In Arizona, routine yard maintenance such as mowing, weeding, and shrub and tree care needs no Registrar of Contractors (ROC) license, but installation work does. Installing irrigation, hardscape, pavers, walls or artificial turf, or any landscape job of $1,000 or more (or one that needs a permit), should be done by an ROC-licensed contractor, typically one holding an R-21 or CR-21 Hardscaping & Irrigation Systems license. Before you sign, ask for the company's ROC number and verify it at roc.az.gov. This is general information, not legal advice.
Who counts as a contractor in Arizona
Arizona defines "contractor" broadly. Under A.R.S. §32-1101, it covers anyone who, for pay, undertakes or "offers to undertake" construction work, "by himself or by or through others." Hardscape contractors are listed among the specialty trades. A.R.S. §32-1151 makes it unlawful to act as a contractor, or even to submit a bid, without a license unless an exemption applies.
The stakes are real for the person doing the work: under A.R.S. §32-1164, acting as a contractor without a license is a class 1 misdemeanor, with a minimum fine of $1,000 for a first offense. For you as the homeowner, the practical point is simpler. A licensed contractor is accountable to the ROC, and that is worth checking before work starts.
The gardener exemption: maintenance work
A.R.S. §32-1121(A)(16) exempts "a person who functions as a gardener by performing lawn, garden, shrub and tree maintenance." That covers most of what Tucson homeowners hire out week to week:
- lawn mowing and edging;
- weeding, raking and yard cleanups;
- routine shrub care and tree trimming.
The exemption does not name irrigation installation or hardscape. If a maintenance company also offers to build a patio or put in a new drip system, the ROC rules for that work apply.
The "minor work" exemption under $1,000
The same statute, §32-1121(A)(14), lets an unlicensed person do small jobs, but only when all of these are true:
- the total price for labor and materials is less than $1,000;
- the work is "of a casual or minor nature";
- no local building permit is required;
- the work is not part of a larger project, and is not split into several contracts under $1,000 to get around the law; and
- any advertising includes the words "not a licensed contractor."
If someone quotes a $3,000 backyard project as three separate $990 jobs, that is a warning sign. Some cases are less clear, such as a small drip repair done during a maintenance visit. When in doubt, ask the ROC.
Installation work: R-21 and CR-21 licenses
For landscape construction, the license class you will usually see is CR-21 Hardscaping and Irrigation Systems, a dual license that covers both the commercial C-21 and residential R-21 scopes under Arizona Administrative Code R4-9-104. Older "Landscaping and Irrigation Systems" licenses were reclassified into it. Projects where you should typically expect an ROC-licensed contractor include:
- new irrigation or drip systems;
- pavers, patios, retaining walls and other hardscape;
- artificial turf installation;
- gravel and desert landscaping installs of $1,000 or more.
Check that the license class on the ROC record fits the job you are hiring for.
The ROC number should be on the bid
Under A.R.S. §32-1124(B), licensees must show "ROC" and their license number on bids, published advertising and letterheads. Internet and broadcast ads may link to a page that shows the name and number instead. So a written bid without an ROC number for installation work is a reason to ask questions. Look the number up yourself at roc.az.gov rather than relying on a photo of a license card.
Weed control has its own license
Herbicides fall under the Arizona Department of Agriculture, not the ROC. A gardener doing maintenance may apply herbicides under an exemption in A.R.S. §3-3613, but it ends for pre-emergents or sterilants, for companies that advertise weed management, for crews of two or more, and above set daily amounts. For pre-emergent treatments, or any company that advertises weed control, ask for its Arizona Department of Agriculture Pest Management Division license and verify it. Exempt gardeners must give you treatment records. Our pre-emergent timing guide explains more.
Trees, palms and native plants
We found no Arizona state license for tree trimming. For tree work, ask about insurance and experience, and whether anyone on the crew holds ISA certification (a private credential you can check at isa-arbor.com). Palm trimming at height is specialized work; ask how the company does it safely. If a job means removing or moving a saguaro, palo verde or mesquite, read our guide to Arizona native plant law first.
Red flags worth a second look
None of these prove a problem on their own, but each is a reason to slow down and check the ROC record before you sign:
- an installation bid, such as a new drip system or paver patio, with no ROC number on it;
- one project broken into several invoices that each land just under $1,000;
- an ad offering installation work that also says "not a licensed contractor," which signals the person is limited to minor jobs;
- a company that offers pre-emergent treatments but can't give you a Pest Management Division license number.
A homeowner's verification checklist
- Is this maintenance (mowing, pruning, cleanup) or installation (irrigation, hardscape, turf)?
- For installation, or any job of $1,000 or more, what is the ROC number, and does it check out at roc.az.gov?
- Does the license class fit the work, typically R-21 or CR-21 for landscape construction?
- Is the ROC number printed on the written bid?
- Will the job need a permit, and who pulls it?
- For pre-emergent or advertised weed control, what is the Pest Management Division license?
- For tree and palm work, can you see proof of insurance?
- Is the scope, price and payment schedule in writing before work begins?
Getting quotes
Price ranges for common jobs, from mowing to turf installs, are on our Tucson landscaping prices page; they are typical ranges from published cost guides, not quotes. When you are ready, request free quotes. Tucson Lawn Care Pros is an independent quote service that connects Tucson-area homeowners with independent local companies; the company you choose quotes, contracts and does the work directly with you. Tucson Lawn Care Pros is not a licensed contractor and holds no Arizona Registrar of Contractors or Arizona Department of Agriculture license, so always verify the company you hire.