Sue a Contractor in Wisconsin Small Claims Court: What You Need to Know

When a Contractor Dispute Belongs in Small Claims

You paid a deposit for kitchen cabinets and the crew never came back. The roofer finished the job, but the work is already leaking. The handyman cashed your check and disappeared. These are the disputes that fill Wisconsin small claims dockets.

If your claim is $10,000 or less (rising to $15,000 on January 1, 2027, under 2025 Wisconsin Act 105), you can file in small claims court rather than hiring a lawyer for a full civil case. Contractor deposit disputes and breach of contract claims for unfinished or defective work are straightforward money claims under Wis. Stat. Chapter 799. Tort claims — say the contractor damaged your property through negligence — are capped at $5,000.

Before filing, consider a complaint to the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP). DATCP handles home improvement complaints under ATCP 110 and may mediate. But mediation is voluntary, and if the contractor ignores it, small claims court is your next step.

Verify the Contractor's Legal Name

This is the step most homeowners skip, and it can tank the entire case. If you sue "Mike's Remodeling" but the contractor actually operates as "Kowalski Construction LLC," your judgment may be unenforceable — you won a case against an entity that does not legally exist.

Search the Wisconsin Department of Financial Institutions (DFI) database at dfi.wi.gov. Look up the contractor's business name and check:

• The exact registered name (corporation, LLC, or sole proprietorship)
• Whether the entity is active or dissolved
• The name and street address of the registered agent (the person you serve with court papers)

If the contractor is a sole proprietor with no registered entity, name them personally: "John Doe d/b/a Mike's Remodeling."

Send a Demand Letter First

Wisconsin does not legally require a pre-suit demand letter for contract disputes, but circuit court judges expect to see that you tried to resolve things before filing. A demand letter also starts your paper trail.

Include in the letter:

• Your name and the contractor's full legal name
• The project address and dates
• What was agreed (attach a copy of the contract or written estimate)
• What went wrong (unfinished work, defective work, no-show)
• The exact dollar amount you are demanding
• A deadline to respond (14 to 30 days is standard)

Send it by certified mail or USPS first-class with a certificate of mailing. Keep the receipt — it becomes an exhibit.

Filing the Case

Complete Form SC-500 (Summons and Complaint). Check "Money Judgment" and write a brief factual statement: when you hired the contractor, what was promised, what was paid, and what was not delivered. Attach the contract and any invoices.

File at the Clerk of Circuit Court in the county where the work was performed (venue under Wis. Stat. § 799.11). Filing costs roughly $94.50 total ($22 base fee + $51 court support surcharge + $21.50 JINFO fee), plus service fees.

Serve the contractor — or their registered agent — at least 8 business days before the return date. If the contractor is an LLC, serve the DFI-registered agent by name and address.

Building Your Evidence

Contractor disputes live and die on documentation. Organize three copies of each exhibit:

• The contract or written estimate — even a text message agreeing to the scope and price counts
• Proof of payment — cancelled checks, bank transfers, Venmo/Zelle receipts
• Photos of the unfinished or defective work — timestamped, taken from multiple angles
• An independent repair estimate — get a written quote from another contractor for what it will cost to fix or complete the work
• All communication — texts, emails, voicemails where you tried to resolve the dispute
• Your demand letter and proof of mailing
• DATCP complaint records if you filed one

The independent repair estimate is often the most persuasive exhibit. It gives the commissioner a concrete dollar figure for damages rather than your own assessment.

What to Expect at the Hearing

Wisconsin small claims hearings use relaxed evidence rules (Wis. Stat. § 799.209), which means the commissioner can consider documents and photographs that might be excluded in a formal civil trial. Present your case in chronological order: the agreement, what you paid, what happened (or did not happen), your attempts to resolve it, and the cost to fix.

If the contractor does not show up, you can move for a default judgment. If they do show up and dispute the claim, the commissioner schedules a pretrial conference or trial.

The full filing process — from the demand letter through forms, fees, service, and the hearing — is covered step by step in the Wisconsin Small Claims Filing Guide.

See more Wisconsin guides →