STAIRIX

Reviews (000) 000-0000 Start your project

STAIRIX (000) 000-0000 Start Your Project

Cantilever stairs

U-ShapedCantileverStairs

Q: How wide does the stairwell need to be?

About 8 ft-6 in for two 42 in flights and an 8 in open well. Narrower treads or a narrower well can bring it closer to 7 ft-6 in.

A stairwell where the walls carry everything.

A U-shaped cantilever stair climbs one wall of a stairwell, turns 180° on a landing across the end wall and climbs back along the facing wall. The landing is held on three sides, the flights on their own walls, and the open well between them stays clear from the bottom to the top floor. From $66k in NJconfirm.

Get my price →How it works

PE-stamped engineering
NYC & NJ permits handled
Hidden steel, no visible fixings

U-shaped cantilever stair in a concrete stairwell: oak treads on facing walls joined by a landing on the end wall

Enquire

Scroll

What it is

Three walls, one open well.

The landing spans the full width of both flights and the gap between them, about 8′-6″, and is fixed into the end wall and both side walls. Each flight is a straight cantilever on its own wall. Between them an 8″ or wider open well lets light fall through the whole stair.

180°One full turn

3Walls hold the landing

≈ 8′-6″Stairwell width

U-shaped cantilever stair at night: light under every tread on both flights and the landing

At night · light under both flights and the landing

Made for stairwells.

Where a U-shaped cantilever fits and how it is held.

From above: Looking down the well: flight one on the left wall, the landing across the end,

01From above

Looking down the well: flight one on the left wall, the landing across the end, flight two on the right wall. Glass runs along both inner edges of the well.

Open well 8″ or widerGlass on both inner edges

From the bottom: Standing at the foot of the stair you look straight up the well. No stringers, n

02From the bottom

Standing at the foot of the stair you look straight up the well. No stringers, no posts, no landing beam: only treads coming out of concrete.

Light from a skylight reaches the floorIdeal for townhouse stair halls

Built to be looked at.

Nothing under the treads to hide behind. Every joint is drawn first.

Up the well. Nothing but treads and light. — **Up the well**Nothing but treads and light.

The stairwell. Both flights and the landing, no posts. — **The stairwell**Both flights and the landing, no posts.

Light under every step. Both flights and the landing. — **Light under every step**Both flights and the landing.

From above. Two flights, one turn, one open well. — **From above**Two flights, one turn, one open well.

Drawn as one piece. Walls, flights and landing in one model. — **Drawn as one piece**Walls, flights and landing in one model.

Nothing under the treads but air.Engineered in New Jersey, installed across NYC, Long Island and New Jersey.

The stair, in numbers.

A typical 10′ floor-to-floor stair. Your PE-stamped drawings set the final sizes.

U-shaped cantilever stair seen from above

Component	Specification
Flights	Two flights of cantilever treads on facing walls
Landing	Spans both flights and the well, steel frame fixed into three walls
Well	Open well 8″ or wider between the flights
Walls	Concrete, grouted block or framed walls with hidden stringers
Guard	Glass along both inner edges of the well
Handrail	Continuous on the outer walls
Loads	40 psf, plus 300 lb at any tread edge or landing corner

StairwellsPerfect where a townhouse or loft already has a stair hall with three walls.

Tall floorsThe landing splits the rise, so floors of 12′ and more are no problem.

Open wellA wider well brings more light down; we size it with you.

What it costs.

Installed prices: design, PE engineering, steel, treads, delivery and installation. Permit fees and co-op deposits are billed at cost.

U-shaped cantilever

NJfrom $66kconfirm

NYCfrom $76k

10–12′ floor to floor, two flights + landing
Concrete anchors or hidden stringers
Oak over steel, 42″ × 3¾″
Cable or rod guard, wall handrails

U-shaped Glass · most chosen

NJ$80–100k

NYC$90–115k

Same stair
Frameless glass along the well
Glass around the upper-floor opening
Walnut or smoked oak on request

All cantilever stairs

How cantilever stairs work, which walls carry them and the full price guide.

The landing across the well and the second wall add to a straight cantilever. Brick stairwells need liner walls, quoted. Code requirements for NYC, Long Island and NJ are on the cantilever stairs page.

Before we begin.

Send a photo of your wall and we'll tell you what fits.

What is a U-shaped cantilever staircase?

Two cantilever flights on facing walls of a stairwell, joined by a landing across the end wall. The landing is held by three walls and an open well runs between the flights.

How wide does the stairwell need to be?

About 8′-6″ for two 42″ flights and an 8″ open well. Narrower treads or a narrower well can bring it closer to 7′-6″.

How much does a U-shaped cantilever stair cost?

From about $66k installed in New Jersey and $76k in New York City with oak treads and a cable or rod guard. With frameless glass about $80–100k in NJ and $90–115k in NYC.

Does the landing need a post?

No. It is fixed into three walls, which makes it the stiffest part of the stair.

Can it go in a brownstone stair hall?

Yes, with new liner walls in front of the brick, so the old walls and any party wall are never loaded.

Get a price in 3 business days