The TR method was developed by the Finnish Institute of Occupational Health for measuring the safety level of a construction site. The inspector walks the site and records every observation in one of six categories as either correct (safe) or incorrect (a defect). The TR index is the share of correct observations out of all observations, as a percentage.
Enter the observations in the table below and the form calculates the index for each category and for the whole site. The data is stored only in this browser.
How it works
Enter the site, inspectors and target level. When signed in, choose the site from a list and the details are filled in.
Walk the site with your phone: tap ✓ or ✗ in the category for every observation. For an incorrect one you can record the defect and the responsible party right away.
Press Document ready. You get a locked report you can save as a PDF, and you can send the defects straight to the responsible parties.
Free, no sign-up
Free, no sign-up
Inspection mode for phones
Large correct and incorrect buttons per category. Observations add up in the table, and a mistaken tap can be undone.
TR index calculated for you
The index for the whole site and each category while you record, with the comparison to the target shown in colour.
Defects recorded mid-round
After an incorrect tap a quick entry opens: the defect, location and responsible party go straight to the defect list.
Nothing gets lost
Every tap is saved on the device immediately. The inspection continues even if the screen turns off or the page is closed by accident.
Defects to responsible parties
Each subcontractor gets only their own defects by WhatsApp, email or PDF, optionally also in Finnish, Swedish, Estonian, Albanian or Russian.
Finished report and PDF
A locked report in English or Finnish, a clean A4 printout and signatures with your finger.
Document ready locks the form and opens the finished report. There you choose the report language, save the PDF and send the defects to the responsible parties.
How the TR index is calculated
TR index = correct / (correct + incorrect) × 100. If a round produces 180 observations of which 171 are correct, the index is 95.0 %.
The category indices show where corrective work should be focused. The index of the whole site is compared with the target level set by the client or the main contractor.
How often to inspect
In Finland, the Government Decree on the Safety of Construction Work (205/2009) requires a weekly safety inspection on construction sites, and the TR inspection is the established way to carry it out on building sites. A record is kept of the inspection and the defects found are corrected without delay.
Good practice is to review the defects of the previous inspection on the next round and to sign off the corrections with initials and a date.