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Basement waterproofing cost calculator

Enter the wall length and the rates on your quote. See the all-in price per foot so bids line up.

A basement waterproofing cost calculator works from wall length, because most interior systems are priced by the foot of drain plus each sump.

Enter the feet of wall your quote treats and the rates it states, and the tool shows the total and the all-in cost per foot.

It has no built-in prices: every dollar figure comes from your own written quote.

Basement waterproofing cost calculator

Enter the wall length and the rates on your quote. See the all-in price per foot so bids line up.

Add up the walls the quote names.

From a written quote. No default: we hold no price data.

From a written quote. No default: we hold no price data.

Wall membrane, crack injection, permit. Optional.

— Total at your rates
— All-in per foot
— Breakdown
— Comparing bids

What this assumed —

Not a quote. Your figures only.

Why the per-foot figure is the one to compare

Totals hide scope. One bid may treat two walls, another all four. Dividing each total by the feet it treats gives a number you can compare, as long as the system is the same.

Know what the code calls waterproofing. The IRC separates dampproofing, which resists moisture, from waterproofing, which is required where a high water table or severe soil-water conditions exist. Foundation drains are a separate requirement under R405. A quote that uses the words loosely is worth questioning. See basement waterproofing.

Outside first. Gutters, downspout extensions and grade that falls away from the wall are often the cheapest work that changes anything. Rule them out with the water intrusion diagnostic before pricing a drain.

Questions this calculator answers

How is basement waterproofing priced?
Interior drain systems are usually quoted by the linear foot of wall plus a price per sump pump. Exterior work adds excavation. We publish no price figures because we hold no sourced data; enter the rates from your quote.
Why compare cost per foot instead of totals?
Because bids often treat different lengths of wall. Per-foot cost shows whether one firm is pricing more work or charging more for the same work.
Is interior or exterior waterproofing better?
They solve different problems. Interior drains manage water that gets in; exterior membranes and drains try to stop it at the wall. Which fits depends on where the water enters and the site.
Do I need waterproofing or just better drainage?
Often drainage. Water from roofs and poor grading is the most common source, and it is fixed above ground. Check that first.

Sources and methodology

Figures dated 26 October 2026. Last reviewed .

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