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How Much Does It Cost To Build A Roof Over A Deck?

The average home deck size is between 300 and 400 square feet (sq.ft.). An average cost for a roof over a deck is an estimated $55-$70 per sq. ft. (psf).

You can expect to pay between $16,500 and $28,000 to put a roof over your deck depending on the size. Asphalt shingle roofs cost $700-$1,400 and wood shake deck roofs cost $1,500-$3,000 or more. The most expensive material for a deck over your roof is clay tile which can cost up to $5,000 to build.


Area Square Footage of Roof Covering the Deck

Figuring the square footage of the area to be covered is relatively simple if it is a rectangular or square deck. However, the area you want to cover may be more involved with varying widths as the deck runs along the house.

You will have to do some measuring of each area of a different width. Often, with a long meandering deck, owners cover only the area used for dining, entertaining, and/or relaxing. 

Building Permits

An important consideration in cost is a building permit. Considered remodeling, the state, city, or county, or any combination thereof, will charge for a building permit.

The permit is generally based on building plans provided and length of the project. For example, in one city north of Los Angeles, the 2019 city building permit was almost $500. If you want lighting or a ceiling fan installed in the roof, an electrical permit will likely also be required.

If the project is done without a building permit, the owner can be fined, or worse, required to tear down the roof. Without a permit, any future insurance claims can be denied.

With a building permit, an official inspector provides peace of mind, approving the project.

Type of Roof Design and Cost of Materials

This factor has a wide range of variables. A deck can be covered with a pavilion, a more solid weather protection. Or it can be covered with a pergola allowing sun and rain while offering cover with a retractable canopy.

The most popular types of pavilion roofs are flat, gable, hip, and skillion (lean-to).

A flat roof is an easier construction project than the gable and hip roofs, saving also in construction materials. The roof is slightly pitched for water runoff.

However, water collection can still be a problem. The roof must be waterproof and is not really recommended for heavy rain or snow climates.

Trusses and Rafters 

A roof requires trusses or rafters in construction. Rafters are built on site and cost much more than pre-made trusses. If customization is required, rafters may have to be used.

Trusses are made of wood or steel. They are precision manufactured at the factory and come in various types. Steel trusses can cost twice as much as wood trusses. The fasteners are generally galvanized steel or the preferable stainless steel.

A specific truss is used based on the style of roof to be built. A smaller roof might use trusses costing $50-$75 each. However, a truss for a hip roof can cost $125-$150 each because of the additional material needed.

Using trusses makes the framing job fairly easy. However, there can be a waiting period of several weeks for custom-built trusses. When delivered, a crane is generally needed to lift the pre-built or custom-built trusses in place.


Plywood is the best choice for covering a pitched roof deck before adding, for example, shingles or tiles. Plywood is made up of layers of wood glued together. The evenly distributed strength of plywood comes from the grain alternating with each layer.

It also dries evenly as a result of these alternating layers, providing structural stability. The thickness of the plywood is determined by the roof’s rafter or truss spacing. Leaving the plywood to adjust to the local humidity before installation avoids swelling and buckling problems.

Roof Coverings

Most coverings will require some kind of underlayment, such as felt or synthetic sheet, attached to the plywood base first. Asphalt shingles, wood shingles or shakes, wood plank, wood paneling, metal, tiles, vinyl, solar shingles, thermosets, composites, the choices are many. And the prices cover a wide range of costs.

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