Work out what it costs to build a deck on a mobile home. Enter the deck size, the material, the railing length, the stairs and the permit, then see your total build cost and the cost per square foot.
Formula: total build cost = (area x material rate) + (railing length x $65) + (stair flights x $750) + permit, where area = length x width.
A deck gives a mobile home an outdoor living space and a proper entry, but the cost depends on the size, the material and the extras, so a single price per square foot hides too much. This calculator breaks the build into its parts, so you see what the decking, the railing, the stairs and the permit each add.
Area = deck length x deck width. Deck cost = area x material rate. Railing cost = railing length x $65. Stair cost = stair flights x $750. Total build cost = deck cost + railing cost + stair cost + permit. Cost per square foot = total build cost / area. The material rates are installed mid-range rates from published 2026 ranges. Pressure-treated wood runs $15 to $25 a square foot installed, cedar runs $20 to $35, and composite runs $25 to $45. This calculator uses $20, $28 and $35, the middle of each range. Railing runs $48 to $88 a linear foot, so the calculator uses $65. Stairs run $475 to $1,150 a flight, so the calculator uses $750. A professionally installed deck costs roughly $30 to $60 a square foot overall once the extras are included.
A homeowner builds a 12 by 20 foot deck on a mobile home, in composite, with 40 feet of railing, one flight of stairs and a $250 permit.
As a second check, take a 12 by 12 foot deck in pressure-treated wood at $20 a square foot, with 30 feet of railing, one flight of stairs and a $150 permit. The deck cost is $2,880, the railing is $1,950, the stairs are $750, and the total is $5,730, which is $39.79 a square foot. The same steps work for any deck, so try your own numbers in the tool above.
Material is the biggest choice. On a 240 square foot deck, pressure-treated wood costs $4,800, cedar costs $6,720 and composite costs $8,400, so the material alone moves the total by $3,600. Size is the second driver, and it works in a straight line, because every extra square foot adds the material rate again. Railing is the part people forget. At $65 a foot, 40 feet of railing adds $2,600, which is more than a fifth of the worked example total. Stairs add $750 a flight, and a deck with two flights adds $1,500. Height matters too. A low, ground-level deck needs no stairs and little or no railing, while a raised deck needs both, plus footings and a permit. Mobile home decks are usually low and freestanding, which keeps them near the low end of the range, but a deck attached to the home or raised above 30 inches usually needs a permit and an inspection. Our deck cost calculator prices a standard deck the same way, from area, material and extras to a total you can compare with a contractor quote.
Pressure-treated wood is the cheapest to build, at $15 to $25 a square foot installed, and it lasts 10 to 15 years with yearly staining or sealing. It is the right pick when the budget is tight and you are happy to maintain it. Cedar costs $20 to $35 a square foot installed, lasts 15 to 20 years, and needs staining every two to three years. It looks warmer than pressure-treated wood and resists rot better. Composite costs $25 to $45 a square foot installed and lasts 25 to 30 years with only washing, no staining or sealing. It costs the most up front, and on a 240 square foot deck it adds $3,600 over pressure-treated wood, but it saves the yearly maintenance and it does not splinter, which matters for bare feet. The resale value is similar across materials, with a deck typically returning about half its cost when the home sells. Pick the material that fits how long you plan to stay and how much upkeep you want to do, not just the lowest build price. Our fence cost calculator uses the same per-foot math for a fence, so you can budget the yard work beside the deck.
Most places require a permit for a deck that is attached to the home or raised more than 30 inches above the ground. A low, freestanding deck at ground level often needs no permit, but the rule varies by county and by mobile home park, so check with the permit office before you build. The permit usually costs $100 to $400 and covers the inspection of the footings, the framing and the railing. Railings are required on any deck more than 30 inches high, and the railing must be at least 36 inches tall with gaps no wider than 4 inches. Stairs need a handrail, and the steps must be even, with a tread depth of at least 10 inches and a riser height of no more than 7 and three-quarter inches. If you live in a mobile home park, the park may have its own rules on deck size, materials and skirting, so get those in writing before you order materials. Get three quotes from licensed contractors and compare them with the tool above, using the same length, width, material, railing and stairs for each one. Our deck calculator works out the boards, joists and screws your deck needs, so you can check a contractor material list against it.
A professionally installed deck costs roughly $30 to $60 a square foot overall. In the worked example, a 12 by 20 foot composite deck with 40 feet of railing, one flight of stairs and a $250 permit costs $12,000, or $50 a square foot.
Pressure-treated wood costs $15 to $25 a square foot installed, cedar $20 to $35, and composite $25 to $45. On a 240 square foot deck that is $4,800 for pressure-treated wood, $6,720 for cedar and $8,400 for composite, before railing, stairs and permit.
Yes, usually, if the deck is attached to the home or raised more than 30 inches above the ground. A low, freestanding deck at ground level often needs no permit, but the rule varies by county and by mobile home park, so check with the permit office before you build.
Railing costs $48 to $88 a linear foot, and this calculator uses $65. At that rate, 40 feet of railing adds $2,600, which is more than a fifth of the worked example total. A low deck that needs no railing saves that whole amount.
It depends on how long you plan to stay and how much upkeep you want. Composite costs the most up front but lasts 25 to 30 years with only washing. Pressure-treated wood is cheapest to build but needs staining or sealing every year and lasts 10 to 15 years.
Yes, if the deck is low and freestanding and your local rules allow it. Building it yourself saves the labor cost, which is roughly half the installed price, but you still need the permit, the inspection and the right footings, so check the code rules first.
This is an estimate for planning. Actual deck costs come from local contractors and lumber suppliers, and permit rules vary by county and mobile home park.
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