The short version: Curved stair lifts cost 3x straight ($9,000-$20,000 vs $3,000-$8,000) because of the custom rail. For homes with any stair turn, curved is the only single-lift option. Two-lift split installs and through-floor lifts are alternatives in some cases.
Why curved is more expensive
A straight stair lift uses a 12-foot aluminum rail extrusion cut to length. Same rail works on any straight stair.
A curved stair lift uses a rail manufactured for your specific staircase. The dealer takes laser measurements, the manufacturer fabricates over 6-8 weeks, the rail fits one staircase only.
That custom fabrication is most of the price difference.
When curved is the only option
If your stairs have any of these, curved is the only single-lift answer:
- A 90-degree turn (most common. L-shape staircase).
- Two consecutive turns (U-shape).
- A spiral or curved staircase.
- An intermediate landing where the stair direction changes.
For straight-only staircases, never pay for curved.
Two alternatives to one curved lift
Option 1: Two straight lifts at a landing
If your stairs have a landing midway, you can install one straight stair lift below the landing and another above. The user transfers between lifts on the landing.
Total cost: $6,000-$12,000 (two lifts × straight cost). Less than one curved lift.
Trade-off: the user has to stand and transfer at the landing, which defeats the purpose for some users with significant mobility limits.
Option 2: Through-floor lift
Replace the stair lift entirely with a through-floor home lift. Cost $25,000-$50,000, more than curved stair lift, but works for wheelchair users who can’t do stair lifts at all.
Realistic curved cost ranges
| Configuration | Installed cost |
|---|---|
| Single 90-degree turn | $9,000-$13,000 |
| Two 90-degree turns (U-shape) | $12,000-$18,000 |
| Spiral or unusual configuration | $15,000-$25,000+ |
Brand picks for curved
The same brands that lead straight stair lifts also lead curved:
- Acorn, value tier, $9,000-$15,000
- Bruno Elite, premium US-made, $12,000-$18,000
- Stannah, premium British, $14,000-$20,000
See best stair lifts of 2026 for full brand details.
What to do next
If your stairs are curved: measure the staircase yourself before any dealer visit so you know what fits, then get measurements from 2 dealers. Both should provide a written quote with itemized rail cost vs install cost.
If you’re considering alternatives: see stair lift vs home elevator and through-floor home lifts.
For broader cost details, see stair lift cost: straight vs curved.