How a waterproofing quote is built
Waterproofing quotes in Wilmington can range from a few gutter repairs to a full drain-and-pump system with a sealed crawlspace. That's not because companies price the same work differently. It's because they've diagnosed the problem differently. This guide explains the parts that make up a quote and the steps of a typical job. It doesn't list prices; costs depend on your house, and written quotes are the only reliable number.
Line items that move the price
- Gutters and downspouts. Cleaning, repairing and extending them is usually the smallest line, and sometimes the only one you need.
- Grading. Moving soil so the ground slopes away from the house costs more if there's a lot of it, or if a patio or driveway slopes the wrong way.
- Interior perimeter drain. Priced by the linear foot of wall. Breaking and replacing a basement floor edge adds labor.
- Sump pump. The pump, the basin, the discharge line and a battery backup are separate items. Ask for each.
- Exterior excavation and membrane. Digging down along the foundation is the most expensive approach, and costs rise with depth, access and landscaping to be replaced.
- Crawlspace encapsulation. Vapor barrier thickness, how far up the walls it goes, sealing vents, insulation and a dehumidifier each add to the price.
- Repairs. Rotted joists, sill plates or damaged insulation found during the work. Ask how surprises are priced before you sign.
- Permits and any engineer's letter.
The license threshold
The North Carolina Licensing Board for General Contractors says a general contractor must hold a state license by law when the total cost of a project is $40,000 or more. If your project could reach $40,000, the contractor needs that license. Look them up on the board's public license search, and don't split one job into smaller contracts to stay under the line.
The ground under New Hanover County
About 20 percent of the Cape Fear Public Utility Authority's raw water comes from wells in the Castle Hayne and Peedee aquifers beneath New Hanover County, and about 80 percent from the Cape Fear River at Kings Bluff. Groundwater is part of the local picture, but conditions vary from lot to lot. Ask each contractor what evidence they found on your property for the water they say they're stopping.
The process, step by step
1. Look before anyone visits
Walk around the house in a heavy rain. Note overflowing gutters, downspouts that dump at the foundation and puddles that form along the walls. Look in the crawlspace or basement afterward and write down when it gets wet.
2. Get several inspections
Ask each company for a written diagnosis: where the water comes from, how they know and how their proposal fixes it. Be wary of any company that proposes a full system without looking at gutters and grading.
3. Compare quotes
Line up scope, materials, pump and backup, discharge location, dehumidifier, repairs, permits and warranty. Check the license if the project may reach the threshold.
4. Sign and schedule
Read the payment schedule, the start date and how change orders work. Don't pay most of the price up front.
5. The work
Outside work usually comes first. Inside, the crew installs drains, pumps or the vapor barrier, and seals vents if the crawlspace is being encapsulated.
6. Testing
Ask the contractor to run the pump, show you where it discharges and show you how to test the backup. If there's a dehumidifier, ask what humidity it's set to hold.
7. The warranty
Get the warranty in writing. Ask what it covers, whether it requires annual service and whether it transfers to a buyer.
After the job
Check the pump and the crawlspace after every major storm for the first year, keep the gutters clean, and keep the inspection reports, contract and warranty together.