A staircase is usually considered “too narrow” for a stairlift if it cannot safely accommodate the chair while still allowing safe use of the stairs.
In practice, many stairlifts can be fitted to stairs as narrow as 700–750mm, and some specialist models work on even narrower staircases but safety clearances are the deciding factor.
There is no single minimum width that applies to every home.
Key Takeaways
- Many stairlifts work on stairs around 700–750mm wide
- Some slimline models can fit narrower stairs
- Usable width matters more than total width
- Clearance and safety are more important than measurements alone
- A professional survey is essential
What Is the Minimum Stair Width for a Stairlift?
As a general guide:
- 700–750mm wide stairs are often suitable for many standard stairlifts
- Under 700mm may still be possible with slimline designs
- Very narrow stairs may be unsuitable if safety clearance can’t be met
These figures are guidelines only suitability depends on the stairlift model and layout.
What Does “Usable Width” Mean?
Usable width refers to:
- The space available for the stairlift once handrails, skirting boards, and wall protrusions are accounted for
- The clear space left for safe movement and foot placement
A staircase may measure wide overall but have reduced usable width due to obstructions.
Why Safety Clearance Matters More Than Width Alone
A stairlift must:
- Allow safe seating and foot positioning
- Leave enough space at the top and bottom landings
- Avoid obstructing emergency exit routes
If these safety conditions can’t be met, the staircase may be considered too narrow regardless of its measured width.
Can Folding Designs Help on Narrow Stairs?
Yes.
Modern stairlifts often include:
- Folding seats, arms, and footrests
- Slim rail profiles
- Compact chair designs
When folded, many stairlifts leave enough space for others to use the stairs.
Are Narrow Stairs Better Suited to Straight Stairlifts?
Generally, yes.
Straight stairlifts:
- Require less space
- Are easier to fit on narrow stairs
- Offer more slimline options
Curved stairlifts often need additional clearance due to rail shape and bends.
When Are Stairs Too Narrow for Any Stairlift?
Stairs may be unsuitable if:
- There is insufficient space at landings
- Headroom is restricted
- The stairlift would block safe stair use entirely
- The user cannot mount or dismount safely
In these cases, alternative access solutions may be recommended.
How Is Final Suitability Decided?
A professional survey assesses:
- Stair width at multiple points
- Clearance when the stairlift is folded
- User size and mobility needs
- Safety at top and bottom landings
This ensures the stairlift is both safe and practical.
Final Verdict: How Narrow Is Too Narrow for a Stairlift?
There is no fixed width that is “too narrow” safety and usability are what matter most.
Many stairlifts can be fitted on stairs around 700–750mm wide, and some narrower staircases can still work with specialist designs.
A professional assessment is the only way to be sure.
