24×12 Deck Cost in Montana
A 24×12 (288 sqft) deck in Montana costs $18,432-$29,376 in mid-tier composite with the state's 1.28× labor multiplier (West). A 12×24 deck (288 sqft) is a long, runway-style deck — popular along long house elevations. Montana labor 1.28× national. Frost depth among the deepest in the US — footing cost dominates.
5 finish tiers — 24×12 in Montana
National $/sqft × Montana's 1.28× labor multiplier × 288 sqft = total installed cost. Materials + labor + standard railing included.
Excludes permit ($218-$537 typical in Montana), demolition (if replacing), and exceptional framing for 60″ frost depth. MT permits $150-280. Frost depth 60″ in northern MT.
24×12 framing notes for Montana
Montana considerations
Get a precise quote for your 24×12 deck in Montana
Open the Deck Cost Calculator with MT pre-selected and dial in your exact size, framing, material, and railing choices.
FAQ — 24×12 deck in Montana
How much does a 24×12 deck cost in Montana?▾
In Montana, a 24×12 (288 sqft) deck costs $9,216-$14,688 in pressure-treated, $18,432-$29,376 in mid-range composite (Trex Transcend / Fiberon Sanctuary), and $27,648-$40,608 in luxury composite/PVC (TimberTech AZEK / Trex Signature). Numbers reflect Montana's 1.28× labor multiplier on 2026-Q1 retail.
What's the cheapest way to build a 24×12 deck in Montana?▾
Cheapest = ground-level pressure-treated pine with no railings (where exempt under 30″ height) — ~$7,373-$11,059 in Montana. Add stairs + railings + above-grade framing and the build goes to ~$10,322-$14,746. DIY saves 30-50% on labor but requires permit + inspection coordination yourself.
How long does it take to build a 24×12 deck in Montana?▾
Permit timeline in Montana: 2-6 weeks depending on jurisdiction. Construction time for a 24×12: pro crew = 5-8 days for framing + boards + railings + stairs. DIY = 3-5 weekends for experienced DIYer. Allow extra time for permit approval + inspections.
What framing do I need for a 24×12 deck in Montana?▾
IRC R507-compliant framing for a 24×12 deck typically uses 2×8 joists at 16″ OC for spans up to 12 ft, 2×10 joists for spans 12-16 ft. Montana's frost depth is 60″ — footings must extend below that per IRC R403.1.4. Deep frost requires more concrete per footing — budget extra for sonotubes + concrete. Verify with your local building department.
Is composite worth it for a 24×12 deck in Montana?▾
Over 25 years in Montana: PT pine = ~$11,059 install + ~$23,040 maintenance (stain every 2-3 yr) = $34,099 total. Mid composite = ~$21,381 install + $0 maintenance = $21,381 total. Composite wins by 59-81% over 25-yr lifecycle PLUS better resale value in Montana's market.