Composite Decking Cost Calculator
Plan a composite deck from platform area and board tier, then add a railing package, stairs, or demo of an existing wood deck.
Your project
Deck area (sq ft)iDeck area (sq ft) Measure the walking surface (length × width of the platform). Stairs and railing are handled as options, not floor area. | |
|---|---|
Composite board tieriComposite board tier Entry boards are basic capped composite. Mid is the common residential look. Premium adds deeper embossing and longer fade warranties. | |
Your stateiYour state Scales U.S.-average labor and material midpoints for typical state-level pricing. It is not an on-site bid. |
How to use this calculator
- Enter the deck platform area in square feet.
- Choose entry, mid, or premium composite board pricing.
- Toggle railing package, stairs, and old-deck demo.
- Select your state and review the installed midpoint.
Results explained
Board tier × deck area is the base (framing and install midpoints baked in). Railing and stairs are flat packages; demo scales with platform area.
Quick reference: composite deck midpoints
Installed U.S.-average midpoints before the selected state adjustment.
| Scope | Midpoint |
|---|---|
| Entry composite | $28/sq ft |
| Mid composite (default) | $38/sq ft |
| Premium composite | $52/sq ft |
| Railing package | $2,800 flat |
| Stairs package | $1,600 flat |
| Demo old deck | +$3.50/sq ft |
Rates are planning midpoints; difficult access, repairs, and minimum job charges can shift quotes.
How the estimate is built
Total ≈ (sq ft × board $/sq ft) + railing/stairs flats + (demo $/sq ft × sq ft), then × state multiplier. Brand-specific Trex SKUs are not modeled.
Example scenario
A 320 sq ft mid composite deck with railing is about $14,960 at U.S. average ($38 × 320 + $2,800).
FAQ
Is framing included?
These midpoints assume a typical framed composite install. Complex elevation changes or concrete piers can cost more.
Why a flat railing package?
Rail length varies by layout. A package midpoint keeps the tool simple; long wraparound rails may need a custom quote.
Can I compare wood decks here?
Use the deck building calculator for pressure-treated wood scopes; this page is composite-focused.