Home Modification Guide
Wheelchair Ramp Installation: DIY, Permits, and Contractor Tips
Installing a ramp the right way starts with a slope calculation. Get that wrong and the ramp is either too steep to use safely or too short to reach the ground. This guide covers everything from the math to the permits.
Last reviewed: May 2026
DIY vs. Hire a Contractor
| Ramp Type | DIY? | Notes |
|---|---|---|
| Portable folding ramp | Yes | No installation needed, unfold and use |
| Threshold ramp (under 6 in) | Yes | Place and secure, minimal skill needed |
| Permanent modular aluminum (prefab sections) | Possible | Can be a DIY weekend job, but permit and level ground required |
| Custom wood ramp built on-site | Hire a contractor | Structural framing, permit required, liability if it fails |
| Complex multi-section with landings | Hire a CAPS contractor | Grade, drainage, and ADA compliance knowledge required |
Slope Calculation
The ADA 1:12 rule is the standard: for every 1 inch of rise, you need 1 foot of ramp.
Formula:
Rise (inches) ÷ 12 = Minimum ramp length (feet)
Example: Front door is 8 inches above the walkway. 8 ÷ 12 = 0.67, so you need at least an 8-foot ramp.
If you have the space, go shallower. A 1:16 or 1:20 slope is easier for manual wheelchair users and reduces fall risk on the slope itself.
Landing Requirements
ADA requires a landing at both the top and bottom of every ramp run. The minimum landing size is 5 feet by 5 feet. This gives a wheelchair user enough space to turn and open a door without rolling backward off the ramp.
For ramps over 30 feet long, a landing is also required at the midpoint. If the available space does not allow for a landing, a switchback ramp design (two sections with a landing between them) is the solution.
Permit Requirements
Most jurisdictions require a building permit for any permanent structure attached to the home, including ramps. Permits protect you: the inspector will confirm the ramp is built to code before you sign off on the job.
Many areas have expedited or fee-waived permits for accessibility modifications. Ask when you call the building department. The permit application typically requires a simple sketch showing rise, run, width, and landing dimensions.
Portable ramps do not need permits because they are temporary.
Surface Treatment
A wet ramp is a dangerous ramp. These surface options prevent slipping:
- Aluminum diamond plate: built into most prefab modular ramp sections, no maintenance required
- Non-slip coating (Rust-Oleum or similar): spray or brush on wood or existing concrete, reapply annually
- Rubber non-slip mat: adhesive strips work for short portable ramps on smooth surfaces
- Grit tape: very effective, common on vehicle ramps, replace when worn
Hiring a Contractor
For any ramp that needs a permit, a landing, or is attached to the home structure, hiring an aging-in-place contractor is the safer route. A CAPS-certified contractor (Certified Aging-in-Place Specialist) knows ADA standards, can pull the permit, and may be able to help you access Medicaid or Medicare Advantage funding.
Find a contractor:
Frequently Asked Questions
Do I need a permit to install a wheelchair ramp?
Most jurisdictions require a building permit for permanent structures attached to the home. Portable ramps do not need permits because they are not permanent. For permanent modular ramps, check with your local building or zoning department. Many areas have exemptions or fast-track processes for accessibility modifications.
How do you calculate wheelchair ramp slope?
Use this formula: rise in inches divided by 12 equals the minimum ramp length in feet. A 6-inch rise needs a 6-foot ramp at a 1:12 slope. If you have room for a gentler slope (1:16 or 1:20), use it. Gentler slopes are easier for manual wheelchair users and safer for everyone.
How wide does a wheelchair ramp need to be?
ADA requires a minimum clear width of 36 inches for a single-user ramp. For a home where two people may need to pass or a caregiver walks alongside, 48 inches is better. Wider is always better up to about 60 inches, after which extra width adds cost without adding safety.
What is the best surface for a wheelchair ramp?
Non-slip aluminum diamond plate is the most common surface for residential aluminum ramp systems. It is weather-resistant, durable, and works in wet and cold conditions. Non-slip coating applied to pressure-treated wood works well for DIY wooden ramps but needs reapplication every 1 to 2 years.
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