How Much Does Basement Waterproofing Cost?


Basements are a valuable asset for many homeowners. They provide extra living space, storage, and can even be transformed into recreational areas or home offices. However, one common issue that plagues basements is water infiltration, which can lead to a host of problems such as mold growth, structural damage, and a damp, unpleasant environment.

To combat these issues, basement waterproofing is often necessary. It is important to choose quality waterproofing contractors to repair and prevent water leaks on your property. But how much does basement waterproofing actually cost? Let’s explore the factors involved in determining the cost and the various methods available.

Factors Affecting Basement Waterproofing Costs

  1. Size of the Basement – the size of the basement is a crucial factor in determining the cost of waterproofing. Larger basements require more materials and labor, leading to higher costs. It’s important to consider both the square footage and the depth of the basement when estimating the overall cost.
  2. Type of Waterproofing Method – there are several waterproofing methods available, each with its own cost implications. The most common methods include interior sealants, exterior excavation, interior drainage systems, and exterior waterproofing membranes. The choice of method depends on the severity of the water issue, the location of the water source, and the budget of the homeowner.
  3. Severity of the Water Issue – the extent of the water infiltration and the severity of the problem will impact the cost. Minor leaks or moisture issues may require less extensive waterproofing measures, while significant water damage may necessitate more comprehensive solutions, which can increase the overall cost.
  4. Existing Structural Damage – if water infiltration has already caused damage to the basement’s structure, such as cracks in the foundation or compromised walls, the cost of waterproofing may be higher. Repairing the existing damage before implementing waterproofing measures is crucial to ensure the long-term effectiveness of the waterproofing system.
  5. Professional Expertise – hiring a professional waterproofing contractor will add to the overall cost. However, it is highly recommended to seek professional assistance as they have the expertise and experience to identify the root cause of the problem and provide effective solutions. DIY methods may seem cost-effective initially but can lead to more expensive repairs if not done correctly.

One of the main factors affecting the cost – is the specific method of waterproofing or basement improvement that you select.

  • Interior Waterproofing – interior waterproofing involves addressing water issues from within the basement. The cost for this method typically ranges from $70-$350 per linear foot. Size of the basement, the extent of the water problem, and the chosen waterproofing system will directly impct the cost of basement waterproofing for your property. Interior waterproofing methods may include installing interior drainage systems, sump pumps, or applying sealants or coatings to the interior walls and floors.
  • Exterior Waterproofing – exterior waterproofing is a more comprehensive approach that involves addressing water issues from the outside of the foundation. The cost for this method can range from $100 to $300 per linear foot or more, depending on factors such as the size of the basement, the condition of the foundation, the depth of excavation required, and the installation of drainage systems and waterproofing membranes. Exterior waterproofing is often more expensive due to the labor-intensive nature of the work, but it’s considered to be a more permanent solution and doesn’t require as much maintenance as interior waterproofing systems.
  • Basement Walkouts – basement walkouts involve creating an entryway or access point to the basement from the exterior. This is a more complex and involved project that typically requires excavation, foundation work, and the installation of stairs or a door. The cost for basement walkouts can range from $10,000 to $30,000 or more, depending on factors such as the size of the walkout, the design requirements, the materials used, and any additional features desired, such as handrails or landscaping.
  • Basement Underpinning – basement underpinning is a method used to increase the height of a basement by strengthening the existing foundation. This is often done to create additional headroom and maximize the usable space in the basement. The cost for basement underpinning can vary significantly based on factors such as the size and complexity of the project, the type of foundation, and the structural requirements. Generally, the cost for basement underpinning can range from $15,000 to $35,000 or more.

Don’t confuse basements with crawlspaces. Crawlspaces are typically space in the basement with low height of ceiling. The are commonly seen usually in older buildings. If your home has a crawlspace, you may want to consider crawlspace encapsulation project – where cracks in the walls will be repaired and the crawlspace – sealed.


Basement waterproofing costs can vary widely depending on factors such as the size of the basement, the type of waterproofing method used, the severity of the water issue, the existing structural damage, and the level of professional expertise required. While it may be tempting to opt for the cheapest option, it’s crucial to consider the long-term effectiveness and durability of the waterproofing solution.

Investing in a professional contractor and using high-quality materials will ensure that your basement remains dry, protected, and free from water-related issues for years to come. Remember to assess your specific situation and consult with experts to determine the best waterproofing method that fits your budget and requirements.