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Basement Waterproofing Cost in Phoenix [2025 Data]
Normal Range: $1,913 - $14,166
Basement waterproofing in Phoenix, AZ, costs $7,165, on average, and most homeowners pay somewhere between $1,913 and $14,166 for a complete waterproofing system.
How we get this data
Iriana Shiyan / Adobe Stock Photography
Iriana Shiyan / Adobe Stock Photography
Cost Insights
Phoenix's monsoon season makes having a waterproof basement an important part of preserving a home's value.
With basements being rare in Phoenix, a lack of basement waterproofing pros drives up the general cost.
Additionally, homeowners should budget for paying sales tax that applies to both labor and materials for waterproofing projects.
For Phoenix homes without basements, popular basement waterproofing options like weeping tiles and membranes can also be used with slab foundations.
The average basement waterproofing cost in Phoenix is $7,165, with homeowners paying anywhere between $1,913 and $14,166 depending on the type of waterproofing solution chosen. Factors such as the size of your basement, the type of foundation under your home, and your preference for interior versus exterior waterproofing can all impact the cost. Overall, costs for basement waterproofing in Phoenix can be higher than the national average because the rarity of basements in this region means there aren't many local pros offering this service. Keep reading to learn more about what you can expect to pay to keep your basement dry for years to come in Phoenix, AZ.
Basement Waterproofing Cost Factors
When waterproofing contractors in Phoenix come to your property to provide quotes, they'll look at factors like your property's slope and potential areas for water intrusion to help you design a custom waterproofing system. If your property already has signs of basement water damage, contractors will trace the path of water into your basement to try to redirect moisture sources as part of your waterproofing strategy. Homeowners seeking to waterproof their slab foundations in Phoenix can consider options like weeping tiles and liquid membranes that are appropriate for both basements and slabs.
Basement Size
The cost to waterproof a basement falls between $3 and $10 per square foot on average, although where in this range your pricing falls depends largely on the type of waterproofing method you choose. In any case, large spaces require more time, labor, and material to waterproof than small spaces. Therefore, the larger your basement, the more you can expect to pay for waterproofing for any given method.
Below is a breakdown of how much you might spend for a range of basement sizes.
| Basement Size (Sq. Ft.) | Average Cost Range |
|---|---|
| 300 | $1,200–$3,000 |
| 500 | $2,000–$5,000 |
| 700 | $2,800–$7,000 |
| 900 | $3,600–$9,000 |
| 1,000 | $4,000–$10,000 |
| 1,200 | $4,800–$12,000 |
| 1,500 | $6,000–$15,000 |
| 1,700 | $6,800–$17,000 |
Interior vs. Exterior Waterproofing
Depending on where your basement water issues are stemming from and what solutions your expert recommends, you may need either interior or exterior waterproofing services. Some homes require both. Interior basement waterproofing is often more affordable because it doesn’t involve excavation and backfilling. Something like installing damp-proofing around the exterior of your foundation would require a lot of digging, which drastically increases labor costs.
You’ll spend an average of $3,000 on interior waterproofing services, while extensive exterior services will cost an average of $7,000.
Waterproofing Method
As mentioned above, professionals can waterproof your basement from the exterior or the interior. Exterior methods are more effective because they’re preventative, but they’re also more expensive because they tend to require excavation, which is time-consuming. The table below includes a list of basement waterproofing methods along with cost ranges for each.
| Waterproofing Method | Interior / Exterior | Average Cost Range |
|---|---|---|
| Weeping tiles | Interior | $60–$100 per square foot |
| Yard grading | Exterior | $200–$2,100 |
| Underground downspout | Exterior | $200–$1,500 |
| Gutter system | Exterior | $4–$40 per linear foot |
| Liquid membrane waterproofing | Exterior | $3–$7 per square foot |
Basement Waterproofing Pro Costs
Basement waterproofing pros in Phoenix, AZ, will create a custom quote for your basement that includes costs for materials and labor. Additionally, all local costs of doing business are generally bundled into hourly rates or flat project costs.
Permits
Depending on the type of waterproofing option you select, a permit may be needed to waterproof your basement in Phoenix. This is especially pertinent when your chosen waterproofing method involves any type of excavation around your home's foundation or any type of grading and drainage in your yard. For residential construction and remodeling permits in Phoenix, residents pay $150 on the first $1,000, with $9 added for each additional, $1,000 up to $10,000. The permit cost for projects valued above $10,000 is $231, with an additional $8 added for each additional $1,000.
Local Labor
With basement waterproofing professionals in Phoenix being hard to find, the hourly rate to hire a pro with basement experience is between $190 and $220.
Taxes
In Arizona, labor costs are subject to sales tax. That means that your contractor will be adding a 5.6% Arizona sales tax, 0.7% Maricopa County sales tax, and 2.8% Phoenix sales tax to both labor charges and the cost for all construction materials and parts needed to waterproof your basement.
Insurance
Arizona contractors are generally required to carry workers' compensation insurance and surety bonds that can impact the cost of doing business. On average, basement waterproofing contractors pay between $100 and $270 per month for coverage.
Licensing and Certification
While there isn't a city-specific license needed to work as a contractor in Phoenix, it is necessary for contractors to obtain licensing from the Arizona Registrar of Contractors (ROC) in order to work on most projects aside from simple repairs. That puts the burden of covering the $720 to $1,050 licensing fee for various specialties on the shoulders of a contractor. In addition to covering this initial cost, contractors must also pay renewal fees totaling $480 to $750.
Does Basement Waterproofing Increase Home Value?
As one of the few places in the United States to experience a monsoon season that runs from June through September each year, Phoenix has an unusual mix of dry and wet seasons that require special considerations from homeowners. With the monsoon season bringing heavy rainfall, basement waterproofing becomes crucial for preventing water damage and mold in homes in low-lying areas that are prone to flash flooding. For homes on graded properties where basements are more common, waterproofing a basement can help to prevent water damage in a home's basements or slab foundation caused by downhill deluges. Maintaining a dry basement significantly enhances the resale value of a home in Phoenix.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We’ve surveyed thousands of real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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