Deck Building Cost Guide
Deck quotes vary widely because size, material, footing requirements, and railing style all move the final number. Use this guide to understand the ranges and compare bids on equal footing.
Typical deck cost by size and material
Pressure-treated lumber
| Deck size | Typical range | Notes |
|---|---|---|
| 100 sq ft (10x10) | $2,500 – $5,000 | Basic single-level, simple railing |
| 200 sq ft (10x20) | $4,500 – $9,000 | Most common starter deck size |
| 400 sq ft (20x20) | $8,500 – $17,000 | Full outdoor entertaining footprint |
| 600 sq ft (20x30) | $12,000 – $24,000 | Large deck; stairs usually required |
Composite decking (e.g., Trex, TimberTech)
| Deck size | Typical range | Notes |
|---|---|---|
| 100 sq ft | $4,500 – $8,500 | Low-maintenance; no annual sealing |
| 200 sq ft | $8,500 – $16,500 | Most popular composite size range |
| 400 sq ft | $16,000 – $32,000 | Premium composite adds cost quickly |
| 600 sq ft | $23,000 – $46,000 | Large footprint; high-end composites at top |
Cedar decking
| Deck size | Typical range | Notes |
|---|---|---|
| 100 sq ft | $3,500 – $7,000 | Natural look; requires periodic sealing |
| 200 sq ft | $6,500 – $13,000 | Mid-tier on cost and maintenance |
| 400 sq ft | $12,500 – $25,000 | Cedar grades vary significantly in price |
| 600 sq ft | $18,000 – $36,000 | Premium grades approach composite cost |
Ranges reflect national averages. Regional labor rates, local lumber prices, and site conditions all shift the final number. Use the deck cost calculator with your specifics for a closer estimate.
Labor cost breakdown
| Work type | Typical cost | Notes |
|---|---|---|
| Labor (total installed) | $15 – $35 / sq ft | Varies by region and complexity |
| Footings / concrete piers | $150 – $500 each | Frost depth drives footing cost |
| Ledger board attachment | $200 – $600 | Flashing and fastener detail matters |
| Railing (linear foot) | $35 – $120 / LF | Cable and glass rail at the high end |
| Stairs (per step) | $75 – $200 | Material choice affects this range |
| Permit | $200 – $1,200 | Varies significantly by municipality |
| Demo / haul-away (existing) | $500 – $2,500 | If replacing an old deck |
What changes the price most
- Deck size and shape (rectangular vs. multi-level or wrap-around)
- Decking material (pressure-treated vs. cedar vs. composite)
- Footing type and depth (local frost line requirements)
- Railing style (basic pressure-treated vs. cable, aluminum, or glass)
- Stairs and built-in seating or planters
- Site access and slope (hillside or elevated decks cost significantly more)
- Demo of existing deck or structure
Questions to ask every deck contractor
- Will you pull the permit, or is that on me?
- What is the footing design and depth for my frost line?
- Exactly which decking brand and grade are you pricing?
- What railing system is included and what are upgrade costs?
- Is demo and haul-away of my existing deck included?
- What warranty do you provide on workmanship vs. materials?
- How do you handle ledger flashing and waterproofing?
Pressure-treated vs. composite vs. cedar
Pressure-treated lumber
- Lowest upfront cost — 40–60% less than composite
- Requires annual cleaning and sealing/staining to prevent cracking and graying
- Lifespan: 15–25 years with proper maintenance
- Most widely available; easiest to repair
Composite (Trex, TimberTech, Fiberon, etc.)
- Highest upfront cost but lowest long-term maintenance
- No sealing, staining, or sanding required
- Lifespan: 25–30+ years; most brands include transferable warranties
- Wide range of grades and prices — confirm the specific product line in your quote
Cedar
- Natural appearance; resists rot and insects without chemical treatment
- Requires periodic sealing or oil finishing to maintain color
- Lifespan: 15–25 years depending on maintenance and climate
- Regional availability affects pricing significantly
Scope checklist (ask for this in writing)
- Deck square footage and overall dimensions
- Decking material brand, product line, and color
- Footing type, number of footings, and depth
- Ledger attachment method and flashing specification
- Railing type, linear footage, post spacing, and material
- Stair location, number of steps, and material
- Permit: who pulls it and who pays the fee
- Demo and haul-away (if replacing existing deck)
- Cleanup and final inspection process
- Warranty: labor vs. materials, and duration
Red flags to watch for
- Contractor says no permit is needed without confirming with your municipality
- Vague quote that doesn't specify decking product line or railing detail
- No mention of ledger flashing — water infiltration behind the ledger is a top cause of deck failure
- Large deposit request (over 30–40%) before materials are ordered
- Missing footing depth specification — underpowered footings fail in cold climates
Frequently asked questions
How much does a 12x16 deck cost?
A 12x16 deck (192 sq ft) typically costs $4,500–$9,500 for pressure-treated wood, $8,000–$17,000 for composite, or $7,000–$14,500 for cedar. The range reflects material, footing type, railing style, and local labor rates.
What is the cheapest decking material?
Pressure-treated lumber is the least expensive decking material, typically 40–60% cheaper than composite per board foot. It requires annual maintenance (sealing or staining) to stay looking good, while composite is low-maintenance but has a higher upfront cost.
Do I need a permit to build a deck?
Most jurisdictions require a building permit for decks above a certain height (commonly 30 inches) or square footage. Always confirm with your local building department before starting. A contractor who says you don't need one without checking is a red flag — permit fees are modest and protect your home sale value.
How long does composite decking last compared to pressure-treated?
Quality composite decking typically lasts 25–30+ years with minimal maintenance. Pressure-treated wood can last 15–25 years if properly maintained with regular cleaning and sealing. The higher upfront cost of composite often evens out over a 20-year ownership window once maintenance costs are factored in.
Can I save money by building a deck myself?
DIY deck building is feasible for experienced homeowners but requires permits, proper footing depth for local frost lines, and correct ledger board attachment — all of which affect structural safety and home insurance. Labor typically accounts for 40–50% of a deck quote. If you pull your own permits and do most of the framing, savings can be significant, but structural and ledger work often warrants professional involvement.
Use the deck cost calculator → then request quotes to compare real bids.