In this case, our engineers addressed a frequent design concern: how much space must be left behind the top step riser for Sesame’s vertically retracting stairs?
## The Challenge
On heritage and retrofit sites, designers often assume a large void must be reserved. In one example, an existing project had **400mm** left behind the riser—far more than needed. This can waste space and complicate architectural finishes.
## Sesame's Approach
For our Buckingham Lift and Wellington Lift—both part of Sesame’s vertically retracting stair range—only 60mm of space behind the top step riser is required. This 60mm accommodates the A-frame support and trim beneath the clad riser, ensuring a neat and safe finish. While our engineers can work with tighter tolerances if absolutely necessary, 60mm is the standard design requirement for these products.
## The Outcome
By clarifying this, the design team avoided leaving an unnecessary 400mm void. Instead, the stairs could be finished flush with the building, delivering a seamless, compliant and discreet accessibility solution.
## Why This Matters
Every millimetre counts in heritage sites and tight retrofit projects. By establishing that the Buckingham and Wellington vertical retracting stair lifts only need 60mm behind the top step riser, our engineers help architects preserve the original fabric and avoid unnecessary voids. This precision saves space, reduces building work and ensures the finished stairs remain flush and discreet.
## Q&A
Q: Which Sesame lifts need only 60mm behind the top step riser?
A: The Buckingham Lift a: The Buckinghamnd the Wellington Lift, part of our vertically retracting stair range.
Q: Why is the 60mm needed?
A: To house the A-frame and trim that support the clad riser and allow a neat finish.
Q: What if 60mm cannot be achieved on site?
A: Our team can adapt the design, but it adds complexity. If pit depth is also restricted, we may recommend alternatives such as the Kensington Lift or the Thames Lift.
Q: How does this compare to rising barriers or gates?
A: A rising barrier may need 900mm behind the riser to a 1.6m depth, while a manual removable gate uses much less space.
Q: Why highlight Buckingham and Wellington specifically?
A: These are Sesame's flagship vertically retracting stair models, where the 60mm rule applies directly.