Driveway work has a well-known con: a crew with concrete “left over” from a job down the road, offering a price if you decide today. Michigan’s licensing agency warns homeowners about exactly that, and tells them a real estimate should state “the total price, the terms of payment, the kind of materials to be used and the expected time it will take to complete the job.” The honest contractor’s answer to the cheap pitch is not a cheaper number. It is an estimate that shows what the number buys.
Air in the mix, where the weather calls for it. The model residential code requires air-entrained concrete wherever its weathering map shows moderate or severe exposure. The Portland Cement Association explains why: billions of microscopic air cells per cubic foot give freezing water room to expand, usually 4 to 7% of the volume. An estimate that names it answers a question the low bid hopes nobody asks.
How the slab will cure. ACI says that between 40 and 60°F, good results come from prolonging moist curing, and that below 40°F hydration slows sharply. A line on curing and cold-weather protection tells a homeowner in October that you have thought about the week after the pour, not only the day of it.
Base, thickness and reinforcement. These are the parts a homeowner cannot see once the truck leaves, which is why they belong on paper and in photos taken before the pour.
Permits and digging. The model code exempts driveways and sidewalks from a building permit, and retaining walls up to 4 feet unless they support a surcharge, but local rules differ. Fairfax County, Virginia, adds that driveway work in the state right-of-way may need a VDOT permit, and wants permits for retaining walls holding back 3 feet of earth or more. 811 asks for a call a few business days before any digging, and says skipping it is the top cause of damage to buried utilities each year. Say on the estimate who files the permit and who calls in the locates.
The same lines belong on your website: a page on what your estimate includes, a permit note for each county you work in, and photos of base and steel before the pour. Homeowners who read that page arrive asking better questions, and the leftover-concrete crew has nothing to answer them with.