How to Evaluate a Construction Estimate

When comparing estimates from multiple contractors for the same project, the biggest mistake is comparing only the bottom-line total. Two estimates for the 'same' project can differ by tens of thousands of dollars because they are not actually quoting the same scope, materials, or exclusions.

The first thing to check is what is explicitly included versus excluded. A lower estimate that excludes permit fees, disposal costs, or specific finishes that a higher estimate includes is not actually a lower price for the same work -- it is a smaller scope being compared against a larger one. Ask every contractor for a detailed, itemized breakdown rather than accepting a single lump-sum number with no supporting detail.

Material and product allowances deserve close comparison: an estimate with a $3/sqft flooring allowance versus one with a $10/sqft allowance for otherwise similar scope will show a large price gap that has nothing to do with labour efficiency -- it reflects a difference in the assumed finish level, which the owner needs to know before deciding.

Beyond price, evaluate the payment schedule (front-loaded payment schedules that ask for a large percentage before much work is done are a risk signal), the timeline being proposed (an unrealistically fast timeline can be a sign of an inexperienced estimator or a contractor planning to run multiple jobs simultaneously with less attention to yours), and whether the estimate clearly states what happens if unforeseen conditions are found -- a fixed price with no mechanism for legitimate unforeseen conditions is often a sign the contractor plans to negotiate change orders aggressively later.