Under the codes for new stairs in Minnesota and Wisconsin homes, any flight with four or more risers needs a handrail on at least one side, indoors or out. Minnesota sets the height at 34 to 38 inches above the tread nosings, Wisconsin at 30 to 38. The rail must be graspable and run the full length of the flight.
When stairs need a handrail
A handrail is the thing you grab when a foot slips, which is why both states require one on any new flight of stairs.
Minnesota uses the Minnesota Residential Code, which adopts the 2018 International Residential Code with state amendments (Minn. R. 1309.0010). Minnesota doesn't amend the handrail section, so the IRC text applies: handrails on not less than one side of each flight of stairs with four or more risers (Minnesota Residential Code (2018 IRC as adopted), R311.7.8), a rule the state's own porch handout repeats (Minnesota DLI). Duluth's deck page puts it plainly: handrails on at least one side of stairways, with a grippable size and shape (City of Duluth).
Wisconsin uses the Uniform Dwelling Code. A flight with more than three risers gets at least one handrail for its full length (Wis. Admin. Code SPS 321.04). Three risers or fewer, and neither state's code requires a rail.
One Superior wrinkle: the UDC doesn't apply to homes whose construction began before the code took effect, to additions or alterations to those homes, or to repairs (SPS 320.05). If your house is older than the code, ask Superior's building inspection office which rules apply before rebuilding the stair. The Minnesota figures here are also the rules for new stairs; ask Duluth Construction Services what applies to an older one.
| Rule | Minnesota | Wisconsin |
|---|---|---|
| When a handrail is required | Each flight with four or more risers, on at least one side | Each flight with more than three risers, at least one rail |
| Handrail height | 34 to 38 in, measured from the line of the tread nosings | 30 to 38 in above the nosings, measured from the structural surface under the finish |
| Grip | Round 1¼ to 2 in across, or another shape with a 4 to 6¼ in perimeter; larger rails need a finger recess | Symmetrical; round no more than 2 in across; rectangular no more than 6¼ in around |
| Space from the wall | At least 1½ in | At least 1½ in |
| Continuity | Full length of the flight; may break at a landing, over the bottom tread or at a newel post on a winder turn | Full length; may break at an intermediate landing, at newel posts or at a short offset at a wall |
| Guards needed | Open sides more than 30 in above the floor or grade | Open sides more than 24 in above grade or floor, and open sides of stairs with more than three risers |
| Guard height and openings | 36 in (34 in along stairs); no 4 in sphere through, 4⅜ in on stair sides | 36 in, or up to the stair handrail; no 4⅜ in sphere through |
Handrail height, grip size and wall clearance
Height. Minnesota measures vertically from the sloped line that runs along the tread nosings, and the top of the rail must land between 34 and 38 inches (R311.7.8.1). Wisconsin allows 30 to 38 inches above the nosings, measured from the hard surface under any carpet or finish.
Grip. Graspable means your fingers can wrap around it. Minnesota's Department of Labor and Industry summarizes the rule: a round rail between 1¼ and 2 inches across, or a non-round rail with a perimeter of 4 to 6¼ inches and no dimension over 2¼ inches; bigger decorative profiles need a finger recess on both sides (Minnesota DLI). Wisconsin requires a symmetrical shape, round rails no more than 2 inches across, and rectangular rails no more than 6¼ inches around. A flat 2x6 laid on top of balusters meets neither state's grip rule, which is why deck stairs often get a separate grab rail mounted to the posts.
Clearance and projection. Both codes want at least 1½ inches between the rail and the wall, and both limit how far a rail sticks into the stair to 4½ inches on each side.
Continuous rails, landings and guards
Within a flight, yes. Minnesota's rule is that the rail runs the full length of the flight, from a point directly above the top riser to a point directly above the lowest riser, with the ends returned to the wall or finished into newel posts or safety terminals so a sleeve can't catch on them (R311.7.8.4). The code lets a newel post interrupt the rail at a landing, at a turn in a flight with winders, or over the lowest tread.
Wisconsin is similar: continuous for the entire length, except that it may break at an intermediate landing, have newel posts, or stop at an intermediate wall when the two rails are offset no more than 12 inches and you can reach both from the same tread without taking a step.
Guards are a separate rule. A guard keeps you from falling off an open side. Minnesota requires guards where the open side is more than 30 inches above the floor or grade below, 36 inches tall (34 inches along the stairs), with no opening a 4-inch sphere can pass through, or 4⅜ inches along stair sides (R312.1). Wisconsin triggers guards at 24 inches, requires 36 inches or the underside of the stair handrail, and uses a 4⅜-inch sphere.
Installing a handrail that actually holds
Wisconsin requires new handrails and guards to withstand a 200-pound load applied in any direction, and that only happens when brackets screw into studs or solid blocking, not drywall or plaster alone.
- Find the framing first. In Duluth's older plaster homes, studs can be irregularly spaced and the plaster is thick, so locate each one before marking brackets. Our guide to mounting on plaster walls covers finding studs through plaster.
- Snap the nosing line. Measure the height up from a string run along the tread nosings, at the top and the bottom.
- Outside, pick materials that last. Wisconsin requires exterior rails of metal, decay-resistant or treated wood, or protection from the weather.
Our safety and mobility work covers handrails and grab bars, and carpentry covers rebuilt stairs, newel posts and balusters. The Duluth and Superior permit guide explains when stair and deck work needs a permit.
Does a single step need a handrail?
Not under either state's code. Minnesota requires a handrail on flights with four or more risers and Wisconsin on more than three, so a single step or a two-step stoop needs none. It's still worth adding where the step ices over or someone is unsteady, since a short rail anchored into framing is a small job.
Which side of the stairs should the handrail go on?
Either side meets the code in most cases. Minnesota requires a rail on at least one side of the flight and doesn't say which. Wisconsin adds one rule for winder stairs: the rail goes on the side where the treads are wider, unless every winder is at least 9 inches deep measured 12 inches from its narrow end.
Otherwise, put it where there is solid framing and where the person who needs it most has their stronger hand going down.
Can a handrail stop at a landing?
Yes, in both states. Minnesota's rule runs the rail the full length of each flight, from above its top riser to above its lowest riser, and lets a newel post interrupt it at a landing. Wisconsin allows a handrail to be discontinuous at an intermediate landing.
Each flight still needs its own rail, and the rail ends should be returned to the wall or finished into a newel post so nothing catches on them.
What is the best handrail shape for indoor stairs?
A round or oval rail you can fully wrap your hand around. In Minnesota, a round rail between 1¼ and 2 inches across meets the grip rule without any calculation, and in Wisconsin a round rail of 2 inches or less does too. Wide decorative profiles need a finger recess in Minnesota, and flat boards fail in both states.
Send photos of the stair from the top and bottom and say which side you want the rail on. Call or text (715) 919-7956, or request a handrail quote online. Every handrail gets a flat written quote you approve before work starts.
Next steps. Our safety and mobility upgrades page covers the work itself, and How Much Does Grab Bar Installation Cost in Duluth, MN? covers the money. Serving Duluth, Superior and beyond.
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