A stairlift carries a rider on a seat along a stair-mounted rail; a platform lift carries a rider on a platform that must fit the person and device. For routes covered by the ADA Standards where platform lifts are permitted, the Access Board describes a maximum platform area of 18 square feet and requires unassisted entry and exit. Home codes and product fit depend on the exact site and model.
The key difference is how the rider travels. A stairlift carries a person on a seat, while a platform lift carries the rider on a platform; an exact model’s dimensions, capacity and route determine whether the device fits. This guide compares the lift types, while our straight versus curved stairlift guide covers rail shape.
Compare the lift types
| Lift type | What moves and what to measure |
|---|---|
| Stairlift | A seat travels on a rail mounted along the stairway. Measure stair width at obstructions, rail path, seat and footrest clearance, landing space, transfer setup and parking position. |
| Vertical platform lift | A platform travels vertically between landings. Compare usable platform size, capacity, entry and exit sides, travel height, gates, enclosure, power and space at both landings. |
| Inclined platform lift | A platform travels along a stair rail and may fold when parked. Check stair geometry, platform size, parking area, clear stair width and whether the installation preserves required egress. |
The U.S. Access Board explains that a stairway chairlift requires a transfer from a wheeled mobility device, while a platform lift can provide unassisted entry and exit when used on a route covered by the ADA Standards. The Board’s guide also describes a maximum platform area of 18 square feet for the referenced platform-lift standard and notes that inclined platforms must not encroach on required egress. These rules apply in their covered settings; they are not a universal residential building code. Read the Access Board’s platform-lift guide and check the rules for the actual project.
Choose around the route and routine
Start by mapping the levels to connect, available landing area, doors, stairs, turns and any required walking path. For a stairlift, the rider uses a seat, so the planned transfer and seat controls matter. For a platform lift, the exact platform, gate arrangement, travel and device clearance decide whether the rider can enter, exit and operate it as intended. An occupational or physical therapist can advise on seating or transfer needs; the installer surveys the route and equipment fit.
Specifications vary by model and configuration. Stannah’s current stairlift dimensions guide lists a 27-inch minimum staircase width for some straight stairlift configurations and 27 to 30 inches for curved models, measured from obstructions; the company says an in-home survey is needed to verify fit. Savaria’s V-1504 vertical platform lift page shows that platform sizes and enclosure configurations also vary by product. Treat these as examples, not universal dimensions.
Ask the installer to document the usable platform or seat area, rated capacity, door and gate layout, power-loss behavior, structural attachment, maintenance plan, service coverage, permits and any fire or egress constraints. Compare the proposed route with ramp slope and landing requirements, and review Medicare equipment coverage before budgeting. Browse home accessibility.
Common questions
Can a wheelchair user ride a stairlift?
A stairlift has a seat, so the rider must transfer from a wheeled mobility device. A platform lift may carry the person with the device if the platform dimensions and capacity fit.
What is the difference between a vertical and inclined platform lift?
A vertical platform lift travels between landings beside a stair or raised area. An inclined platform lift travels along a stair rail on a platform that may fold when parked.
Are stairlifts allowed under the ADA?
The ADA Standards do not allow a stairway chairlift to replace a platform lift where the Standards permit a platform lift as an accessible route. Requirements for a private home can differ.
Does every platform lift fit a wheelchair?
No. Compare the exact platform's usable dimensions and capacity with the device, rider and entry path, then have a qualified lift installer survey the site.