Measure first: rise, depth, and the cat you have
Good pet steps start with two measurements: the height of the target surface, such as the sofa seat, bed, or windowsill, and your cat's comfortable step-up, which for a stiff senior is smaller than you might guess. Split the total climb into even rises so no single step is a stretch; as a working guide, each rise should feel like a kerb, not a stair, and each tread should be deep enough for your cat to stand on fully with all four paws before taking the next one. Watch your cat climb something it still manages easily, like a low garden step, and let that honest observation set your dimensions rather than a generic product size. A cat with very limited mobility may need a ramp instead, which is a perfectly good answer.
Choose materials that will not move, slip, or flex
Whether you build from timber, use dense foam steps, or buy a ready-made unit, the non-negotiables are stability and grip. The structure should be heavy or braced so it cannot slide on hard flooring, and it must not wobble or flex underfoot, because one frightening experience can retire the steps permanently. Cover every tread in carpet, carpet tiles, or another high-grip surface; bare wood and smooth plastic are skating rinks for elderly paws. If you build your own, round sharp edges and make each tread wide enough for your cat to turn around on safely.
Place steps flush, and think about the way down
Position the steps hard against the furniture with no gap between the top tread and the seat or sill, because a paw slipping into a crack is the classic pet-step injury. Check the descent as carefully as the climb: cats often find going down harder on the joints than going up, so the steps serve both directions and should be the obvious, easiest route down as well as up. Put the first set at the spot your cat uses most, usually the bed or sofa where it sleeps with you, and add further sets only once the first is accepted. Keep the area at the base clear and, on hard floors, anchor the base with a non-slip mat underneath so the whole structure starts on grip rather than slide.
Teach the steps without force
Most senior cats adopt steps quickly if the introduction is unhurried. Place a favourite treat on each tread in turn and let the cat discover the route at its own pace, praising each stage. Never lift your cat onto the steps repeatedly or push from behind; a cat that feels ambushed will avoid the structure. If your cat ignores the steps for the old jump, temporarily make the direct route less available by repositioning a cushion or plant at the launch point, and reward every voluntary use of the steps for the first week until the habit sets.
Maintain, adjust, and share the arrangement
Steps are care equipment, so maintain them like it: check weekly for wobble, tighten fixings, replace worn carpet before it smooths out, and vacuum grit from treads. As your cat ages further you may need to lower the challenge again by adding an intermediate step or swapping to a ramp, and needing that adjustment is normal, not failure. Tell everyone who cares for your cat where the steps are, that they should not be moved for cleaning and left elsewhere, and that the cat should not be lifted past them onto heights it cannot descend. Recording the routine in KinsLe's Care Teams, where care duties for your cat are assigned and ticked off, keeps sitters and family consistent about access, feeding, and step checks.