Pit depth

This is the area under the lower floor level, which houses the platform lift mechanisms. The pit depth is dependent on the rise of the staircase, as per the pit depth chart below:

Lift typeTotal riseRequired minimum pit depth (including cladding and bedding space)
This is the smallest depth that can be accommodated and is required for our Sesame Jubilee Lift or the Sesame Thames Stair Lift0 to 999mm160mm plus the thickness of the cladding.
Horizontally retracting stair lift such as the Kensington Stair Lift0 to 650mm450mm (including cladding and bedding)
Horizontally retracting stair lift such as the Sesame Regent Stair Lift0 to 999mm650mm (including cladding and bedding)
Vertically retracting stair lift such as the Sesame Victoria Stair Lift & Seattle ADA Lift
All850mm for the Victoria & 1,640mm for the Seattle
Rising button box on lifts such as the Sesame Knightsbridge Stair LiftAll1,350mm
Rising barrier on upper landing on lifts such as the Mayfair Stair Lift0 to 999mm1,600mm below upper landing finish floor, or 650mm below lower landing floor when the rise is between 950mm and 999mm
Rising barrier on lift on lifts such as the Sesame Whitehall Stair Lift0 to 2999mm1,800mm below lower landing finish floor (1,600mm on special design)

If you have concerns about pit depth, please contact us – we may still have a solution for you! Our design team can work around pit restrictions to some extent, such as when the area below is used for rentable space. Get in touch and we’ll have you find the correct solution.