The short version
- Compare scope and assumptions, not only totals
- Check what each bid says about rock, water and restoration
- Ask how changes are priced and approved
- The lowest bid is not always the cheapest outcome
Line up the scopes
Put the bids side by side and list what each includes: locates, permits, trench depth, bedding, backfill, compaction, haul-off, restoration. A column that is blank in one bid is probably not included.
Ask each contractor to price the same scope so the numbers can be compared.
Check the assumptions
Bids often assume no rock, no groundwater and easy access. If those assumptions are wrong, there will be change orders. Ask each bidder what they assumed and how extra work would be priced.
A bid that states its assumptions honestly is easier to trust.
Look at the process
Ask how the contractor communicates, schedules and handles cleanup. Ask for references and photos of similar work. Ask how they handle safety and utilities.
Dependable work shows in how they answer.
Decide on value
The lowest bid may skip things you will pay for later, such as restoration or compaction. The highest may include extras you do not need. Pick the bid that is clear, complete and from a contractor you trust.
Get the choice in writing.
General information, not engineering, legal or safety advice. Rules and requirements vary by utility, city and county.
