The License and Insurance Papers Come First: Verify an Installer Before the Pipe Is Cut

Ask for proof of licensing and liability coverage before you sign, then check each document with the issuing office, because a verbal assurance does not protect you if the work goes wrong.

Most homeowners check a provider's reviews and price, then sign. The paperwork that decides whether you are protected if the installation fails is usually the part nobody asks for. Before you let anyone cut into a supply line, confirm who is licensed to do the work, who carries insurance, and whether the company is authorized to install the equipment you bought. Our review method explains how we look at provider credentials, and the same questions work for any installer you are considering.

Find out whether your city or county licenses the trade

Licensing rules for plumbers and contractors vary across Missouri. Some cities and counties require a local license or registration for plumbing work, and some do not. Ask the installer which license covers the work on your address and get the license number and the name of the license holder. Then check that information with the office that issued it. A license number that does not match the business name on your quote is a question you need answered before the work starts.

Ask for a certificate of insurance, not a promise

Ask for a current certificate of general liability insurance and proof of workers compensation coverage if the company has employees. A certificate shows the insurer, the policy number, the coverage amounts, and the effective dates. Check that the dates cover the week of your job, and check that the work described on the certificate includes plumbing or the type of installation you are buying. If the installer says the insurance is in place but cannot produce the certificate, treat that as a missing document.

Confirm the manufacturer authorization

Some manufacturers require installation by an authorized dealer for the warranty to apply. Ask the provider to state in writing whether they are authorized for the brand and model you bought, and ask how that authorization affects the warranty on the equipment. Get the answer in writing on the quote, because a warranty that depends on the installer's status is only useful if the installer is the one who can honor it later.

Watch for the red flags

Be cautious if the person quoting the job will not give a license number, will not name who will actually do the work, asks for full payment before any work starts, or wants payment in a form that leaves no record. Be cautious if the business name changes between the quote, the invoice, and the license. None of these alone proves a problem, but together they mean you should verify more before you commit.

Save the documents with your equipment file

Keep copies of the license, the certificate of insurance, and the authorization statement with the quote and the invoice. If a problem appears after installation, you will need to tell a technician or an insurer exactly who did the work and what they were authorized to do.