The BA-T is a field exam and nothing else: fifteen oral questions and a scored performance evaluation across sixteen task areas, with five safety items that must be done right whatever your overall score. It is the field exam Canadians have been crossing a border for.
BA-T is the credential that says you can actually perform residential diagnostics — not that you have read about them. BPI assesses it the only way that claim can honestly be assessed: by watching you do it.
There is no written paper. The whole certification is a four-hour field exam in two parts: an oral portion of fifteen questions put to you by the proctor — some with images to identify — and a performance portion where you carry out tasks that are scored against a predetermined list and discuss the topics in BPI’s BA-T Field Guide.
Pass mark is 70%. Five items are gated. It is open book. It is recorded.
BPI lists exactly one prerequisite for BA-T: the BPI Building Science Principles Certificate of Knowledge. That is an online exam BPI sells directly for US$119, with no prerequisites of its own and a lifetime term. Buy it from BPI, pass it, and the door to BA-T is open.
Worth knowing: BPI’s own handbook treats BA-T Domain 1 (Building Science, 10%) and Domain 2 (Buildings & Their Systems, 30%) as largely tested through knowledge questions and the online Building Science Principles test, with Domain 3 (Testing and Data Collection, 60%) carrying the field exam. The BSP work is not repeated — it is counted.
These must be completed correctly regardless of your score on everything else. All five are safety tasks, and all five are the kind of thing an experienced technician does without narrating it:
Not because they are difficult, but because a field exam scores what the proctor observes. If you prepare for one thing, prepare to perform the safety sequence deliberately and out loud — instrument preparation first, ambient sampling before anything else, appliances to pilot before the fan goes in the door.
Sixteen task areas, from BPI’s handbook, and worth reading as a preparation checklist:
| Area | What is assessed |
|---|---|
| Building and components | Pressure and thermal boundaries, measurements, conditioned space |
| Combustion safety testing | CAZ depressurization, spillage, venting |
| Carbon monoxide testing | Flue gas and ambient CO, gas oven CO |
| Combustible fuel leak testing | Natural gas, propane, fuel oil |
| Blower door testing | Setup, CFM50, pressure pan, zonal testing |
| Mechanical ventilation | System type, fan flow rate, space volume |
| Existing insulation | Type, thickness, R-value, condition |
| Heating and AC distribution | Duct testing, registers, grilles, filters |
| Domestic hot water | Type, size, venting, fuel source, safety |
| Appliances | Data plate information |
| Lighting | Total wattage, bulb types |
| Fenestrations | Windows and doors |
| Baseload | Definition and energy use |
| Water conservation | Flow rates, low-consumption fixtures |
| Health and safety | Electrical hazards, smoke and CO detector locations |
| Construction details | Wall types, attic ventilation, infiltration points |
The four highlighted rows are where the gated items live.
Three-year term, and two routes. Either accumulate 1,000 hours of field experience, field exam proctoring and/or whole-house field training across the three years and apply, or challenge the BA-T field exam current at the time of renewal. Renewal can start six months before expiry, requires re-attesting to BPI’s Code of Ethics, and is blocked by an open complaint.
For anyone doing this work full time, 1,000 hours over three years is roughly seven hours a week. If you are in the field, you are very likely renewing on experience rather than re-sitting a four-hour exam.
BA-T is the prerequisite for Building Analyst Professional, and BPI deactivates the BA-P if the BA-T underneath it expires. Two certifications, one expiry date that actually matters. Diarise it.
We administer the exam, arrange the proctor and the approved site, and run preparation separately for anyone who wants it. We do not mark the exam, cannot see your result before you do, and have no route to appeal it for you — grade appeals go to BPI within thirty days of the exam. We also do not sell pass guarantees, because no centre or trainer can promise a result on somebody else’s exam.
Exam structure, oral and performance portions, four-hour limit, 70% pass mark, the five gated items, the sixteen performance areas, domain weighting, prerequisites and both renewal routes: BPI Building Analyst Technician Scheme Handbook, revised 1 January 2023. Identification, proctoring, recording, open-book rules, attempt limits and appeal windows: BPI Core Certification Scheme Handbook, revised 9 April 2026. BA-P deactivation on BA-T lapse: BPI Building Analyst Professional Scheme Handbook, revised 1 January 2023. Term: BPI certifications list, updated 27 April 2026. Checked against BPI’s published documents on 21 October 2026.
BPI’s BA-T handbook carries a revision date of 1 January 2023, which is older than the other documents cited across this section. We have flagged that rather than hide it; if BPI has since revised the exam structure we will update this page, and you should read the current handbook before you book.
No. The whole certification is a four-hour field exam — fifteen oral questions put by the proctor, plus a scored performance evaluation. The written paper comes at BA-P, which is the next step up.
One thing: the BPI Building Science Principles certificate. BPI lists it as the only prerequisite. It is an online exam BPI sells directly, with no prerequisites of its own and a lifetime term.
Five safety tasks that must be done correctly regardless of your overall score: instrument preparation to ANSI/BPI-1200, ambient CO sampling, ambient combustible gas sampling on one floor, CAZ carbon monoxide monitoring during combustion safety testing, and setting combustion appliances to pilot before the blower door test.
Yes. Any reference you want to bring; the only thing prohibited is assistance from another person. Notes and scrap paper stay in the room and are destroyed by the proctor.
1,000 hours of field experience, field exam proctoring and/or whole-house field training across the three years, then apply. For full-time field work that is about seven hours a week.
You lose the Building Analyst Professional with it, if you hold one — BPI deactivates the BA-P when the BA-T prerequisite underneath it lapses.
No. BPI does not require training before any exam and does not approve, accredit or endorse training from anybody. We sell preparation separately and the seat fee is identical either way.
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The certification, the format, roughly when. We register you, arrange the proctor and confirm the date before you pay.
