How to choose between straight and curved stairlifts
Look at the stairs before you look at brands. The chair is similar either way. The rail is not.
Need A Stairlift does not sell, install, rent, or service stairlifts. We collect competing installer quotes for you, free. Installers never get your last name, phone, or email.
The simple test
Stand at the bottom and look up.
If the stairs run in one line from the first tread to the last, with no landing in the middle and no pie-shaped steps, you need a straight rail. Stannah says the only extra requirement is enough landing space at the top and bottom so you can get in and out of the chair safely.
If the stairs turn, you need a curved rail. Stannah lists the usual layouts: a half landing with two flights running parallel, a quarter landing with the flights at 90 degrees, fanned (wedge) treads, or a spiral. As long as the curve can be measured, a curved lift can usually follow it. Our FAQ uses the same rule. More on that job is in do stairlifts work on curved stairs.
Do not guess from a photo of someone else's house. A small wiggle at the top newel, a single pie step, or a door that sits on the bottom landing can change the rail.
Straight is cut to length. Curved is built for one house.
Stannah's rail guide puts it plainly. Straight rails are mass-produced and cut to length. They are typically aluminum. Stannah wants the stairs at least 28 inches wide, with enough headroom. The rail itself sticks out about 6 inches onto the steps. It often sticks out around 18 inches at the bottom so the chair has a place to land. If a door or walkway sits there, you may need a hinged or retractable rail that folds up.
A curved rail is custom-made so the chair stays level through the bends. Width is not one number, because pie steps change as you go. Stannah splits curved rails into two families. A custom (bespoke) rail is built for your stairs and usually hugs the turns tighter. A modular rail is assembled from prefabricated pieces and can arrive sooner. The ride is often less smooth on a tight spiral.
Bruno's 2026 cost page treats curved and spiral stairs as the more complex job. Length, number of turns, and how sharp the angles are all feed the price. Bruno's 2026 guide says it handcrafts those rails so they follow every angle and leave more open space on the steps.
Savaria's Handicare 4000 is a twin-rail curved lift they custom fabricate. They say they can produce one in as little as two weeks, and they use a photo-measuring system so you can see the rail on your stairs before you buy.
For both types, the rail bolts to the stair treads, not the wall. Stannah, Bruno, and Savaria all describe it that way. No rebuilt staircase.
A landing in the middle is the fork in the road
People sometimes hope two cheaper straight lifts will replace one curve.
Bruno's cost page says a continuous curved lift from top to bottom is the usual approach when stairs hit a landing and then turn. Two straight lifts can cost less. You then have to get off one chair, cross the landing, and get on the other. That is a real option if transferring is easy. It is a different job than one rail that goes all the way.
If one quote is two straights and another is one curved rail, you are not comparing the same thing. Write that down before you pick a number.
Price and wait are the other two differences
Stannah's complete guide says new straight prices usually start at $5,700, subject to change. New curved prices usually start at around $13,500, subject to change. Extra options such as a powered swivel or a retractable rail move those numbers.
Lifeway puts a new straight lift, installed, at $2,900 to $8,000. A curved lift likely starts around $12,000 and goes up with the staircase. Those are published ranges, not a quote for your house.
A national brand can still quote $7,000 or more for a straight lift that a local installer prices for much less. Our FAQ has that comparison point. The gap on a custom curve can be larger. Published ranges also live in how much a stairlift costs.
Time follows the factory, not the afternoon of labor. Bruno puts straight indoor installs at 2 to 4 hours including delivery. A custom 400 lb curved order is typically several weeks from order to install, and install day itself commonly runs 4 to 8 hours. Savaria's "as little as 2 weeks" is fabrication time.
Straight rails can often be reused in another house if the next stairs are straight and not longer. A curved rail is made for one staircase. That matters if you might move, or if you only need the lift for a while.
Options that change the choice
These extras show up on both types, but they solve different problems.
- Retractable or hinged rail on a straight run, when the bottom rail would block a door. Stannah and Bruno both offer that.
- Park positions on a curve: a 90- or 180-degree turn so the chair sits around a newel instead of on the bottom tread. Bruno and Savaria both describe overrun finishes at the top.
- Powered swivel, so you do not have to twist the seat by hand at the landing. Stannah lists it as an option.
- Charging. Stannah says a straight rail has a charging strip, so the chair can park anywhere. A curved rail charges at a contact at the top or bottom. Park off that contact and the chair beeps.
Weight limits can differ too. Stannah's complete guide puts most straight lifts around 300 to 350 lb, and most curved lifts around 300 lb, with a Model 260 Plus option up to 352 lb on a curve. Match the published capacity to the rider.
What to check on the quotes
- Same job: one continuous rail, or two straights with a transfer
- Rail type: custom curve, modular curve, or cut-to-length straight
- Wait time, and whether an in-person measure is required before a firm price
- Hinged rail, park position, or powered swivel if the landings need them
- Who services it, and how far they are
- Price, and what it leaves out
Photo-based quotes from us are estimates. The company you pick will usually measure in person before a firm price on a curve. That visit happens because you invited it.
Start a quote request. Need A Stairlift gathers installer quotes for your ZIP code, free. They see stair photos, city, and rider details that affect fit. They do not get your last name, phone, or email. When the email arrives, check that every company quoted the same rail type. Then you call the one you want, with the quote number.