How Much Does Roof Underlayment Replacement Cost in Phoenix, AZ? [2026 Data]

Roof underlayment replacement costs in Phoenix, AZ, average around $3,409, but range from $1,756 to $4,339. The main factors that impact the price are the roof’s size and the type of materials. 

Homeowners in Phoenix, AZ should opt for higher-quality, UV-resistant roof underlayment that can withstand the region's intense heat.Let’s explore the factors that determine the cost of roof underlayment replacement in Phoenix, AZ.

Roof Underlayment Replacement Cost Factors 

In addition to materials, the roof’s size, pitch, and type will determine the cost of replacing roof underlayment in Phoenix, AZ. Consult a local roofing pro to determine which material is best for your budget and home. 

Roof Size

The size of your roof will be the most significant factor when determining the total cost of roof underlayment replacement, as many roofers will charge by the square foot. Larger roofs require more underlayment material and require more time and effort to carry out the installation. Replacing roof underlayment costs an average of around $2 per square foot, with prices ranging from $1 to $3 per square foot in most cases.

Large roofs with steeper pitches will be more expensive to replace because they require more materials and labor. You can get a more accurate estimate if you calculate your roof’s square footage and then multiply by these average prices.

Type of Roof

The type of roof you have will determine what kind of underlayment is best for your home, which will impact the total roof underlayment replacement cost. Underlayment for an asphalt roof is normally roofing felt, which is very inexpensive and will cost closer to $1,756. Tile roof underlayment replacement costs closer to $4,339 because synthetic underlayments are better for tile roofs. Use the table below to get an idea of what your roof underlayment replacement will cost.

Roof Pitch

Your roof pitch will play a role in your total in a few ways. First, steeper roofs have larger surface areas that require additional materials and labor to get the job done, so a steep roof on a 1,000-square-foot home will cost you more in underlayment replacement costs than a shallow roof on a similarly sized property due to the difference in surface area.

Steep roofs are also more challenging and dangerous to work on, so roofers may bump up labor costs if they need additional safety equipment to get the job done.

Finally, roof pitch influences what roofing materials are suitable for your home, and the roofing material, in turn, affects the best type of roof underlayment. The indirect relationship between roof pitch and underlayment material can cause your price to increase or decrease based on the material cost of the underlayment you need.

Materials

There are three main types of roof underlayment, and each comes at a different price per square foot. Rubber underlayment is the most expensive but is the only true waterproof underlayment. You’ll often find it under metal roofing rather than under asphalt shingles or clay tiles. Roof felt is the most common and most affordable underlayment, and it’s considered the best roof underlayment for asphalt shingles.

Tile roofs are more common in Phoenix, which use a synthetic underlayment because they can endure extreme heat for many years. The cost to replace the underlayment on your Phoenix home will be more expensive if you use higher-quality materials, such as synthetic underlayment rather than felt.

Prep

In preparation for underlayment installation, your roofer will need to remove your old roof and old underlayment, and you’ll pay between $1,030 and $5,170 for the removal. Most roofers include this cost in their initial estimate, so you typically won’t have to budget separately for it.

They will install underlayment under your new roof material but over the roof decking or sheathing below. If you find damage to your roof decking when you remove your old roof, you might need to pay extra for roof decking repairs. New roof sheathing costs between $2 and $5 per square foot for materials and labor.

Roofing Pro Costs

Hiring a roofing pro in Phoenix, AZ, will ensure the job is done safely and prevent costly DIY mistakes. Replacing roof underlayment is dangerous due to fall risks, so it’s best to leave this project to the roofing pros. 

Labor can account for 50% to 60% of the total cost of roof underlayment replacement. The price will depend on their experience and the complexity of the job.Roofers typically charge by the square foot or by the hour.

Permits

In most municipalities, you’ll need a building permit before you can legally replace your roof. There’s no permit specifically for roof underlayment replacement, but you will need one to install new roofing over the underlayment. According to the City of Phoenix Planning & Development Department Guide, a building permit cost is $195 on the first $1,000, plus $12 for each additional $1,000, or fraction thereof, to and including $10,000.

Does Replacing Roof Underlayment Increase Home Value?

If the new underlayment includes replacing the roof, it can significantly increase your home’s value, with a 50% to 70% return on investment. Phoenix homeowners who opt for higher-quality materials, such as synthetic, will reap a higher ROI than those who choose cost-efficient alternatives, such as felt. Replacing or repairing the roof on your Phoenix home will make it more marketable to potential buyers because it boosts curb appeal and prevents them from having to make costly repairs.

How Angi Gets Its Local Cost Data 

To help homeowners plan their next project, Angi provides readers with carefully researched cost data and upholds strict editorial standards. We start with national average project costs, which we collect by analyzing competitor information, retailer material costs, and input from professional contractors. We then apply local price index data to calculate location-specific estimates that reflect what homeowners typically pay in their local area. To do that, we use data from the U.S. Bureau of Economic Analysis (BEA), including its Regional Price Parities (RPPs), which measure price differences across cities. This helps us account for differences in labor, materials, and overall cost of living, so estimates in higher- or lower-cost areas better reflect real-world local pricing.

Every estimate undergoes a thorough editorial review to verify accuracy, consistency, and alignment with observed market conditions.

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