Yes, it is possible to get a 100% mortgage in the UK, but usually with family support. Family Building Society has launched an enhanced Family Mortgage available up to 100% loan-to-value (LTV), giving first-time buyers and home movers a way to buy without a traditional deposit.
The new five-year fixed rate is priced at 5.19%, with no application or product fees, and offers borrowing up to 5.33 times income (LTI), subject to affordability. It is available on purchase applications only, with a maximum loan size of £750,000.
This move is likely to generate significant interest among buyers struggling to save for a deposit as UK property prices remain high.
Not sure how much deposit you’ll actually need? Get a free personalised borrowing assessment.
What Is a 100% Mortgage?
A 100% mortgage allows you to borrow the full purchase price of a property without putting down a deposit.
Historically, 100% mortgages were widely available before the 2008 financial crisis. Today, they are rare and usually structured with additional security, often provided by family members.
In the case of the Family Building Society Family Mortgage, the borrower does not need to provide an initial deposit. Instead, a family member supports the mortgage by providing security equivalent to 20% of the property value.
How Does the Family Building Society 100% Mortgage Work?
The enhanced Family Mortgage is designed to help buyers purchase a home with family assistance, rather than a gifted deposit.
Here’s how it works:
- Available up to 100% LTV
- Five-year fixed rate at 5.19%
- No product or application fees
- Up to 5.33x loan-to-income
- Maximum loan size of £750,000
- Purchase applications only
How Family Members Provide Security
Family members can support the mortgage in one of two ways, or a combination of both, provided the total security equals 20% of the property value:
Family Security Savings Account
The family member places savings into a dedicated account earning 3.05% AER variable.
Collateral Charge on Property
The building society can take a legal charge over the family member’s property for the required amount.
The security remains in place until the end of the fixed-rate period and is then released, subject to conditions.
Importantly, this structure avoids the need for a gifted deposit and allows parents, grandparents or other family members to help without permanently giving away savings.
Who Is a 100% Mortgage Suitable For?
A 100% mortgage may be suitable for:
- First-time buyers struggling to save a deposit
- Home movers with equity tied up elsewhere
- Buyers in high house price areas
- Families wanting to support a property purchase without gifting money outright
However, affordability checks still apply, and lending remains subject to the lender’s criteria.
Are 100% Mortgages Risky?
Borrowing 100% of a property’s value means you start with no equity. If property prices fall, you could move into negative equity.
That’s why lenders offering 100% mortgages often require additional security or family backing. These products are structured differently from high-risk pre-2008 lending models and are typically offered by specialist building societies rather than mainstream high street banks.
Professional mortgage advice is essential before considering this type of mortgage.
What Does This Mean for the UK Mortgage Market?
With the average UK property price remaining elevated, deposit affordability continues to be one of the biggest barriers to homeownership.
Products like this signal that lenders are exploring innovative ways to help buyers access the market, particularly in response to growing demand for:
- Low deposit mortgages
- Family-assisted mortgages
- Guarantor-style mortgage solutions
- 100% LTV mortgages
Louis Mason, Head of Marketing and Communications at Oportfolio Mortgages, said:
“Deposit affordability is one of the single biggest obstacles facing first-time buyers today. A structured 100% mortgage like this, where family members can provide security without gifting money outright, offers a practical and flexible solution. However, these arrangements are more complex than standard mortgages, so it’s crucial that both the buyer and the supporting family members fully understand the risks and responsibilities before proceeding.”
Can You Get a 100% Mortgage in 2026?
In summary:
- Yes, 100% mortgages are available.
- They typically require family support.
- They are subject to strict affordability and criteria checks.
- They are usually offered as specialist products rather than mainstream options.
- If you are searching online for:
- “Is it possible to get a 100% mortgage?”
- “Can I buy a house with no deposit?”
- “100% mortgage UK 2026”
- “Family assisted mortgage UK”
- The answer is that it may be possible, but only with the right structure and advice.
Speak to a Mortgage Broker About 90-100% Mortgages
Family-assisted, high loan to value and 100% LTV mortgages can be complex. Independent mortgage advice ensures:
- The product is suitable for your circumstances
- The affordability assessment is accurate
- The family security arrangement is fully understood
- Alternative low-deposit options are explored
At Oportfolio Mortgages, we help clients across London and the UK explore specialist mortgage solutions. Not sure how this applies to you? Get a free borrowing assessment.
