There is no set price tag for a California prenup, and no filing fee, because a premarital agreement is a private contract between two people, not a court document. What drives cost, and what determines whether the agreement actually holds up later, is how carefully it follows California's specific enforceability rules.
Key Takeaway: California follows the Uniform Premarital Agreement Act (Family Code Sections 1610 to 1617). An agreement can cover property and support, but it cannot decide child support in advance, and a spousal support waiver only holds up if the person giving it up had independent legal counsel when they signed. Signed on or after January 1, 2020, every agreement also needs at least seven calendar days between being presented and being signed.
How Much Does a Prenup Cost in California?
California courts do not publish a fee schedule for premarital agreements the way they do for filing a divorce petition, because a prenup is negotiated and signed before marriage, outside the court system entirely. There is no official statewide number to point to.
What actually drives the cost is attorney time. Family Code Section 1615 makes an agreement significantly harder to enforce later if the party against whom it is enforced did not have independent legal counsel, so most people who want a prenup that will actually hold up in a divorce years later budget for two separate attorneys: one for each spouse. Cost from there depends on how much property and income needs to be disclosed and negotiated, and whether the agreement is a short, simple document or a detailed one addressing a business, real estate, or significant separate property. Confirm current pricing directly with a California family law attorney rather than relying on a flat number, since it varies by complexity and by firm.
What Makes a California Prenup Enforceable?
Under Family Code Section 1615, a court will not enforce a premarital agreement if the party against whom it is being enforced proves either that they did not sign it voluntarily, or that it was unconscionable when signed and they were not given full financial disclosure. To count as voluntary, the agreement generally has to meet all of the following:
- The party against whom it is enforced was represented by independent legal counsel at signing, or was advised to seek counsel and expressly waived that right in a separate signed writing
- That advisement to seek counsel happened at least seven calendar days before the final agreement was signed
- For agreements signed on or after January 1, 2020, there were at least seven calendar days between being presented with the final agreement and signing it, whether or not that party had a lawyer
- The party was not coerced and understood the rights they were giving up
Full and fair disclosure of each party's property and financial obligations is also required, unless it was expressly and voluntarily waived in writing. A court decides whether an agreement is unconscionable as a matter of law, not something either party simply asserts.
Do You Need a Lawyer for a California Prenup?
You are not legally required to have a lawyer to sign a premarital agreement in California. But the law treats certain provisions differently depending on whether you had one.
Family Code Section 1612(c) is direct on one point: a spousal support provision, including a full waiver of support, is not enforceable at all if the party against whom it is being enforced was not represented by independent counsel at the time they signed. That single rule is the biggest reason most people budget for two attorneys rather than one shared one. Representation by counsel alone also does not automatically make an otherwise unconscionable spousal support waiver enforceable.
For provisions outside of spousal support, such as how property will be characterized or divided, going without a lawyer does not automatically void the agreement, but it does make it easier for the other party to later argue the agreement was not signed voluntarily under the Section 1615 standard above.
What About a Postnuptial Agreement?
California does not have a separate statute specifically labeled "postnuptial agreement." An agreement signed after the wedding is instead a transaction between spouses, and Family Code Section 721 already puts spouses in a confidential, fiduciary relationship once married, requiring the highest good faith and fair dealing and full disclosure between them for any transaction concerning their property.
Because that fiduciary standard applies automatically once you are married, courts tend to scrutinize a postnuptial agreement closely, often more closely than a premarital one, particularly on disclosure. That generally means similar or greater attorney involvement, and similar or greater cost, compared to a prenup covering the same issues.
What Can't a California Prenup Control?
Family Code Section 1612 lists what a premarital agreement can cover: rights in property, the right to manage and dispose of property, what happens to property on separation, death, or divorce, wills and trusts tied to the agreement, life insurance ownership, choice of law, and other personal rights not against public policy.
The clearest limit is child support. Section 1612(b) states plainly that a child's right to support cannot be adversely affected by a premarital agreement. Custody and parenting time are not addressed by a prenup either; both are decided under the child's best interest standard at the time of a case, using the state's current guidelines, not terms agreed to before the child was born.
Common Mistakes to Avoid
- Signing the final agreement the same day it is presented, instead of allowing the required seven-day window
- Sharing one attorney between both spouses for an agreement that includes a spousal support waiver
- Leaving out full financial disclosure, or not documenting a written waiver of disclosure
- Assuming a prenup can set child support or custody terms in advance
- Treating a postnuptial agreement as lower-stakes than a prenup, when courts often scrutinize it more
Frequently Asked Questions
How much does a prenuptial agreement cost in California?
There is no official filing fee, because a premarital agreement is a private contract, not something you file with the court before marriage. Cost is driven almost entirely by attorney time: California's enforceability rules generally expect each party to have independent legal counsel review or negotiate the agreement, so cost scales with how much drafting and negotiation two attorneys need to do, not a set state schedule.
What is the state of California prenuptial agreement law based on?
California adopted the Uniform Premarital Agreement Act, codified at Family Code Sections 1610 through 1617. It sets out what a premarital agreement can and cannot cover, and the specific voluntariness, disclosure, and timing rules a court looks at when deciding whether to enforce one.
How much does a postnuptial agreement cost in California?
California does not have a separate statute or fee structure just for postnuptial agreements. Because spouses already owe each other a fiduciary duty under Family Code Section 721 once married, a postnup typically gets closer scrutiny than a premarital agreement, which can mean more attorney time on disclosure and documentation, and therefore comparable or higher cost than a prenup.
Do both people need their own lawyer for a California prenup to hold up?
Not in every case, but it matters most for certain provisions. Family Code Section 1615 treats an agreement as involuntary, and therefore unenforceable, unless the party against whom it is being enforced either had independent legal counsel or expressly waived that right in a separate signed writing after being advised to seek it. A spousal support waiver specifically is not enforceable at all unless that party was represented by independent counsel when they signed.
Can a California prenup decide child support in advance?
No. Family Code Section 1612(b) states directly that a child's right to support cannot be adversely affected by a premarital agreement. Custody and child support are decided under the child's best interest and the state guideline at the time, not by a contract signed before the child existed.
Is there a minimum waiting period before signing a California prenup?
Yes. Under Family Code Section 1615, for agreements signed on or after January 1, 2020, each party must have at least seven calendar days between first being presented with the final agreement and actually signing it, regardless of whether that party has a lawyer. Signing the same day it is presented is one of the more common reasons an agreement later gets challenged.
How Virdix Helps
A prenup itself is a private contract, not a court filing, so Virdix does not draft premarital or postnuptial agreements. Virdix does help once a marriage moves toward divorce or legal separation: preparing the Judicial Council forms, like the Petition and property declarations, and keeping your answers consistent across every form in the case, including where an existing agreement affects how property is characterized.
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This article is for informational purposes only and does not constitute legal advice. Virdix is a document preparation service, not a law firm, and does not provide legal advice. For advice about drafting or reviewing a premarital or postnuptial agreement, consult a licensed California family law attorney.
Sources: California Family Code Sections 721, 1610 through 1617 (leginfo.legislature.ca.gov)