Kitchen projects rarely blow their budgets in one dramatic moment. They bleed — a surprise behind the drywall, a bid that did not include haul-away, forty small purchases nobody wrote down. We watch this happen from the countertop seat, and five money mistakes cause most of it.

1. No contingency reserve

Current budgeting guidance (as of 2025) is to hold 10-20 percent of the project total in reserve, leaning toward the high end for older homes — which describes much of the housing stock around Chicago. Behind the walls of a 1950s ranch or a 1920s bungalow, outdated wiring, corroded plumbing, and moisture-damaged subfloor are found, not invented. Without a reserve, the discovery either stalls the project or forces cheap substitutions mid-stream. Do not spend the reserve on upgrades until demolition and rough-in are behind you.

2. Comparing bids by the bottom line

The lowest bid is often the least complete one. Tear-out, plumbing disconnect and reconnect, sink cutouts, disposal reinstallation, and debris haul-away are classic exclusions that return as invoices — we itemize every one of them on our own quotes precisely because we have seen what the surprise versions cost. Give every bidder the same itemized scope, require exclusions in writing, and compare line by line. Before signing, ask for unit prices on likely extras so a mid-project addition is priced in advance rather than negotiated under pressure.

3. Letting the small stuff float

Knobs, pulls, trim, outlet covers, a faucet upgrade, switch plates: individually trivial, collectively hundreds to thousands of dollars. Itemize everything before demolition and track spending against the list weekly. When creep appears, cut from what is not yet ordered — hardware grade, accessory items — never from work already contracted.

4. Confusing sticker price with cost of ownership

The cheapest countertop or cabinet line is not the cheapest over ten years if it scratches, delaminates, or fails early. Compare materials on a 5-10 year basis: durability, maintenance time and products, repairability, expected life. Sometimes the budget option genuinely wins — a well-made laminate top in a rental, for instance, and we say that as a shop that does not even install laminate. The mistake is not choosing budget materials; it is choosing them without doing the ten-year math.

5. Changing the plan after work starts

Moving a sink, adding an outlet, upsizing the fridge opening — changes cost a fraction during design and a multiple during construction. The cheapest kitchen is the one designed completely before demolition. If a change is unavoidable, get it priced and signed as a written change order before the work happens, and check it against your contingency balance the same day.

The habit that ties it together

Review the budget weekly while work is underway: invoices against the itemized list, change orders against the contingency, and what remains unordered. Overruns are rarely one big number — they are many small ones that nobody was watching.

Sources

Common Mistakes Homeowners Make When Choosing Countertops — Majestic Stone Imports
How Much Should You Set Aside for Unforeseen Costs in a Home Renovation — CMS Material Solutions

Why Kitchen Remodel Budgets Blow Up: Five Money Mistakes