Deck costs in 2026 — actual contractor bid data
Pressure-treated lumber pricing finally normalized after the 2021-2022 lumber spike; PT 2x6 decking boards run $1.85-$2.40 per linear foot in 2026, about 12% below the peak. Composite decking from Trex, TimberTech, and Fiberon held price increases to 3-5% year-over-year. A 300 sq ft deck (a standard 12x25) installs for $6,000-$10,500 in pressure-treated pine, $12,000-$18,000 in composite, and $13,500-$22,500 in tropical hardwood — all with basic railings and one set of stairs.
Regional variation runs 20-30%. Deck builds in Raleigh or Atlanta hit the low end; Boston, Seattle, and Bay Area deck builds add 25-35% because of labor rates and permit costs. DIY saves roughly 40% of total cost but takes 3-6x the time and requires the same permits and inspections.
Reading a deck bid
Legitimate deck bids itemize seven lines: decking boards (brand, grade, square footage), framing lumber (joists, beams, ledger, rim), footings (number, depth, diameter), posts (4x4, 6x6, steel column), railings (linear feet, baluster type, top rail material), stairs (number of steps, treads, stringers), and labor with crew size. Lump-sum bids hide whether your builder is using code-minimum framing or proper 16-inch on-center joist spacing with hurricane ties.
Permit and structural reality
Every attached deck requires a building permit — no exceptions worth taking. Inspectors verify: (1) footings extend below local frost depth (varies 12-48 inches); (2) ledger board is flashed and bolted through rim joist, not nailed; (3) joist spans don't exceed code tables for the lumber grade; (4) railings are 36 inches high with 4-inch max baluster gaps; (5) stair stringers have proper rise/run ratio. Failed attachments are the most common deadly deck failure mode — the ledger pulls away from the house under load because someone nailed instead of bolted.
Pressure-treated vs composite — the true 25-year math
PT pine is cheaper to build and more expensive to own. Over 25 years on a 300 sq ft deck: build cost $8,500, staining every 3 years at $400 each (8 times = $3,200), replacement at year 18-20 averaging $4,000-$6,000 in prorated cost. Total: $15,700-$17,700. Composite: build cost $15,000, annual wash $50 ($1,250 over 25 years), no replacement needed. Total: $16,250. Composite pulls ahead on labor saved alone — 2-3 weekend days per year of staining vs an hour of washing.
Contractor vetting for deck builders
Deck contractors are often general carpenters without structural training. Check:
- State contractor license with carpentry or residential classification.
- $1M general liability insurance and current workers comp.
- Three completed deck references from the past 18 months — walk one and look at the ledger attachment.
- NADRA membership (North American Deck and Railing Association) is a plus but not required.
- Written bid with specific lumber grade, hardware type (galvanized vs stainless), and fastener brand.
- Payment schedule: 10% deposit, draws at footings/framing/completion, 10% final holdback.
Hidden costs most homeowners miss
Four cost adders routinely surprise first-time deck builders. First: stairs are disproportionately expensive at $150-$250 per step because of stringer cuts and railing transitions. Second: height off grade compounds cost — a deck 6 feet up needs engineered 6x6 posts, diagonal bracing, and often a building permit plan review. Third: aluminum or cable railing looks modern but adds $40-$80 per linear foot over PT railing. Fourth: existing deck removal runs $800-$2,500 for demo and hauling before the new build even starts.