If your income or deposit alone is not quite enough, a guarantor or family-assist mortgage might bridge the gap by bringing a relative's support into your application. This guide explains guarantor and family-assist mortgages: the main types, how they help, the risks to the helper, and who they suit.
What a guarantor mortgage is
A guarantor mortgage involves someone, usually a parent or close family member, agreeing to cover your mortgage payments if you cannot. Their commitment reassures the lender, which may allow you to borrow when your own income or deposit would not be enough on its own. The guarantor does not usually own the property, but they take on real responsibility, so it is a significant commitment for them to make.
How a guarantor helps
A guarantor helps by reducing the lender's risk. With someone standing behind the mortgage, a lender may be willing to lend more, or to lend at all, to a first-time buyer with a limited deposit or income. This can make buying possible sooner than saving alone would allow. The trade-off is that the guarantor is legally on the hook if you fall behind, which is why it must be entered into carefully.
Family-assist and springboard mortgages
Family-assist or springboard mortgages let a family member use their savings or, sometimes, their own property as security to support your mortgage, often allowing a smaller deposit. The family member's money may be held in a linked account for a period and returned later, provided payments are kept up. These products go by various names, but the idea is similar: family support reduces the deposit hurdle without simply gifting the money.
Joint borrower sole proprietor mortgages
A joint borrower sole proprietor mortgage lets a family member be named on the mortgage, so their income helps you borrow more, while only you own the property. This can boost your borrowing without the family member becoming a legal owner, which can also avoid them facing an additional-property stamp duty charge. It is a popular way for parents to help children borrow more, though the family member shares responsibility for the debt.
Offset and savings-linked family mortgages
Some family-assist mortgages link a relative's savings to your mortgage. The savings may offset your mortgage, reducing your interest, or act as security. The family member keeps ownership of their savings, which are returned in time, rather than giving them away. This appeals to families who want to help but cannot or do not wish to gift money outright, since their capital is supporting you rather than being spent.
The risks to the helper
These arrangements carry real risks for the family member helping. A guarantor or named borrower can be pursued for payments if you fall behind, and savings or property used as security can be at risk. The helper should understand exactly what they are committing to and take their own advice. This is a serious financial commitment, not a formality, so it is vital that the helper goes in with their eyes open.
Who they suit
Guarantor and family-assist mortgages suit first-time buyers who can afford the monthly payments but lack the deposit or income history to qualify alone, and who have family able and willing to help. They are an alternative to a gifted deposit, as our guide to gifted deposits explains, useful when family want to help without giving money away. They also complement low-deposit options, as our guide to 95% mortgages covers.
Guarantor versus gifted deposit
A guarantor or family-assist mortgage differs from a gifted deposit. A gift gives you money outright, as our guide to gifted deposits explains, while a guarantor or family-assist arrangement uses a relative's income, savings or property as support without necessarily giving anything away. Families who want to help but cannot or prefer not to gift money often find these arrangements suit them, since their capital is supporting you rather than being spent.
When the family member is released
In many family-assist arrangements, the relative's commitment or linked savings can be released after a period, provided payments have been kept up and, often, once you have built enough equity. Knowing when and how the family member can step back is important to them. The timescale varies by product, so check the specifics, as it affects how long your relative's money or commitment is tied up.
What the helper should consider
Anyone acting as a guarantor or providing support should consider the commitment carefully: they could be liable for payments or have savings or property at risk if you cannot pay. They should take their own independent advice and be sure they can afford the worst case. This protects the relationship as well as their finances, since everyone goes in understanding the real risks rather than assuming nothing will go wrong.
Eligibility for these mortgages
Lenders have criteria for guarantor and family-assist mortgages, covering both you and the family member, such as the relative's income, equity or savings, and their own financial position. Not every lender offers them, and terms vary. Because these are more specialist, advice is particularly useful in finding a lender whose criteria you and your family member both meet, as our guide to low-deposit options notes.
An increasingly common route
With deposits a major hurdle, family help has become a common way onto the ladder, whether through gifts, guarantor arrangements or family-assist mortgages. If you have family able and willing to help, these options are worth exploring alongside saving and low-deposit deals. The right choice depends on what your family can offer and what they are comfortable with, so an open conversation and good advice both help.
Weigh the help against the commitment
For families, the decision to support a mortgage is about weighing the help it gives against the commitment involved. These arrangements can be the difference that gets a first-time buyer onto the ladder, but they ask something real of the relative, whether income, savings or a willingness to step in. An open conversation about the benefits and the risks, with proper advice on both sides, leads to a decision everyone is comfortable with.
A bridge, not a permanent tie
It helps to see family-assist mortgages as a bridge rather than a permanent arrangement. In many cases the relative's involvement or linked savings can be released after a few years, once you have built equity and shown you can manage the payments, as covered above. Viewed this way, family support is a temporary boost to get you started, after which you stand on your own as the sole borrower.
In short
Guarantor and family-assist mortgages use a relative's support, income, savings or property, to help you borrow when your own deposit or income is not quite enough. Types include guarantor, springboard, joint borrower sole proprietor, and savings-linked mortgages. They can make buying possible sooner, but they carry real risks for the family member helping, who should take their own advice. They suit buyers who can afford the payments but need help to qualify.
Where to get help and next steps
Read our guides to 95% and low-deposit mortgages, how much a first-time buyer can borrow, and gifted deposits. This is general information, not mortgage or financial advice.