Most BMS contractors between $1M and $5M get there the same way. Technical excellence and personal relationships. Both real assets. Neither enough at the next level.
BMS founders come up through engineering. The technical side gets learned from peers, projects, and time on the tools. The commercial side does not get taught anywhere in this industry. Pricing. Pipeline. Account development. Tender discipline. Commercial leadership. None of it.
The cost shows up everywhere. Absorbed variations. Tenders priced under pressure. Estimating time spent on cold work. Opportunities in existing accounts nobody develops. A founder who knows there's more in the business but can't find the time.
Three stages of growth. Most businesses straddle two of them. Naming which is the first job.