Stair Flooring in Oregon: Per-Step Costs and What Is Under the Carpet
A staircase is not a small floor. It is fourteen small carpentry jobs, which is why it is priced per step and why it belongs on its own line of the quote.
What it costs, and the unit that matters
Stairs run about $65 to $150 per step in Oregon. Carpet on an existing straight flight sits near the bottom; wood treads with returned ends, new risers and a matching landing sits near the top. Winders and curved flights cost more again because every piece is cut individually.
An estimate, not a quote. These are planning ranges for Oregon, not a quote. What you actually pay depends on your rooms, your subfloor and the material you choose.
Ask for it separately, every time
A quote that folds the staircase into the square footage of the floors is either guessing or hiding it. Ask for a per-step price and ask what a landing counts as. This is the most common cost surprise on an Oregon flooring job and it is entirely avoidable at the quoting stage.
What is under the carpet on a prewar Oregon staircase
In a house built here before about 1950 — and more than a quarter of Portland’s housing predates 1940 — the treads are frequently solid vertical-grain Douglas fir, sometimes with oak treads over fir risers. They are usually thick enough to refinish, and the fir in an old Oregon house came from tight-ringed timber considerably harder than the modern product of the same name.
Two cautions before getting excited. Tack strip and staples leave a line of holes along each tread edge, so a runner is often the honest answer rather than a bare tread. And a stripped, refinished staircase is a slippery staircase — a runner is safer as well as quieter.
Runner or full width
A runner shows the tread edges, is easier to replace and suits a refinished wood staircase. Full-width carpet is warmer, quieter and hides tack holes. Either way the pad matters more than on a flat floor: stairs want a firmer pad than the rooms so the nosing keeps its shape instead of rounding over within a year.
Code is a floor, not a preference
Riser heights within 3/8 in of each other across a flight, a nosing that projects consistently, and a handrail that runs the length. Adding wood over carpeted treads changes the top and bottom riser heights, and that is the detail that turns a simple job into a rebuild. Raise it before the quote, not after.
The Oregon staircase that goes somewhere different
Daylight basements are common on the west side of the state, and they produce a flight that runs from a heated living space to a room over a slab. Whatever goes on the treads is fine; what matters is what happens at the bottom, where the assembly changes and both a slab moisture test and a transition detail become part of the job.
Common questions
Can I carpet only the stairs?
Yes, and it is a sensible and common combination here — quiet and grippy where people fall, hard and washable where the wet comes in.
How long does it take?
A carpeted flight is a day. Wood treads and risers on an existing staircase is two to four days including finishing, and the staircase is out of use for part of it — which in a two-story house matters more than the cost.