Plumbing and heating contractors are solo plumbers, small shops, and hydronic or HVAC-adjacent tradespeople who repair and install water supply, drain, gas piping, water heaters, boilers, and heating systems. Invoices usually cover a service call or diagnostic fee, labor, parts and materials, permits, and sometimes equipment such as a boiler or water heater. Customers include homeowners, landlords, property managers, and general contractors.
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Service and repair work is usually billed either hourly with a minimum service call fee, or by flat-rate pricing from a book of set prices per task (for example, replace a toilet fill valve or flush a boiler). Many shops charge a trip or diagnostic fee that covers the first half hour to hour and then bill labor in increments after that. Materials are billed at cost plus a markup, commonly 20 to 50 percent depending on the part and whether you carry it in stock. Installations such as water heaters, boilers, radiant floor systems, and repipes are normally quoted as a flat price that includes equipment, labor, permit, and disposal of the old unit. New construction and remodel rough-in work is often priced per fixture or per bathroom, or billed in progress draws. After-hours, weekend, and emergency calls typically carry a premium of 1.5 to 2 times the normal rate. Many contractors also offer annual maintenance agreements for boiler or furnace tune-ups at a fixed yearly price.
| Service | Priced | Typical range |
|---|---|---|
| Service call / diagnostic fee | per visit | $85-200 |
| Plumber labor (journeyman) | per hour | $90-175 |
| Emergency or after-hours labor | per hour | $150-300 |
| Water heater replacement (tank, 40-50 gal, installed) | flat fee | $1,300-3,000 |
| Boiler annual tune-up and combustion check | per visit | $150-350 |
| Drain cleaning (main line, cable or snake) | per visit | $175-450 |
| Toilet or faucet replacement (labor only) | per fixture | $150-400 |
| Boiler replacement (residential, installed) | flat fee | $6,000-14,000 |
Typical US ranges. Rates vary by region, experience, and job size.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Service call and diagnostic, no hot water | 1 visit | $125.00 | $125.00 |
| Remove and dispose of old 50-gal gas water heater | 1 each | $100.00 | $100.00 |
| New 50-gal gas water heater, 6-year warranty | 1 each | $925.00 | $925.00 |
| Install labor, including venting, gas connection, and expansion tank | 3.5 hours | $125.00 | $437.50 |
| Fittings, flex connectors, gas fittings, and dielectric unions | 1 lot | $88.00 | $88.00 |
| Plumbing permit and inspection fee | 1 each | $75.00 | $75.00 |
| Total | $1,750.50 | ||
Notes: Payment due on completion. We accept check, card, and ACH. Tank carries a manufacturer 6-year parts warranty; our labor is warranted for 1 year. A $35 fee applies to returned checks. Past-due balances accrue 1.5% per month.
Many states and municipalities require the plumbing license number on invoices and contracts, and customers and insurers often want it for records.
Landlords and property managers often manage multiple properties and need to know which address a charge belongs to.
Equipment such as water heaters and boilers carry warranties, so the model and serial number are needed for claims. Itemized parts also reduce disputes over markup.
Clear labor lines show what the customer paid for when the repair was quick but the diagnosis took time.
Water heater, boiler, gas line, and repipe jobs often need a permit. Listing it shows the work was done to code and helps when the home is sold.
Customers often call back about leaks or failed parts. Stating the warranty period in writing sets expectations for what is covered.
Hidden problems like corroded shutoffs or code upgrades are common once walls are open. Referencing the approval prevents disputes over price differences from the estimate.
Residential repair work is usually due at completion, with payment by card, check, or ACH. Larger installations typically require a deposit of 25 to 50 percent to order equipment, with the balance due on completion or after final inspection. Commercial and property management accounts commonly use net 15 or net 30 terms and may require a PO number. Many contractors state a late fee, often 1.5 percent per month, and a returned check fee on the invoice; check your state's rules on interest limits. Some jurisdictions require specific written notices or contract language for home improvement work, so confirm what applies where you work.
Driving to the job, parking, and diagnosing a problem takes time even when no repair is made. A posted minimum service call fee keeps small jobs from losing money and makes it clear before arrival.
Water heaters, boilers, and specialty fixtures are special-order items or tie up cash. A deposit covers the supplier cost and protects you if the customer cancels.
Putting the equipment model and serial on the invoice helps with warranty claims and shows the customer exactly what was installed. It also protects you if a manufacturer defect is disputed.
Apply a set markup structure so small parts, fittings, and consumables are not forgotten. Many plumbers lose money by absorbing solder, flux, PTFE tape, and fasteners instead of billing a shop supplies line.
Sending the invoice before you leave or the same afternoon gets payment faster. Waiting a week increases the chance the customer questions charges they no longer remember.
Both are common. Hourly billing is simple for small repairs and unclear scopes. Flat-rate pricing works well when you can predict the task, because customers see a fixed price up front and you are rewarded for working efficiently. Many shops use flat rate for common jobs and hourly for troubleshooting.
It depends on the state. Some states tax materials only, some tax labor on certain repairs, and others treat installation as a nontaxable contract. Check with your state revenue department or a local accountant before deciding how to show tax on invoices.
Use progress billing. A common pattern is a deposit up front, a draw after rough-in or inspection, and a final payment on completion. Tie each draw to a clear milestone so the customer knows what they are paying for.
Send a written reminder with the invoice, work order, and any signed approvals. If that fails, many states allow you to file a mechanic's lien on the property for unpaid work, but deadlines and notice rules vary, so check your state's requirements promptly.
Yes, as long as you disclose the premium before starting. Put the after-hours rate on the work authorization or tell the customer in writing so it is not a surprise on the invoice.
Send a Plumbing and Heating estimate for approval, then turn it into an invoice when the work is done.
Plumbing and Heating estimate template