Basement Waterproofing Cost in Denver [2025 Data]

Basements in Denver are prone to moisture issues because of the area’s mixed clay and rocky soils, and seasonal heavy rains and snow. Basement waterproofing in Denver costs around $4,425 on average, with most homeowners spending between $2,096 and $7,045 based on factors like the basement’s size and whether the work is interior or exterior. Considering these and other factors can help you choose the most effective and cost-efficient waterproofing system for your home.

Basement Waterproofing Cost Factors 

The cost of basement waterproofing in Denver, CO depends on factors like the method you use and the size of your basement. Soil composition, moisture levels, and Denver’s hilly terrain can also influence costs, especially for projects that require deep excavation or multiple drainage solutions.

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.

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.

Basement Waterproofing Pro Costs

Hiring a pro for basement waterproofing in Denver comes with costs not everyone considers. For instance, in addition to material and labor fees, you may also need to pay for things like permits and taxes, which can make a significant dent in your overall costs. 

Labor

In Denver, waterproofing labor rates generally fall between $95 and $165 per hour, though prices fluctuate depending on the project’s scope and conditions. Work that involves digging through compacted clay or operating in tight city lots often takes longer and requires heavier equipment. Labor costs can also edge higher during the winter months when frozen ground and weather delays make excavation and drainage work more demanding.

Permits

In Denver, any basement waterproofing work that involves altering a foundation, adding drainage, or excavating around the home typically requires approval from the Community Planning & Development Department. Instead of a set price, permit costs scale with the project’s construction value. Small residential jobs may fall at the lower end of the fee schedule, costing around $100 to $200, while complex waterproofing projects involving major excavation or grading can cost substantially more once plan review and inspection fees are factored in.

Licensing and Insurance

In Denver, contractors doing basement waterproofing typically need to be licensed under Colorado’s General Contractor or Specialty Contractor regulations, depending on the municipality’s requirements. They’re also expected to carry liability insurance and workers’ compensation, both of which raise their operating costs. These overhead expenses often get baked into their estimates for larger waterproofing jobs.

Taxes

Basement waterproofing projects in Denver are subject to Colorado’s 2.9% state sales tax, along with additional city and county taxes that usually bring the total rate to about 8%. But sales tax applies only to materials, so you should confirm that material costs are itemized separately in your estimate to avoid being taxed on the full project total.

Does Basement Waterproofing Increase Home Value?

Basement waterproofing in Denver doesn’t usually produce a direct financial return, but it’s a valuable investment when it comes to protecting your home’s structure and resale value. The city’s variable climate, from spring snowmelt to heavy summer storms, can stress foundations and cause leaks over time. A properly sealed and drained basement helps prevent water damage, mold, and foundation cracks, which are issues that can quickly become expensive and make your home less attractive when it’s time to sell.

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 survey 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. 

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