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The guarantor mortgage specialists

Advice on 25+ budget-boosting schemes

Boost your affordability with a guarantor mortgage

See how you could boost your borrowing power and get on the ladder sooner with a guarantor mortgage or family-assisted mortgage.

Boost your budget by £82,000 on average
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Best Mortgage Broker 5 years running

Dedicated mortgage team by your side

Rated 4.8/5 on Trustpilot

Best Mortgage Broker 5 years running

Dedicated mortgage team by your side

Rated 4.8/5 on Trustpilot

What is a guarantor mortgage?

A guarantor is someone who supports your mortgage application, using their income, savings or property as security. Also known as a family-assisted mortgage, guarantor mortgages are a great solution for someone who is struggling to afford the home they want to buy, either because they haven't got enough saved up as a deposit, or they can't borrow enough on their income.

How does a guarantor mortgage work?

A guarantor mortgage works like a standard mortgage, but instead of securing the loan solely against the property you're buying, a guarantor provides extra security with their savings, income or home equity. If you pay on time, your guarantor's collateral is released after the agreed period, but if you miss payments, the guarantor becomes legally responsible for covering them.

Read our full guide on how guarantor mortgages work for the different types, deposit requirements, and how much you could borrow.

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What types of guarantor mortgages are there?

Income Boost

Use a loved one's income to boost your borrowing

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Savings as Security

Use a loved one's savings as security

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Deposit Boost

Unlock money from their home to boost your deposit

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Why use Tembo?

Voted Britain's Best Mortgage Broker five years running, we are specialists in a range of guarantor mortgages that could help you buy sooner or boost your budget. But don't just take our word for it. Watch some of our customer stories to see how we helped them make home happen, even against the odds.

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Single income first-time buyer

Buying with complex income

Using income to boost affordability

Remortgaging to gift a deposit

Acting as a silent guarantor

★★★★★

Billy and Jodie were so helpful in managing to find a rare Income Boost mortgage to help me finally get my son onto the property ladder. They were responsive to all my queries, giving clear and concise information in person without delay. I felt in safe hands and would highly recommend."

G Marshall

Guarantor, May 2025

★★★★★

"We were looking to apply for an Income Boost mortgage, using our parents to boost our affordability. I was on a PhD stipend and a zero-hours contract; my partner had just been made redundant. So it was a very complicated case! Our Tembo broker Luke worked tirelessly, giving us lots of options and helping us to apply for mortgages within two hours."

Timothy Ward

First-time buyer, April 2026

★★★★★

"Tembo were incredibly helpful in securing an Income Boost mortgage for my daughter (with me as the 'booster'). They guided us through the process clearly and carefully, really fast to respond and happy to book in a call at short notice if anything cropped up that we wanted extra clarification on. We're really happy with the service we received."

Sarah Casey

Guarantor, August 2025

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