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The Daily Insight

How much does a deck extension cost

Author

David Perry

Updated on April 20, 2026

How much does a deck extension cost? Adding onto an existing deck runs $15 to $50 per square foot. It depends on your location, the type of materials, and how complex the design is.

How much does a 12x12 deck cost?

Deck SizeSquare FeetAverage Cost10x10100$1,500 – $3,50010×12120$1,800 – $4,20012×12144$2,160 – $5,04012×20240$3,600 – $8,400

How much does a 20x20 composite deck cost?

Composite Deck QualityCost Per Square Foot InstalledAverage Total CostEntry-Level Composite Deck$20$5,821National Average Cost$28$8,064Premium Composite Deck$38$10,826

How much would a 16x16 deck cost?

16×16-foot Raised Deck: You can buy the materials for a 16×16-foot (256 square foot) deck using composite decking materials for about $5,600-$9,800 and build it yourself. A contractor would charge closer to $7,800-$15,700 to construct a deck of this kind.

Does a deck add value to a home?

Here’s a good one: many homeowners recoup a significant amount of the money they invest in their deck because the deck adds to the resale value of their home. … In fact, a survey from Home Remodeling magazine found that composite decks return about 74% of their original cost and wood decks return about 87%, on average.

How much does a 12 by 16 deck cost?

DimensionsTotal Square FeetAverage Price Range12x12144$5,760 – $8,64012×16180$7,200 – $10,80010×20200$8,000 – $12,00012×20240$9,600 – $14,400

What is the cheapest way to build a deck?

Choose wood, but carefully: Untreated wood decks are generally the cheapest to install, but don’t forget long-term costs. Wood decks require yearly maintenance and deteriorate quickly if they don’t get it.

How do I estimate the cost of a deck?

Often, adding a deck is significantly less expensive to add outdoor living space with a deck than it is to add an addition to your home. Adding a deck can add significant value to your home as well. The average cost of building a deck is about $20 – $50 per square foot, and most spend $4,000 to $12,000 to build one.

What is a good size deck?

Size of Your Home Most builders suggest that your deck should be no larger than 20 percent of the house’s* square footage. This is so that the deck does not overwhelm a home visually. This, of course, is up to you. If you feel you need a larger deck that takes up more of your yard space, feel free!

How much is labor for building a deck?

Labor costs will total just about two-thirds of the total project cost. With contractors charging, on average, about $35 per square foot. For an average deck size between 200 and 500 square feet, you can expect to pay out between $7,000 and $17,000 just for installation and labor.

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Is composite decking worth the money?

There is no doubt that composite decking material is more expensive than wood. However, it is valued for its striking resemblance to natural wood and efficiency making it an excellent choice for decking. It is easier to clean and maintain which makes it last long enough to transfer the same value to the next homeowner.

Is it possible to extend a deck?

One of the great joys of decking is its flexibility. As your needs change, you might start thinking your initial deck is too small and feel that you want to extend it. This is simply a matter of adding on another sub-frame. … To extend your deck up a slope, you can start the new sub-frame on top of the last.

Can a deck be extended?

Most decks are not built with a future addition or extension in mind. … It may be necessary to install new posts and footings below the existing deck beam to support the additional loads. Most people that add onto their decks also replace the decking and railings on the existing deck at the same time.

Can you expand an existing deck?

However, the good news is that if the original deck is structurally sound, you could consider simply extending the existing deck. … You could consider widening or lengthening the deck on its current level. Many people like to add new levels to the deck, connected by stairs.

Does a deck raise your taxes?

How much will a deck affect taxes and resale value? According to IRS guidelines, building a deck is a capital improvement and may increase local property taxes. Taxes vary from city to city, so check with the local tax assessor before beginning construction or repair.

How much does a nice deck cost?

The average price range of building a new deck in the United States can be anywhere between $4,000 and $11,000. Including materials and labor, a standard deck will cost roughly $30-$60 per square foot. That means, for a standard 14 x 20 foot deck, you can expect to pay around $6,000.

Are decks a good investment?

A deck is an overall solid investment that increases the value of your home, even in a down housing market. You can expect to recoup at least 70-80% of your building expenses when you go to sell your home.

How much wood is needed for a 12x12 deck?

A 12 -by-12-foot deck will need 144 lineal feet of decking. The amount of individual boards will depend upon the size and type of decking your choose and the amount of space you plan to leave between decking boards.

How many years does decking last?

Hardwood decking has known to last over 40 years, although pressure treated softwood can last just as long if it’s treated well. Left untreated, softwood decking can last between 10 to 15 years, so over time hardwood can be a more economical material.

How much does it cost to build a 10 by 10 deck?

Using composite to build a 10′ x 10′ deck can cost between $1,983 and $4,293.

What are floating decks?

A floating deck, also called a free standing deck, is simply a deck that’s not attached to any structure, including (of course) your house. To understand how to build a floating deck, here are a few basics. As an independent structure, a floating deck has a few advantages over an attached deck.

How much does it cost to build a 12x12 screened in porch?

Average Cost to Build a Screened-In Porch The total costs $3 to $5 per square foot for materials, and $2 per square foot for labor. If you want to build a completely new porch with screen, you’ll pay $25 to $120 per square foot for the entire project.

How much does it cost to build a 12x12 floating deck?

A 12 x12 deck can range in cost from $2 200 to $13 000, but the average will be $6 000. Costing $40 a square foot but can be as little as $15 or as high as $85, depending on the deck’s features. A pressure treated deck is the most economical, with composite being the more expansive option.

How deep should a deck be?

If you want to share this moment with some special, your deck needs to be a minimum of 9′ (2.7m) wide and 4′ (1.2m) deep. Ideally, with the door from the house in the middle of the deck. For you can go from the house to your chair without disturbing each other.

How much does a 200 square foot deck cost?

The cost to build a deck is largely dependent on the size and complexity of the deck being built. Building a deck under 200 square feet can average between $3,000 and $14,000, depending on the complexity and design of the deck.

What type of wood is best for decking?

Overall, our experts at Patio Productions recommend Cedar or Redwood as the best wood choice for outdoor decks. If you’re looking for a cheaper option, pressure treated wood is your next best option.

How much does a 400 sq ft deck cost?

Surprisingly, this is a reasonably priced construction project, with average costs of building a deck ranging from $5,000-8,000 for a 250 to 400 sq. ft. deck. Most popular decking materials include Composites (Trex), pressure treated lumber, as well as natural wood, such as: cedar, bamboo, or pine.

What are the disadvantages of composite decking?

  • A pricey alternative to wood. Durability comes at a cost, as composite decking is more expensive than wood. …
  • Composites aren’t natural. …
  • Composite decks aren’t completely maintenance free. …
  • You’ll need to comparison shop.

Why is composite decking so expensive?

The first reason why composite decking is expensive is that they’re not an expenditure. They’re an investment. They require much less maintenance over time as compared to normal decks. Composite decking materials are designed to be resistant to mold, mildew, and rot.

Can dogs nails scratch Trex decking?

Composite decking mimics the look of natural wood, but without the upkeep. While it’s much more scratch resistant than wood, it’s not totally scratch proof. With enough gusto, your pooch could still leave permanent marks.

Can you enclose a deck?

Fully enclosing a deck requires the addition of a roof of some kind. Is your existing deck’s foundation designed to bear the additional load of an attached roof? If not, then you will need to bring the foundation up to local building code standards before you can proceed.