What a deck costs in Meridian

Every deck quote in the Treasure Valley reduces to five lines: footings, framing, decking, rail, and stairs. Cover, lighting, and demolition sit on top as separate items. When a quote is written that way you can see where the money goes and compare two bids properly. When it is one number and a square footage, you cannot.

The base: cost per square foot

These figures are installed and complete, meaning footings, framing, fasteners, decking, and labor, for a deck close to grade. Rail and stairs are extra.

The important thing in that chart is what stays constant. The frame beneath all four options is the same pressure treated structure on the same footings, so the material premium applies only to the boards, the fasteners, and the fascia. That is why capped composite costs roughly 40 to 70 percent more than treated pine installed, even though the boards themselves cost several times more per foot.

Rail, by linear foot

Rail is priced on the open perimeter, not the area, which is why a long thin deck costs more to rail than a square one of the same size. Typical installed rates in this valley:

• Pressure treated or cedar wood rail: $45 to $80 per linear foot
• Composite rail system: $75 to $130
• Aluminum picket: $80 to $140
• Stainless cable: $110 to $190
• Glass panel: $180 to $300

On a 320 square foot deck with roughly 50 feet of open edge, that is a spread from $2,250 to $15,000 for the same length of rail. Twenty to thirty percent of a deck budget going into rail is normal, and it is the single biggest surprise in most first quotes.

Stairs

A three-riser step down to the lawn is a few hundred dollars of framing. A flight down from a deck four feet up is a different item: 2x12 stringers, three of them minimum on a cut-stringer run, a footing under the stringer bearing rather than a bracket on a slab, a handrail returned at both ends, and a landing at the bottom. Budget $400 to $1,200 for a low step, $1,600 to $3,800 for a mid-height flight, and $3,200 to $7,500 where the deck is over four feet up.

Why height costs more than area

Doubling the square footage of a deck roughly doubles the decking and adds joists. Doubling the height changes almost everything else. Posts get longer and larger. Footings get bigger because they carry more concentrated load. Guards become mandatory once the surface clears 30 inches. The stair run gets longer and picks up a handrail requirement at four risers. Skirting or bracing may be needed.

In practice the same 320 square feet costs 12 to 22 percent more at 30 inches to 4 feet than it does at grade, and 28 to 55 percent more above 4 feet. On sloped Boise and Eagle foothills lots that premium is unavoidable. In flat Meridian it is often a choice, and it is worth pricing both.

Three worked examples

1. The first deck, treated, at grade

250 square feet, pressure treated, 20 inches above grade so no guard is required, three steps down to the lawn. Base at $32 to $48 per square foot gives $8,000 to $12,000. Steps add $400 to $1,200. No rail. Total: $8,400 to $13,200. This is the most common budget deck in Meridian and there is nothing wrong with it.

2. The one most people build

320 square feet, capped composite, 34 inches above grade so a guard is required, composite rail on about 50 linear feet, a five-riser stair with a handrail. Base at $55 to $88 with a height factor gives roughly $19,700 to $34,400. Rail at $75 to $130 gives $3,750 to $6,500. Stairs $1,600 to $3,800. Total: $25,000 to $44,700.

3. The covered outdoor room

450 square feet, capped composite, cable rail, a solid roof extension tied into the existing roofline, low voltage lighting. Base and height give roughly $27,700 to $48,400, cable rail on about 58 feet gives $6,400 to $11,000, stairs $1,600 to $3,800, roof extension $12,000 to $30,000, lighting $900 to $3,200. Total: $48,600 to $96,400. This is Eagle and Star territory more than Meridian, and the roof tie-in is the line with the widest spread because it depends entirely on how the existing roof is framed.

What sits outside these numbers

• Removing an old deck. $900 to $3,000, including disposal and repairing the wall where the old ledger came off. That wall repair is not optional and is often skipped in a cheap quote.
• Hot tubs. A filled tub with people in it is a large concentrated load that sits outside prescriptive framing tables entirely. Expect engineered framing and dedicated footings, $2,200 to $6,500 on top.
• Permit fees. Charged by the City of Meridian on its own schedule. Ask that they appear as a line rather than being absorbed, so you can see them.
• Maintenance. A wood deck wants cleaning and re-coating every two to four years here. On a 400 square foot deck that is $1,400 to $3,200 each time, which over twenty years is a real part of the comparison against composite.

Getting a number for your own yard

The cost estimator puts your footprint, material, height, and rail choice together into a range in about thirty seconds. For the real figure, a builder measures the yard and writes it down. That measure and that written price are free, and they are the only numbers on this page that apply specifically to your house.