Basement Waterproofing Cost in Baltimore [2025 Data]

The average basement waterproofing cost in Baltimore is $4,754, with most homeowners paying between $2,587 and $7,026 for different waterproofing options. As a coastal city, Baltimore's lower elevation and increased flooding risks necessitate more intensive waterproofing options, which may require excavation or the installation of drains. However, local basement waterproofing costs are still slightly below the national average. Read more on what to expect for your basement waterproofing costs in Baltimore, Maryland.

Basement Waterproofing Cost Factors 

For homes closer to the water in Baltimore, a comprehensive approach that includes yard grading, drains, and membranes may be needed to protect basements against moisture risks and water intrusion. Your waterproofing contractor will inspect your basement to look for risk factors based on details like your property's slope and your basement's orientation in order to provide the best suggestion for how to waterproof your basement.

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

Basement waterproofing professionals in Baltimore, Maryland, must factor in costs for taxes and insurance when providing homeowners with quotes. The scope of the project also determines costs for things like labor, materials, and permits.

Permits

In general, basement waterproofing techniques that involve excavation or making significant alterations to a basement, foundation, or yard all require permits. Your contractor will apply for all permits needed for this project through the Baltimore City Department of Housing and Community Development. With permit fees tied to project scope, homeowners might pay between $75 and $225 on average for permits.

Local Labor

Baltimore basement waterproofing professionals generally charge between $150 and $210 hourly. However, rates vary based on the type of work being done. For example, costs for digging trenches and adding piping to improve drainage will represent the higher end of the cost scale. Meanwhile, adding membranes or applying a waterproof sealant can represent the lower end.

Taxes

While labor for basement waterproofing in Baltimore isn't taxable, contractors will pass down the taxes incurred for the costs of materials to clients. Baltimore, Maryland, has a flat sales tax rate of 6%.

Insurance

Baltimore contractors are required to carry liability and workers' compensation insurance. Depending on the size of the business and number of employees, most contractors pay between $89 and $229 in monthly premiums in total.

Licensing Certification

Contractors handling the scope of work required for basement waterproofing need to be licensed through the Maryland Home Improvement Commission (MHIC). The cost for this is baked into the cost of doing business that ultimately determines contractor fees. The initial investment to operate as a contractor in Baltimore includes a $281.25 application fee, $100 guaranty fund assessment, and $22.50 processing fee.

Does Basement Waterproofing Increase Home Value?

Is basement waterproofing worth it in Baltimore? As with any coastal city, Baltimore is at elevated risk for water intrusion, moisture damage, and flooding during storms. This is why the return on investment (ROI) for waterproofing a basement in Baltimore can be as high as 90%. With local homebuyers in Baltimore often prioritizing basement inspections, having a basement that has undergone waterproofing can be a big selling point.  

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 extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on 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.