What training does an assessor actually have?
This varies more than people expect. Not every "energy assessor" has the same background, and the certification behind their name tells you a lot about what they're actually qualified to evaluate.
BPI Building Analyst (common in the US)
Issued by the Building Performance Institute. Certification requires passing a 100-question exam with a minimum 70% score, covering building science, combustion safety, and diagnostic testing. A BPI Building Analyst is trained specifically to identify health and safety issues (like backdrafting combustion appliances) alongside efficiency opportunities — not just insulation levels.
RESNET HERS Rater (common in the US, especially for new construction)
A more rigorous path: candidates complete two simulated ratings, a combustion safety testing session, and a written exam requiring 72% to pass. After certification, five probationary ratings must be completed within a year under a Rating Quality Assurance Provider before full certification. HERS Raters produce a numeric score (the HERS Index) that's directly comparable across homes — useful if you're also trying to understand your home's efficiency relative to a new build.
NRCan-registered Energy Advisor (Canada)
Required for an EnerGuide rating and for Canada Greener Homes Grant eligibility. These advisors are registered directly with Natural Resources Canada and follow a standardized national protocol, so a rating from one advisor is comparable to a rating from any other, anywhere in the country.
Utility-run program certifications (Mass Save, CleanBC, HRSP)
Many utility rebate programs require their contractors to hold an underlying certification (often BPI or NRCan) plus program-specific training on that utility's exact rebate rules and paperwork. This is why an assessor certified for CleanBC isn't automatically qualified to do a Mass Save assessment, even though the underlying building science is identical.
What actually happens during the visit
Plan for 1.5 to 3 hours. The exact scope varies by program, but most assessments cover:
- Attic: insulation depth, type, and condition; air leaks around the hatch and penetrations
- Basement/crawlspace: insulation, moisture signs, rim joist condition
- Exterior walls: insulation level, sometimes checked via small test holes
- Heating and cooling system: age, fuel type, efficiency rating, general condition
- Water heater: age, type, efficiency
- Windows and doors: condition and count
- Combustion safety test: checks gas appliances for backdrafting or carbon monoxide risk — this is the health-and-safety piece most homeowners don't expect
- Blower door test (often optional): measures whole-home air leakage with a calibrated fan
Questions to ask before you book
- "What certification do you hold, and can you show me the credential?"
- "Does this assessment include a combustion safety test?"
- "Will you do a blower door test, or is that a separate add-on?"
- "Is this assessment free, or is there a cost if I don't proceed with recommended work?"
- "How long until I get the written report?"
- "Will the report show my exact rebate eligibility, or just general recommendations?"
Questions to ask during the visit
- "What's the single upgrade that would make the biggest difference in this house?"
- "Is there anything here that's a safety issue, not just an efficiency issue?"
- "What income tier do I qualify for, and what does that change about my rebate?"
- "If I only do one thing this year, what should it be?"
- "Are there any red flags with my current heating system I should know about before I get quotes?"
What the report should contain
- Current condition of insulation, air sealing, and mechanical systems
- Specific upgrade recommendations, in priority order
- Estimated rebate amount for each recommended upgrade
- Any health/safety flags (combustion issues, moisture, etc.)
- A list of program-approved contractors, if applicable
If your report is missing priority order or safety findings, ask why — a thorough assessment should include both, not just a list of possible upgrades.
Red flags during an assessment
- The assessor is also trying to sell you equipment on the spot. A legitimate assessment is independent of the sales process — if the person doing your audit is the same person pressuring you to sign a contract before they leave, get a second opinion.
- No combustion safety test on a home with gas appliances. This is a genuine safety check, not an upsell — skipping it is a real gap, not just a missed opportunity.
- Vague answers about certification. "I've been doing this for years" isn't the same as holding BPI, RESNET, or NRCan credentials.
- No written report, or a report that's just a sales brochure. You should get specific numbers for your specific home, not generic marketing material.