The user's position changes the answer
Two people using the same chair can occupy very different amounts of space. Long legs, a stiff knee or difficulty keeping the feet on the footrest may bring the user close to the opposite wall or banister. Some chairs rotate slightly while travelling so the knees point along the stairs rather than straight across them. That may help, but the user must find the position comfortable and secure.
Measure the tightest part
The clear width can reduce beside a windowsill, handrail, newel post or wall projection. A staircase may also narrow near a turn. Measurements should cover the complete route and the folded lift, not simply one convenient tread. Removing a handrail should only be considered after checking whether other household members still need it.
Getting on and off can be harder than travelling
A lift may physically pass along the stairs but leave too little room on the lower hall or top landing. At the upper end, the user should normally turn towards a secure landing before standing. If a door opens across the parking position or the landing has another step, the risk has merely moved to a different place.
Ask for a practical demonstration
Try a comparable chair with the coat and footwear normally worn indoors. Check the belt, armrests, footrest and swivel mechanism. If the user needs assistance, the person helping should also try the routine. A drawing or photograph can show the likely rail position, but it cannot show whether the user can transfer without twisting or overreaching.
When another solution deserves consideration
A through-floor lift may suit a wheelchair user or someone who cannot transfer safely. Reorganising the ground floor can sometimes avoid daily stair use, though it may involve bathroom and sleeping arrangements. An occupational therapist can look at the whole routine rather than treating the staircase as an isolated obstacle.
Do not forget emergency access
Consider how somebody would pass the folded chair if they needed to reach the user quickly. The lift should not prevent another resident using the handrail or carrying essential items upstairs. Ask what happens if the chair stops at the narrowest point and how it can be moved safely. If the staircase is the only route from bedrooms, include fire-safety and evacuation questions in the wider assessment. The installer can explain the equipment, while the household and relevant professionals need to consider how the complete home works in an emergency. Photographs sent to a supplier can help with an initial conversation, but perspective can make stairs look wider than they are. Include the full flight, both landings and any doors, then expect accurate measurements before a firm proposal. If someone suggests removing a banister, ask how walking users will be supported and whether building requirements are affected. A compact seat or perch-style arrangement is not suitable for every user, particularly where balance, fatigue or the ability to bear weight is limited.
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