STATE GUIDE · UPDATED 2026
Every OurPrenup agreement is built for the laws where you live.
Start your Washington prenupYes — prenuptial agreements are legally enforceable in Washington under Washington law. To be valid, the agreement must be in writing, signed voluntarily by both partners, and made with fair financial disclosure. It should be notarized (strongly recommended, though not legally required), and both partners should have a real opportunity to review it well before the wedding.
Most property acquired during the marriage is owned 50/50 unless your agreement says otherwise.
Yes. Washington enforces prenuptial agreements under long-standing court decisions (case law). The agreement must be in writing and signed by both partners, entered into voluntarily, and made with fair financial disclosure.
Notarization is not strictly required in Washington, but strongly recommended — a notarized agreement is significantly harder to challenge in court, and OurPrenup's Washington signing instructions include it.
No — Washington does not require witnesses for a prenuptial agreement. Both partners' signatures (ideally notarized) are what matter.
In certain situations, yes — Washington requires independent counsel for some terms. For most couples it is strongly recommended but not mandatory; having each partner at least offered the chance to consult a lawyer makes the agreement much stronger.
Yes. Washington is a community property state — without an agreement, most property acquired during the marriage is owned 50/50. A prenup lets you set your own rules for what stays separate and what is shared.
Yes — Washington allows couples to set, limit, or waive spousal support in a prenup, subject to fairness review and statutory safety valves that protect a spouse from being left in hardship. OurPrenup offers a full waiver, payment formulas with amounts you choose, or leaving support to state law.
Washington takes disclosure seriously: each partner must give a full and fair picture of their assets, debts, and income before signing. Incomplete disclosure is the most common reason prenups get thrown out. OurPrenup builds sworn financial disclosure schedules for both partners into every agreement.
Washington has no fixed statutory deadline, but signing well before the wedding matters: agreements signed days before a wedding are the easiest to attack as pressured. Most attorneys recommend having the agreement finished at least 30 days before the wedding.
Attorney-drafted prenups in Washington commonly run $1,500–$5,000+ per couple. OurPrenup is a flat $599 per couple for a complete Washington-specific prenuptial agreement, financial disclosure schedules for both partners, a plain-language summary, and step-by-step Washington signing instructions — with optional online e-sign and notarization for $50.
Both parties review the final prenuptial agreement and all attached financial schedules.
Have each party's own independent attorney review the agreement before signing (strongly recommended).
Both parties sign the prenuptial agreement.
Have the agreement notarized. While Washington does not legally require notarization, we strongly recommend it. Notarized agreements are significantly harder to challenge in court.
Keep the original signed agreement in a safe location. Provide copies to both parties and their attorneys.
3 people total at signing
This guide is general information about Washington law, not legal advice. For advice on your specific situation, consult a licensed attorney in Washington. See our full legal disclaimer.
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