Both rails on the stoop
A second rail anchored into brick or concrete gives both hands a hold, going up and coming down. In a DC rowhouse it is the most useful entry fix there is.

Washington, DC
Rails on both sides of the stoop, ramps where the lot allows and a measured plan for every other door.
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If a parent cannot get in the door, nothing inside matters. In DC that door usually sits above the sidewalk, up a stoop or porch steps with one rail or none.
Most rowhouse fronts have no room for a ramp. The lot is narrow and the steps run right down to the sidewalk. So the first fix is a solid rail on both sides, and the next is often a different door.
A ramp still makes sense on plenty of DC lots. Detached houses in the outer neighborhoods and rowhouses with a deep rear yard often have the room, and the assessment tells you which kind of lot you have.
A second rail anchored into brick or concrete gives both hands a hold, going up and coming down. In a DC rowhouse it is the most useful entry fix there is.
Many DC houses have a rear door a step or two above a yard that opens onto an alley. A short ramp or a level path there can become the main way in.
In neighborhoods with side yards, a built ramp can run along the house to a door near grade. Ramps typically run $1,000 to $10,000, set by the length the slope demands.
Old front and interior doors are often narrow. Widening one typically costs $300 to $2,500 per door, and lever handles can replace round knobs during the same visit.
Typical installed ranges are on the ramps and access page and in the guide How much does a wheelchair ramp cost in Washington, DC?. Your own price comes in writing after the walk.
On most DC rowhouses the front yard is too short for a ramp at a safe slope. The assessment measures it, and if a ramp will not fit, you see the other options in writing.
Yes. Modular aluminum ramps bolt together and come out again, which suits a rental or a recovery of a few months.
A built ramp generally does, through the DC Department of Buildings. The scope lists that permit before any work begins.
Often. Nobody fumbles for keys on a dark stoop, and family or a caregiver can get in without a spare hidden under the mat.
A new ramp at the stoop rarely settles the whole house. If the walk also flags the upstairs bath or the narrow inside stair, the page for each of those fixes is linked here.
Have the DC stoop and every other door measured so the ramp goes where it fits best.