Guarantor Mortgages: How They Work

A guarantor mortgage lets someone else — usually a parent or close family member — back your mortgage application. If you can't meet a lender's requirements on your own, a guarantor essentially promises to cover the payments if you can't. It's a significant commitment for the guarantor, and it's important both parties understand exactly what's involved.

How Guarantor Mortgages Work

In a traditional guarantor mortgage:

1. You apply for the mortgage in your name
2. A guarantor is named on the mortgage deed (but NOT on the property title)
3. The guarantor agrees to cover your mortgage payments if you fail to make them
4. The lender may take a charge against the guarantor's property or savings as security

The critical point: the guarantor doesn't own any share of your property. They take on the liability without the asset. This is what makes it such a big ask.

Types of Guarantor Arrangements

Traditional Guarantor Mortgage

The guarantor simply agrees to be liable for payments. If you default, the lender comes to them. Few lenders offer this in its purest form these days — most have evolved into one of the arrangements below.

Savings-Based Guarantor Mortgages

The guarantor deposits a lump sum (typically 10-20% of the property value) into a savings account held by the lender. This money acts as security. If you keep up payments, the guarantor gets their money back after a set period (usually 3-5 years), with interest. If you default, the lender can use these savings.

Barclays Family Springboard is a well-known example. A family member deposits 10% of the purchase price into a Barclays savings account for 5 years. You get a 100% mortgage (no deposit needed), and the helper gets their money back with interest after 5 years, provided all payments are up to date.

Property-Based Guarantor Mortgages

The guarantor puts their own property up as additional security. If you default, the lender could ultimately repossess the guarantor's home. This is the highest-risk option for the guarantor.

Who Can Be a Guarantor?

Lender requirements vary, but typically a guarantor needs to:

• Be a close family member (parent, grandparent, sometimes sibling)
• Be a homeowner (for property-based guarantees) or have substantial savings
• Have a good credit history — the guarantor is being assessed too
• Be able to afford the mortgage payments on top of their own commitments
• Be under a certain age — some lenders cap guarantor age at 70-75 at the end of the mortgage term
• Be a UK resident — most lenders require guarantors to be UK-based

What the Guarantor Needs to Know

If you're considering being a guarantor for someone, understand this clearly:

• You are legally liable for the mortgage payments if the borrower can't pay
• The debt will appear on your credit file and affect your borrowing capacity
• If the borrower defaults, your credit score will be affected too
• Your property or savings could be at risk, depending on the arrangement
• You typically can't withdraw from the guarantee during the initial period
• If the borrower and their partner split up, you may still be liable
• You should get independent legal advice — not from the borrower's solicitor

Which Lenders Offer Guarantor Mortgages?

The market has shifted over the years. True guarantor mortgages are less common, but related products exist:

• Barclays Family Springboard — savings-based, 100% LTV
• Tipton & Coseley Building Society — offer a family assist mortgage
• Loughborough Building Society — flexible on guarantor arrangements
• Aldermore — have offered guarantor products for adverse credit situations
• Family Building Society — designed specifically for family-supported purchases

Some specialist lenders also offer guarantor options for borrowers with adverse credit, where the guarantor's strength compensates for the borrower's credit issues.

Guarantor Mortgages with Bad Credit

If you have bad credit, a guarantor can significantly improve your options. The guarantor's strong credit and financial position can offset your adverse credit history. However:

• Not all lenders that accept guarantors also accept adverse credit
• The guarantor's position needs to be especially strong
• Rates will be higher than for a standard guarantor mortgage
• A specialist broker is essential to find the right lender

Alternatives to Guarantor Mortgages

Joint Borrower Sole Proprietor (JBSP)

This is becoming more popular than traditional guarantor mortgages. A family member goes on the mortgage application as a joint borrower (their income is included in affordability), but they're NOT named on the property title. They help you qualify but don't own any of the property. See our dedicated JBSP guide for details.

Gifted Deposits

Rather than guaranteeing the mortgage, the family member simply gifts you money for a deposit. This is simpler legally and doesn't put the guarantor at ongoing risk. The family member provides a gifted deposit letter and evidence of the funds' source.

Family Offset Mortgages

Some lenders allow a family member's savings to be offset against your mortgage balance, reducing your interest payments without the savings being at risk in quite the same way as a guarantee.

How to Exit a Guarantor Arrangement

Most guarantor arrangements allow the guarantor to be released after a set period, usually when:

• A certain number of years have passed (typically 3-5 years)
• You've built up enough equity through payments and/or property value increases
• You can demonstrate affordability on your own
• You remortgage in your sole name

For savings-based guarantors, the exit is cleaner — the savings are returned after the agreed period (assuming all payments are up to date).

Making the Decision

A guarantor mortgage can be the bridge between where you are and where you want to be. But it's a family decision with real financial consequences. Have honest conversations about worst-case scenarios, get independent legal advice for both parties, and explore all alternatives before committing.

This is educational content, not financial advice. Your situation is unique — speak to a qualified mortgage broker before making any decisions.