Mortgage guide

Buy to let second charge mortgages

A buy to let second charge mortgage is a secured loan taken against a rental property that already has an existing first charge buy to let mortgage. It allows landlords to raise additional capital without refinancing the primary mortgage, subject to rental stress testing, loan-to-value limits, and lender criteria.

Get in touchCalculator

Buy to let second charge mortgages

Specialist buy to let second charge mortgage expertise

A buy to let second charge mortgage is a secured loan taken against a rental property that already has an existing first charge buy to let mortgage. It allows landlords to raise additional capital without refinancing the primary mortgage, subject to rental stress testing, loan-to-value limits, and lender criteria.

Mortgage Lane structures buy to let second charge solutions where re-mortgaging would trigger early repayment charges, disrupt favourable rates, or reduce borrowing flexibility.

Why consider a buy to let second charge?

Preserve your existing buy to let rate

Where the current first charge mortgage is on a competitive fixed or tracker product, a second charge enables capital raising without redeeming the original loan or incurring exit fees.

Raise capital against portfolio equity

Landlords can unlock equity tied up in a rental property to fund further acquisitions, refurbishment works, portfolio restructuring, or business investment, subject to combined loan-to-value limits.

Avoid full refinance underwriting

A second charge can be more efficient than a full re-mortgage where title changes, lease issues, or lender policy would otherwise complicate refinancing.

Portfolio landlord flexibility

Specialist second charge lenders assess rental income, interest cover ratios (ICR), and background portfolio exposure using buy to let underwriting principles rather than residential affordability models.

Regulatory and structural considerations

Buy to let second charges are typically unregulated where the property is an investment asset, though consumer buy to let rules may apply in specific circumstances. The first charge lender must be notified of the additional secured borrowing, and legal representation is required prior to completion.

Each case is structured to ensure rental income supports the total secured borrowing and remains aligned with lender stress testing requirements.

Residential calculator

Explore your borrowing

Enter your figures in pounds. Your estimate updates as you go.

Indicative maximum loan

-

Enter your figures to see an estimate.

Discuss your options
Indicative estimate only, subject to lender criteria and valuation. This is not a mortgage offer. Your property may be repossessed if you do not keep up repayments.

About the author

Joseph Lane CeMAP is an expert second charge mortgage broker

Founder, CEO

Calls and emails here go to Joseph personally, not to a general inbox.

Call JosephEmail Joseph

+44 7487 829005joe@mortgagelane.comMore about Joseph

View all case studies

Frequently asked questions

Can I take out a second charge mortgage to buy an Airbnb property?

A second charge mortgage is secured against a property you already own, in addition to your existing first mortgage, and can be used to release funds, including for an Airbnb property purchase. The new Airbnb property would still need its own separate first mortgage arrangement.

Do buy to let mortgages have early repayment charges?

Yes, most fixed-rate buy to let mortgages and some tracker products include early repayment charges during the initial deal period. These charges apply if the mortgage is repaid or switched early and are designed to reflect the lender’s funding costs over the agreed product term.

How to buy a second flat on mortgage?

You must meet affordability criteria including existing mortgage commitments. Higher deposits are commonly required for second homes or investment flats.

Can I buy a second house with a mortgage?

Yes. Lenders assess affordability including your existing mortgage commitments. Higher deposits are commonly required for second homes.

Can I remortgage to buy a second property?

Yes, you can remortgage your home to buy a second property, raising extra borrowing for the deposit, stamp duty and costs, or occasionally the whole price. The FCA's rules require the lender to take full account of your income and committed spending, so it assesses affordability on the new, larger mortgage with the second property's costs counted. Lenders set their own rules on which capital raising purposes they accept, including whether they accept a deposit for a buy to let, so the purpose is declared and checked with the lender before you apply. The second property usually has its own mortgage, assessed separately by its own lender.

Talk it through with an adviser

Speak to a Mortgage Lane adviser about your circumstances and the next steps.

Talk to an adviser

Let’s talk property finance

Contact us

Tell us about your plans and a Mortgage Lane adviser will get in touch.

Call our team
+44 333 231 8206
WhatsApp
+44 7487 829005
Opening hours
Monday to Saturday, 8.30am–5.30pm
Closed Sunday

Your enquiry goes to our team, who will get in touch to discuss your next steps.

Fields marked are required.

We use your details to respond to your enquiry and, if you opt in, send updates. See our privacy policy.