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Step 1
Design your ramp. First, determine where the ramp will end. Then measure out to where the ramp will start, using a formula of 12 to1--that is, for every 1 foot the ramp must rise, it should have 12 feet of length. Mark where your ramp will begin. In some cases, you may have to add a turn or two into the design to accommodate limitations in the size of the property.
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Step 2
Set two rows of posts for the ramp. Set 4-by-4-foot pressure treated posts into holes spaced every 3 feet. The posts will also be used for the handrail, so ensure that they extend at least 36 inches higher than the height of the actual treadway. For each post, dig a hole 18 inches deep, and set the posts into ready-mix concrete. Use a spirit level to keep them straight while they set.
How to Build a Wheel Chair Ramp for a House
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Step 3
Install the stringers, one on each side of the row of posts. Attach the stringers with heavy lag bolts, and use 1-by-8-foot pressure treated wood. You'll be placing the treadway on the stringers, so check that both sides are level with each other as you install them. This will ensure a level treadway, side to side.
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Step 4
Lay the decking of the ramp. This is the actual treadway, what the wheelchair will roll upon. Make this out of 1-by-4-foot pressure treated lumber, attaching each plank to the treadway with wood screws. Trim the ends so they are even with the stringers. Leave a small gap between each to allow drainage of water.
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Step 5
Install a handrail. Level the tops of the posts so they are consistent to the treadway, and install a handrail you've purchased from a building supply store. Paint or stain the handrail to that it resists weathering.
