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Basement waterproofing is the process of preventing water from entering a basement or the lower level of a building, typically to protect it from potential water damage, mold growth, and structural issues. Various techniques, such as sealing cracks, applying waterproof coatings, installing drainage systems, and improving landscaping, can be used to keep the basement dry and free from water-related problems. Two primary methods of basement waterproofing are interior and exterior solutions. Each method comes with its own set of advantages, disadvantages.. In this blog, we will delve into the details of interior and exterior basement waterproofing, comparing the cost of basement waterproofing and factors to consider when making your decisions.

1st Method:
Interior Basement Waterproofing: It involves addressing water issues from within the basement. This method typically involves installing drainage systems, sump pumps, and other solutions to manage and redirect water that enters the basement.


•Basement drainage system cost is lesser compared to exterior methods.
•Quick installation with minimal disruption to living spaces.
•Suitable for minor leaks and dampness issues.
•Easier access for maintenance and repairs.
•Can be effective for certain situations where water intrusion is not severe.


•Doesn’t address the root cause of water infiltration.
•May not prevent moisture buildup and mold growth.
•Ongoing maintenance and potential repair costs.
•Limited protection against severe water penetration or structural issues.
2nd Method:

Exterior Basement Waterproofing: It involves preventing water from entering the basement by addressing issues outside the building. This method often requires excavation around the foundation to apply waterproof membranes, drainage systems, and other protective measures.


•Provides comprehensive protection by addressing water issues at the source.
•Long-lasting solution when properly done.
•Preserves foundation integrity.
•Minimizes the potential for mould growth and moisture-related problems.
•Exterior landscaping and living spaces remain untouched.


•Higher basement drainage system cost due to excavation and labor involved.
•Time-consuming process.
•Disruption to landscaping and outdoor areas during excavation.
•Accessibility challenges for future repairs or maintenance.

Below are 4 points for each as an analysis of the cost of waterproofing basement from inside and exterior basement waterproofing

Read more about basement waterproofing here

Interior Basement Waterproofing | cost of waterproofing basement from inside:

Installation cost of basement waterproofing: Cost of waterproofing basement from inside is usually less upfront because they don’t need vast excavation. cost of basement waterproofing can differ based on factors such as the type of basement drainage system cost and of sump pump.

Labor Costs: Since interior waterproofing involves less labour-intensive work, labor costs and cost of waterproofing basement from inside cost can be lower compared to the exterior methods.
Maintenance: While the maintenance cost of basement waterproofing is generally lower, ongoing maintenance for sump pumps and drainage systems should be considered if you don’t want higher basement drainage system cost.

Exterior Basement Waterproofing:

Installation Costs: Exterior waterproofing methods are typically more expensive due to the need for large-scale excavation around the foundation. The basement drainage system cost increases with the depth and size of the excavation required.

Labor Costs: Exterior methods involve more labour-intensive work, including excavation, employing waterproof membranes, and installing drainage systems in a reasonable basement drainage system cost. This leads to higher labor costs.

Materials: The materials used for exterior waterproofing, such as waterproof membranes, drainage pipes, and backfill materials, can be more expensive than interior ones.

Read more about damp proofing here.

Long-Term Costs: While exterior waterproofing has a higher initial cost, it often provides more comprehensive and long-lasting protection, likely reducing the need for future repairs or re-waterproofing.

Comparison Of Cost of Basement Waterproofing

Cost Of Waterproofing Basement From Inside And Interior Basement Waterproofing:
Interior waterproofing involves managing water that has already penetrated the foundation walls. It typically includes installing drainage systems and waterproofing coatings on the interior walls.

Read this blog to know the questions you must ask your contractor

Factors for cost of waterproofing basement from inside:

Drainage System: For installation of interior drainage systems like French drains or sump pumps, the basement drainage system cost can be around $2,000 and $6,000, depending on the complexity of the system and the size of the basement.

Waterproofing Coatings: Applying waterproof coatings to interior walls costs around $3 to $8 per square foot. This cost of waterproofing basement from inside can vary based on the type and quality of the coating.


  • The cost of waterproofing basement from inside is generally less expensive upfront compared to exterior waterproofing.
  • Minimal disruption to the exterior landscape.
    Can be done year-round, regardless of weather conditions.


  • Addresses water after it has already entered the basement.
  • May not prevent structural damages caused by water pressure on foundation walls.
    Doesn’t address the source of the water intrusion.

Exterior Basement Waterproofing:

Exterior waterproofing involves preventing water from reaching the foundation walls by applying coatings or membranes to the exterior surface and installing drainage systems.

Basement drainage system cost factors:

Excavation: Excavating around the foundation to access the exterior walls can cost between $8,000 and $15,000, depending on the depth and accessibility.

Waterproofing Membranes: Applying exterior waterproofing membranes can cost between $50 and $100 per linear foot.

Drainage System: Basement drainage system cost, such as French drains, can add an additional $2,000 to $4,000.


  • Addresses the source of water intrusion, preventing it from reaching the foundation walls.
  • Provides a comprehensive solution that helps in preventing structural damage.
    Increases the property’s value by enhancing its waterproofing capabilities.


  • Higher upfront costs due to excavation and labour-intensive work.
  • Weather-dependent, as exterior work, is best performed during dry seasons.
  • It can disrupt landscaping and outdoor areas.

When considering basement waterproofing, it’s essential to weigh the cost of basement waterproofing against the benefits. Interior waterproofing offers a more cost-effective solution for managing water that has already entered the basement due to lower installation and reasonable cost of waterproofing basement from inside. However, exterior waterproofing provides more comprehensive protection and can result in fewer long-term maintenance expenses by addressing the root cause of water intrusion, though at a higher initial basement drainage system cost. Ultimately, the choice between the two methods should consider factors like the severity of the water issue, budget constraints, and long-term goals for the property’s protection. Consulting with waterproofing professionals can provide a clearer understanding of the basement drainage system cost associated with each method in your specific situation. You can also prefer methods like interior sealants, interior basement drainage systems, foundation crack injections and products such as water sealing paints, waterproofing membranes, damp block waterproof coating etc, for temporary suppression.