How Much Does It Cost to Build a Deck in Portland, ME?

A deck in Portland starts at about $10,000 for a full pressure-treated build and about $15,000 once you move to composite decking with composite railing. Larger and more complicated builds run to $75,000 and beyond.

These figures qualify a budget, they do not price a job. They reflect averages over hundreds of projects, and yours may come in below or above.

I match homeowners with vetted deck builders in Portland, and I cover deck building across Maine. Three quotes, free, no obligation to hire any of them.

Which two numbers should you memorise?

Most deck pages give you a per-square-foot figure and stop. The more useful numbers are the project floors, because they are what tell you whether this project is happening at all.

The only real exception to the first is a bare entry landing, which is a smaller thing than a deck.

Per square foot, for reference:

A note on that second row, because it corrects something I used to say myself. One hundred dollars a square foot is the middle of the range for composite work, not the floor. Anybody quoting composite meaningfully below it is leaving something out.

Why do small decks cost more per square foot?

This is the single most useful thing on this page and it is the opposite of what everybody assumes.

Footings are close to a fixed cost. On a small deck they eat a large share of the total, so the per-square-foot figure climbs as the deck shrinks.

A real job from the deck builder in my network: a 10 by 10 pressure-treated deck with stairs and six footings came in at $9,800. That is roughly $100 to $120 a square foot for the cheapest possible material, purely because the footings and the stairs do not care how small the deck is.

The same crew could have built a 12 by 16 for roughly $1,000 more.

Read that twice. Nearly double the deck for about a tenth more money. If you are hovering between a small deck and a slightly larger one, the larger one is almost always the better buy, and going small is the expensive choice per foot.

What do the size bands look like?

What actually drives the number?

In the order the builder in my network puts them:

A ramp, if you need one. It is the largest single addition on this list and it is rarely in an early budget.

Stairs, and how many flights. Stairs are expensive per foot of deck they serve, and a second flight is not half the cost of the first, it is close to the whole thing again.

Whether usable footings already exist. Replacing a deck on sound existing footings removes one of the largest line items in the job. Worth having assessed before you assume a teardown.

Layout complexity. Shapes, angles, tie-ins to the house, and anything that is not a rectangle. Every corner is cuts, waste and time.

Height off the ground, which matters far less than people expect.

How much does height change the price?

A raised deck does cost more, and only really past a couple of feet off the ground. The reason is specific: staging and ladders add roughly one crew day.

That day is the same whether your job is a two or three day small build or a ten to fifteen day large one. So height is a large percentage on a small deck and a small percentage on a big one.

Never accept height presented as a fixed multiplier. A second-floor deck is not automatically double.

Which materials are worth paying for?

Pressure-treated is the floor and it is a perfectly legitimate deck. It needs maintenance and it will look its age.

Capped composite and PVC are the step up. They cost more at the start and they are what most people actually want when they picture the finished thing. PVC generally wants closer joist spacing than pressure-treated decking does, so it changes the framing underneath rather than only the surface. Your builder should raise that before quoting, and the decking manufacturer sets the requirement.

Railing is a real budget line rather than a detail. Composite railing is what pushes a composite deck to the $15,000 floor. Aluminium railing is worth asking about where you want the view rather than the rail.

Joist tape over the framing is inexpensive, invisible and it is the difference between framing that lasts and framing that rots at every fastener. Ask whether it is in the quote, because it is a common quiet omission.

Helical piles are worth asking about on difficult ground. They go in fast, they reach proper bearing without a large excavation, and on a tight Portland lot that access advantage is worth real money.

What does Portland change?

On the peninsula, access is the constraint. Narrow lots with almost no setback, nowhere to stage lumber and nowhere to park. Everything is carried through or around the house. That is a genuine line on a quote here and it should be.

Privacy and overlooking matter more than size on peninsula lots, where a deck frequently looks straight into a neighbour's window. That drives screening and layout decisions rather than square footage.

Off the peninsula there is room to work, and decks in Deering and North Deering price as ordinary suburban decks.

Historic district review covers exterior work visible from a public way, and a deck can qualify. Roughly a dozen local districts exist in the city, and the answer for your address comes from the city.

Who pulls the permits?

A deck almost always needs a permit, and most Maine towns are straightforward about it. A same-footprint replacement is frequently a form and a fee.

Two things worth knowing. Some Maine towns set the permit fee as a percentage of total project value, which becomes a real line on a large deck rather than a nominal charge. And the builder in my network includes permit cost in his estimate, which not every contractor does, so check whether yours has.

Ask Portland Permitting and Inspections what your project needs and what the fee basis is.

A statewide fact for your comparisons: Maine does not license general contractors or builders. Only plumbers and electricians hold state licenses, so no deck builder here holds a credential you can look up. Insurance, references, financial stability and finished work are checkable, and my ten-step process checks all four before I hand you a name.

Where should you save, and where not?

Save by building slightly bigger rather than smaller, which is the counterintuitive lever explained above.

Save on the decking material before you save on anything structural. You can live with pressure-treated and replace the surface in fifteen years.

Save by keeping the shape simple. A rectangle is dramatically cheaper than the same area with angles in it.

Save by reusing sound footings where an assessment says they are sound.

Do not save on the footings themselves. They are the part that cannot be fixed later without taking the deck apart.

Do not save on joist tape or flashing at the house. Both are cheap and both are where decks fail.

Do not save on the railing if the deck is raised. That is a safety element rather than a finish.

What does a worked example look like?

A 12 by 16 pressure-treated deck at ground level in North Deering. New footings, one short flight of stairs, simple rectangle, driveway access.

192 square feet at the pressure-treated rate puts it a little above the $10,000 floor, and the size works in your favour compared with the 10 by 10 described earlier.

Take the same deck to a West End lot, raise it to the second floor, make it an L-shape around a corner of the house, add composite decking and composite railing and a second flight of stairs. You have crossed the composite floor, added a crew day for staging, added corners, and doubled the stairs.

Same square footage. A different order of number.

Frequently asked questions

What is the cheapest deck I can build? About $10,000 for a full pressure-treated build with new footings. Below that you are looking at an entry landing rather than a deck.

Why is composite so much more? The decking costs more, the railing usually costs more, and PVC generally needs closer joist spacing, so the framing underneath changes too. The practical floor lands around $15,000.

Is a small deck cheaper? Cheaper in total, more expensive per square foot. Footings and stairs are close to fixed, so going slightly larger is usually the better value.

Does a second-floor deck cost double? No. Staging and ladders add roughly one crew day, which is a large percentage on a small job and a small one on a large job.

Can I reuse my existing footings? Sometimes, and it is worth having them assessed rather than assumed. It removes one of the biggest line items in the build.

Do I need a permit for a deck in Portland? Almost certainly. Ask the city, and ask how the fee is calculated, because some Maine towns base it on project value.

How do you get a real number for your deck?

Nobody can price a deck without seeing the ground, the house it attaches to and the way in.

Tell me roughly the size you want, whether it is at grade or raised, and whether there is an existing deck coming off. Those three answers decide which builders should be quoting.

More on the work itself: deck builders in Portland, ME · all the Portland trades I cover

Before you sign: reading a builder's written estimate · the warning signs worth walking away from