Flat Rate vs Hourly Plumbing Pricing: How to Price Plumbing Jobs

TL;DR: Angi's 2026 guide says hourly billing is the standard in plumbing, but some plumbers charge flat rates for routine jobs like clearing a drain or fixing a running toilet. Angi lists typical flat rates of $100 to $400. Use flat rates for jobs you've done a hundred times. Use hourly (time and materials) for anything you can't see before you start.

• Hourly (time and materials). The customer pays for your time plus parts. You carry no risk if the job runs long. The customer does.
• Flat rate. One price for the job, agreed before you start. If it takes you 40 minutes or 90, the price is the same. You carry the risk. You also keep the upside when you're fast.

Customers like flat rates because they know the number before you pick up a wrench. Nobody watches the clock over your shoulder.

Flat rate works for:

• Toilet repairs and swaps.
• Faucet and fixture replacements.
• Drain clearing at an accessible cleanout.
• Garbage disposal swaps.
• Standard water heater replacements, same type and location.

Hourly works better for:

• Leaks you can't find yet.
• Remodels and rerouting.
• Old houses with mystery piping.
• Slab leaks and main line work.
• Anything where you'll be opening walls.

Hybrid: charge a service fee to diagnose, then give a flat price for the fix. The customer approves the price before you start. Some plumbers work this way.

Start small. Ten jobs are enough.

1. Pull last year's invoices. List the 10–20 jobs you do most.
2. Find the real time for each. Use your records, not your memory. Note the fastest, slowest, and typical times.
3. Price the typical time, not the fastest. Multiply it by your hourly rate. Need a rate? Start with our guide to pricing small business services.
4. Add drive time if your flat rate includes the trip.
5. Add parts with your markup. Use standard parts. Price upgrades separately.
6. Add a cushion for the bad ones. The seized shutoff. The corroded supply line. A flat rate has to cover the slow jobs too.
7. Round to a clean number.
8. Check it against the market. Compare with local competitors and published cost guides.
9. Review every 3 to 6 months. Parts prices change. So does your speed.

Round numbers, to show the math. Use your own.

The job: replace a fill valve and flapper on a standard toilet.

• Typical time on site: 45 minutes = 0.75 hours.
• Drive time included: 0.5 hours.
• Total time: 1.25 hours × $89 (a round rate for this example; use your own) = $111.25.
• Parts at cost: $25. With a 30% markup: $32.50.
• Subtotal: $143.75. Round to $145.

Sanity check: Angi's 2026 guide lists toilet repair at $100 to $300. A $145 flat rate sits inside that range.

Now look at the risk. If the shutoff valve snaps, is that part of the $145? Decide before it happens. Write it down. A good rule: "If we find another problem, we'll stop and give you a price before we do anything extra."

On a water heater call, give the customer choices. For example:

• Repair the current unit.
• Replace it with the same type.
• Upgrade, such as a different size or type.

Price each one in writing. The customer picks. You avoid the "you just want to sell me a new one" argument, because they chose.

Every flat-rate quote should say:

• What's included: the work, standard parts, haul-away, cleanup.
• What's not: drywall repair, upgraded fixtures, extra problems found during the job.
• What happens if you find something else: stop, explain, price, get approval.
• Payment terms: when it's due and how you take payment.

People search "how to invoice a plumbing job." Keep it simple:

1. Use the same job reference on the quote and the invoice.
2. List the flat-rate job by name, exactly as quoted.
3. Add approved extras as separate lines, each with the approval noted.
4. Show parts separately if the job was hourly.
5. Show the service fee and any credit applied.
6. State the due date and how to pay.

If the invoice matches the quote line for line, you'll get fewer "what's this charge?" calls.

The Plumber Price List & Service Menu ($4.99) gives you an editable price list as an HTML file and a Word file, so your flat rates and service fee are in one place.

The Plumber Pricing Calculator ($14.99) has a service pricing tab, a quote builder and a job log, where you can track real job times to set flat rates. For the paperwork side, Plumber Business Documents Premium ($19.99) includes a Service Log and an Invoice Checklist. For pricing ideas beyond plumbing, see How to Price Small Business Services.

Neither is always better. Flat rates suit routine, predictable jobs. Hourly suits work with unknowns. Many plumbers use both.

Look at the job, list the work and parts, use your own past job times for labor, add parts with markup, permit fees if needed, and a cushion for surprises. Then write down what's included.

Your choice. Some plumbers include the trip in the flat rate. Others charge a service fee plus the flat rate. Be clear on the phone and on the quote.

There's no single right number. Your markup should cover sourcing, pickup time, storage, returns, and warranty risk. Check your final prices against your local market.

Every 3 to 6 months is a sensible habit, and any time a major parts price changes.

Checked October 1, 2026.

• Angi, "How Much Does a Plumber Cost? (2026 Data)," updated Mar 17, 2026 (hourly standard; flat rates $100–$400; toilet repair $100–$300)

This is general information, not legal or financial advice. Consumer protection and contract rules vary by state. Check your local requirements.