Regulated Buy-to-Let Mortgage: Renting to Family Explained (Lender Criteria Guide)

If you’re considering renting out a property to a close family member, a standard buy-to-let mortgage may not be suitable.

Instead, you may need a regulated buy-to-let mortgage, also known as a family buy-to-let mortgage.

These mortgages are designed for landlords who plan to let their property to a relative, ensuring that the arrangement meets financial regulations.

Regulated buy-to-let mortgages differ from conventional buy-to-let loans because they are subject to stricter criteria, typically requiring a deeper affordability assessment.

Understanding these requirements is essential to securing the right mortgage for your needs.

Getting the mortgage structure wrong can delay your purchase or cause issues when remortgaging later.

Not sure if you need a regulated buy-to-let mortgage?

If you’re planning to rent a property to a family member, the type of mortgage you need can change completely. Getting this wrong could limit your lender options or even lead to your application being declined.

At Kerr & Watson, we help you understand whether a regulated buy-to-let mortgage applies to your situation and match you with the right lenders from the outset. Speak to us today to explore your options.

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What is a Regulated Buy-to-Let Mortgage?

A regulated buy-to-let mortgage is a type of mortgage used when you rent a property to a close family member, such as a parent, child, or sibling.

Unlike standard buy-to-let mortgages, these are regulated by the Financial Conduct Authority (FCA) because they are not considered a purely commercial investment.

For many lenders, this type of mortgage falls outside standard buy-to-let criteria.

This means lenders assess the mortgage more like a residential loan, focusing on your personal income and affordability rather than just rental income.

Regulated vs standard buy-to-let mortgages

A regulated buy-to-let mortgage works differently to a standard buy-to-let mortgage.

With a regulated buy-to-let mortgage:

Used when renting to close family
Regulated by the Financial Conduct Authority (FCA)
Based mainly on your personal income
Fewer lenders available
Stricter affordability checks

With a standard buy-to-let mortgage:

Used for renting to non-family tenants
Usually not regulated
Based mainly on rental income
Wider lender choice
More flexible criteria

Understanding this difference is essential, as applying for the wrong type of mortgage could lead to delays or a declined application.

When do you need a regulated buy-to-let mortgage?

You will usually need a regulated buy-to-let mortgage if:

You plan to rent the property to a close family member
The family member will occupy a significant portion of the property (typically over 40%)
The arrangement is not purely commercial

If these conditions apply, a standard buy-to-let mortgage is usually not suitable and could put you in breach of your lender’s terms.

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Why Do Lenders View Regulated Buy-to-Let as Riskier?

Lenders often consider regulated buy-to-let mortgages higher risk than standard buy-to-let lending:

Rental payments may be lower – landlords may offer discounted rent to family members, reducing the expected rental yield.
Missed payments may not be enforced – family members may be less likely to enforce late rent payments or eviction of the tenant, increasing lender risk.
Affordability is assessed differently – instead of focusing on rental income, lenders often consider your personal income, making it harder to qualify. This can vary by lender, so it’s important to take advice based on your situation.

Because of this, lender availability is more limited and criteria are often stricter.

How much can you borrow with a regulated buy-to-let mortgage?

Borrowing is usually based on your personal income rather than rental income.

Lenders may:

Use income multiples similar to residential mortgages
Assess your full affordability including existing commitments
Consider rental income, but not rely on it fully

This means you must be able to afford the mortgage even if rental income is reduced or not received.

Eligibility Criteria for a Regulated Buy-to-Let Mortgage

Lenders have specific requirements for regulated buy-to-let mortgages. Some common criteria include:

Age requirement – Typically, applicants must be between 25 and 75 years old depending on the lender.
Personal income assessment – You are likely to need to earn at least £25,000 per year outside of rental income.
Deposit requirements – Most lenders require a 25% to 40% deposit depending on criteria and expected rent.
Loan term limitations – Many lenders cap the term at 25 years.

When might a regulated buy-to-let mortgage not be possible?

This type of mortgage may not be suitable if:

Your income is not sufficient to meet affordability
The lender does not offer regulated buy-to-let products
The rental arrangement is unclear or informal
You cannot evidence a clear tenancy structure

In these cases, alternative options may need to be considered.

What Happens if You Have the Wrong Mortgage Type?

If you rent to a family member under a standard buy-to-let mortgage without informing your lender, you may be breaching your mortgage terms. This can lead to:

The lender demanding immediate repayment of the loan which may mean selling the property if you can’t refinance.
Difficulties remortgaging or applying for further credit in the future, or the lender leaving you on their standard variable rate at a high cost.

If your circumstances change (for example, if your tenant is no longer a family member), you may be able to switch to a standard buy-to-let mortgage. Speaking with a mortgage broker ensures you remain compliant with lender requirements.

In some cases, lenders may require the mortgage to be repaid if terms are breached.

Why standard buy-to-let mortgages may not be suitable

Most buy-to-let mortgages are designed for properties rented on standard tenancy agreements to non-family members.

If your mortgage does not allow renting to family, you could:

Breach your mortgage terms
Limit your ability to remortgage
Face stricter lender conditions later

This is why confirming the correct mortgage type before proceeding is essential.

How Kerr & Watson Can Help

Applying for a regulated buy-to-let mortgage can be complex, especially since fewer lenders offer these products.

At Kerr & Watson, we specialise in finding tailored mortgage solutions to fit your circumstances. Here’s how we can assist you:

Identify suitable lenders – We work with lenders who offer regulated buy-to-let mortgages and can match you with the right option. We also work with the standard buy-to-let lenders so we can assess what is most suitable for you.
Streamline the application process – We help you gather the necessary documents prior to your application, which helps towards a smoother application process.
Assess your affordability – Our team will review your income and advise you on the best approach to meet lender criteria.

Conclusion

A regulated buy-to-let mortgage is essential if you plan to rent out a property to a close family member who will occupy a significant portion of the home.

Since these mortgages are subject to FCA regulations and stricter affordability checks, they can be more challenging to secure than standard buy-to-let loans.

Working with a mortgage broker like Kerr & Watson ensures you find the right lender and the best possible deal for your individual circumstances.

Need help arranging a regulated buy-to-let mortgage?

At Kerr & Watson, we specialise in complex buy-to-let scenarios, including renting to family members. We’ll help you structure your application correctly and find lenders who will consider your case.

Speak to us today to secure the right mortgage from the start.

Written by Daniel Watson, CeMAP, DipMAP
Published: 31 March 2023 | Last updated: 23 April 2026

The information on this page is not tailored to any individual readers and should not be considered financial advice under any circumstances.

If you are seeking advice about a mortgage, you should speak with a qualified advisor.

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