Estimate, quote, or proposal: the words matter
An estimate is an informed approximation and can change. A quote or fixed-price proposal is a commitment to a price for a defined scope. A time-and-materials agreement caps nothing unless it states a not-to-exceed figure. Ask which one you are holding, and get the answer on the document.
Most disputes we hear about are not about dishonesty; they are about a homeowner treating an estimate as a quote.
The ten items a complete proposal contains
Company legal name, address, license number where applicable, and contact. A description of the problem being solved, not just the product being sold. Specific materials with brand, model, and quantity. Labor scope and expected duration. Permit responsibility and whether fees are included. Access, demolition, and restoration details, which matter enormously on foundation and sewer work.
Also: haul-away and disposal, warranty terms for labor and for parts with their durations, the payment schedule tied to milestones, and the conditions under which the price can change. If any of those ten are missing, ask for them before comparing bids.
Trade-specific items to insist on
HVAC: model numbers for both the outdoor and indoor units, the SEER2 or AFUE rating of the matched pair rather than one component, reference to a Manual J load calculation, and whether the line set, thermostat, pad, disconnect, and condensate handling are included.
Plumbing: pipe material and diameter, fitting type, linear feet involved, and for sewer work whether a camera inspection recording is provided before and after. Foundation: the number and type of piers, depth criteria for refusal, engineer involvement, whether the warranty is transferable, and how landscaping and concrete are restored.
Comparing bids that look nothing alike
Build a simple three-column table with one row per line item and put the bids side by side. Gaps become obvious fast: one contractor priced 8 piers and another priced 5, or one included the permit and another did not. That table is also the fairest way to go back to a contractor and ask about a difference.
The cheapest bid is a legitimate choice when the scopes are equal. It is a bad choice when it is cheap because it is smaller. When one bid is dramatically lower, the reason is almost always scope, materials, or permit handling.
Payment terms that protect you
Reasonable structures are a materials deposit followed by progress payments and a final payment on completion, or on passing inspection for permitted work. A demand for full payment up front, or a large deposit on a job that has not been scheduled, is a risk.
Pay by check or credit card rather than cash or a payment app, so there is a record and, with a card, a dispute mechanism. Keep the signed proposal, all change orders in writing, the permit and inspection record, warranty documents, and photos of the work in progress.
Change orders and the fine print
Anything discovered mid-job that changes scope should generate a written change order with its own price, signed before that work proceeds. Verbal change orders are where projects go sideways.
Read for automatic renewal on maintenance agreements, financing terms and any dealer fees rolled into the price, restocking or cancellation fees, and lien language. Missouri contractors have mechanic's lien rights; requesting lien waivers with each payment on larger projects is a normal request.
Frequently asked questions
Should an estimate be free?
Sales estimates for replacement work are usually free. Diagnostic visits for a broken system are usually charged, often $89 to $150 locally, and frequently credited toward the repair. Ask which applies before scheduling.
How long should a quote stay valid?
Thirty days is typical. Equipment and material pricing changes, so ask the contractor to state the expiration date on the document.
Is it rude to ask a contractor to itemize?
No. Itemization is standard professional practice, and it protects both parties by defining scope. A refusal to itemize on a large project is a meaningful signal.
Sources and further reading
Price ranges in this guide come from quotes and invoices shared with STL Home Pros by St. Louis area homeowners and contractors. Technical and climate references are listed below.
About the author
Nick Cascani is a New York native who has called St. Louis home for the last few years. He believes getting professional home service should be simple and convenient, and he writes these guides to help local homeowners make confident decisions about their HVAC, plumbing, and foundation projects.
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