Basement Waterproofing Cost Breakdown Guide
The lines priced apart: excavation, drain and sump, membrane and sealant, and access lines, each inside its own frame, never summed.
Orange County, CA · Updated 2026 · Costs shown as ranges — your quote will vary by installer and scope
The lines, priced apart by frame
| Cost line | Frame A reading | Frame B reading |
|---|---|---|
| Excavation line | inside the complete exterior system at $10,000-$18,000; no separate figure | no line printed; project totals only |
| Drain and sump lines | interior drain tile at $40-$85 per linear foot | weeping tile at $60-$120 per linear foot; subfloor drain at $25-$55 per square foot; sump in system at $1,200-$2,500 |
| Membrane and sealant lines | inside the system totals; no separate figure | no membrane or sealant line in this frame |
| Access and restoration lines | no separate line; inside the system totals | no access line in this frame |
In Frame A most lines print inside the two system totals; in Frame B the drain and sump lines print as per-unit bands beside the project totals. The system whole prices on the basement waterproofing hub.
Excavation and system-total lines, as reported
| Cost line, as published | Reading | 2026 band |
|---|---|---|
| Complete exterior system | Frame A | $10,000-$18,000 |
| Complete interior system | Frame A | $6,000-$12,000 |
| Excavation, per-unit | both frames | no figure printed |
The excavation line sits inside the Frame A exterior total alone. Neither frame prints an excavation figure of its own, and no line here is added to a system total.
The drain and sump lines behind the totals, as reported
| Cost line, as published | Frame | 2026 reading |
|---|---|---|
| Interior drain tile | Frame A | $40-$85 per linear foot |
| Interior weeping tile | Frame B | $60-$120 per linear foot |
| Subfloor drain tile system | Frame B | $25-$55 per square foot |
| Sump pump inside a system | Frame B | $1,200-$2,500, component line |
| Average project, most projects | Frame B | $5,245; $2,460-$8,205 |
Frame A prints one drain reading; Frame B prints three component readings, apart. The sump reading stands as a component line inside a system frame, never a standalone purchase row.
The membrane, sealant, and access lines, as reported
| Cost line, as published | Frame | 2026 reading |
|---|---|---|
| Crack injection | Frame A | $250-$800 per crack |
| Epoxy injection | Frame B | $800-$1,500 per crack |
| Membrane line, separate | Frame A | no figure printed; inside the exterior total |
| Sealant line, separate | Frame B | no figure printed |
| Access or restoration line, separate | both frames | no figure printed |
The crack lines print as per-crack readings in both frames, while the membrane, sealant, and access lines count inside the totals. Named apart, never a line here: structural foundation repair, crawl-space encapsulation and vapor barriers, a standalone sump pump, a standalone yard French drain, and mold remediation, a held lane.
Reading a breakdown quote
- Line named beside every figure
- Each line read on its own frame
Frequently asked questions
What is the priced line in a basement waterproofing breakdown, as reported?
Frame B's priced lines are weeping tile at $60 to $120 per linear foot, a subfloor drain tile system at $25 to $55 per square foot, and a sump pump inside a system at $1,200 to $2,500. Frame A prices the drain line at $40 to $85 per linear foot and counts the rest inside its system totals.
What do the drain and sump lines print at, as reported?
Frame A prints interior drain tile at $40 to $85 per linear foot. Frame B prints weeping tile at $60 to $120 per linear foot, a subfloor drain tile system at $25 to $55 per square foot, and a sump pump inside a system at $1,200 to $2,500.
What does the excavation line print at, as reported?
Neither frame prints a separate excavation figure. In Frame A it sits inside the exterior system total at $10,000 to $18,000; in Frame B inside the project totals, an average at $5,245 and most projects at $2,460 to $8,205.
What do the membrane and sealant lines print at, as reported?
No separate membrane or sealant figure is printed in either frame. Those lines count inside the Frame A system totals, $6,000 to $12,000 interior and $10,000 to $18,000 exterior, and inside the Frame B project bands.
Can the breakdown lines be added into one total?
No. The line figures sit inside their own frames, the system totals sit as their own readings, and no combined total is printed here. No Frame B line is summed into a Frame A total.