Composite vs wood deck cost: what the per-square-foot math hides

What to take away

What is actually being compared

Three product families reach most US residential decks: pressure-treated pine, western red cedar, and wood-plastic composite sold through distributors such as Trex, TimberTech and Fiberon. Each carries a different purchase price, a different install cost and a different maintenance bill over 20 years.

The comparison only works if you hold the deck size constant. A 16 by 20 foot deck is 320 square feet. Every figure below is stated per square foot of deck surface, installed, and excludes stairs, railing and pergola work.

The criteria that matter

Figures are illustrative ranges drawn from US supplier and contractor pricing, not a quoted bid. Regional labor rates move the installed column more than any board price does.

Option by option

Pressure-treated pine wins on day-one cash. A 320 square foot deck in pine can land near $6,000 in a lower-cost market and near $8,000 in a coastal one. The hidden cost is the refinish cycle. Two to three years between coats means roughly eight to ten cycles over 20 years, and each cycle carries sanding, cleaning and product.

Cedar behaves like pine with a longer clock. It takes stain well, resists rot without chemical treatment, and holds a premium look. The catch is supply. Cedar pricing swings with Pacific Northwest harvest volumes, so a quote written in spring can be stale by fall.

Composites remove the refinish line entirely. That is the whole product promise, and it is real. What buyers often miss is that composite still needs cleaning, and that the surface gets hot in full sun. Board cost is the highest of the three, and installed cost can reach $50 per square foot with hidden fasteners and a premium railing.

A deck estimate that shows only material cost per square foot is not an estimate. It is a board quote.

Where each one wins

Pine is the right answer for a rental property, a budget-capped rebuild, or a deck the owner plans to replace within ten years. The low entry price frees money for railing and lighting that the owner will actually notice.

Cedar is the right answer for a homeowner who wants natural wood and will pay for a longer refinish interval. It also suits regions where composite surface heat is a complaint, and where a stained cedar deck matches the house.

Composite is the right answer for a homeowner who will not maintain anything, or for a west-facing deck where refinishing is a losing fight. It also suits sellers who want a warranty to transfer at closing. If your crew needs to know who is qualified to install each system, see the employee training checklist.

What none of them solve

Every option shares one limit: the substructure. Footings, ledger attachment, flashing and framing are code-driven and material-independent. A $50 per square foot composite deck on a bad ledger fails the same way a pine deck does.

That risk is also a safety obligation. Crews working on an unfinished frame face fall exposure, and OSHA sets the duty at six feet or more above a lower level under 1926.501. Guardrail and arrest system detail sits in 1926.502.

Example: the 20-year number

Take the 320 square foot deck. Pine at $18 installed runs about $5,760, plus $10 per square foot of upkeep across two decades, or $3,200. Total near $8,960.

Composite at $38 installed runs about $12,160 with almost no upkeep. Cedar at $28 installed runs about $8,960 plus roughly $2,500 in refinishing, near $11,460.

Pine and cedar land close together over 20 years. Composite costs more up front and less later. The crossover depends on how long the owner stays.

Common questions

Does composite always cost more than wood over 20 years?

No. On a long hold with no owner maintenance, composite can come out ahead of cedar. Against pine in a low-labor market, pine usually stays cheaper.

Why does installed cost vary so much between states?

Labor rates, permit fees and inspection timelines drive the spread. Material is a smaller share of the total than most homeowners expect. A quote template with pricing examples helps you show both columns clearly.

What happens to pressure-treated pricing in 2027?

No one can promise a number. Treated lumber tracks framing lumber, which moves with mills, tariffs and building season demand. Quote valid for 14 to 30 days and say so in writing.

Can a homeowner mix materials?

Yes. Composite surface with pressure-treated framing is common, and cedar railing over composite boards happens often. Confirm the fastener system is compatible with both before you order.