Structure per-push, seasonal, and per-inch snow contracts correctly

Steps

1. For per-push contracts, define the trigger depth (e.g., 1" or 2") in writing and document snowfall at the time of each trigger to support billing.
2. For seasonal flat-rate contracts, spell out included services explicitly (plowing, treatment, refreeze monitoring) since price doesn't vary with storm count in either a light or heavy winter.
3. For per-inch tiered pricing, agree in advance on the snowfall measurement source used to determine which tier applies, since tiered billing disputes hinge on measured depth.
4. Address the 'liability gap' risk in per-push contracts: a property with no new snowfall can still have refreeze/black ice, so specify whether between-storm ice monitoring is included.
5. Put trigger depths, the agreed measurement source, included/excluded services, and invoicing cadence into the written contract rather than leaving them as verbal understandings.