Free Waterproofing Contractor Invoice Template

What is a Waterproofing Contractor invoice?

A waterproofing contractor invoice covers work installing systems to prevent water ingress in basements, foundations, roofs, wet rooms, and other water-affected areas. Waterproofing includes cavity drain membrane systems for basement conversions, cementitious tanking for below-ground walls, injection damp proofing, chemical damp-proof courses, flat roof waterproofing membranes, and wet room waterproofing systems. Because damp and water ingress can have severe long-term structural consequences, guarantee documentation is important. Many waterproofing products come with manufacturer-backed guarantees of 10-25 years when installed by certified applicators. Invoices should reference the system used, the manufacturer, and the guarantee terms to help clients understand the value of the work.

What to include on a Waterproofing Contractor invoice

• Property address and area treated
• Waterproofing system type and manufacturer
• Surface preparation work
• Material quantities and specification
• Drainage provisions (cavity drain, sump pump)
• Guarantee reference and term (years)
• Certified applicator reference (if manufacturer certification required)
• Labour and materials breakdown
• VAT details if VAT-registered
• Payment terms
• Contractor license number, bond, and liability insurance
• Warranty terms and whether the warranty is transferable to future owners
• System type installed (interior perimeter, exterior excavation, drain tile, injection)
• Permit / inspection fees and conditional lien waiver reference

Common waterproofing contractor invoice line items

Setting your waterproofing contractor rates

Priced by linear foot of foundation wall for perimeter systems and by the crack or unit for repairs, not hourly; interior systems run $50-100/ft while exterior excavation runs $100-290/ft because of digging and landscape restoration. Regional soil conditions, water-table depth, and access drive wide variance.

Payment terms

25-50% deposit before excavation, progress payments due within 7-15 days on residential, final on completion; Net 30 with 5-10% retainage held for commercial contracts

Billing pitfalls to avoid

• Warranty terms belong on the invoice: interior crack injection and drain tile are commonly warranted for the life of the homeowner (often transferable), and buyers expect the transferability spelled out at billing
• Interior vs exterior scope is a 3-5x price gap for the same wall length, so the invoice must state which system was installed or the total looks inexplicable to the customer
• Landscape and hardscape restoration after exterior excavation is a separate cost the homeowner often assumes is included; itemize it or absorb disputes
• Permit and inspection fees for foundation work should be a distinct line, not folded into labor
• Deposits of 25-50% before excavation are standard, and progress billing plus a conditional lien waiver sent with each draw protects lien rights on multi-week jobs

Tax notes

In separated contracts, buy materials tax-free on a resale certificate and charge the customer sales tax on the materials line only; lump-sum contracts have you pay tax on wholesale cost. Whether installation labor is taxable and whether the work counts as a capital improvement (often exempt) varies by state, so the labor/materials split on the invoice changes the tax owed.

This is general guidance, not tax advice. Tax rules vary by country, state, and situation, so confirm with a qualified accountant before relying on it.

How to invoice as a waterproofing contractor

Invoice in stages for larger basement conversions: preparation, membrane/tanking installation, drainage, plastering. For smaller jobs (DPC injection, wet room tanking), invoice on completion. Attach the manufacturer's guarantee certificate and your certified applicator documentation with the final invoice.