Key Takeaways
- Most standard stairlifts require a staircase width of 70–75cm.
- Slimline and specialist narrow-stair models can fit staircases as narrow as 61–65cm.
- The minimum width isn’t just about the staircase; it also depends on the user’s size, posture, legroom, and seat type.
- A professional home survey is always needed to confirm suitability.
Why Stair Width Matters
A stairlift needs enough space for the rail, seat, carriage, and the user’s knees, elbows, and feet during travel.
On narrow stairs, even a small difference in width can affect:
- Safe clearance
- Comfort
- Swivel space at the landing
- How easily can others pass when the stairlift is folded
This is why engineers measure stair width precisely before recommending a model.
Typical Minimum Width Requirements
Standard Stairlifts
Standard stairlifts usually need a staircase width of:
70–75cm (27.5–29.5 inches)
This allows enough room for:
- A full-size seat
- Armrests
- A footplate
- Comfortable knee clearance
These models are ideal for most modern UK homes.
Slimline / Narrow-Stair Stairlifts
Slimline stairlifts are specially designed for tight spaces and can typically fit:
61–65cm (24–26 inches)
They achieve this with:
- Narrow seats
- Compact carriages
- Slim rail profiles
- Fold-up seating
- Smart positioning closer to the wall
Some advanced curved models (like Flow-type stairlifts) can even operate on extremely narrow or steep staircases thanks to auto-swivel and auto-levelling technologies.
Perch / Standing Stairlifts
If stairs are too narrow for sitting comfortably, a perch stairlift may be suitable.
Minimum width can be even lower depending on the layout.
Best for users who:
- Struggle to bend their knees
- Prefer standing support
- Older homes have very narrow staircases.
Perch lifts are not suitable if the user needs back support or cannot safely stand for short periods.
What Else Determines the Minimum Width?
Stair width alone isn’t enough; engineers also consider the following:
1. User’s Knee and Elbow Clearance
If the user has long legs or a larger build, more width may be required even with a slimline model.
Engineers assess:
- Knee extension
- Foot placement
- Shoulder width
- Elbow room while holding the armrests
2. Seat Type and Size
Seat depth and width can vary significantly across stairlifts.
Options include:
- Compact seats
- Ergonomic seats
- Wide or deep seats
- Heavy-duty seat options
Choosing the right seat can make a borderline staircase fit safely.
3. Rail Positioning
The rail can often be:
- Set closer to the wall
- Set slightly higher or lower
- Adjusted to avoid bannisters or obstructions
Even a few centimetres can make a tight staircase workable.
4. Obstructions Along the Stairs
Engineers check for:
- Radiators
- Handrails
- Newel posts
- Cupboards
- Window sills
- Low ceilings
Obstructions may require alternative rail routing or a narrower seat configuration.
5. Staircase Gradient
Steeper stairs can reduce knee clearance because the legs extend farther forward.
A slimline or tilt-adjusting stairlift may be required.
Signs Your Staircase Is Likely Suitable
You probably have enough width if:
- Your stairs are 70cm+ → Standard stairlift usually fits
- Your stairs are 61–69cm → Slimline stairlift likely fits
- Your stairs are below 61cm → Specialist or perch options may still work, but a survey is essential
Most UK homes fall within the first two categories.
Conclusion
The minimum stair width for a stairlift varies by model, user, and staircase layout, but most homes with 65–75cm wide stairs can accommodate a stairlift without major changes.
For very narrow staircases, slimline or specialist models are often the perfect solution.
A professional home survey provides the certainty needed to choose the safest, most comfortable option for your specific home.