What is the cost per square foot for basement waterproofing?

Interior drainage and seal often $3–$6/sq ft; exterior membrane and drainage $8–$15/sq ft. Full systems with sump pump add cost.

Interior vs exterior waterproofing cost?

Interior is usually cheaper ($3–$6/sq ft). Exterior is more invasive but addresses water at the source ($8–$15/sq ft).

How long does basement waterproofing take?

Interior system 1–3 days; exterior 3–7 days. Full interior + exterior can take 1–2 weeks.

What is included in basement waterproofing?

Typically: interior drain tile and/or exterior membrane, drainage, sealants. Sump pump and battery backup may be extra.

Does homeowners insurance cover basement waterproofing?

Usually no for prevention. Water damage from sudden events may be covered; prevention is typically out of pocket.

How do I get the best waterproofing quote?

Get 2–3 quotes. Specify interior vs exterior and square footage. Ask what is included (sump, warranty).

What causes basement water problems?

Poor drainage, cracks, hydrostatic pressure, and high water table. Grading and gutters help; waterproofing addresses the rest.

How much does a sump pump installation cost?

Sump pump installation typically $500–$2,000 including pump and pit. Battery backup adds $200–$600.

Can I waterproof my basement myself?

Interior sealants and minor crack repair can be DIY. Drainage systems and exterior work usually need a pro.

What is the lifespan of basement waterproofing?

Interior drainage often 20+ years; exterior membrane 20–30+ years. Sump pumps last 5–15 years.

Do I need interior and exterior waterproofing?

Not always. Many homes do well with interior drainage. Exterior is recommended for serious water intrusion.

How much does it cost to waterproof a 1000 sq ft basement?

1,000 sq ft typically $3,000–$15,000+ depending on interior vs exterior and system type.

What is French drain cost?

Interior French drain (perimeter) typically $3–$6/sq ft. Exterior French drain $50–$100+ per linear foot.

How do I prevent basement moisture?

Fix grading, gutters, and downspouts. Seal cracks. Consider dehumidifier and interior or exterior drainage if needed.

Basement Waterproofing Cost Calculator

Use this free basement waterproofing cost calculator to estimate cost by scope (interior, exterior, both), square footage, severity, and location. Most projects run $2,000–$15,000+. Get a low, average, and high estimate below.

How much does basement waterproofing cost?

Basement waterproofing in the U.S. typically costs $2,000–$15,000+: interior $3–$6/sq ft, exterior $8–$15/sq ft. Get 2–3 local quotes.

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Average Basement Waterproofing Cost

National averages vary by scope. Final cost depends on sq ft and system type.

Cost by scope (per sq ft)

Typical ranges

Scope	Estimated cost
Interior	$3–$6/sq ft
Exterior	$8–$15/sq ft
Both / full system	$10–$20+/sq ft

Cost factors

What drives the total

Factor	Impact
Sump pump	$500–$2,000
Exterior excavation	Adds 30–50%

What Affects Basement Waterproofing Cost?

Scope — Interior is least; full interior + exterior is most.
Square footage — Larger basements cost more.
Severity — High water intrusion may require exterior work.
Location — Labor and materials vary by region.

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