Composite Deck costs $45.57 to $96.84 per sq ft in Kahului in 2026. For a 400 sq ft project, expect $18,230 – $38,738 installed, typically near $28,484. That is about 2% above the Hawaii average.
Kahului composite deck calculator
Planning estimate. Wage index applies to the labor share only; materials held at national prices. Get three written quotes.
Why Kahului runs above the Hawaii average
Construction wages in Kahului average $41.87 per hour against $40.48 statewide, so labor-heavy work prices above the Hawaii norm here.
Labor is about 42% of the installed cost on this type of work, and it is the part that actually moves between markets. Materials are priced by national manufacturers and barely shift, which is why the gap between metros is narrower than wage differences alone suggest.
Composite Deck cost by project size in Kahului
| Project size | Kahului range | Typical |
|---|---|---|
| 100 sq ft | $4,557 – $9,684 | $7,121 |
| 200 sq ft | $9,115 – $19,369 | $14,242 |
| 300 sq ft | $13,672 – $29,053 | $21,363 |
| 400 sq ft | $18,230 – $38,738 | $28,484 |
| 600 sq ft | $27,344 – $58,107 | $42,726 |
| 800 sq ft | $36,459 – $77,476 | $56,968 |
| 1,000 sq ft | $45,574 – $96,845 | $71,210 |
| 1,500 sq ft | $68,361 – $145,267 | $106,814 |
Where the money goes
For a 400 sq ft project in Kahului at roughly $28,484, a typical bill splits like this:
| Line item | Share | Cost |
|---|---|---|
| Labor | 42% | $11,963 |
| Materials | 44% | $12,533 |
| Site prep & equipment | 8% | $2,279 |
| Overhead, disposal & finishing | 6% | $1,709 |
Kahului compared with other Hawaii markets
| Area | Cost per sq ft | vs Kahului |
|---|---|---|
| Honolulu | $44.97 – $95.56 | −1% |
| Hawaii average | $44.84 – $95.28 | −2% |
Ground conditions and code in Kahului
Permits in Kahului
A residential permit for this work typically runs around $950 in Hawaii. Permit cost is rarely included in a contractor quote, so budget it separately and confirm scope with the Kahului building department before work begins.
Hiring in Kahului
Get three written, itemised quotes from licensed and insured contractors, each specifying the same scope and grade of material. Ask for local references and check the licence is current in Hawaii.
Frequently asked questions
How much does composite deck cost in Kahului?
In 2026, composite deck costs $45.57 to $96.84 per sq ft in Kahului. For a 400 sq ft project, the installed total typically lands between $18,230 and $38,738.
Is Kahului more expensive than the rest of Hawaii?
Yes. Kahului runs about 2% above the Hawaii average, because local construction wages ($41.87/hr) sit above the statewide figure of $40.48/hr.
Do I need a permit in Kahului?
Most work of this type and value requires a permit. Budget around $950 in Hawaii and allow extra time for review in metro jurisdictions.
How do I compare quotes in Kahului?
Get three written, itemised quotes covering identical scope and materials. A bid far below the others usually signals a reduced specification rather than better value.
Nearby markets
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