What could you lose without a prenup?

Not automatically, but the family home is treated as matrimonial property, so it usually falls within the sharing principle whoever bought it or paid the deposit which is why this calculator counts around half of it as on the table. A prenuptial agreement is how couples record a different intention for a home one of them brought in.

Largely, yes. Following Standish v Standish (2025), assets you bring in pre-marriage savings, a business, a pension, or an inheritance, are non-matrimonial and not subject to sharing. A prenup records your intention to keep them separate, which is exactly what makes the ring-fence effective. The one thing it cannot exclude is the other person's needs.

Largely, yes, but not absolutely. Following Standish v Standish (2025), an inheritance is non-matrimonial property and isn't subject to sharing, as long as it's kept separate rather than mixed into joint finances. A prenup records that intention; the one thing it can't exclude is the other person's needs.

A solicitor-drafted prenup typically costs £1,500–£3,000 or more, before each partner's own independent advice. Our guided online prenuptial agreement is a fixed £199, drafted to the standards the courts look for.

Matrimonial property is what you build up together during the marriage, including the family home, and is usually shared. Non-matrimonial property is what you bring in or receive separately: pre-marriage savings, a business, a pension or an inheritance. Since Standish v Standish (2025) it isn't subject to sharing, though needs can still reach it. This calculator weighs each asset on that basis you can also check whether your prenup would stand up.