step, and our guide to DIY mold removal vs. hiring a professional explains the decision.
1. Will you inspect the home before quoting?
What to listen for: a site visit, then a written scope. Health Canada says a preliminary site visit may be needed for the professional to understand the problem and generate an appropriate response, and that proposals should indicate estimated fees and expenses for each planned phase [1]. Alberta’s contractor guidance lists “quote a price without seeing a job” among the behaviours to avoid [2]. Why it matters: a price given over the phone can only be an assumption about what is behind the walls.
2. How will the moisture source be handled?
What to listen for: a clear statement of who finds and fixes the water problem. Health Canada says that unless the cause of the moisture problem is identified and solved, mould will reappear, and that the building envelope must be repaired if water is entering from outside [1]. A remediation company may find the source and recommend the repair, or the repair may belong to a roofer, plumber or foundation contractor. Either is fine; “we’ll clean it and see” is not. Why it matters: this single answer predicts whether you are paying for a lasting fix or a temporary one. Alberta Mold Pros’ mold removal page says every project starts with identifying the source of moisture, because without that step, removal is temporary at best.
3. Do you remove damaged materials or treat them in place?
What to listen for: removal of damaged materials as the priority. Health Canada’s list of ways to recognize qualified professionals includes that the company prioritizes removing damaged materials that have been sites of mould growth rather than attempting to seal or chemically treat them [1]. Alberta Health Services’ requirements for extensively contaminated buildings go further: remediation consisting of treatment only with a biocide or disinfectant, such as bleach, is not acceptable, and the presence of any mould, whether alive or dead, calls for removal and surface cleaning [3]. Why it matters: painting or spraying over mould hides it temporarily. Health Canada states plainly that painting over a mouldy surface does not kill mould or stop it from growing back [1].
4. What training and certification does your crew have?
What to listen for: specific credentials you can verify. Health Canada says one way to recognize qualified professionals is certification from the Institute of Inspection Cleaning and Restoration Certification (IICRC), and/or training certified by the US Occupational Safety and Health Administration (OSHA), or equivalent training and experience [1]. Ask which people on your job hold which credentials, not just whether the company “is certified.” Why it matters: a named, checkable credential is stronger evidence than a general claim of expertise.
5. What insurance and WCB coverage do you carry?
What to listen for: a certificate, not a verbal assurance. Health Canada notes that, if mould removal is involved, the company should have liability insurance specifically covering that task [1]. The Government of Alberta advises making sure the contractor and tradespeople have Workers’ Compensation Board (WCB) coverage, asking for the WCB number, and asking to see an insurance certificate showing public liability and property damage coverage for all workers on the job [2]. Why it matters: the same Alberta page warns that if uninsured workers hurt themselves on your property, you and the other party would have to agree on who is liable [2].
6. Are you licensed to operate in Calgary?
What to listen for: a City of Calgary business licence number you can look up. The City says contractors are required to hold a valid Calgary business licence and that you can verify one through its licensed contractor tool [4]. Separately, Alberta says contractors who accept money before work is complete and discuss or finalize a contract away from their normal place of business, such as at your home, must be licensed by Service Alberta as prepaid contractors and post a security [2]. Why it matters: both checks take minutes and are free.
7. What testing will you do, and with which lab?
What to listen for: testing that serves a purpose. Health Canada says a systematic approach based on a thorough visual inspection is usually more effective than relying on extensive air, bulk or swab testing, and it asks you to find out what criteria will decide on testing or remediation strategies [1]. It generally does not recommend air testing for mould, though a qualified professional may recommend a particular non-viable air test when concerns remain unexplained after inspection [1]. If a lab is involved, Health Canada says it should hold accreditation to the ISO/IEC 17025:2017 standard through a recognized body [1]. Why it matters: a company that proposes a large testing package up front, or one that tests nothing and cannot explain why, both deserve follow-up questions. Our explainer on mold testing vs. mold inspection covers when each makes sense.
8. Who confirms the job is finished?
What to listen for: a plan for verification. For major projects with extensive mould growth, Health Canada suggests a written outline that includes the anticipated need for a post-remediation inspection by an independent third-party consultant, and says that when extensive cleanup involves structural elements like walls, the company should recommend you consider hiring a separate company for a post-remediation “clearance” study [1]. Why it matters: independent verification separates the work from the sign-off. For mold after water damage, Alberta Mold Pros’ site says that when third-party testing is required, the company coordinates with independent hygienists to confirm conditions meet clearance criteria before reconstruction proceeds.
9. What does the written contract say?
What to listen for: a written contract with a detailed description of the work, materials, subcontracted work, permits, a payment schedule, warranties, insurance and WCB information, and cancellation rights. These are all items on the Government of Alberta’s contract checklist [2]. Alberta also says to get written estimates from more than one business, with itemized costs, start and completion dates, any guarantees and the payment method [2], and Health Canada adds that proposals should show the project scope, documentation to be provided and a reasonable schedule that accounts for occupants’ health and safety [1]. Why it matters: verbal contracts are hard to prove, as Alberta notes [2].
Red flags when comparing mold removal companies
The Government of Alberta lists behaviours to avoid in any contractor. Several translate directly to mold work [2]:
- Knocking on your door to say they just happen to be working nearby and can give you a special price.
- Quoting a price without seeing the job.
- Demanding a large down payment to buy materials.
- Refusing to give you a written contract.
- Offering only a post office box or an answering service as contact details.
- Refusing to commit to a start and completion date.
A company that cannot answer questions 1 to 9 clearly, in writing, belongs on the same list.
Next Step
You can put these nine questions to Alberta Mold Pros as well. The company is a family-owned Calgary business with a team certified in mold remediation, removal and testing, according to its About page, and it has won Best of TrustedPros each year since 2016. If you want a site visit and a written scope, call 403-701-9687 or request a quote. If your project also involves older materials that might contain asbestos, see our guide to how to vet an asbestos contractor.
Frequently Asked Questions
How do I choose a mold remediation company in Calgary?+
What certifications should a mold remediation company have?+
Should the company that removes the mold also test that it is gone?+
Is it a red flag if a company quotes a price without seeing the job?+
Do mold remediation companies need a licence in Calgary?+
About the Author
Alberta Mold Pros is a certified, family-owned mold remediation and testing company serving Calgary, Airdrie, Cochrane, Okotoks, and Chestermere. The team specializes in mold assessment, remediation, and asbestos abatement, and has been recognized as a TrustedPros Best of Award winner every year since 2016. Disclaimer: This article is for general informational purposes and does not replace an in-person assessment. Mold identification and remediation should always be assessed by a qualified professional.
Sources
- Health Canada, “Guide to addressing moisture and mould indoors,” published January 2023: https://www.canada.ca/en/health-canada/services/publications/healthy-living/addressing-moisture-mould-your-home.html
- Government of Alberta, “Hiring a contractor”: https://www.alberta.ca/hiring-contractor
- Alberta Health Services, “Fungal Air Testing, Investigation and Reporting Requirements for Extensively Mould-Contaminated Buildings”: https://www.ahs.ca/assets/wf/eph/wf-eh-fungal-air-testing-for-mould-contaminated-buildings.pdf
- The City of Calgary, “Hiring a contractor”: https://www.calgary.ca/development/home-building/contracting-tips.html
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