Waterproofing Contractor Invoice Template — Free Download (2026)
Waterproofing invoices carry more liability than almost any other home improvement contract. The warranty is long, the failure mode is invisible until it's catastrophic, and the homeowner typically can't verify the quality of what was installed after the walls are closed up. A well-documented waterproofing invoice — with a specific system description, linear footage, drain tile specs, sump pump model, warranty scope, and exclusions — protects both the contractor and the homeowner. This guide covers what to include on a basement waterproofing invoice for interior drain tile, exterior membrane, and combination systems, with examples and billing practices.
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System type and scope — interior vs. exterior vs. combination
The fundamental scope choice on a basement waterproofing job is interior drain tile, exterior waterproofing membrane, or a combination — and this choice belongs clearly on the invoice. Interior drain tile system: A perimeter trench is cut along the inside of the basement floor, a drain tile pipe is installed in gravel, and water that enters through the foundation wall is collected and directed to a sump pit before it can flood the floor. This system manages water after it enters the wall — it doesn't prevent entry. Exterior waterproofing: Excavation down to the footing outside the foundation, application of a waterproofing membrane to the exterior face of the wall, installation of drainage board, and footing drain to daylight or sump. Prevents water from entering the wall. More expensive and disruptive, but the gold standard for water exclusion. Combination: Both exterior membrane and interior drain tile — used when exterior alone may not be sufficient or when budget requires phasing. Note clearly which approach was used and why: 'Interior drain tile system only — exterior waterproofing not performed. Interior system manages water entry; does not prevent water from entering wall cavity. Exterior waterproofing is recommended for complete moisture exclusion; owner elected interior system at this time.'
Linear footage, wall coverage, and drain tile specification
Interior waterproofing is priced by linear footage of drain tile installed. Document the measurement and the product. 'Interior drain tile: 148 LF of perimeter trench, 8" wide × 8" deep (below footing level), French drain pipe — WaterGuard Basement Waterproofing System (Basement Systems Inc.), perforated rigid PVC drain channel with floor flange. Installed in clean washed gravel, 3/4" minimum. Drain tile connected to sump basin at SW corner of basement. All concrete removed patched with hydraulic cement after installation.' Include: Which walls were treated (all 4 walls, or specific walls where water was observed). Whether the drain tile goes under the footing or along the footing (under is more effective). The drain tile product and brand, not just 'french drain pipe.' Gravel backfill specification. How the trench is patched. If only partial perimeter was treated: 'Three walls treated (north, west, east) — south wall is block wall with no observed moisture entry; not included in this installation. If moisture appears on south wall in future, system can be extended at additional cost.'
Sump pump: manufacturer, model, HP, pit size, and backup system
The sump pump is the most critical mechanical component of an interior waterproofing system — and the most underspecified item on waterproofing invoices. 'Sump pump system: Basement Systems SuperSump Premier, 3/4 HP, installed in 18" diameter Glazen polyethylene sump basin with airtight lid. Discharge: 1.5" PVC to exterior daylight at east side of home, minimum 10 ft from foundation. Check valve installed on discharge line. Pump tested and confirmed operational at time of installation.' Also specify: Whether there is a backup pump (battery backup or water-powered). 'Battery backup: WaterWatch Battery Backup system, 12V deep-cycle marine battery, capacity approximately 8–12 hours of continuous pumping at normal water table levels. Battery included, full charge at installation. Battery replacement recommended every 3–5 years.' Backup pumps are a meaningful upsell and a genuine value-add — power failures during heavy rain events are exactly when the primary pump is working hardest. Note backup pump separately and explain why: 'Battery backup recommended because primary pump failure during a power outage (which often accompanies heavy rain) would result in flooding within hours without backup protection.'
Wall crack injection — epoxy vs. polyurethane, crack length
Crack injection is often performed alongside waterproofing and needs its own line items. 'Crack injection — poured concrete wall cracks: 3 cracks injected with 2-part polyurethane foam (low-viscosity, expanding). Crack lengths: 14", 22", 8". Polyurethane selected because: active moisture present in cracks at time of injection — polyurethane reacts with water and expands to fill crack; better for wet cracks than epoxy. Epoxy injection used for: 1 dry structural crack, 36" length, load-bearing wall — epoxy restores tensile strength across crack (polyurethane does not). Surface port spacing: 6" OC. Ports removed after cure, holes patched.' The epoxy vs. polyurethane distinction matters: polyurethane is flexible and better for wet/leaking cracks; epoxy is rigid and used when structural strength restoration is needed. Documenting which product was used in which crack and why shows technical knowledge and protects you if a homeowner later claims the wrong product was used.
Warranty scope, exclusions, and transferability
Waterproofing warranties are a major selling point and a major liability if not carefully scoped. Document the warranty in full: 'Warranty: Lifetime transferable warranty on interior drain tile system and sump pump installation (labor and system components). Warranty covers: water infiltration through basement floor and wall-floor joint where drain tile is installed. Warranty response time: 48 hours for active water entry. Warranty is transferable to subsequent property owners — see warranty card for transfer procedure. Warranty does not cover: (1) Surface water entry at window wells, window frames, or above-grade openings (these are waterproofing exclusions — separate from subsurface water). (2) Damage caused by sump pump failure due to power outage when no battery backup is installed. (3) Damage resulting from modifications to the drainage system by others. (4) Window well flooding. (5) Condensation (humidity) — separate from water infiltration.' Common exclusions that homeowners don't expect: window well flooding, which looks exactly like basement flooding but has a completely different cause and repair. If you don't exclude it, you'll get warranty calls for events your system wasn't designed to address.
Pre-installation assessment and moisture source identification
A waterproofing invoice should document the moisture source diagnosis before the system is described. This shows the homeowner you understood their specific problem, and it protects you if the system doesn't address a different moisture source that wasn't diagnosed. 'Pre-installation assessment (June 9, 2026): Active water entry observed at wall-floor joint on north wall (100 LF) and west wall (48 LF). Water entry pattern: hydrostatic pressure (water infiltrates under pressure during and after rain events — not condensation). Evidence: efflorescence on north and west walls, staining from repeated wetting, active seepage at floor joint after recent rain. No active cracks observed on north or west walls. South and east walls: no evidence of water entry at time of assessment. Window well on east wall: not sealed — recommend sealing or installing cover to prevent surface water entry (not in scope of this waterproofing contract — separate item).' This assessment gives the homeowner a record of what was found, shows why you recommended the scope you did, and creates a baseline for future reference.
Waterproofing invoice examples
Interior drain tile — full perimeter
INVOICE #WP-2026-0274
DrySpace Waterproofing | (614) 555-0133 | Customer: B. & R. Okafor | 1188 Willowbrook Ct., Grove City, OH 43123 | Service: June 10–12, 2026 | System: Interior drain tile, full perimeter
| Item | Amount |
|---|---|
| Pre-installation moisture assessment — active seepage identified at wall-floor joint, north and west walls. Efflorescence on north wall. Hydrostatic pressure pattern confirmed (not condensation). Source: elevated water table during rain events. Window well at east wall noted but not in waterproofing scope. | $0 (included) |
| Interior drain tile system — 168 LF perimeter trench, 8" wide × 10" deep (below footing level). WaterGuard drain channel, rigid perforated PVC with floor flange and wall standoff. Installed in 3/4" washed gravel. Connected to sump pit at SW corner. Concrete saw-cut, removed, and patched with hydraulic cement after installation. | $7,392 |
| Sump pit and pump — 18" diameter polyethylene sump basin, airtight lid with floor drain inlet. TripleSafe Sump Pump System: primary pump 1/3 HP, secondary 1/2 HP (activates if primary fails or water rises), battery backup pump with sealed deep-cycle battery (8–12 hr runtime). 1.5" PVC discharge, check valve, routed to exterior 12 ft from foundation (east side). | $2,840 |
| Crack injection — 2 poured concrete cracks, north wall. Crack 1: 18" — polyurethane (wet, active moisture). Crack 2: 12" — polyurethane (wet). Ports removed, patched after cure. | $480 |
| Window well recommendation (not in scope) — east window well has no cover and is not sealed. Recommend window well cover installation to prevent surface water entry. This is separate from hydrostatic water — the drain tile system will not address window well flooding. | $0 (note only — separate estimate available) |
| Deposit paid June 8, 2026 (33%) | −$3,571 |
| Balance due on completion | $7,141 |
5 invoicing rules for waterproofing contractors
Specify the drainage channel product by name — not just 'french drain'
Interior waterproofing systems vary enormously in quality. 'French drain' describes a concept (perforated pipe in gravel) — it doesn't tell the homeowner whether you installed a $0.40/ft corrugated flexible pipe or a $4/ft rigid engineered drainage channel with a wall flange that prevents wall sediment from clogging the pipe over time. When you specify the product by name — WaterGuard, Drain-Rite, BrightWall, or whichever system you use — you're giving the homeowner something they can research, compare, and verify. You're also differentiating yourself from the low-bid competitor who writes nothing. The homeowner who has two proposals, one that says 'install french drain system, $7,500' and one that says 'WaterGuard perimeter drain channel, 168 LF, installed below footing level with sump pit and TripleSafe pump system, $10,700 with lifetime transferable warranty,' has enough information to make an informed decision. Without specification, the comparison is purely price.
Always document whether water source is hydrostatic pressure or condensation — they have different solutions
The two most common basement moisture problems are hydrostatic water intrusion (water under pressure coming through the wall or floor joint) and condensation (humidity condensing on cool basement surfaces). They look similar — wet walls, moisture on floors — but they have completely different solutions. Drain tile and sump pumps address hydrostatic water. Dehumidification and vapor barriers address condensation. A homeowner who has condensation and buys a $10,000 waterproofing system will be unhappy when the system 'doesn't work' — because it wasn't the right solution. Document your diagnosis: 'Moisture source: hydrostatic water intrusion (confirmed by efflorescence, staining pattern, and timing of moisture events corresponding with rain). Condensation also likely present in summer months (humid air contacting cool basement surfaces) — recommend dehumidifier in addition to waterproofing system. Dehumidifier not in scope of this proposal.' This documentation shows competence, sets expectations, and protects you when the homeowner calls back in July asking why the walls still feel damp in humid weather.
List warranty exclusions explicitly — especially window wells and condensation
Waterproofing warranties are generous (lifetime is common) and generate good sales. They also generate warranty service calls for things the system was never designed to address. The most common: Window well flooding: a window well without a cover or drain fills with rainwater and floods the window — this looks exactly like basement water infiltration but has nothing to do with your drain tile system. Condensation: in humid summers, basement walls sweat. Homeowners call this 'my waterproofing isn't working.' It isn't — the waterproofing is fine; it's condensation. Above-grade water entry: crack in basement wall above grade, or improper grading that directs water toward the foundation. Putting exclusions in writing on the invoice prevents the frustrating conversation where you're trying to explain why a call isn't covered under warranty. It also protects your warranty's value — a warranty that covers everything is unsustainable; a warranty with clear scope is credible.
Photograph the pre-existing basement condition and reference photos on the invoice
Waterproofing disputes often arise months or years after installation when the homeowner notices new moisture and isn't sure whether it was pre-existing or new. Pre-installation photos are your best protection. 'Pre-installation photos taken June 9, 2026 — on file and available on request. Photos document: existing efflorescence on north wall, staining at wall-floor joint, two cracks in north wall (injected during this installation), window well condition (not sealed, no cover).' The photos serve a secondary purpose too: they show the homeowner what was found before you started, which helps them understand the scope of what you fixed. A basement that had significant moisture damage that you remediated is a better before-and-after story than a set of photos of a dry basement post-installation with no before context.
Use 33% deposit / balance at completion — avoid taking full payment before the job is done
Basement waterproofing is a 1–3 day job. A 33% deposit is appropriate — it covers materials (drain tile, sump system, concrete, gravel) and signals commitment. The balance is due when the system is installed, tested, and the homeowner has seen it working. Never take full payment in advance — the homeowner has no leverage for quality if they've paid in full, and you'll attract more suspicion than a deposit-based contractor. For very large jobs (full exterior + interior, $20,000+), consider a 3-payment structure: deposit, at rough-in, at completion. Some larger waterproofing companies use financing programs — if you offer financing, document it clearly: 'Financing arranged through [company]: 60 months at 0% APR on approved credit. Monthly payment: $X. Total financed: $Y. Financing company may place a lien on the property — confirm with title company if selling property before loan payoff.'
Frequently asked questions
How much does basement waterproofing cost in 2026?↓
Basement waterproofing costs in 2026: Interior drain tile only (partial perimeter): $3,000–$8,000. Interior drain tile (full perimeter): $8,000–$18,000 depending on basement size and linear footage. Sump pump installation (without drain tile): $800–$2,500 depending on pump quality and backup system. Exterior waterproofing (excavation + membrane): $15,000–$50,000+ depending on foundation size and excavation depth. Crack injection (per crack): $250–$800 depending on length and product. Key cost variables: Linear footage of perimeter. Basement accessibility (unfinished vs. finished basement requiring demo). Depth of footing (deeper = more excavation and trench depth). Number of sump pit locations. Pump quality tier (budget vs. premium triple-pump system). Warranty tier.
What is the difference between interior and exterior waterproofing?↓
Interior waterproofing (drain tile + sump): Manages water after it enters the wall cavity. Does not stop water from penetrating the wall itself. Less disruptive and less expensive. Lifetime warranty typical. Best for: managing ongoing hydrostatic water intrusion cost-effectively. Exterior waterproofing (excavation + membrane): Applies a waterproofing membrane to the outside of the foundation wall. Stops water from entering the wall. More expensive and disruptive (requires excavating around the foundation). Best for: new construction, significant wall deterioration, complete moisture exclusion. Neither approach is wrong — the right choice depends on the severity of the moisture problem, the condition of the foundation, and the budget. Many professionals recommend exterior waterproofing for poured concrete walls with active seepage, and interior systems for block or brick foundations where exterior excavation may not be practical.
Does basement waterproofing increase home value?↓
Basement waterproofing has a high ROI on home sale — but the math depends on the specific situation. A wet basement that is disclosed to a buyer typically results in a price reduction of $10,000–$30,000 or more, or a stalled sale requiring the seller to fix the problem before closing. A waterproofed basement with a transferable lifetime warranty is a selling point that can add value or remove a buyer objection. The warranty transferability is key for resale value — a warranty that transfers to the new owner is worth much more to a buyer than a non-transferable warranty. Document the transferable warranty clearly on your invoice and provide a warranty card or certificate. Real estate agents regularly tell sellers: 'Get your basement waterproofed before listing — buyers who see a finished waterproofed basement pay more and are less likely to negotiate.' The invoice and warranty documentation are what the agent shows to the buyer's agent.
How long does basement waterproofing last?↓
Interior drain tile system life expectancy: The drain tile pipe itself is plastic and essentially permanent. The sump pump is the maintenance item: sump pump life expectancy 5–15 years depending on quality and use frequency. Premium pumps (3/4 HP or above) with cast iron components last longer than entry-level pumps. Sump pit and drainage board: indefinite if properly installed. Practical maintenance schedule: Test sump pump annually (pour water into pit, confirm pump activates). Replace pump every 7–10 years proactively (don't wait for failure — failure during a rain event is the worst time). Replace battery backup battery every 3–5 years. Check discharge line for blockage (ice in winter, debris in outdoor pipe) annually. Exterior waterproofing membrane: depends on product — rubberized asphalt membranes last 10–25 years; crystalline waterproofing can be effectively permanent.
Is waterproofing covered by homeowners insurance?↓
Basement water damage is one of the most complex homeowners insurance topics: Sudden, accidental water damage (burst pipe, appliance failure): usually covered by standard homeowners insurance. Flooding from outside (storm surge, overland flooding): covered only by separate flood insurance (NFIP or private). Seepage and gradual water intrusion (the most common basement moisture problem): almost universally excluded from standard homeowners insurance. This means the vast majority of waterproofing jobs are not covered by insurance — they're out-of-pocket expenses for the homeowner. This is worth understanding as a contractor because homeowners sometimes ask about insurance coverage. The answer: standard HO policies exclude gradual water damage and seepage. Flood insurance covers sudden flood events from external flooding — not subsurface groundwater seepage. The homeowner is paying for this out of pocket.
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