Cost to build a 120 sq ft deck in Hawaii
| Typical total$39 per ft² of deck | $4,685 |
|---|---|
| Range you should see in bidsthree bids on the same scope normally land inside this | $3,549 – $7,099 |
| Labor portion55% of the job — this is the part that moves by state | $2,577 |
| Material portion45% — bought at national prices | $2,108 |
| Carpenters pay in Hawaiiabout $42/hr · BLS OEWS May 2025, SOC 47-2031 | $87,480/yr |
| U.S. mean for the same tradeSOC 47-2031 | $65,630/yr |
| Versus the national priceHawaii trade pay runs +33.3% against the U.S. mean | +$725 |
Notes
- **Where the number comes from.** The national price for a pressure-treated deck build is $33 per ft² of deck — pressure-treated deck pricing published for 2026, $25–$50 per ft² installed. Labor is about 55% of that. Carpenters in Hawaii average $87,480 a year against a U.S. mean of $65,630 — a factor of 1.333 — so the labor half is scaled by that and the material half is not.
- **What is in the price:** footings, framing, pressure-treated decking, fasteners, a code-compliant railing, and labor.
- **What is not:** stairs beyond two steps, permits, ledger repair on the house, and any grading work. These are the lines that turn a $4,685 quote into a $5,856 invoice, so ask about each one before signing.
- **Why state matters more than people expect.** Materials ship at national prices; crews do not move. Hawaii sits above the national mean by 33.3%, which lands on 55% of the job and moves the total by $725.
- **Use this as a bid check, not a quote.** It prices an average job in an average condition. Steep access, a second story, a tear-off of two layers, or a crew booked out three months all move the real number, and none of them are in a per-unit average.
A 120 sq ft deck in Hawaii
$4,685 is the typical figure, and bids on the same scope normally land between $3,549 and $7,099.
That is 120 ft² of deck at $39 each.
Why this is not the national number
The same job priced at the U.S. average comes to $3,960 — this one is $725 more.
The reason is one number, and it is a published one. Carpenters in Hawaii average $87,480 a year against a U.S. mean of $65,630, from the Bureau of Labor Statistics OEWS release for May 2025, SOC 47-2031. That is roughly $42 an hour of trade pay, a factor of 1.333, or +33.3% against the national mean.
Labor is about 55% of this job. Material is the other 45%, and material does not care what state it is nailed down in — a pallet costs what a pallet costs. So only the labor half is scaled here, and the material half is left at national pricing.
That is the whole model, and it is deliberately simple enough to check: $2,577 of labor, $2,108 of material.
What is in this price
Footings, framing, pressure-treated decking, structural fasteners, a code-compliant railing, and labor.
What is not
Stairs past two steps price per stringer and rise. Permits and inspection are separate almost everywhere, and a deck attached to the house needs both. Ledger repair — the flashing and rim board where the deck meets the house — is the one that hides until demolition, and it is also the one that causes deck collapses.
Where composite changes the sum
Swapping pressure-treated boards for composite raises the material half, not the labor half. Framing, footings and hours barely move. So on a 120 sq ft deck in Hawaii, expect the jump to land on $2,108, not on the total, which is why the percentage increase is smaller than the board price suggests.
How to use this against a real bid
Three quotes on identical scope should cluster. One well under $3,549 usually means something was left out of the scope rather than found cheaper — read what is excluded before reading the total. One well over $7,099 is either a harder job than average or a crew that does not want the work and priced accordingly.
The number above prices an average job in average condition. Access, story height, season, and how booked the crew is all move it, and none of those live in a per-unit average.
Nearby sizes
Read more
- Hidden Deck Fasteners or Face Screws: Cost, Speed, and the Repair ProblemHidden fasteners cost roughly three times as much and look better. The question that decides it is what happens when one board in the middle needs to come out.
- Cost to Replace Deck Boards Only: When Resurfacing Beats RebuildingResurfacing saves roughly half the cost of a rebuild, provided the frame underneath has more life left than the boards you are about to screw to it.
- Deck Screws per Square Foot: The Count, the Length, and the Coating That MattersRoughly 350 screws per hundred square feet at standard spacing — and the coating rating matters more to the deck's life than the count does.
- Deck Board Gap: Why Wet Lumber and Composite Need Opposite NumbersThere is no single correct gap. There is a correct gap for a board that is going to shrink and a different one for a board that is going to grow.