Different Floor Heights Between Rooms: How to Fix a Small Step

A small step between rooms is one of the most common things we see in older homes. The kitchen sits 3/4" above the dining room, or the new bathroom tile stands proud of the hallway. It looks off, and it is a real trip hazard. The fix depends on how big the difference is and why it's there.

Why are my floors two different heights?

• Layers of old flooring. Kitchens and baths often have two or three generations of vinyl, each with its own underlayment, while the next room has one floor. Every layer of 1/4" plywood adds up.
• Tile on backer board. Tile plus thinset plus cement board or a membrane can easily reach 3/4" or more. LVP next to it might be 1/4" or less.
• Different flooring thicknesses. Solid hardwood is commonly 3/4" thick. LVP is often around 4 to 8 mm (roughly 3/16" to 5/16"). Put them side by side and you get a step.
• Additions and renovations. An addition built on a different subfloor, or a room that got a new layer of plywood over old boards, can sit higher.
• Settling or sagging. Sometimes the subfloor itself has dropped. That is a structural question, not a flooring one, and it should be looked at before anything is covered up.

How do you measure the height difference between rooms?

1. Measure the finished floors. Lay a straight board or level across the doorway with one end on the higher floor. Measure from the bottom of the board down to the lower floor. Do it at both sides of the doorway and the middle.
2. Account for the new flooring. If you're replacing one side, subtract the old floor's thickness and add the new floor plus underlayment. A floor that matches today might be off after the swap.
3. Check what's underneath. Pull a floor register or look at the edge of the floor at a doorway. You can often count the layers.
4. Check flatness near the doorway. A step can hide a dip. LVP and laminate commonly need about 3/16" in 10 ft flatness (some products 1/8" in 6 ft).

Small step between rooms: fixes by size

These are general ranges. Check the profile chart for the specific reducer you are buying. Every manufacturer lists what height range each piece covers.

Option 1: Use a reducer

For most small steps, a reducer is the right answer. It slopes from the high floor down to the low one, protects the edge and gives your foot a ramp instead of a lip. Matching reducers are sold with most LVP and laminate lines. Hardwood reducers can be custom milled to fit. See flooring transitions between rooms for every type and where it goes in a doorway.

Option 2: Build up the lower floor

When the new floor is going in on the low side, you can raise it. Plywood underlayment in the right thickness (screwed down on a tight pattern) brings the subfloor up so the finished floors meet flush. This adds material and time, and it can affect door clearance, appliance heights and baseboards, but it gives the cleanest result. For more on prep, see what subfloor leveling is.

Option 3: Remove layers on the higher side

If the high floor has old vinyl or extra plywood stacked up, tearing out to the original subfloor often solves the problem completely. It is also the best time to check the subfloor for rot or soft spots. Read can LVP go over an existing floor before deciding to leave layers in place.

Old sheet vinyl, 9x9 tiles and black mastic in homes built before 1978 can contain asbestos. Do not sand, scrape or tear it out until it is tested. If it tests positive, have a certified pro handle it or encapsulate it.

Option 4: Feather or ramp with patching compound

On a moderate step, you can feather the subfloor on the low side with a cement-based patching or leveling compound. The patch tapers from the higher floor down over a foot or more, so the change becomes a gentle slope instead of a step. The new floor then follows that slope. This works under glue-down and many floating floors, as long as the slope stays within the flooring's flatness tolerance. A steep ramp will cause floating planks to gap or flex.

Two different floor heights and safety

A step of even 1/4" with a square edge can catch a toe, a walker or a cane. Small, unexpected changes are often more dangerous than a full stair, because people don't see them coming. Keep these in mind:

• Every change in height should have a beveled or sloped edge, never a square lip.
• Transitions must be firmly fastened. A loose reducer is worse than none.
• In homes with older adults, kids or anyone with mobility issues, aim for flush floors wherever you can.
• A contrasting transition color can help people see a step that has to stay.

What you'll need

• Straightedge or 4 ft level, tape measure
• Reducer or transition molding sized to the step
• Plywood underlayment and screws (for build-up)
• Cement-based patching or feathering compound, trowel and mixing paddle (for ramping)
• Pry bar, oscillating tool and floor scraper (for removal)
• Jamb saw, construction adhesive, drill
• Dust mask, eye protection and knee pads

How to fix uneven floor heights at a doorway

1. Measure the final height difference. Use the finished heights of both floors after the new flooring and any underlayment are in, not today's numbers.
2. Find out why. Count the layers, check for soft spots and look for sagging. If the floor has dropped, call a contractor before going further.
3. Choose the fix. Use the table above. Removing old layers and building up the low side both give flush floors. A reducer or ramp is faster.
4. Prep the subfloor. Screw down loose areas, remove debris and make sure the area is flat within your flooring's tolerance.
5. Build up or feather. Install plywood or trowel the patch, feathering it out in thin passes. Let it cure fully per the bag.
6. Install the flooring. Leave the gap the transition calls for at the doorway.
7. Install the transition. Center it under the closed door, fasten it to the fixed side or its track, and check door swing.

Common mistakes to avoid

• Measuring today's floors instead of the finished heights.
• Stretching a standard reducer over a step it wasn't designed for, leaving a lip.
• Making a patch ramp so steep that floating planks flex or gap.
• Covering up a sagging floor instead of fixing the cause.
• Tearing out old resilient flooring in an older home without testing it first.
• Forgetting door clearance and appliance heights after building up a floor.

When to hire a pro

A reducer at one doorway is a reasonable DIY job. Call a pro when the step is over 1/2", when old flooring layers need to come out, when a whole room needs to be built up, or when tile and LVP are being installed side by side and need to finish flush. Also call one if the floor feels soft or looks like it has dropped.

Need it done for you?

We check heights at every doorway during the estimate and plan the fix before install day. Book a free in-home estimate and you'll get a fixed-price quote within 48 hours.