Composite deck cost in Napa, CA
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $14,600 – $29,200
- Per sq ft
- $48.50 – $97
- before permit
- Versus US midpoint
- +21%
- US $18,100
- Rank of 300 metros
- #7
- 1 = most expensive
A composite deck in Napa, CA usually costs $14,600 to $29,200 for 300 sq ft. That works out to about $48.50 to $97 per sq ft before permits. Compared with the national midpoint that is $3,800 more. Carpenters earn a median of $38.75 an hour in the Napa area, 33% above the US median of $29.12.
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Estimated cost for 300 sq ft in Napa, CA, standard level
$19,000 to $24,900
About $63 to $82.50 per sq ft before permits. Labor is about 65% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $6,550 | $8,600 |
| Labor | $12,300 | $16,100 |
| Permits and fees | $90 | $140 |
| Total | $19,000 | $24,900 |
Cost breakdown for 300 sq ft in Napa, CA
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $5,050 | $7,550 | $10,100 | 35% |
| Labor | $9,500 | $14,200 | $19,000 | 65% |
| Permits and fees | $55 | $110 | $170 | 1% |
| Total | $14,600 | $21,900 | $29,200 | 100% |
What is behind the Napa number
We price the labor side from BLS wage data for 2 trades: carpenters at 80%, construction laborers at 20%. Weighted together, Napa wages are 1.32 times the national level. Labor makes up about 65% of the midpoint estimate (60% at national prices).
Materials are scaled with BEA's regional price parity for goods. Napa is at 105.2 against 100 for the US, so a materials line of $7,200 nationally becomes $7,550 here (midpoint, 300 sq ft). Permits follow the all-items index of 112.6: $55 to $170.
What local crews earn in Napa
The labor line is built from BLS wage data, one trade at a time. This job draws on 2 trades. We compare each trade's local median with the US median, weight the ratios by how much of the job each trade does, and apply the blend to the national labor cost. For Napa the blend is 1.32.
Carpenters (47-2031), 80% of the weighting: a median of $38.75 an hour, 33% above the US median of $29.12. The middle half of them earn between $30.44 and $46.96 an hour. About 650 work in the metro. That is 83.5 per 10,000 jobs, compared with 43.1 nationally, which suggests plenty of local crews to bid.
For construction laborers (47-2061, weighted 20%) the local median is $28.75 an hour, which is 27% above the national $22.66. The middle half of them earn between $23.80 and $36.35 an hour. BLS counts 540 of them working in the area, 69.4 for every 10,000 jobs (US: 70.5), so the local bench is about average.
A quick sensitivity check: moving the lead trade (carpenters) from the median to the 75th percentile wage adds about $2,450 to the midpoint estimate; the 25th percentile takes off about $2,450. That is a swing of roughly 11.2% to 11.1% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Napa has 77,860 jobs in total (BLS, May 2025), ranking 242nd by size among the 300 metros on this site.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 80% | $30.44 | $38.75 | $46.96 | $29.12 | 1.33 | metro |
| Construction laborers (47-2061) | 20% | $23.80 | $28.75 | $36.35 | $22.66 | 1.27 | metro |
| Blended | 100% | 1.32 | |||||
Napa weather and the composite deck calendar
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Napa State Hospital (5 miles from the city center). They are 30-year averages, so any one year can run hotter, colder or wetter.
Weather is not a serious constraint for exterior installation in Napa: no month in the averages is cold enough (an average daytime high under 45°F) or hot enough (an average daytime high of 90°F or more) to rule it out, so the workable window is all year.
Napa gets about 27 inches of precipitation in a normal year. The wettest months are January, February and December (5.5 inches in December). The station averages about 33 days a year at 90°F or above.
We do not adjust the estimate by month, because we have no reliable published data on seasonal pricing. It is still worth asking contractors whether an off-peak start date changes their bid.
| Month | Avg high °F | Avg low °F | Precip (in) | For this job |
|---|---|---|---|---|
| Jan | 59 | 40 | 5.0 | Workable |
| Feb | 63 | 42 | 5.1 | Workable |
| Mar | 68 | 44 | 3.7 | Workable |
| Apr | 72 | 46 | 1.7 | Workable |
| May | 77 | 50 | 1.1 | Workable |
| Jun | 82 | 54 | 0.3 | Workable |
| Jul | 83 | 56 | 0.0 | Workable |
| Aug | 84 | 56 | 0.1 | Workable |
| Sep | 84 | 53 | 0.1 | Workable |
| Oct | 78 | 49 | 1.3 | Workable |
| Nov | 66 | 44 | 2.8 | Workable |
| Dec | 59 | 40 | 5.5 | Workable |
Add-ons priced for Napa
Add-ons start from national price ranges and are scaled by 1.18 for Napa, which is the average of the area's wage index (1.32) and goods price index (1.05). The estimator above can add them to your total.
| Add-on | Local range |
|---|---|
| Add a deck railing (approx. 0.3 ft per sq ft) | $2,150 – $6,400 |
What nearby projects cost in Napa
Jobs that often go together with composite deck are priced below at their usual sizes, using the same Napa wage and price inputs. Compared with national midpoints, concrete patio comes out highest (+19%) and gutters lowest (+12%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Wood deck | 300 sq ft | $8,800 – $17,700 | +17% |
| Concrete patio | 300 sq ft | $1,450 – $4,800 | +19% |
| Paver patio | 300 sq ft | $3,450 – $6,300 | +15% |
| Gutters | 160 linear ft | $1,450 – $4,700 | +12% |
Napa: what basic, standard and premium work costs
The cited range is split into basic, standard and premium bands, then scaled to Napa. Bands overlap, because plenty of standard jobs cost as much as a light premium one. Sizes run from 10x12 (120 sq ft) to 20x20 (400 sq ft).
Basic
$14,600 to $20,500
Entry-level composite boards, low deck, simple shape
Standard
$19,000 to $24,900
Mid-grade capped boards with railing and stairs
Premium
$23,400 to $29,200
Premium capped or PVC boards, multi-level, hidden fasteners
| Size | Basic | Standard | Premium |
|---|---|---|---|
| 10x12 (120 sq ft) | $5,850 – $8,250 | $7,650 – $10,000 | $9,450 – $11,800 |
| 12x12 (144 sq ft) | $7,050 – $9,850 | $9,150 – $12,000 | $11,300 – $14,100 |
| 16x20 (320 sq ft) | $15,600 – $21,800 | $20,300 – $26,500 | $24,900 – $31,200 |
| 20x20 (400 sq ft) | $19,400 – $27,200 | $25,300 – $33,100 | $31,100 – $38,900 |
Composite deck: what moves the price in Napa
Labor
Labor for composite is $24-$48 per sq ft, higher than wood because the boards need extra parts and more careful assembly.
Drainage
Ground-level decks over poorly draining yards may need $1,000-$4,000 of drainage work first.
Engineering
Large or complex decks may need a structural engineer at $100-$220 an hour to get a permit.
Napa against nearby metros and the rest of California
Contractors rarely work more than an hour or two from home, so the neighboring metros set a rough ceiling and floor for your quotes. Midpoints for 300 sq ft range from $20,200 to $24,000 across Napa and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Napa, CAthis page | $14,600 – $29,200 | $21,900 | |
| Vallejo, CA25 miles | $14,300 – $28,600 | $21,400 | −2% |
| Santa Rosa, CA30 miles | $14,600 – $29,300 | $21,900 | level |
| San Francisco, CA50 miles | $16,000 – $32,000 | $24,000 | +9% |
| Stockton, CA70 miles | $13,400 – $26,900 | $20,200 | −8% |
| Sacramento, CA75 miles | $14,000 – $28,100 | $21,100 | −4% |
| California (statewide) | $14,200 – $28,500 | $21,300 | −3% |
| United States | $12,100 – $24,200 | $18,100 | −17% |
Out of the 300 metros we cover, Napa ranks #7 for the cost of this job (#1 is the most expensive). Statewide, Napa is 3% above the California figure.
Elsewhere in California
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Los Angeles, CA | 6,271,560 jobs | $14,200 – $28,400 | $21,300 | −3% |
| San Francisco, CA | 2,373,920 jobs | $16,000 – $32,000 | $24,000 | +9% |
| Riverside, CA | 1,716,760 jobs | $13,500 – $27,000 | $20,200 | −8% |
| San Diego, CA | 1,538,060 jobs | $13,900 – $27,900 | $20,900 | −4% |
| San Jose, CA | 1,134,970 jobs | $14,800 – $29,700 | $22,300 | +2% |
| Sacramento, CA | 1,080,590 jobs | $14,000 – $28,100 | $21,100 | −4% |
Metros of a similar size
Big cities and small ones price differently, so here is Napa against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Chico, CA | 78,220 jobs | $13,600 – $27,300 | $20,500 | −7% |
| Racine, WI | 76,280 jobs | $12,000 – $24,100 | $18,000 | −18% |
| Merced, CA | 79,510 jobs | $13,900 – $27,800 | $20,800 | −5% |
| Warner Robins, GA | 76,050 jobs | $10,300 – $20,700 | $15,500 | −29% |
Get 3 local quotes
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Composite deck in Napa: your questions
+How much does it cost to build a composite deck in Napa?
For 300 sq ft, expect $14,600 to $29,200 in the Napa area. A standard-spec job lands at $19,000 to $24,900. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for composite deck in Napa?
About $48.50 to $97 per sq ft for materials and labor, plus $55 to $170 for the permit if one is needed. The US range is $40 to $80.
+Is composite deck cheaper in Napa or Vallejo?
Vallejo is 25 miles away. The midpoint for 300 sq ft there is $21,400, which is 2% less than Napa ($21,900). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Napa?
About 65% at the midpoint, or $14,200 out of $21,900. Materials are 35% and permits 1%. Nationally, labor is 60%.
+What would 16x20 (320 sq ft) cost in Napa?
$15,600 to $31,200. Pick a different size in the estimator above to get your own number.
+Does composite deck need a permit in Napa?
Often, but rules are set by your city or county building office, so call before you hire. Budget $55 to $170 for fees in the Napa area (our national range of $50 to $150 scaled by the local price level).
+Is Napa expensive for composite deck compared with the rest of California?
Napa is 3% above the California statewide estimate ($21,300 at the midpoint). We cover 23 metros in California; see the state page to compare them.
+What do carpenters earn in Napa?
The BLS median is $38.75 an hour in the Napa area, compared with $29.12 nationally. The 25th to 75th percentile range is $30.44 to $46.96.
+What do basic and premium composite deck work cost in Napa?
For 300 sq ft, basic work runs $14,600 to $20,500 and premium work $23,400 to $29,200. Basic means: entry-level composite boards, low deck, simple shape. Premium means: premium capped or PVC boards, multi-level, hidden fasteners.
+Is there a bad season to build a composite deck in Napa?
Not from a temperature point of view. NOAA's 1991-2020 normals show no month with a freezing-level overnight low or a 90°F-plus average high, so timing is mostly about contractor availability and rain.
+What does "add a deck railing" add in Napa?
$2,150 to $6,400 for 300 sq ft, from a national range scaled by the local wage and goods indexes.
Composite deck near Napa
Where these numbers come from
Base prices are national ranges from the sources below. We scale labor by local BLS wages, materials by BEA goods prices and permits by the BEA all-items price level. Full method on the methodology page.
- HomeGuide: How Much Does Composite Decking Cost? (2026) (accessed November 4, 2026)
- HomeGuide: 2026 Building Permit Costs | Fees & Cost Calculator (accessed November 4, 2026)
- BLS Occupational Employment and Wage Statistics, May 2025
- BEA Regional Price Parities, 2024
- NOAA NCEI U.S. Climate Normals, 1991-2020