The Five Vendor Mistakes That Cost Property Owners the Most

When something breaks or a project needs to start, the instinct is to call whoever can show up fastest. That is how you end up with the wrong vendor. A contractor who is available tomorrow is not necessarily good. They might be between quality jobs, or they might be available because their last three clients did not call them back.

The way you find out which is that: vet them. Check the license. Confirm it is active and matches the scope of work. Get a current certificate of insurance. Ask for two references from the same property type as yours — not a restaurant reference for a residential project. Then make one of those reference calls and ask a specific question: what went wrong on the job, and how did they handle it? Every project has problems. What matters is the response. If the reference cannot name a single issue, they are not being honest with you.

An uninsured contractor gets hurt on your property and you are exposed. Their medical bills, their lost wages, their attorney. All of it can land on your homeowner policy or, worse, on you personally. This is not a hypothetical. It happens constantly, and the property owner almost never realizes the gap until it is too late.

What you need is a Certificate of Insurance (COI). It proves the contractor carries active coverage. The minimums you should require: general liability of at least $1 million per occurrence. If the contractor has employees, workers compensation is non-negotiable. Request the COI before any work begins — not after, not on the first day, before. A legitimate contractor will have this document ready in minutes. If they push back or say they will send it later, that is your answer. Find someone else.

The standard payment structure for renovation work exists for a reason: 10% deposit to secure the project, milestone-based payments as work is completed and documented, and 10% retention held until final completion and sign-off. This structure keeps incentives aligned. The contractor earns payment by delivering results. You maintain leverage throughout.

When you pay 50% or more upfront, you have removed the contractor's primary motivation to stay on schedule. The money is already in their account. Your project gets deprioritized behind the next client whose deposit they are chasing. We have seen this pattern dozens of times. Large upfront payments are the single most common factor in stalled projects. The most frequent justification: "I need materials money upfront." The right answer is not to hand them a check — pay the materials supplier directly.

Verbal agreements kill projects. Not because contractors are dishonest, but because two people can have completely different understandings of the same conversation. What you need is a written scope of work before a single dollar changes hands. It should specify the exact work to be done, the materials (by brand, model, or spec), the start and completion dates, the milestone payment schedule tied to deliverables, and what happens if the scope changes.

Any change to scope mid-project requires a written change order with a new price and a new timeline. No exceptions. The change order discipline is where most project budgets get destroyed — not from bad estimates, but from verbal approvals that balloon into contested invoices at the end.

The punch list is the final walkthrough document that captures every incomplete or deficient item before the final payment is released. Most property owners skip it because they are exhausted by the end of a project, want it to be done, and just pay. That is exactly when you have the most leverage — and when you give it up.

Do the walkthrough. Write down every item. Give the contractor the list in writing and hold your 10% retention until every item is resolved and confirmed. A competent contractor will not object to this — it is standard practice. The ones who push back on a punch list are the ones with something to hide.