What percentage deposit can a plumber ask for in California?

California's contractor board says a home improvement down payment cannot be more than $1,000 or 10 percent of the contract price, whichever is less, as of November 2026. Payments also cannot exceed the value of work performed. Other states have different rules.

Is half down normal for plumbing work?

No figure found for this page shows what is normal, so treat that as a claim to question. In Maryland, half would exceed the one-third cap on contracts its commission covers. Elsewhere, ask for a smaller amount or payments that follow finished stages.

Should a plumbing deposit be paid before signing anything?

Get the paper first. Maryland's commission says a contractor may not accept any payment until the contract is signed. Even where no such rule was found, the FTC suggests asking for a written agreement. Your state rules may add more.

Does a big replacement make a bigger deposit acceptable?

It can, since more is at stake for the firm, but state caps still apply. One quote or three covers how to set those side by side.

Planning / Deposit or No deposit

Pay a deposit or none at all?

How much deposit a plumber can ask for depends on state and contract. California and Maryland cap home improvement deposits; ask if yours counts. For a short repair, paying nothing up front is fair. A special order may justify a small written deposit.

Updated November 4, 2026. Sources are listed at the foot of this page.

Find your line

If it is a short repair with common partsNo depositThe firm buys little ahead for you, so paying after the work is a fair ask.
If a unit must be ordered just for your houseDepositA special order is a real cost to the firm; keep the amount small and written.
If you are in California under a home improvement contractDepositThe cap is $1,000 or 10 percent, whichever is less, as of November 2026.
If you are in Maryland under a home improvement contractDepositThe cap is one third of the contract price, and nothing is payable before signing.
If they want cash, or most of the price, before work startsNo depositThe FTC says not to pay the full amount up front; find another firm.

Two tankless water heaters on a gray wall — Tankless water heaters on an outside wall.

What do the deposit rules say in each place?

	Deposit	No deposit
California home improvement contract, as of November 2026	Up to $1,000 or 10 percent, whichever is less	No cap issue; payments still cannot outrun finished work
Maryland home improvement contract, as of November 2026	Up to one third of contract price, after signing	No cap issue; nothing is owed before a signed contract
New York home improvement contract	Progress payments go in escrow or are bonded; no cap found	Hold final payment until required inspections are finalized
Washington	A large deposit is a listed warning sign	Cash-only demands are also a listed warning sign
Everywhere else	Your state may differ; check before paying	Your state may differ; a written estimate still helps
Your risk	Money is gone before any work is done	The firm may not reserve a slot or order parts

Sources for this table: CSLB, Maryland MHIC, New York AG, Washington Labor & Industries

When would a deposit make more or less sense?

The part cannot be returned once ordered, which makes a deposit easier to justify.
The firm asks for more than a cap that covers your contract. Ask the California or Maryland board whether your job counts as home improvement.
The payment is to go in a person's name rather than the business, a warning sign in Washington.
The price grows mid-job. California requires a signed written change order, so ask for the same paper wherever you live.
Your state is not named here. Check state rules before paying anything.

How much money should go out before the work starts?

Nothing found for this page sets a national deposit rule, and no dated survey of typical plumber deposits was found. The FTC offers three national pointers: some states limit down payments, nobody should hand over the whole price at the start, and the last payment belongs after the work is done and you are happy with it. This is general information, not legal advice.

For scale, Bob Vila's plumber cost roundup, a 2023 survey summary last updated that June from HomeAdvisor data, put a standard water heater install at $850 to $1,650 and tankless at $1,220 to $3,500. Those national numbers are over three years old, so expect local quotes to differ and perhaps run higher. If California's home improvement cap, as of November 2026, covers the contract, 10 percent of that $1,650 is $165, far below the $1,000 ceiling. Whether a given plumbing job counts is a question for the board.

Equipment is the usual reason a deposit comes up. Plumbing Supply and More, run by the same team as this site, has a hybrid heat pump water heater section that shows the kind of less common unit worth asking about. Ask your plumber whether a given model is stocked or ordered in. You can buy anywhere.

Low bungalow with a white car in the driveway — A low bungalow behind a clipped hedge.

Who holds your money, and who answers if it goes wrong?

Check the business before the money moves, because a deposit is only as safe as the firm holding it. In Washington, plumbing businesses must be licensed as plumbing contractors with the state Department of Labor & Industries. Maryland's Guaranty Fund states: "The Fund applies only to work done by licensed contractors." So an unlicensed job there has no such fund behind it. Plumber licensing in Maryland itself could not be confirmed. See licensed or unlicensed for other states.

A card leaves more options if the deposit vanishes; see card, check or cash and, for a cancelled job, cancel or keep the contract.

Words to use

"Does this job need a deposit, and what exactly would it pay for?"

"Please write the deposit amount, the payment schedule and the finish date into the estimate."

"Is this water heater in stock, or does it get ordered just for this job?"

"If the part never arrives or the job gets cancelled, how does the deposit come back?"

From Utah's commerce department, on pressure tactics, large down payments and written agreements. The resources it names are for Utah. Loads from YouTube only if you press play. 4 minutes 58 seconds.

Also asked

What percentage deposit can a plumber ask for in California?: California's contractor board says a home improvement down payment cannot be more than $1,000 or 10 percent of the contract price, whichever is less, as of November 2026. Payments also cannot exceed the value of work performed. Other states have different rules.
Is half down normal for plumbing work?: No figure found for this page shows what is normal, so treat that as a claim to question. In Maryland, half would exceed the one-third cap on contracts its commission covers. Elsewhere, ask for a smaller amount or payments that follow finished stages.
Should a plumbing deposit be paid before signing anything?: Get the paper first. Maryland's commission says a contractor may not accept any payment until the contract is signed. Even where no such rule was found, the FTC suggests asking for a written agreement. Your state rules may add more.
Does a big replacement make a bigger deposit acceptable?: It can, since more is at stake for the firm, but state caps still apply. One quote or three covers how to set those side by side.

Next decision in planningLicensed plumber or someone cheaper without a license?

Sources

What Is a Contract, CSLB California down payment cap and payment timing
MHIC Contracts Maryland one-third cap, no payment before signing
Maryland Home Improvement Commission Guaranty Fund limited to licensed contractors
Hiring a Home Improvement Contractor, New York AG Escrow or bond for progress payments
Home Improvement Advice, New York AG Final payment waits for inspections
Hiring a Plumbing Contractor? Hire Smart!, Washington Labor & Industries Large deposit and cash-only warning signs
Licensed Plumbing Contractor, Washington Labor & Industries Who must hold a plumbing business license
How To Avoid a Home Improvement Scam, FTC Down payment limits, final payment timing
How Much Does a Plumber Cost?, Bob Vila Heater install ranges from June 2023