Clearing
Make sure the proposed building area is accessible and that trees, brush, stumps, and debris are discussed before anyone assumes the site is ready.
Building up a pad
Some sites need fill or pad dirt to create the right building area. Ask who is supplying and placing that material and whether it is included in the concrete quote.
Compaction
Proper preparation under the slab matters. Ask the contractor what they expect the pad condition to be before forming and pouring.
Drainage
Walk the property after rain if possible. Show the contractor where water stands or runs. The slab, driveway, and surrounding grade need to work with the way water moves across the site.
Concrete-truck access
Ready-mix trucks are large and heavy. Narrow gates, soft ground, steep approaches, low branches, and tight turns can affect how the pour is handled. Mention access limits early.