Wisconsin pier permit rules and when you need a DNR permit

Wisconsin pier permit rules come down to one question: does your pier meet the state's exempt-pier standards, or not? If it does, you can put it in without a DNR permit and without even contacting the DNR first. If it does not, you need a permit under Wis. Stat. 30.12. This guide breaks down the exempt standards, what triggers a permit, and the general rule against putting structures on the bed of a navigable lake.

What is an exempt pier in Wisconsin?

An exempt pier is one that meets the DNR's size, location, and slip standards, so it does not need an individual permit. According to the Wisconsin DNR Pier FAQ, a new pier is exempt if it meets the DNR pier planner standards and the eligibility criteria in the pier exemption checklist. If your pier is exempt, the DNR says you do not need to contact them before placement.

The core exempt standards are:

• Width: the pier, dock, or wharf may not exceed 6 feet in width. An "L," "T," or catwalk is allowed as part of the pier as long as no part of the walkway exceeds 6 feet wide.
• Loading platform: a loading platform (any area wider than 6 feet) is allowed only if its surface area is no more than 200 square feet.
• Boat slips: no more than 2 boat slips for the first 50 feet of your shoreline frontage, plus one additional slip for each additional full 50 feet of frontage.
• Boat lifts and shelters: an associated seasonal boat shelter, boat hoist, or boat lift is allowed if it meets the requirements of Wis. Admin. Code NR 326.

What is the boat slip formula?

The slip limit scales with how much shoreline you own. Per the DNR Pier FAQ, non-commercial owners get up to two slips for the first 50 feet of shoreline owned, and one for each additional full 50 feet. So 60 feet of frontage still gets two slips, 100 feet gets three, and 150 feet gets four. A "slip" is the berthing space between or alongside pier sections where you tie up a boat. On a shared pier or a shoreline with an unclear property line, that frontage measurement itself can be the hard part; see our shared piers and riparian rights guide for how Wisconsin handles those boundary questions.

When do you need a DNR permit?

You need a permit when your pier falls outside the exemption. Common triggers:

• A walkway wider than 6 feet, or a loading platform larger than 200 square feet.
• More boat slips than your shoreline frontage allows.
• A pier in an Area of Special Natural Resource Interest, or other sensitive water, where stricter rules apply.
• Any configuration the exemption checklist does not cover.

If any of those apply, you apply to the DNR for an individual permit under the process described on the DNR piers and recreational structures permitting page. The DNR reviews the configuration and, for slips, may not deny the permit based on slip count alone if the number stays within what the statute allows. Note that this DNR pier review is separate from Waukesha County's own shoreland zoning review, which covers land-side setbacks and structures near the water; see our county shoreland zoning guide for how the two overlap.

What does Wis. Stat. 30.12 actually say?

Wisconsin Statute 30.12 is the general rule that you cannot place a structure or deposit material on the bed of a navigable water without authorization. A "structure" here includes a pier, wharf, boat shelter, boat hoist, or boat lift. Placing one requires either that it qualify for an exemption or that you hold a permit. Violations carry a penalty; under Wis. Stat. 30.12 a person violating the section or a permit condition can be fined up to $1,000, imprisoned up to 6 months, or both.

There is also a grandfather provision. A pier or wharf placed on the bed of a navigable water before April 17, 2012 is generally exempt from the permit requirement, unless the DNR notified the owner before August 1, 2012 that the structure was detrimental to the public interest. Repairs or replacement that do not change the existing footprint also stay exempt.

Where does NR 326 fit in?

Wis. Admin. Code NR 326 is the administrative rule that governs boat shelters, hoists, and lifts tied to a pier. When the exemption references a "seasonal boat shelter, boat hoist or boat lift that meets the requirements of NR 326," this is the rule setting those requirements. If you are adding a canopy or shelter over a lift, NR 326 is where the size and placement limits live, so it is worth reading before you buy a covered lift. Shoreline erosion control, a seawall or riprap, is a separate matter entirely, governed by Wis. Admin. Code NR 328 rather than NR 326. See our seawall and riprap cost guide for those permit tiers, or our seawall repair guide if you are dealing with existing damage rather than new construction.

Wisconsin exempt pier standards at a glance

Standard	Exempt limit	Triggers a permit
Pier width	6 feet or less	Wider than 6 feet
Loading platform	200 sq ft or less	Larger than 200 sq ft
Boat slips	2 for first 50 ft frontage, +1 per added 50 ft	More slips than frontage allows
Boat lift / shelter	Meets NR 326	Outside NR 326 limits
Location	Not in a sensitive or special-interest water	Area of Special Natural Resource Interest

Frequently asked questions

Do I have to tell the DNR before I put in an exempt pier? No. The DNR says if your pier is exempt, you do not need to contact them before placement. Keep documentation that shows it meets the standards.

Can my boat lift stay in the water year-round? Boat lifts and hoists can generally remain in place year-round, but many owners still remove or raise them to avoid ice damage. The lift itself must meet NR 326.

What if my pier was already there when I bought the property? A pier placed before April 17, 2012 is generally grandfathered unless the DNR flagged it before August 1, 2012. Repairs that keep the same footprint stay exempt.

Who decides if my exact pier is exempt? The Wisconsin DNR. This guide explains the standards, but only the DNR can make the call on your specific property. Start with the exemption checklist and pier planner on the DNR site.

Sources: Wisconsin DNR Pier FAQ, Wisconsin DNR pier permitting, and Wis. Stat. 30.12.