In Rockaway, rock is the biggest price swing. Trenching an interior drain or digging along a foundation in the township can hit shallow gneiss or large boulders, which slows the crew and can call for heavier equipment. Long discharge lines that have to travel around a septic field or well add cost too. In the borough, tight lots, shared driveways and finished basements in older homes drive the price more than the soil does. A small fix like gutters and grading can still be the cheapest answer in either town.
| Job | Typical range | What moves the price |
|---|---|---|
| Interior perimeter drain system | $40 to $120 per linear foot | Length of wall, floor thickness, finished space that must be removed, and number of sump pits |
| Sump pump installation or replacement | $600 to $2,500 | New pit versus existing pit, pump quality, discharge routing, and electrical work |
| Battery backup sump pump | $500 to $2,000 | Battery capacity, pump type, and whether a new pit or plumbing is needed |
| Foundation crack injection | $250 to $1,500 per crack | Crack length, wall thickness, epoxy or polyurethane, and access |
| Exterior excavation and waterproofing | $7,000 to $25,000 or more | Depth to footing, number of walls, rock in the soil, hardscape removal, and landscape restoration |
| Crawl space encapsulation | $5,000 to $15,000 | Square footage, liner thickness, cleanup and mold removal, and dehumidifier choice |
| Basement dehumidifier (installed) | $1,000 to $2,800 | Capacity, ducting, and whether a condensate drain or pump is needed |
| Waterproof wall coating or sealer | $1 to $8 per square foot | Product type and wall prep; best for minor dampness, not active leaks |
These are typical ranges from published cost guides, and your actual price will depend on the inspection and the specific job.