How Much Does a Prenuptial Agreement Cost in California?

How much does a prenuptial agreement cost when one or both of you bring a business, a trust, or unvested equity into the marriage? More than the figures most websites publish, because those figures describe a simple agreement between two people with few assets. Borna Houman Law advises clients on premarital agreements from our office at 2530 Wilshire Blvd in Santa Monica. If the agreement is ever challenged, it will be tested in a Los Angeles County family law department, at the Stanley Mosk Courthouse, the Santa Monica Courthouse, or Van Nuys.

A California prenuptial agreement for a complex estate costs well above the roughly $1,000 average flat fee published for simple drafts. The work includes separate counsel for each party, full financial disclosure, and the seven calendar days Family Code section 1615 requires between the final agreement and signing. Cost follows attorney hours spent on steps a court looks for.

A premarital agreement is only worth what a court will enforce 10 or 20 years later, and the steps that add cost are the steps a judge looks for.

How much does a prenuptial agreement cost in California?

Published figures for a simple California prenuptial agreement run from about $1,000 to $5,000, and published figures for a high net worth agreement start around $20,000. No statute sets the price. It depends on how many hours the two lawyers spend, and that depends on what the couple owns.

These are other publishers’ numbers, not a fee quote. The low figures and the high figures describe different work. The marketplace average of about $1,000 is a flat fee for one lawyer to draft a document, and it does not include the second lawyer, the disclosure, or any negotiation.

Why does a complex estate cost more to cover?

Because every asset class that needs its own clause also needs its own disclosure and its own negotiation. An agreement that addresses a founder’s company, a family trust, and a stock grant has to answer questions California law would otherwise answer by default.

Our guides to Pereira and Van Camp apportionment and to stock options and RSUs in a California divorce explain the default rules these clauses are written to replace.

What does the attorney time look like on a complex prenuptial agreement?

Most of it goes to disclosure, drafting, and negotiation. The table below illustrates how the hours can add up on a complex estate. It is not a quote and not a record of any client’s matter.

At the $410 statewide average hourly rate reported by Clio, 34 to 56 hours comes to $13,940 to $22,960 per side, or $27,880 to $45,920 for both. That is arithmetic on a published average, not this firm’s fee. Hourly rates vary by lawyer and by market, and outside professionals, such as a business appraiser or a tax advisor, are a separate expense.

In our experience, negotiation is the line that moves most. An agreement both parties have discussed before the lawyers start drafting takes far fewer rounds than one where the terms are a surprise.

Do both of you need your own lawyer?

In practice, yes. Family Code section 1615 deems a premarital agreement involuntary unless the party resisting enforcement was represented by independent legal counsel at signing or, after being advised to seek counsel, expressly waived representation in a separate writing.

An unrepresented party adds work. That party must be fully informed of the terms and basic effect of the agreement and of the rights and obligations being given up, must be proficient in the language of the explanation, and must receive the explanation in writing before signing. The party must also sign a document acknowledging receipt of the explanation and identifying who provided it.

Spousal support adds a second requirement. Under Family Code section 1612, a provision limiting or waiving spousal support is not enforceable if the party it is enforced against was not represented by independent counsel when the agreement was signed. Our guide to a spousal support waiver in a California prenup covers that test in detail.

That is why the budget is for two lawyers. It is common for the wealthier party to fund the other party’s counsel, and the lawyer who is paid that way still owes a duty only to the client.

How long does it take to get a prenup in California?

At least seven calendar days by statute, and in our experience two to four months for a complex estate. For an agreement executed on or after January 1, 2020, section 1615 requires that the party against whom enforcement is sought had not less than seven calendar days between the time that party was first presented with the final agreement and the time the agreement was signed, regardless of whether the party is represented by legal counsel.

The seven days run from the final agreement. The statute excepts only nonsubstantive amendments that do not change the terms, so a substantive change in the last week should be treated as restarting the period.

Courts apply the rule strictly. In In re Marriage of Clarke & Akel (2018) 19 Cal.App.5th 914, an unrepresented spouse received the final draft on March 5 and signed on March 6. The Court of Appeal held the agreement unenforceable and held that a recital in the document stating the party had seven days to review it was not binding.

Late starts add cost. When the wedding date is close, the lawyers work compressed hours, the disclosures arrive incomplete, and a final change can push the signing past the date. The agreements that cost the least for their complexity are the ones started at least three months before the wedding.

What makes a prenuptial agreement unenforceable in California?

Two things: the agreement was not signed voluntarily, or it was unconscionable when signed and the disclosure was inadequate. Section 1615 puts the burden of proving those grounds on the party resisting enforcement. It also deems the agreement involuntary unless the court makes five specific findings, which the Court of Appeal in Clarke & Akel described as an evidentiary burden on the party seeking to enforce it.

The unconscionability ground has three parts, and all three must be shown. The resisting party must prove no fair, reasonable, and full disclosure of the other party’s property or financial obligations, no voluntary written waiver of further disclosure, and no adequate knowledge of that property or those obligations. A complete disclosure schedule defeats the first, and with it the whole ground.

Some terms are unenforceable regardless of process. Section 1612 states that the right of a child to support may not be adversely affected by a premarital agreement. A spousal support waiver can also be refused if it is unconscionable at the time of enforcement, even where both parties had counsel.

The California Supreme Court’s decision in In re Marriage of Bonds (2000) 24 Cal.4th 1 explains why the process matters so much before the wedding. Parties who are not yet married are not presumed to share a confidential relationship, so the fiduciary duties that protect spouses do not yet apply. The statute’s procedural steps fill that gap.

Is a prenup easier to enforce than a postnuptial agreement?

In one respect, yes: before marriage neither party owes the other a fiduciary duty. Once you are married, Family Code section 721 imposes a duty of the highest good faith and fair dealing between spouses, and Family Code section 852 requires an express written declaration by the adversely affected spouse to change the character of property.

A postnuptial agreement that gives one spouse an unfair advantage raises a presumption of undue influence. In re Marriage of Burkle (2006) 139 Cal.App.4th 712 holds that the presumption arises only when the advantage is unfair, and the agreement in that case was enforced. Our guide to the postnuptial agreement in California covers the difference.

What should you ask before you hire a lawyer for a prenup?

Ask how the fee is calculated and get it in writing. Business and Professions Code section 6148 generally requires a written fee contract when it is reasonably foreseeable that the total expense to the client will exceed $1,000, with exceptions that include corporate clients and emergencies. The contract must state the basis of compensation, the general nature of the services, and the responsibilities of lawyer and client.

The State Bar of California explains what clients can expect on its page about attorney fees and billing. For a complex agreement, five questions set the budget.

1. Is the fee hourly or flat, and what is outside the flat fee?
2. Who prepares the financial disclosure schedules, and what documents are needed?
3. Will the lawyer coordinate with estate planning counsel and the company’s counsel?
4. How many negotiation rounds does the estimate assume?
5. What is the last date the final agreement can be delivered to keep the seven-day period before signing?

Estate planning belongs in that conversation. Section 1612 allows a premarital agreement to address the disposition of property on death, the making of a will or trust, and rights in life insurance death benefits. The Internal Revenue Service lists the federal estate tax basic exclusion amount for 2026 at $15,000,000 per person, and couples near or above that figure usually revise their estate plans alongside the agreement.

Frequently asked questions about the cost of a prenuptial agreement

Can you DIY a prenup in California?

Legally, yes. Family Code section 1611 requires only a writing signed by both parties, and no consideration. A self-drafted agreement still has to satisfy section 1615, and any spousal support limit is unenforceable against a party who had no independent counsel at signing.

Who pays for the prenup?

Each party retains separate counsel. Often the party with greater means pays both lawyers. The Rules of Professional Conduct permit that with the client’s informed written consent, provided the payment does not interfere with the lawyer’s independent judgment or the client’s confidences.

Does a California prenup have to be notarized?

No. Section 1611 requires a signed writing, not a notary. Acknowledgment matters if the agreement will be recorded, because Family Code section 1502 allows recording of an agreement that is executed and acknowledged like a grant of real property.

Who should consider a prenup?

Anyone bringing a business, real estate, trust interests, or equity compensation into a marriage, and anyone marrying a person with significant debt. Our guide on who needs a prenuptial agreement goes through the situations.

What happens without a prenup?

California’s default rules apply. Property acquired during marriage is generally community property and is divided equally, while property owned before marriage, and gifts and inheritances received during it, stay separate unless commingled. The Judicial Council summarizes those rules in its guide to property and debts in a divorce.

Can a prenup be changed after the wedding?

Yes. Family Code section 1614 allows a premarital agreement to be amended or revoked after marriage only by a written agreement signed by the parties, and no consideration is required.

Are legal fees for a prenup tax deductible?

Generally no. IRS Publication 529 lists legal fees for personal matters among nondeductible expenses. Ask a tax advisor about your own return.

Speak with a Los Angeles prenuptial agreement attorney

Borna Houman Law represents executives, founders, professionals, and trust beneficiaries across Los Angeles County. Read more on our prenuptial agreement attorney in Los Angeles page and our high net worth divorce attorney page.

Written by Borna Houman, attorney at Borna Houman Law, California Bar No. 352339, 2530 Wilshire Blvd, Santa Monica, CA.

This article is general information about California family law and is not legal advice. Reading it does not create an attorney-client relationship. The published price figures belong to the sources named and are not a fee quote, and the hours shown are an illustration. Every agreement depends on its own facts. Speak with a lawyer about your situation.