Not every doorway that stops a wheelchair or walker needs to be torn open and reframed. Sometimes the door is wide enough, but a raised threshold – the strip of wood, metal, or vinyl running along the bottom of the frame – is the actual obstacle. Confusing the two problems leads to either an unnecessary remodel or a ramp that never should have been the fix in the first place. Here is how to tell which one you have, and what a threshold ramp can and cannot solve.
What a Threshold Actually Is, and Why It Trips Up Wheelchairs
A threshold is the raised strip at the base of a doorway, usually installed to seal out drafts, water, and pests at exterior doors, or to bridge a flooring transition at interior doors. For someone walking, a half-inch bump is barely noticeable. For a wheelchair caster, a walker leg, or a foot with limited clearance, that same half-inch can catch a wheel, tip a walker, or trigger a fall. Exterior doors tend to have the tallest thresholds because they need to shed water; older homes and older sliding-door tracks are frequent offenders.
The ADA Numbers That Define the Problem
The 2010 ADA Standards for Accessible Design set specific limits on threshold height, and they are a useful reference even in a private home that is not legally required to meet them. Thresholds at accessible doorways are capped at half an inch, with an exception for exterior sliding doors, which can run up to three-quarter inch. Existing thresholds that are being altered rather than replaced are allowed up to three-quarter inch as well, but only if they carry a beveled edge on both sides. Any threshold taller than a quarter inch needs that bevel, sloped no steeper than 1:2 – meaning two inches of horizontal run for every inch of vertical rise. Anything at or under a quarter inch needs no bevel at all. These numbers matter because they tell you exactly what a ramp needs to achieve: get the rise-to-run ratio gentle enough, and the crossing becomes safe, regardless of whether the threshold itself ever gets replaced.
When a Ramp Is the Right Call – and When It Isn’t
A threshold ramp only solves a vertical problem. It does nothing for a doorway that is too narrow. The rule of thumb worth checking first is doorway width: a clear opening of roughly 32 inches, measured with the door open to 90 degrees, is generally treated as the minimum for wheelchair passage, and many older interior doors fall well short of that. If your doorway already clears that width and the only obstacle is the bump at the bottom, a ramp is a legitimate, often permanent-enough solution – not a stopgap. If the doorway itself is narrow, a ramp will only get someone up to a frame they still cannot fit through, and widening becomes the real project.
| Situation | Threshold ramp | Widen the doorway |
|---|---|---|
| Doorway width is already sufficient, threshold is the only obstacle | Solves it | Unnecessary |
| Doorway is narrower than a wheelchair or walker needs | Does not solve it | Required |
| Renter or short-term living situation | Good fit – no structural change | Usually not worth it |
| Exterior door with a tall, code-driven threshold | Good fit if width is fine | Only if the frame itself is also too narrow |
The Common Ramp Types
Once a ramp is the right call, the choice mostly comes down to the height of the rise and how permanent the installation needs to be.
- Rubber ramps – the most common choice for smaller rises, generally up to around two and a half inches. They are heavy enough to stay in place without fasteners, provide a slip-resistant surface, and can be lifted out and moved if a household’s needs change. Many are made from recycled rubber.
- Aluminum ramps – typically used for rises up to about three inches. They are lighter than they look, rated for substantial weight loads, and often come as a single textured plate that sets directly over the threshold without modifying it.
- Adjustable or modular ramps – built to handle a wider range of single-step rises, in some cases up to nine inches, by combining sections or adjusting the incline. These are the option to reach for when a threshold sits unusually high and a simple wedge ramp would end up too steep to meet the 1:2 slope guideline.
Portable versions of any of these – sometimes called suitcase ramps – fold for storage and travel, which matters for a household visiting family or managing a temporary recovery period rather than a permanent condition.
How to Decide Before You Call a Contractor
Measure twice before assuming either fix is the answer. Check the clear doorway width with the door fully open, then measure the threshold height at its tallest point. If the width clears roughly 32 inches and the threshold is the only issue, a ramp sized to the correct slope ratio is very likely all that doorway needs – a same-day fix rather than a remodel. If the frame itself is narrow, a ramp becomes a partial measure at best, and the conversation shifts to what widening the opening actually involves, including whether the wall is load-bearing and what it takes to reframe it. A licensed contractor who specializes in home accessibility modifications can confirm the measurement and the right ramp slope in a single visit, which is a far smaller commitment than starting a remodel that the threshold alone never required.