Deck Cost in Missouri (2026)
Missouri labor 1.00× national. Mid-spectrum frost depth 24-30″. Frost depth 24″ drives footing depth per IRC R403.1.4. Permit baseline ~$175 (Midwest); actual fee scales with project value. MO permits $130-220.
Inputs
Dimensions
Plan-view length × width.
IRC R312 requires a 36″ guardrail above 30″.
192 sq ft · Mid composite · 1.00× labor · 1.10× complexity
Project advisories · IRC 2021
Guardrail included (deck 36″ off grade)
IRC R312IRC R312 mandates a 36″ guardrail on open edges when deck height exceeds 30″. 40 lf priced at Mid composite tier.
Building permit included in budget
IRC R105Midwest typical permit fee is in the budget. Most jurisdictions require a permit for decks > 200 sqft, > 30″ above grade, or attached to the house.
Hidden-fastener install premium baked in
Manufacturer specsMid composite uses hidden-fastener clip systems (Cortex / CamoClip / Trex Universal) — labor takes 25–30% longer than face-screwing PT. Already inside the tier's installed $/sqft band.
Cost breakdown
National-median pricing (2026-Q1). Local prices vary ±15%. Materials line uses Mid composite tier; switch tiers to repaint the budget. Includes 10% contingency reserve on the high estimate.
Visualize your deck
Photoreal 3D · plan view · framing breakdown. Color matches your tier selection.
Project all-in
Same dimensions, different tier
tap to switchDIY savings
- Materials only: $7,603
- Estimated hours: 288 hr
- Skill required: advanced
Finance estimate
- Principal: $25,120
- Total interest: $6,160
- Estimate only — shop 3+ lenders.
Need exact board counts?
The Deck Material Calculator gives you a permit-ready bill of materials — every joist, hanger, fastener, and footing — validated against IRC 2021 span tables.
Estimates use 2026-Q1 national-median pricing (Home Advisor, Angi, RSMeans). Expect ±15% variance vs your local market. Always get 3 contractor bids before signing. This calculator is not a substitute for a licensed inspector or structural engineer.
Building a deck in Missouri — what to know
Labor in Missouri runs 1.00× the national average (RSMeans 2026-Q1, Midwest region). Materials are roughly national-average since most decking products ship from regional distribution centers, so the 1.00× variance comes almost entirely from labor.
Frost depth: 24″ — your footings must extend below this depth per IRC R403.1.4 to avoid frost heave. This is moderate frost depth; budget for 4-5 ft of total footing depth (frost line + bearing layer).
Permit: MO permits $130-220.
Climate: Missouri's humid climate is hard on PT wood (mildew, slow drying after stain). Composite or PVC is the better long-term value.
FAQ — Deck Cost in Missouri
How much does a deck cost in Missouri?
In Missouri, expect $30-60/sqft installed for pressure-treated, $50-90 for mid-range composite, and $90-140 for premium composite or tropical hardwood. Labor in Missouri runs 1.00× the national average (Midwest region). A typical 16×20 (320 sqft) deck lands around $17,600-$24,000 for mid-tier composite.
What's the deck building permit fee in Missouri?
Missouri permit fees typically run $130-450 depending on jurisdiction and project value. Most calculators including DeckMath use the formula: max(regional baseline, 1.2% of project value).
How deep do footings need to be in Missouri?
Missouri's frost depth is approximately 24″. Footings must extend below the frost line per IRC R403.1.4 — verify with your local building department, since AHJs sometimes require deeper depths than the state-published value.
Do I need a deck contractor's license in Missouri?
Most Missouri jurisdictions require a contractor's license for projects above a state-specific threshold ($1,000-25,000). DIY construction by a homeowner on their own property is typically allowed. Always confirm with your local building department before signing a contract.