The season is the constraint, and it does not negotiate
Michigan construction runs on a compressed working year. Frost depth limits foundation and excavation work, exterior trades are weather-bound, and the practical building season for much of the state runs from spring through late autumn. Demand is not usually the problem. Capacity inside a short season is.
The predictable result is an annual rhythm that most firms recognise and few fix: a quiet January and February when the following season could be sold, followed by a rush in May and June when the crews are already committed and half the enquiries have to be turned away or promised dates nobody believes. Measuring backlog against the building season instead of the calendar year gives winter a target and reverses the pattern.
Winter is a selling season, not a gap
A proposal issued in November that will not be built until April has a long silence in the middle of it, and silence is where those jobs are lost. The client is not comparing quality during that period, they are comparing who stayed in touch. Winter nurture sequences are the cheapest protection a Michigan builder has for work it has already earned on merit.