What is the minimum width for a stair lift?

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The minimum width required for a stair lift installation is typically 800 mm (31.5 inches). This space allows most standard stair lift models to operate safely and comfortably for an average adult. However, in some cases, ultra-compact models can be installed in staircases as narrow as 700 mm (27.5 inches), depending on the stair design and user needs. A professional assessment is essential to determine feasibility.

Why is stair width important for installing a stair lift?

Stair width directly affects the functionality, safety, and comfort of a stair lift. Without adequate clearance:

  • The user may struggle to sit or get off the chair.

  • The lift could block the stairs for other users.

  • Safety regulations or building codes may be violated.

In general, a stair lift must not only accommodate the seated user but also leave enough clearance for foot traffic, especially in public or shared staircases.

What factors influence the minimum width requirement?

Several elements beyond the stair width determine whether a stair lift can be installed:

1. Staircase configuration

  • Straight stairs typically require less space and support most standard lifts.

  • Curved or spiral staircases may need customized tracks and slightly more width.

  • Narrow stairs may require folding seats or slim-profile models.

2. Installation side

The lift can be mounted on the inner or outer rail of the staircase. The outer side often provides more space for wider or taller users, but this depends on the wall and handrail setup.

3. Presence of landings

The top and bottom landings must provide enough space to park the stair lift without obstructing walkways or doors. This is particularly important in compact homes or shared buildings.

4. User-specific factors

  • Height and weight of the user

  • Need for additional support (e.g., swivel seats, footrests)

  • Mobility level (e.g., ability to transfer onto the chair independently)

 What are the standard dimensions of stair lifts?

Stair lifts are designed to be compact, but exact measurements vary by model. Below is an overview of typical sizes:

Component Typical Dimensions
Minimum stair width 800 mm (31.5 in)
Ultra-compact lift width 700 mm (27.5 in)
Chair width 620–650 mm (24–25.5 in)
Chair height ~940 mm (37 in)
Folded width (chair closed) ~300 mm (12 in)

Some advanced models fold automatically to minimize obstruction when not in use.

Can stair lifts be installed on very narrow stairs?

Yes, modern engineering has made it possible to install stair lifts in narrow spaces:

  • Slim-profile chairs: These are specifically designed for tight spaces.

  • Foldable seats and footrests: Reduce the chair’s footprint when not in use.

  • Customized rail tracks: Built to follow the staircase’s contour precisely.

That said, for stairs under 700 mm wide, an in-person evaluation is essential. It may be possible, but custom solutions might be needed.

What standards or codes apply to stair lift installation?

In Europe, stair lift installations must comply with Directive 2006/42/EC on Machinery Safety. This directive ensures:

  • The product meets mechanical safety standards.

  • It includes essential features like emergency stops and secure seatbelts.

  • It poses no obstruction to escape routes or building access.

Additionally, Spain’s Código Técnico de la Edificación (CTE) may specify minimum evacuation widths, especially in public buildings and shared spaces.

Do stair lifts obstruct the stairs for other users?

When installed properly, stair lifts should not obstruct regular use of the stairs. Most modern models fold neatly against the wall when not in use. This is particularly important in:

  • Multi-family buildings

  • Offices

  • Public facilities

If minimum clearance for evacuation (usually 1 meter) is required, compact models or alternatives like platform lifts might be better suited.

What should you expect during a stair lift assessment?

At Elevadores Vilber, our expert technicians evaluate your staircase before recommending any model. During a visit, we:

  1. Measure the width and angle of the stairs

  2. Evaluate landing areas

  3. Determine optimal side for rail installation

  4. Assess the user’s physical needs

  5. Ensure compliance with legal standards

After the assessment, we’ll provide a tailored quote and a recommended model that fits both your home and your needs.

What options exist if your staircase is too narrow?

If your staircase is too narrow for a standard stair lift, here are some alternatives:

  • Install a stair lift on the wall side rather than the railing

  • Use a compact or folding chair model

  • Consider vertical platform lifts if stair width is not sufficient

  • Relocate to a different part of the house if architectural changes are viable

Each home is unique, and our team will help you find the best solution based on your space and mobility requirements.

Conclusion: Is your staircase suitable for a stair lift?

If your stairs are at least 800 mm wide, you likely meet the minimum width for a stair lift installation. For narrower stairs, don’t assume it’s impossible—custom or compact solutions may be available. Always consult with an experienced provider to ensure the safety, efficiency, and suitability of your chosen stair lift.

Need help choosing the right model? Contact Elevadores Vilber today for expert advice and a free, no-obligation quote.