CalcStack — free, instant, no signup. The interactive calculator loads automatically.
The $46,500 bid with $4,000 of exclusions is a $50,500 project — the cheapest quote is rarely the cheapest job.
Every homeowner is told to get three bids; almost nobody is told how to compare them. Raw prices lie because contractors bid different scopes: one excludes flooring, another carries a $500 allowance against $4,000 of real material, a third quotes 10 weeks against 6 — and a month of rent overlap or takeout dinners is real money. This calculator normalizes each bid to true cost (price + exclusions you'll still pay + schedule cost), shows the honest spread, and flags the pattern every experienced homeowner learns once: a bid more than 15% below the middle is usually priced to win the signature and recovered later in change orders.
Owners with three quotes use it before signing: exclusions and schedule get priced back in, and the $46.5k bid with $4k of gaps exposes itself as a $50.5k project — while a bid 15% under the middle triggers the change-order warning.
Scope asymmetry. Contractors bid the same project differently: one prices real flooring, another carries a $500 allowance against your $4,000 taste — the difference doesn't disappear, it just moves from the bid to your wallet after signing. Change orders are the second mechanism: work "not included" in a low bid returns at retail-plus pricing once the contractor owns the job. That's why this tool adds exclusions back before ranking. The fix at bid time: hand all three contractors the SAME written scope and material list, and require each to list exclusions explicitly. A bid with no exclusion list isn't complete — it's unverifiable.
It's a rule of thumb, not a law — but the logic is mechanical. Licensed contractors pay similar prices for labor, materials, insurance, and permits in the same market, so a bid far below the middle means something is missing: scope, insurance, permits, realistic labor hours, or profit (the last one means the contractor may not finish). Sometimes it's legitimate — a slow season, a crew between jobs, a specialist for whom your job is quick. Verify before rejecting or accepting: ask for the exclusion list, proof of insurance and license, the payment schedule (never more than ~10–30% down), and references whose projects finished on budget. If the low bid survives verification, take it and enjoy the discount.
Milestones, not dates, and never front-loaded. A reasonable structure: ~10% at signing (some states cap deposits by law — California caps at $1,000 or 10%, whichever is less), progress payments tied to completed phases you can inspect (demolition done, rough-in passed inspection, drywall hung), and a final 10–15% only after walkthrough and punch list. Red flags: large deposits ("I need money for materials" — established contractors have supplier credit), cash-only discounts, and pressure to pay ahead of milestones. The payment schedule is your only real leverage once work begins — money you've paid is leverage you've spent.