Why is my wheelchair ramp too steep?
Usually because the ramp is too short for the height it climbs. The federal accessibility standard allows a running slope of no more than 1:12, which is 1 inch of rise for every 12 inches of ramp, and Virginia's Livable Home Tax Credit guidelines use the same 1:12 figure. Measure the rise and the length, divide, and compare. A steeper ramp needs more length, not a tweak.
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By Kasra Taheri, Founder, LoclisPublished
Researched and drafted with AI, then checked claim by claim against the sources listed below before it was published. Prices and rules change; the dates beside each source say when it was last checked.
Step by step
Read when to stop and call a pro, further down this page, before you start.
Step 1: Measure the rise
Measure straight up from the ground at the bottom of the ramp to the top of the door threshold or landing, in inches.
Step 2: Measure the run
Measure the length of the ramp along the ground, horizontally, from the foot of the ramp to the point under the top landing, in inches.
Step 3: Divide run by rise
Divide the run by the rise. A result of 12 or more means a slope of 1:12 or gentler; a smaller number means the ramp is steeper than the federal limit.[1]
Step 4: Check the sideways tilt
Lay a level across the ramp. The surface should not tilt sideways by more than 1 inch in 48.[1]
Step 5: Check the landings
Measure the flat landing at the top and bottom of each run; the federal standard asks for at least 60 inches of length.[1]
Step 6: Check width and handrails
Measure the clear width, which should be at least 36 inches, and note whether a ramp that rises more than 6 inches has handrails 34 to 38 inches high.[1]
Step 7: Check the edges
Look for a curb or barrier along each side so a wheel or crutch tip cannot slide off the edge.[1]
Step 8: Ask your building office
Call your locality's building office before changing a ramp, and ask whether the work needs a permit.[3]
Step 9: Get written quotes for a longer ramp
Ask licensed contractors to quote a longer or re-routed ramp, and a platform lift if there is no room.
Start with the arithmetic
A ramp is too steep when it is too short for the height it climbs. The federal accessibility standard puts it plainly: "Ramp runs shall have a running slope not steeper than 1:12."[1] That means 1 inch of rise for every 12 inches of ramp, so a 24-inch rise needs 24 feet of ramp before you count landings.
That standard is written for public buildings: it applies to places of public accommodation, commercial facilities, and state and local government facilities.[1] Virginia's Livable Home Tax Credit guidelines use the same figure for homes, describing an accessible route to a zero-step entrance as one on a firm surface no steeper than 1:12 from a driveway or public sidewalk.[2]
Measure your ramp
Measure the rise in inches, then the horizontal length in inches, and divide the length by the rise. Twelve or more meets the 1:12 limit. Nine means the ramp is about 1:9, which is steeper than the limit.
Measure the length along the ground, not along the sloping surface. A tape laid on the ramp itself reads a little long and flatters the result.
What the standard allows when space is short
The ADA standard has one exception for existing buildings where space limits the ramp. A slope steeper than 1:12 but not steeper than 1:10 is allowed only for a rise of up to 6 inches, and a slope steeper than 1:10 but not steeper than 1:8 only for a rise of up to 3 inches.[1] Anything steeper than 1:8 is prohibited.[1] So a ramp that climbs 18 inches at 1:8 has no path to compliance except being made longer or replaced.
Other things that make a ramp feel steep
A ramp that passes on slope can still be hard to use. Check these:
- Sideways tilt. The cross slope of a ramp run may not be steeper than 1:48, about 1 inch in 48.[1]
- Landings. Each ramp run needs a landing at the top and the bottom, at least 60 inches long.[1] A ramp that turns needs a clear 60 by 60 inch landing at the turn.[1]
- Run length. A single ramp run may rise 30 inches at most, so a taller climb needs a landing partway up.[1]
- Width. The clear width of a run, or between handrails where they are provided, must be at least 36 inches.[1]
- Handrails. A run that rises more than 6 inches needs handrails, with the top of the gripping surface 34 to 38 inches above the ramp surface.[1]
- Edges. The standard requires edge protection on each side of ramp runs and landings, so a wheel or crutch tip cannot leave the surface.[1]
How a too-steep ramp gets fixed
There is rarely a small adjustment. The fixes are structural: lengthen the ramp, fold it back on itself with a landing at each turn, move it to an entrance with less rise, or raise the ground at the foot of the ramp. Where there truly is no room, a platform lift is a recognized alternative: the ADA standard permits platform lifts where existing exterior site constraints make a ramp or elevator infeasible.[1]
Each option changes framing, footings or the ground around the house, so ask for written quotes that show the finished slope, the total length, the landing sizes and the handrail heights. Compare those numbers to your own measurements.
Permits and money
Rules differ by locality. Prince William County lists temporary ramps, permanent ramps, grab bars, widened doorways and wheelchair lifts among accessibility upgrades that always need a permit, and separately lists temporary ramps serving an entrance no more than 30 inches above grade among work that does not.[3] The Virginia building code exempts temporary ramps serving dwelling units in Groups R-3 and R-5 where the entrance is no more than 30 inches above grade, though the exemption does not excuse the work from other applicable requirements.[4] Call your own building office first.
For a sense of what the work costs and what help exists, see how much it costs to make a home wheelchair accessible in Virginia.
Stop and call a pro if
- The ramp is steeper than 1:12 and the fix means new framing, footings or a longer structure. Hire a licensed contractor and ask the building office about a permit.
- The ramp is wobbly, rotted, or its handrails move. A ramp that cannot hold a loaded wheelchair needs repair, not a slope check.
- Someone has already had a fall or a runaway on it. Stop using it until it is fixed and arrange another way in.
- There is no room for a long enough ramp. Ask a contractor about a switchback layout, another entrance or a platform lift.
- The ramp serves a rental, an HOA property or a historic house. The owner or board may have its own rules.
Getting help in Virginia
To make the bathroom safer too, read how to make a bathroom safer for an elderly parent and how to age in place. Browse more remodeling answers or accessibility remodeling businesses.
When you are ready, describe the job on Loclis and licensed local contractors will quote it.
Common questions
- What slope should a wheelchair ramp have?
- No steeper than 1:12, meaning 1 inch of rise for every 12 inches of ramp length. That is the running slope in the federal ADA standard, and Virginia's Livable Home Tax Credit guidelines use the same 1:12 figure for an accessible route to a zero-step entrance. A gentler slope is easier on the person using it and on whoever pushes.
- Does the ADA apply to a ramp at my house?
- Not directly. The ADA accessibility standards apply to places of public accommodation, commercial facilities, and state and local government facilities. Virginia's Livable Home Tax Credit guidelines use the same 1:12 figure for a zero-step entrance, so it is the sensible target for a home ramp.
- Can an existing ramp be steeper than 1:12?
- Only under the ADA standard's allowance for existing buildings where space is limited: slopes steeper than 1:12 up to 1:10 are allowed for a rise of no more than 6 inches, and slopes steeper than 1:10 up to 1:8 for a rise of no more than 3 inches. Anything steeper than 1:8 is prohibited. It is a last resort, and it is written for public buildings.
- How long does a ramp need to be?
- At 1:12 you need 12 inches of length for each inch of rise, so a 24-inch step up needs about 24 feet of ramp, plus landings. The standard limits any single run to 30 inches of rise, and a ramp that changes direction needs a clear 60 by 60 inch landing at the turn.
- What if there is no room for a long enough ramp?
- Options are to fold the ramp back on itself with a landing at each turn, to move the ramp to a side or rear entrance with less rise, or to use a platform lift. The ADA standard permits platform lifts where existing site constraints make a ramp or elevator infeasible. Ask for written quotes on each.
- Do I need a permit to rebuild a ramp?
- It depends on your locality. Prince William County lists temporary and permanent ramps among the accessibility upgrades that always need a permit, and also lists temporary ramps serving an entrance no more than 30 inches above grade among work that does not. The state building code exempts temporary ramps serving dwelling units in Groups R-3 and R-5 where the entrance is no more than 30 inches above grade. Call your own building office before you start.
Sources
- [1] ADA Accessibility Standards (2010), sections 405 and 505, U.S. Access Board. Checked October 27, 2026.
- [2] Livable Home Tax Credit Program Guidelines and Application, Tax Year 2026, Virginia Department of Housing and Community Development. Checked October 27, 2026.
- [3] Do I Need a Permit?, Prince William County Building Development Division. Checked October 27, 2026.
- [4] 13VAC5-63-80. Section 108 Application for permit (Uniform Statewide Building Code), Virginia Department of Housing and Community Development (Virginia Administrative Code). Checked October 27, 2026.
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