The Infinity heavy-duty stairlift is built for users up to 25 stone (160 kg) — about 35% above a standard stairlift's 19-stone (120 kg) limit. Wider seat, reinforced brackets, a stronger drive system and a heavier-duty battery, all certified to BS EN 81-40.
If the user is close to or above a standard lift's weight limit, the Infinity is the right call from day one. Standard lifts run within their rating will outlast a heavier user; standard lifts run over their rating fail early — brake wear, motor stall on the climb and premature battery drop-off.
At a glance
| Standard stairlift | Infinity heavy-duty | |
|---|---|---|
| User weight limit | 19 stone / 120 kg | 25 stone / 160 kg |
| Seat width | 42–46 cm | 50–55 cm |
| Arm width and strength | Standard | Reinforced |
| Drive motor | Standard | Higher-torque |
| Brake system | Standard | Heavy-duty |
| Battery capacity | ~10–15 return trips | ~10–15 return trips at higher load |
| Bracket spacing | Every 3–4 treads | Closer-spaced, additional fixings |
| Certification | BS EN 81-40 | BS EN 81-40 (heavy-duty) |
Who it's for
- Users between 19 and 25 stone (120–160 kg)
- Users at the upper end of the standard band who carry items, wear winter clothing or use mobility aids that add to the seat load
- Larger users who need more hip and shoulder room (the wider seat often matters more day-to-day than the weight rating itself)
- Daily heavy use where lift longevity matters
For users above 25 stone (160 kg), we fit specialist bariatric stairlifts rated to 30 stone (190 kg) — quoted on survey.
Built for daily heavy use
The Infinity isn't just a standard lift with a higher headline rating. The motor, drive belt and brake assembly are uprated; the rail uses closer-spaced bracket points to spread the load; and the seat frame is welded steel rather than the lighter pressed-steel of a standard chair. Battery undervoltage — the most common failure mode on overloaded standard lifts — is engineered out.
Standard features
- Folding seat, arms and footrest — staircase stays usable on foot
- Powered swivel at the top — safer transfers for larger users
- Obstruction sensors on the footrest and underside
- Seatbelt with secure latch
- Battery-powered — works through a power cut
- Charging at top and bottom of the stairs
- Joystick and remote-call controls
- Soft-start and soft-stop drive
- Diagnostic display with fault codes
Fitting and lead time
- Straight Infinity heavy-duty — fitted in 24–48 hours of survey, install takes 3–4 hours (slightly longer than standard due to additional bracket points)
- Curved Infinity heavy-duty — made to measure, 1–3 weeks, or 48 hours with our Emergency option
The survey is free, on-site, and confirms tread integrity for the heavier loading. Rotten or split treads must be repaired before fitting — uncommon, but we check.
What it costs
The Infinity range is priced above a standard stairlift because the components are larger and the install takes longer. Typical fitted prices:
- Straight Infinity heavy-duty — from £2,995 fitted
- Curved Infinity heavy-duty — quoted on survey, typically £3,500–£4,500 all-in
Both include the free home survey, installation, handover and a 12-month warranty. VAT relief (a 20% saving) applies for users with a long-term illness or disability.
If a standard lift would do the job safely, we'll tell you on the day — we don't oversell. But if the user is close to the standard 19-stone limit, the heavy-duty model is the safer long-term call.
- Family-run, Acorn-accredited local team
- Free no-obligation home survey
- 12-month warranty on every installation
- 24-hour emergency repairs across Greater Manchester
Aftercare
Heavy-duty lifts benefit even more than standard from annual servicing — the higher load on bearings, brakes and battery means small issues compound faster if left. Annual service from £80 per visit, 24-hour emergency callout across Greater Manchester. See servicing & repairs.
Book a free survey
Call 0161 330 5544 or request a callback. The surveyor will confirm the right model for the user's weight, the staircase and the day-to-day usage pattern, and give a fixed price on the day.
Our fixed prices
| Type | Fitted price | Lead time |
|---|---|---|
| Straight stairlift | £1,995 | 24–48 hours |
| Reconditioned stairlift | £995 | 24–48 hours |
| Curved stairlift | £2,995 | 1–3 weeks (or 48 hours with our Emergency option) |
All prices include the free home survey, installation, handover and a 12-month warranty.
Our stairlifts
- Straight stairlifts — £1,995 fitted
- Curved stairlifts — £2,995 fitted
- Reconditioned stairlifts — £995 fitted
- Outdoor stairlifts
- Servicing & repairs
Book a free home survey
Call 0161 330 5544 or request a callback. A local engineer will measure your stairs and give you a fixed price on the day — no pressure, no obligation.
Not sure which stairlift you need?
Book a free no-obligation home survey. A local engineer will measure your stairs and recommend the right lift — usually within 48 hours.