Deck Building Cost in Portland, ME (2026)
Updated October 2026 · Portland, ME · index 1.03
How much does it cost to build a deck in Portland? For a 300 sq ft deck with pressure-treated wood, homeowners in Portland, ME pay about $11,600 on average, and most quotes land between $8,000 and $15,200 — $27 to $51 per sq ft. The price covers plans and the permit, footings, a framed and flashed structure, the deck boards, railing, one set of stairs, fascia and cleanup.
The deck building price in Portland runs 3% above the U.S. average: construction labor in the Portland area runs 3% above the national mean, materials 2% above. The same job averages $11,300 nationally and about $11,000 at the Maine statewide index.
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Deck building price in Portland by decking material
What a 300 sq ft deck costs in Portland with each decking material, installed:
| Option | Average · range |
|---|---|
| Pressure-treated woodtreated pine or fir boards, stained and sealed$39 per sq ft | $11,600$8,000 – $15,200 |
| Capped compositehidden fasteners and a picture-frame border$46 per sq ft | $13,900$9,900 – $17,900 |
The least expensive option in Portland is pressure-treated wood, at about $11,600; capped composite averages $13,900, 1.2 times as much.
Cost to build a deck in Portland by size
With pressure-treated wood, priced for Portland, ME:
| Size | Average · range |
|---|---|
| A 200 sq ft deck$42 per sq ft | $8,350$5,700 – $11,000 |
| A 300 sq ft deck$39 per sq ft | $11,600$8,000 – $15,200 |
| A 400 sq ft deck$37 per sq ft | $14,800$10,300 – $19,400 |
Some costs stay the same whatever the size — plans, permit and layout, one set of stairs (4 steps), final inspection and cleanup — so a bigger job costs less per unit: $37 per sq ft for a 400 sq ft deck against $42 for a 200 sq ft deck.
What a deck building in Portland includes
Line by line, the $11,600 average for a 300 sq ft deck breaks down like this: 47% labor, 53% materials and equipment.
| Line | Low – high |
|---|---|
| Plans, permit and layout | $380 – $1,150 |
| Ground prep, fabric and gravel | $230 – $570 |
| Footings below the frost line | $430 – $850 |
| Flashed ledger on the house | $260 – $500 |
| 6x6 posts | $280 – $570 |
| Beams | $260 – $500 |
| Joist framing with hangers | $1,500 – $2,500 |
| Deck boards | $1,350 – $2,050 |
| One set of stairs (4 steps) | $530 – $1,050 |
| Railing | $1,950 – $3,350 |
| Fascia and skirting | $370 – $890 |
| Final inspection and cleanup | $150 – $380 |
| Stain and seal, two coats | $340 – $800 |
Each line is the price book's U.S. rate for that step, scaled by 0.74 to the installed price published sources give for the whole job (see how these prices are built), times Portland's index of 1.03; permit fees are not scaled.
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What affects deck building prices in Portland
Labor and materials in Portland
Construction wages in the Portland metro run right at the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 3%, to 3% above the national mean. Materials in the area's ZIP codes price 2% above the national average. Together they give Portland a construction cost index of 1.03.
Where Portland sits in Maine
Portland is the most expensive of the 4 Maine cities in our index, against a statewide index of 0.98. Bangor is the least expensive at 0.92.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Portland ranks 131st from the most expensive. The job that averages $11,600 here averages $11,300 at the national rate.
The deck code in Maine
Decks here are built to the Maine Uniform Building and Energy Code — MUBEC (2021 IRC with Maine amendments). Guards are required at 36 in. where the deck is more than 30 in. up, and stair risers can be up to 7.75 in. Maine fills in no statewide design table: the town sets the frost depth (48 in. on the coast, 60 in. inland around Bangor), the snow and the wind.
What decks are built of in Maine
Most used on decks in New England: treated pine, then capped composite, then PVC.
Sales tax in Maine
Maine's base state sales tax is 5.5%, and cities and counties can add their own. How it applies to a home-improvement contract varies, so ask whether a quote includes it. Prices on this page are before tax.
What a Portland contractor will ask before quoting
- Reuse the frame or rebuild?
- Height, railing style and stairs
- Board brand and color
Deck building cost in other Maine cities
A 300 sq ft deck with pressure-treated wood averages $11,600 in Portland; $10,400 in Bangor, $10,800 in Lewiston, $10,800 in Augusta.
| City | Average · range |
|---|---|
| Bangor, ME11% less | $10,400$7,150 – $13,500 |
| Lewiston, ME7% less | $10,800$7,450 – $14,100 |
| Augusta, ME7% less | $10,800$7,450 – $14,100 |
deck building price in Portland: questions
How much does it cost to build a deck in Portland, ME?
About $11,600 for a 300 sq ft deck with pressure-treated wood, and most Portland quotes fall between $8,000 and $15,200. That is 3% above the U.S. average, where the same job averages $11,300.
What is the deck price per square foot in Portland?
$27 to $51 per sq ft, about $39 on average with pressure-treated wood. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 400 sq ft deck in Portland?
$10,300 to $19,400, about $14,800 on average, with pressure-treated wood — $37 per sq ft.
Do you need a permit for deck building in Portland?
Yes — a new deck needs a permit nearly everywhere, Portland included. In Maine, decks follow the Maine Uniform Building and Energy Code — MUBEC (2021 IRC with Maine amendments). The prices on this page carry $380–$1,150 for plans, permit and layout.
Does the price include sales tax in Maine?
No. The prices here are before tax; Maine's base state rate is 5.5%, plus any local rate.
What decking do people choose in Maine?
Most used on decks in New England: treated pine, then capped composite, then PVC.
Other home projects in Portland
Deck building cost in Maine
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The deck building is priced step by step, then multiplied by Portland's construction cost index of 1.03.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: pressure-treated wood × 0.74 (HomeGuide 2026: $25–$50 per sq ft); capped composite × 0.80 (Ergeon 2026: $30–$60 per sq ft).
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Portland, each on its own base: RSMeans residential 0.97, HUD 1.00, Craftsman 1.04. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Portland build quotes like these with JobFlex's Deck Studio.
- HomeGuide 2026: pressure-treated deck $25-$50/sqft installed, labor $15-$30/sqft
- Ergeon 2026: composite deck $30-$60/sqft installed
- HomeGuide 2026: composite railing $25-$60/lf, aluminum $50-$200/lf installed