How Much Does It Cost to Build a Rooftop Deck?

Typical Range:

$7,500 - $15,000

Find out how much your project will cost.

Cost data is based on research by HomeAdvisor.

Updated May 3, 2022

Reviewed by Ezra Laniado, Expert Contributor.

Written by HomeAdvisor.

The average cost to build a 300-square-foot roof deck is $11,250, ranging from a low of $7,500 to a high of $15,000. This is $25 to $50 per square foot, depending on the material you choose, the location of your home, and how fancy you want your new deck to be.

Building a roof deck is a great addition to your home since it offers an open and flexible rooftop area that allows homeowners to enjoy the outdoors and unwind, all within the comfort of their homes. Read on to find out the details regarding a rooftop deck build.

Average Costs to Build a Rooftop Deck

Average Cost$11,250
High Cost$15,000
Low Cost$7,500

Building a Rooftop Deck Material Prices

The cost of materials to build a roof deck is $0.90 to $35 per square foot or $135 to $5,250 for a 150-square-foot deck. The final cost depends on the material you choose.

MaterialCost per Square Foot150-Square-Foot Deck
PVC decking$9 – $12$1,350 – $1,800
Tile tech pavers$16 – $25$2,400 – $3,750
Pressure-treated wood$2 – $5$300 – $750
Porcelain decking$3 – $35$450 – $5,250
Faux grass$0.90 – $2$135 – $300
  • PVC decking: Easy to repair and fits dry or wet conditions

  • Tile tech pavers: Durable and protective

  • Pressure-treated wood: Durable, resistant to extreme temperatures, and can last up to 30 years

  • Porcelain decking: Lightweight, durable, and low-maintenance option

  • Faux grass: No upkeep required

Building a Rooftop Deck Installation Costs

The average labor costs to build a roof deck will range from $15 to $35 per square foot. The average size of a roof deck is 150 to 300 square feet, which will cost anywhere between $2,250 to $10,500.

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Building a Rooftop Deck Installation Costs by Square Footage

A roof deck will cost $25 to $50 per square foot, depending on the material, deck size, and design.

Building a Rooftop Deck Cost Factors

Many elements will factor into the final cost when building a roof deck.


Allow 5% to 15% of the total cost for design and structural engineer costs to assess your roof's structural integrity. Before starting this project, it's important to have a layout that'll allow you to utilize the roof deck and control traffic flow fully. “The design should also take into consideration any exposed pipes or conduits on the roof in order to conceal them with the proper choice of decking material,” says Ezra Laniado, Expert Home Building and Remodeling Contributor.

Roof Condition

The roof condition impacts the price and whether any repairs need to be done before the work begins, such as removing old finishes or fixing a roof that doesn't drain. In the latter case, you'd want to factor in roof repair costs. In some situations, you'll also need to have your roof inspected by a general contractor near you before deciding to build this addition.


Building a rooftop deck requires a permit from your municipality, so you need to add a permit fee to your budget.

Roof Access

You’ll have to consider how you and your family will safely access the new roof deck. Does your house offer a walk-out, or will you need a pilothouse, which is an enclosed stairway that acts as an entrance to the rooftop?


You have to insulate your rooftop and seal every corner to avoid water and temperature leaking through your roof. The cost to seal a deck will depend on where you live and your city’s local codes.

Additional Elements

You can upgrade your roof deck by adding elements such as an outdoor kitchen, built-in seating, landscaping, pergola, or a firepit. All these elements will add to the final cost of the rooftop deck.

DIY vs. Hire a Rooftop Deck Contractor

Building a rooftop deck isn't a DIY project. It requires zoning, building code, and construction knowledge and experience and has many risks only professionals can avoid. Making mistakes while building a rooftop deck will lead to costly repairs in the future. Contact a local deck builder to help build your dream rooftop deck.


Where can I build a rooftop deck?

A rooftop deck is usually built on a flat roof above the highest floor of your home. To get the most out of your property, it can occupy a half-floor if you have walk-out access, or you can also utilize any flat rooftop that doesn't have access.

When can I consider installing a rooftop deck?

You’re a good candidate for a rooftop deck if you fit in one of these categories:

  • You have a flat rooftop.

  • You want outdoor space, but your yard is too small.

  • You need to renovate your space, but you have a limited budget.

  • You want to expand the curb appeal and resale value of your home without significantly changing the exterior.

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