Residential wheelchair ramp code
The ADA does not cover your house. Here is what does: the residential building code, how loose it is compared with the ADA, and when a ramp needs a permit.
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There is no single national code for a wheelchair ramp at a house. The ADA does not apply to private homes. What does apply is your state or local building code, and in most of the country that code is based on the International Residential Code, the IRC. Its ramp rules are short, and in places looser than people expect.
| Requirement | IRC rule | Section |
|---|---|---|
| Slope, ramp to the required exit door | No steeper than 1:12 (8.3 percent) | R311.8.1 |
| Slope, any other ramp | No steeper than 1:8 (12.5 percent) | R311.8.1 |
| Where 1:12 will not fit | 1:8 allowed if site constraints make 1:12 technically infeasible | R311.8.1 |
| Landings | Top and bottom, where a door opens onto the ramp, and at every turn; at least 36 inches deep and as wide as the ramp | R311.8.2 |
| Handrails | At least one side, on any ramp steeper than 1:12 | R311.8.3 |
| Handrail height | 34 to 38 inches above the ramp surface, continuous for the full length | R311.8.3.1, R311.8.3.3 |
| Guards | Where the open side is more than 30 inches above the ground below | R312.1.1 |
| Width | No minimum set for ramps | None |
Section numbers are from the 2021 IRC. The 2018 edition has the same ramp rules. The 2024 edition keeps them but moves them to Section R318.8, so a building department on the newest code will quote different numbers for the same requirements.
IRC and ADA side by side
The two codes differ more than most guides admit. A ramp built to the IRC minimum can be legal at a house and still be hard to use in a wheelchair.
| IRC, homes | ADA, public buildings | |
|---|---|---|
| Maximum slope | 1:12 to the required exit, otherwise 1:8 | 1:12 |
| Rise before a landing | No limit | 30 inches |
| Width | No minimum | 36 inches clear |
| Landing depth | 36 inches | 60 inches; 60 by 60 at a turn |
| Handrails | One side, only if steeper than 1:12 | Both sides, on any run rising more than 6 inches |
| Edge protection | Guards above 30 inches | Curb or barrier on every run |
The full ADA list, with section numbers, is in our ADA ramp requirements guide.
Build to the ADA numbers anyway
A 1:8 ramp is legal on many houses and almost impossible to climb alone in a manual wheelchair. A 36 inch landing is too short to stop and open a door from a chair. The ADA figures exist because they are what most wheelchair users can manage without help, and that is the point of a ramp at home.
So treat the IRC as the floor and design to the ADA: 1:12 or gentler, 36 inches clear between handrails, handrails on both sides, and 60 inch landings. The ramp calculator works out the length and landings for your rise on that basis.
Do you need a permit?
Usually, for a permanent ramp. The IRC lists the work that is exempt from a permit, and ramps are not on the list. The closest exemption is for small decks, and it excludes any deck that is attached to the house or serves the required exit door, which a ramp almost always does.
Local rules vary, which is why it pays to ask before building. Two examples:
- York County, Virginia requires a building permit for a ramp, with plans and a site plan showing setbacks, and charges a $90 plan review fee. It waives the permit for a temporary ramp at a house where the entrance is less than 30 inches above grade.
- New Castle County, Delaware requires a permit for every exterior ramp and none for a temporary interior one. It also asks for a 36 inch clear width, a rule the IRC itself does not have.
Portable ramps that are not fixed to the house generally need no permit. Modular aluminum ramps sit in between: some towns treat them as temporary, others want a permit because of the landing at the door. Most installers handle the permit as part of the job; ask whether it is in the quote.
Setbacks, zoning and HOAs
A long ramp at the front of a house can run into a zoning setback, the minimum distance a structure must keep from the property line. Many cities have a variance or a specific allowance for accessibility ramps. Where they do not, federal fair housing law still applies: the Justice Department and HUD have stated that it is unlawful for local governments to refuse reasonable accommodations in zoning rules where these are needed for a person with a disability to use their home, and that waiving a setback for an accessible path can be one.
The same law covers renters. A landlord has to allow reasonable modifications such as a ramp, at the tenant's expense, and may ask for the property to be restored when the tenant leaves. Homeowner associations are also covered by the Fair Housing Act, so a flat refusal to allow a ramp is worth challenging.
Before you build
- Call your building department and ask which code edition they use, whether a ramp needs a permit, and whether they have local amendments for ramps.
- Check setbacks if the ramp heads toward the street or a side lot line.
- Measure the rise, then plan the ramp at 1:12 or gentler with the calculator.
- Get prices from what a ramp costs, and look for installers in the directory.
- Check grants and funding programs before paying yourself.
IRC text is from the International Code Council's published 2021 IRC, Chapter 3 (opens in a new tab) (Sections R311.8 and R312.1.1) and Chapter 1 (opens in a new tab) (Section R105.2, work exempt from permit), checked against the 2018 and 2024 editions. Local examples are from York County, Virginia (opens in a new tab) and New Castle County, Delaware (opens in a new tab). Fair housing guidance is from the Justice Department and HUD joint statement (opens in a new tab). This is general information, not legal advice; your local code and building official have the final word. Checked October 2026.