Published 5 March 2026
Before calculating ROI, you need to understand what manual documentation actually costs. Based on surveys of 200+ UK site managers:
Average time per RAMS: 2.5 hours (range: 1.5-4 hours)
Average time per risk assessment: 45 minutes
Average time per toolbox talk: 30 minutes (preparation + delivery)
Average time per COSHH assessment: 40 minutes
Total weekly documentation time: 12-18 hours per site manager
At an average site manager salary of GBP 50,000 per year (approximately GBP 25/hour), 15 hours per week on documentation costs GBP 375/week, or approximately GBP 19,500 per year in professional time spent on paperwork.
Based on actual usage data from Site Manager AI customers:
RAMS with AI: 20-25 minutes total (2 min generation + 20 min review)
Risk assessment with AI: 10-12 minutes total
Toolbox talk with AI: 5-8 minutes total
COSHH assessment with AI: 10-15 minutes total
Total weekly documentation time: 3-5 hours per site manager
That is a time saving of approximately 10-12 hours per week. equivalent to getting an extra day back every week.
Annual time saved: 10 hours/week x 48 weeks = 480 hours
Value of time saved: 480 hours x GBP 25/hour = GBP 12,000
Cost of Site Manager AI: GBP 120/year (monthly plan) or GBP 150 one-time (lifetime)
ROI: 100x (monthly plan) or 80x (lifetime, first year only)
Even on the most conservative estimate. saving just 5 hours per week at a lower hourly rate. the ROI exceeds 30x. There are very few tools in construction that deliver this kind of return.
The financial ROI calculation does not capture the full benefit. AI-generated documentation is also:
Tools for construction professionals:
Trade Business Toolkit UK Small Business Bookkeeping SpreadsheetGenerate RAMS, method statements and risk assessments in seconds. Built for UK construction.
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