How Much Does a Deck Cost in Columbia County, Oregon?
Real 2026 numbers from a local deck builder — cedar vs. composite per square foot, covered decks, second-story decks, railings, and repairs. No games, no “starting at” bait.
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2026 Deck Prices for St Helens & Scappoose
Most decks we build in Columbia County land in these ranges. They include footings, framing, decking, a basic railing, and cleanup — the whole job, not just boards. Every site is different, so treat these as honest planning numbers and get a free firm bid for your actual project.
| Project | Typical Cost (2026) | What Moves the Number |
|---|---|---|
| Cedar deck | $40–$60 / sq ft | Height, stairs, railing style, board pattern |
| Composite deck (Trex-style) | $60–$90 / sq ft | Board line/grade, hidden fasteners, framing spacing |
| Covered deck / patio cover | + $30–$60 / sq ft over the deck | Roofing material, house tie-in, engineering |
| Second-story / elevated deck | + 15–30% vs. ground level | Bigger posts & footings, beams, staging, code railing |
| Railing replacement | $60–$120 / linear ft (wood) | Metal baluster & cable rail run higher |
| Deck repair | $500–$5,000 typical | Soft boards vs. structural rot — see below |
Quick math: a 12×16 deck (192 sq ft) runs roughly $7,500–$11,500 in cedar or $11,500–$17,500 in composite at these rates. A 16×20 (320 sq ft) roughly $13,000–$19,000 cedar / $19,000–$29,000 composite.
Why Two “Same-Size” Decks Can Be $8,000 Apart
Square footage is only the starting point. When we bid a deck in St Helens or Scappoose, these are the things that actually move the number:
- Height. The second-story deck pictured here needs engineered beams, big footings, and fall-rated railing — a ground-level platform doesn’t.
- Railing. A basic wood rail, a horizontal-slat modern rail, metal balusters, and cable rail can each be thousands apart on the same deck.
- Stairs. Every stair run is framing, railing, and labor — long runs on a slope add up fast.
- Site & access. Slopes, soft soil, and tight backyard access (common on our hillside lots above the Columbia) add excavation and labor.
- Permits & engineering. Decks over 30″, attached, or covered need permits; St Helens, Scappoose, and the county each do it a little differently. We handle it.
The unglamorous parts — ledger flashing, footing size, joist protection — are where cheap decks fail in our climate. That’s the part of the bid worth paying for.
Where Your Money Actually Goes
The deck pictured here is tight-knot cedar with a picture-frame border — built this summer for a Columbia County homeowner. Cedar is the budget-friendlier build and it’s beautiful, but it wants a wash and re-stain every couple of years to stay that way.
Composite flips the math: more up front, almost nothing after. No staining, and it shrugs off the moss and nine months of moisture that eat neglected wood decks around here. Over 15 years, a maintained cedar deck and a composite deck often cost about the same — the difference is whether you pay in money or in weekends.
Not sure? We’ll price your project both ways in the same written bid so you can decide with real numbers instead of internet averages.
Price My Deck Both WaysMore on materials and our process on the main deck building page — or the Scappoose deck builder page if you’re across the hill.
How to Keep the Cost Down (Without a Deck That Fails)
Simplify the shape
A rectangle costs meaningfully less per foot than wraparounds, angles, and multi-level designs. Spend the savings on better boards or railing.
Keep it low if you can
If your yard allows a ground-hugging deck, you skip engineered posts, long stairs, and some railing — often the single biggest saving.
Phase the cover
We can build the deck now with footings sized to carry a roof later, so the covered-deck dream doesn’t require the covered-deck budget today.
Reuse a sound frame
If your framing and footings pass inspection, new decking and railing over the existing structure costs a fraction of a full rebuild.
Mind the railing line
Railing is priced by the foot — designs that use the house or a bench on one side can trim real money on smaller decks.
Book the off-season
Summer slots fill first in Columbia County. Fall and winter builds (yes, we build in the rain) are easier to schedule.
Deck Pricing Questions, Answered Straight
How much does a deck cost per square foot around St Helens?
Cedar typically runs $40–$60 per square foot built; composite $60–$90. That’s the complete job — footings, framing, decking, basic railing, cleanup — not a materials-only teaser number.
What does a typical 12×16 deck cost?
192 square feet works out to roughly $7,500–$11,500 in cedar or $11,500–$17,500 in composite for a low deck with normal access. Height, stairs, and premium railing move it up from there.
How much more is a covered deck?
Plan on roughly $30–$60 more per covered square foot for a timber-framed roof, depending on roofing material and how it ties into the house. It’s the upgrade that turns a summer deck into a year-round room out here.
Does a second-story deck cost more?
Yes — figure 15–30% over a comparable ground-level deck. Elevated decks need engineered beams, larger posts and footings, code-critical railing, and more staging labor. It’s also exactly where you don’t want the low bidder.
What does replacing just the railing cost?
Wood railing commonly runs $60–$120 per linear foot installed; metal baluster and cable systems run higher. If your frame is sound, it’s the fastest way to make an old deck look — and feel — safe again.
Repair or replace — how do I know?
Sound framing and footings: repair ($500–$5,000 covers most jobs — boards, refastening, rails, stairs). Rotten joists or ledger: put the money toward replacement instead. We’ll tell you which side of the line you’re on at a free site visit, even if the answer is “don’t hire us yet.”
Why not just use an online deck cost calculator?
National calculators average Texas slab-yard decks with Oregon hillside decks. They don’t know your slope, soil, access, jurisdiction, or our wet-climate detailing. Local numbers from a local builder — or better, a free written bid — will always beat them.
Get a Firm Number for Your Deck
Tell us the rough size and what you’re picturing — we’ll walk the site and put a real price on it. Free, written, no pressure.
Stop Guessing — Get a Real Number
A 20-minute site visit beats any calculator. Free written bids for St Helens, Scappoose, and all of Columbia County.
Call 503-369-1287Prices reviewed: August 2026