A safe wheelchair ramp follows a simple rule: for every inch of height you need to climb, the ramp runs one foot in length. That 1:12 ratio is the slope the ADA standard sets for ramps in public accommodations, and it is the figure most home builders treat as the benchmark too. A two-step porch at 14 inches of rise therefore calls for roughly a 14-foot run, plus a flat landing at the top.
Steeper is possible in tight spaces — the ADA standard allows a 1:10 slope for very short rises and 1:8 only in limited existing-building cases — but a steeper ramp demands more strength from the person pushing or propelling the chair, especially in wet weather or snow. When in doubt, longer and gentler wins. Requirements also vary by jurisdiction, building type, and program: what a public building must meet is not what your local code will ask of a private porch, so check with your building department before you draw anything.
This guide covers how to work out the slope and length you need, what each ramp material does over years of weather, what permits typically apply, and the honest dividing line between a do-it-yourself project and one for a contractor. It is information, not advice — your contractor, building department, and any funding program make the final call. (One housekeeping note: search "ramps" online and you will also find the wild leek. Penn State Extension's guide to ramps (Allium tricoccum) covers the edible woodland onion of the same name — a different project entirely.)
How do you work out slope and ramp length?
Measure the rise first: the vertical distance from the ground to the door threshold or deck surface. Then divide by 12 to get the minimum run at a 1:12 slope. Fourteen inches of rise means about 14 feet of ramp. Add a level landing at the top — at least as long as it is wide, and big enough to hold a wheelchair clear of the door swing — and a landing at the bottom so the chair does not roll straight into the yard.
If the total run will not fit in a straight line, switchbacks solve it. Two 8-foot runs joined by a flat landing take the same rise as one 16-foot run and fit along a shorter wall. Our earlier piece on Outdoor Ramp Slope and Landing Requirements, Explained walks through the landing dimensions in more detail.
Two practical checks before you commit to a layout. First, walk the route the chair will actually travel — from the street or driveway, across the yard, up the ramp, through the door. A gentle ramp that ends in soft grass or a steep driveway apron helps nobody. Second, look at the door itself; if the threshold or clear width is the real bottleneck, fixing the door may matter more, and our guide to How to Widen a Doorway for Wheelchair Access covers that job.
Which ramp material should you choose?
Each material trades cost, upkeep, and grip differently. The right answer depends on how long the ramp must run, how long you plan to stay in the home, and who maintains it.
- Wood. Pressure-treated lumber is the cheapest material per foot and the easiest for a confident DIYer to work with. The trade is upkeep: boards need sealing, boards can warp and splinter, and rain makes bare wood slick. Grooved or textured decking and periodic resealing manage that, but wood ramps are maintenance projects, not install-and-forget ones.
- Aluminum. Modular aluminum systems come in prefabricated sections with textured, slip-resistant surfaces and handrails that bolt together. They install in a day or two, they do not rot or rust, and they can be taken apart and moved to a new home. The material costs more per foot than lumber, and the look is industrial rather than architectural.
- Steel. Strong and long-lived, often used for longer commercial-style runs. It is heavier to work with and needs a quality coating, because rust spots on bare steel spread. Most residential steel ramps are fabricated and installed by a company rather than built on site.
- Concrete. The most permanent answer, and the one that looks best on a well-designed home. It is also the most expensive and the least reversible, and it needs a proper footing and drainage plan. Concrete is a contractor job in almost every case.
A quiet point about design: a ramp is part of the front of your house. Wood and concrete can be detailed to look like they were always there — matching railings, paint, and landings that read as a porch. Aluminum announces itself. If the view from the street matters to you, weigh that honestly alongside the price.
Prefabricated versus built on site: what does each really cost?
There is no single price for a ramp, because length, material, site work, and local labor rates all move the number. What holds true everywhere is the shape of the trade-off.
| Approach | Upfront cost | Upkeep | Best fit |
|---|---|---|---|
| Modular aluminum, supplied and installed | Highest material cost; low labor on site | Minimal — occasional bolt checks and surface cleaning | Temporary need, rental homes, likely move |
| Wood, built on site | Low material cost; labor-heavy | Regular sealing, board replacement, grip upkeep | Handy owner-occupier, modest rise, staying put |
| Concrete, contractor-built | Highest total cost; site work and curing time | Very low once cured | Permanent home, long ramp, street-facing design |
Get at least two or three quotes for anything beyond a short wooden run, and make sure each quote states the slope, total run, landing sizes, handrail height, and footing method. Two bids that look similar on paper can differ sharply once you compare the footings. If funding is part of the picture — Medicaid waiver programs, VA grants, or state and local schemes — note that eligibility rules are stated by each program and vary by state; our overview of accessible housing funding topics is a starting point, and the program's own page is the authority on what it covers.
When is a ramp a DIY project — and when is it not?
A short wooden ramp for a single step or a small porch, on level ground, with a rise under about a foot, is the classic DIY case. The carpentry is straightforward: footings, stringers, decking, and a simple handrail. What separates a good build from a marginal one is usually not skill but discipline — holding the 1:12 slope exactly, anchoring the footings below frost depth where that applies, and not letting the boards deflect under load.
Call a contractor when any of these apply:
- The rise is more than about a foot, which pushes the run past 12 feet and usually means switchbacks or a longer footprint with real site grading.
- The ground slopes, holds water, or needs retaining — earthwork is its own trade.
- You want concrete, steel fabrication, or a lift instead; a vertical platform lift is a different machine with different rules, compared in our piece on Home Elevator vs. Vertical Platform Lift: A Comparison.
- The ramp attaches to a deck, porch, or masonry wall in a way that loads the existing structure.
- A permit is required and the drawings need a professional's stamp — see below.
Handrails deserve their own mention. Ramps with a significant rise need graspable handrails on both sides, mounted at a consistent height, with the rail extending past the top and bottom of the sloped run. This is detail work, and it is where homemade ramps most often fall short of the standard. Our guide on Grab Bar Placement: Heights and What the Standards Say covers the related grab-bar dimensions indoors, and the same plain-spoken logic applies outside.
Do you need a permit to build a ramp?
Often yes, sometimes no — it depends entirely on your local building department. Many jurisdictions treat a low, detached wooden ramp as exempt from a building permit, while anything attached to the house, anything in concrete, or anything over a height threshold will need one. Some jurisdictions also have zoning rules about how close a structure may sit to the property line, which matters when a long run hugs a side yard.
The practical step is a phone call or a look at the department's website before you buy lumber. Ask three questions: does this ramp need a permit, are there setbacks that limit where it can sit, and are there requirements for footings or handrails beyond the standard? An approved permit also protects you later — when you sell, an unpermitted structure is a question a buyer's agent will ask, and "freshly painted for a reason" applies to unpermitted work as much as to anything else.
What this means for your project
Start with the rise, hold the 1:12 slope, and size the landings before you choose a material. Wood rewards a handy homeowner with the lowest material bill and the highest upkeep; aluminum costs more and asks almost nothing of you afterward; concrete is the permanent, street-facing answer. Permit rules are local, so confirm them early. And be honest about the DIY line: a gentle one-step ramp is a satisfying weekend build, while a long switchback run with footings, handrails, and grading is a job you hire out. For smaller entry fixes, our Threshold and Doorway Ramps: A Mini Guide covers the short modular ramps that solve a single high sill — sometimes the whole problem is smaller than it looks.
