How much should I charge for a service call?

$75–150 is typical, covering drive time and diagnosis. Repair labor bills separately once the customer approves the quote.

How much does water heater replacement cost in 2026?

A standard 40–50 gallon gas or electric tank replacement runs $1,400–$2,600 installed, including the unit ($550–$1,200), permit ($75–$200), labor (3–5 hours), disposal of the old tank, and code-required updates like a new T&P valve, expansion tank, or drain pan. Tankless swaps run $3,500–$6,500 because of venting and gas line upsizing. Use the calculator above to price parts + labor + overhead, then apply your target margin so the price you quote actually keeps the profit you plan.

How do I calculate true margin on a water heater swap?

A swap looks like an easy win but hides callback risk. Total your unit cost, permit, all fittings (dielectric unions, flex connectors, expansion tank, drain pan, new T&P discharge line), and 3–5 labor hours. Add your overhead percentage — this is where truck stock, insurance, and the return-trip risk gets covered. Then divide by (1 − target margin) to get your bid. On a $1,300 total cost with 25% target margin, that's a $1,733 bid — not $1,300 + 25%, which would only net ~20%.

What line items should a water heater replacement bid include?

Break it out so the customer sees value: (1) new water heater unit and warranty tier, (2) removal and disposal of old tank, (3) all new supply lines, shutoffs, and dielectric unions, (4) expansion tank if required by code, (5) new T&P valve and discharge piping, (6) drain pan for interior installs, (7) permit and inspection handling, (8) labor at your hourly rate, (9) one-year workmanship warranty. A clear itemized bid wins against low-ball competitors who bury callbacks in a single line.

Should I bid tank vs tankless differently?

Yes. Tankless has 2–3× the labor (gas line upsize, new venting, sometimes electrical) and higher parts cost, but commands a $2,000–$4,000 premium over a tank swap. Present both as options in your bid — Bid Buddy Pro's proposal writer can generate a good/better/best comparison automatically.

Plumbing bids that cover the truck, the license, and the callback

Plumbing carries the same real overhead as electrical — plus emergency calls. Bid Buddy prompts you to price service calls, materials markup, and warranty callbacks separately so nothing hides.

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Your bid

Target profit margin

Your bid is calculated as total cost ÷ (1 − margin) for a true margin.

Total job cost

$23,000.00

Recommended bid

$28,750.00

Profit

$5,750.00

Margin

20%

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Truck stock

Fittings, valves, PEX, copper — mark up 40–60% to cover the pieces you don't sell.

Service call fee

Non-negotiable. Diagnosis time is billable even before repair starts.

Permit / inspection

Line-item at cost plus handling.

Markup & margin for plumbing

Plumbing contractors typically use 50–100% markup on parts and $100–160/hr labor to net 20–30% after overhead.

Line items to include in every plumbing bid

Service call fee
Diagnosis time
Labor (per hour)
Parts + markup
Fixtures
Permit + handling

Frequently asked questions

Guides that go deeper

The calculator gives you the number. These walk through where each number comes from.

See other trades

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All trade guides Markup vs. margin guide