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What does Wisconsin rule ATCP 110 ban home improvement contractors from doing?

It bans a list of sales, pricing and payment practices. Wisconsin's ATCP 110.02 says no seller shall engage in the unfair methods of competition or unfair trade practices it lists, under headings from model home representations and bait selling to price and financing and misappropriation of buyer's prepayments. Key items are quoted below.

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

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By InstaBids editorial team with AI research agents. Sources read: 22 October 2026 Updated 2026-10-22

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Key facts

Which jobs and agreements does ATCP 110 reach?

Oral deals as well as written ones. ATCP 110.01(4) defines a home improvement contract as an oral or written agreement between a seller and an owner, and the full definition, quoted below, also names tenants and lessees. A separate line in 110.01(2), also quoted below, says home improvement does not include the construction of a new residence or the major renovation of an existing structure, a term 110.01(2m) defines.

Source: Wis. Admin. Code ch. ATCP 110, Home Improvement Practices, Wisconsin Legislature, read 22 October 2026.

Wis. Admin. Code ATCP 110.01(4), on the Wisconsin Legislature's site, read 22 October 2026: "“Home improvement contract” means an oral or written agreement between a seller and an owner, or a seller and a tenant or lessee, of residential or non-commercial property, or a seller and a tenant or lessee if the tenant or lessee is to be obligated for the payment of home improvements made in, to, or upon such property, and includes all agreements under which the seller is to perform labor or render services for home improvements, or furnish materials in connection therewith."

Source: Wis. Admin. Code ch. ATCP 110, Home Improvement Practices, Wisconsin Legislature, read 22 October 2026.

The last sentence of the definition of home improvement in ATCP 110.01(2): "“Home improvement” does not include the construction of a new residence or the major renovation of an existing structure."

Source: Wis. Admin. Code ch. ATCP 110, Home Improvement Practices, Wisconsin Legislature, read 22 October 2026.

ATCP 110.01(2m): "“Major renovation of an existing structure” means a renovation or reconstruction contract where the total price of the contract is more than the assessed value of the existing structure at the time the contract is initiated."

Source: Wis. Admin. Code ch. ATCP 110, Home Improvement Practices, Wisconsin Legislature, read 22 October 2026.

Wisconsin's Department of Agriculture, Trade and Consumer Protection (DATCP), in its home improvement tips page read 22 October 2026, opens with: "Wisconsin’s home improvement law, Wis. Adm. Code ch. ATCP 110, protects consumers contracting for improvements including:" Four of the items on its list are "basements", "driveways", "landscaping" and "air conditioning".

Source: Wisconsin DATCP, Home Improvement Consumer Tips, read 22 October 2026.

Which sales tactics does ATCP 110.02 forbid?

Misleading pitches come first. Items (1), (3), (4)(a), (5), (6)(a), (7)(a) and (9)(c) of ATCP 110.02 deal with model-home offers, bait selling, entry under the guise of an inspection, gift offers, special prices, pressure tactics and claims that something in your home is dangerous or defective; each one is quoted below.

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

ATCP 110.02, read 22 October 2026, opens: "No seller shall engage in the following unfair methods of competition or unfair trade practices:"

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

Items from that list, in its own words:

  1. 110.02(1): "Misrepresent or falsely state to a prospective buyer that the buyer’s residential or non-commercial property is to serve as a “model” or “advertising job”, or use any other prospective buyer lure to mislead the buyer into believing that a price reduction or other compensation will be received by reason of such representations."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  2. 110.02(3)(a): "Offer or represent specific products or materials as being for sale, where the purpose or effect of the offer or representation is not to sell as represented but to bait or entice the buyer into the purchase of other or higher priced substitute products or materials."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  3. 110.02(3)(f): "Misrepresent that certain products or materials are unavailable or that there will be a long delay in their manufacture, delivery, service, or installation in order to induce a buyer to purchase other or higher priced substitute products or materials from the seller."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  4. 110.02(4)(a): "Deceptively gain entry into the prospective buyer’s home or onto the buyer’s property under the guise of any governmental or public utility inspection, or otherwise misrepresent that the seller has any official right, duty, or authority to conduct an inspection."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  5. 110.02(5): "Offer or advertise any gift, free item, or bonus without fully disclosing the terms or conditions of the offer, including expiration date of the offer and when the gift, free item, or bonus will be given, or fail to comply with the terms of such offer."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  6. 110.02(6)(a): "Misrepresent to a prospective buyer that an introductory, confidential, close-out, going out of business, factory, wholesale, or any other special price or discount is being given, or that any other concession is made because of materials left over from another job, a market survey, or test, or any other reason."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  7. 110.02(7)(a): "Deliver materials, begin work, or use any other tactic to pressure the buyer into a home improvement contract, or make any claim or assertion that a binding contract has been agreed upon where no final agreement or understanding exists."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  8. 110.02(9)(c): "Misrepresent that the customer’s present equipment, material, product, home, or a part thereof, is dangerous or defective, or in need of repair or replacement."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

The list ends with a catch-all, 110.02(11): "Make any false, deceptive, or misleading representation in order to induce any person to enter into a home improvement contract, to obtain or keep any payment under a home improvement contract, or to delay performance under a home improvement contract."

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

What does the rule bar on prices, credit and payments?

Undisclosed costs, misleading credit dealings and misuse of your prepayments. ATCP 110.02(6) is headed price and financing, and its items (6)(e) to (6)(k) and (6)(n), with items (7)(b) and (10) and section 110.023(1), deal with final payment, undisclosed costs, financing, lien waiver notice, prepayments and swapped materials; each is quoted below.

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

ATCP 110.02(6)(e), read 22 October 2026: "Request the buyer to sign a completion slip or certificate, or make final payment on the contract before the home improvement is completed in accordance with the terms of the contract."

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

On costs the buyer is not told about, in the rule's own words:

  1. 110.02(6)(f): "Fail to disclose that the offered or contract price does not include delivery or installation, or that other requirements must be fulfilled by the buyer as a condition to the performance of labor, services, or the furnishing of products or materials at the offered or contract price."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  2. 110.02(6)(g): "Misrepresent that the down payment or any other sum constitutes the full amount the buyer will be obligated to pay."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  3. 110.02(6)(h): "Misrepresent or fail to disclose to a buyer, before the buyer enters into a home improvement contract, the existence or amount of any financing charges, interest service charges, credit investigation costs, building or installation permit fees, or other costs or charges to be paid by the buyer."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

On financing:

  1. 110.02(6)(i): "Fail to disclose that the home improvement contract, promissory note, or other evidence of indebtedness may be assigned or sold to a financial institution or any other third party."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  2. 110.02(6)(j): "Advise or induce the buyer to inflate the value of the buyer’s property or assets, or to misrepresent or falsify the buyer’s true financial position in order to obtain credit."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

  3. 110.02(6)(k): "Increase or falsify the contract price, or induce the buyer by any means to misrepresent or falsify the contract price or value of the home improvement for financing purposes or to obtain additional credit."

    Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

ATCP 110.02(6)(n): "Fail to provide notice to a buyer as required under s. ATCP 110.025 (1), before the buyer enters into a home improvement contract, that the buyer is entitled to receive written lien waivers."

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

ATCP 110.02(7)(b): "Solicit or accept any payment for home improvement materials or services which the seller does not intend to provide according to the terms of the home improvement contract, or which the seller has reason to believe will not be provided according to the terms of the contract."

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

ATCP 110.02(10), headed "Misappropriation of buyer’s prepayments.": "Use any home improvement contract payment, received from a buyer prior to the completion of a home improvement, for any purpose other than to provide materials or services for the home improvement."

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

The next section, ATCP 110.023(1), opens: "No seller may substitute products or materials for those specified in the home improvement contract, or for those which the seller represented would be used in the home improvement, without the prior consent of the buyer."

Source: Wis. Admin. Code s. ATCP 110.02, Prohibited trade practices (with s. ATCP 110.023), Wisconsin Legislature, read 22 October 2026.

What happens when a contractor breaks the rule?

The chapter's own note answers this. It says violations of this chapter may be prosecuted, and that a person who suffers a monetary loss because of a violation of this chapter may sue the violator directly; the note's words, including what can be recovered, are quoted below.

Source: Wis. Admin. Code ch. ATCP 110, Home Improvement Practices, Wisconsin Legislature, read 22 October 2026.

The Note to Wis. Admin. Code ch. ATCP 110, read 22 October 2026: "Violations of this chapter may be prosecuted under s. 100.20 (6), 100.26 (3) or (6), Stats. A person who suffers a monetary loss because of a violation of this chapter may sue the violator directly under s. 100.20 (5), Stats., and may recover twice the amount of the loss, together with costs and reasonable attorneys’ fees."

Source: Wis. Admin. Code ch. ATCP 110, Home Improvement Practices, Wisconsin Legislature, read 22 October 2026.

DATCP's home improvement tips page, read the same day, carries a link labelled "FILE A COMPLAINT" in its Take Action box.

Source: Wisconsin DATCP, Home Improvement Consumer Tips, read 22 October 2026.

In our reading, the note describes what the law allows; it does not say how any one dispute will turn out. Ask a lawyer how it applies to your job.

How can you use the list before you sign?

Treat each banned practice as a question to ask before you agree to anything, get the answers in writing, and hold the last payment until the job matches the contract. This is practical reasoning, not legal advice and not a finding from any agency.

  1. Ask for the price in writing with what it includes, such as delivery, installation, permits and any financing charges, so a missing item shows up before you sign.
  2. If a salesperson says your home will be a showcase job, or that a special price ends today, slow down and compare written bids on the same scope.
  3. DATCP's tips, in the list for when transient workers come to your door: "Do not give into high pressure tactics."

    Source: Wisconsin DATCP, Home Improvement Consumer Tips, read 22 October 2026.

  4. DATCP's tips, in the section on contracts: "Never sign a completion certificate or make final payment until you are satisfied and all work is done as specified."

    Source: Wisconsin DATCP, Home Improvement Consumer Tips, read 22 October 2026.

  5. Ask for written lien waivers when you pay, and keep them with the contract.
  6. If the materials on site differ from the ones named in your contract, ask about it before work goes on, and put any change you agree to in writing.
  7. Keep the contract, receipts, written promises and the dates of each payment together in one place.

Who sees your contact details when you post on InstaBids?

Contact details stay hidden until the homeowner picks a contractor and they confirm the connection.

Source: InstaBids process and privacy, live-page excerpts, read 22 October 2026.

Post your job on InstaBids, and contractors can bid in writing on one written scope.

Homeowners anywhere in the US can post a job; once you send it, InstaBids finds contractors to bid on it.

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