The Portfolio Remortgage Guide
As fixed rates roll off across a portfolio, remortgaging is where a landlord either quietly loses margin or actively wins it back. Here is how to do it well.
A portfolio remortgage is refinancing one or more buy to let properties within a portfolio, either individually or together, usually as fixed rates end or to release equity. Because you are a portfolio landlord, each remortgage is underwritten on a whole-portfolio basis: the lender assesses the aggregate rental income, values and gearing across your entire book, not just the property being refinanced.
At a glance
- What it isRefinancing buy to lets within a portfolio, as rates end or to raise capital
- Underwritten onThe whole portfolio, not just the property refinanced
- Common triggersFixed rate ending, capital raising, consolidating lenders
- Key documentsPortfolio schedule, rents, balances, values
- Watch forEarly repayment charges on deals still in a fixed period
- Typical max LTVAround 75 percent on standard buy to let
What is a portfolio remortgage?
A portfolio remortgage is the refinancing of buy to let properties held within a landlord's portfolio, whether that means moving a single property to a new deal or refinancing several at once. The most common trigger is a fixed rate coming to an end: when a two or five-year fix expires, the property reverts to the lender's higher standard variable rate, and remortgaging onto a new fixed deal protects the margin. The second common trigger is capital raising, remortgaging to a higher loan to release equity for the next purchase.
What makes it a portfolio remortgage, rather than an ordinary buy to let remortgage, is that you are a portfolio landlord, so the whole-portfolio underwriting rules apply. Even if you are only refinancing one flat, the lender will want to see your entire portfolio and will assess the case against the health of the whole book.
A portfolio built up over years tends to have fixed rates ending at different times, so remortgaging is not a one-off event but a rolling programme. Landlords who plan renewals ahead, rather than reacting as each deal lapses onto a reversion rate, keep far more of their margin.
How a portfolio remortgage works
The process mirrors whole-portfolio underwriting. You provide a current portfolio schedule, the lender values the property or properties being refinanced, and it runs both the single-property stress test and its aggregate checks across the book before offering terms.
- Review which fixed rates are ending and when, and identify any early repayment charges.
- Prepare a current portfolio schedule: values, balances, rents and lenders for every property.
- Choose whether to refinance individually, in tranches, or under a single facility.
- The lender runs the interest cover ratio on each property and the aggregate portfolio tests.
- It offers terms, and you complete, ideally timed for when the old rate ends to avoid a reversion or an early repayment charge.
The stress test that each property must clear is covered in the buy to let stress test explained, and you can model how a remortgage lands against the whole book with our portfolio LTV and ICR calculator.
Are portfolio remortgages cheaper?
Not inherently cheaper than a single buy to let remortgage on rate alone, but a portfolio remortgage handled well can be cheaper in total and more efficient to run. Refinancing several properties with one specialist lender can align renewal dates, reduce duplicated legal and valuation work, and let the lender price on the strength of the whole portfolio. Whether it beats keeping properties spread across different lenders depends on the rates available and the fees involved, which is a calculation worth doing case by case rather than assuming.
The bigger saving is usually timing, not structure. Letting a property drift onto a standard variable rate for even a few months after a fix ends can cost far more than any difference between remortgaging together or separately. Getting the new deal lined up before the old one lapses is where the money is.
If a property is still inside its fixed period, remortgaging early usually triggers an early repayment charge that can wipe out any rate saving. Time a portfolio remortgage for when deals are ending, or check that the saving genuinely exceeds the charge before moving early.
Remortgaging to release equity
A portfolio remortgage is also the main way landlords raise capital from what they already own. As values rise and balances fall, equity builds up in the portfolio; remortgaging to a higher loan releases some of that equity as cash, typically to fund the deposit on the next purchase, without selling anything. The lender still applies its maximum portfolio loan to value and the stress test, so how much you can pull out depends on the rent and the gearing across the book.
This is a big enough topic to have its own guide: see releasing equity from a portfolio for the detail, and our portfolio landlord finance hub for how remortgaging fits the wider strategy. When you are ready, our portfolio mortgages and portfolio landlord mortgages pages set out how we place these cases.
Buy to let and portfolio remortgaging for landlords and investors is predominantly unregulated business lending. We arrange and introduce finance; we are not a lender and do not give tax advice. Where a case falls inside the FCA regulated mortgage perimeter, we refer it to an authorised firm.
- Portfolio remortgage
- Refinancing one or more buy to lets within a portfolio, underwritten on a whole-portfolio basis, usually as a fixed rate ends or to release equity.
- Reversion rate
- The lender's standard variable rate a mortgage reverts to when its fixed or introductory period ends, usually higher than a new fixed deal.
- Early repayment charge (ERC)
- A fee for repaying or refinancing a mortgage before its fixed period ends, which can outweigh any rate saving from remortgaging early.
- Capital raising
- Releasing equity by remortgaging to a higher loan, to fund a purchase or other use without selling a property.
The Portfolio Remortgage Guide: common questions
How do portfolio mortgages work?
Because you hold four or more mortgaged buy to lets, each mortgage and remortgage is underwritten on a whole-portfolio basis. The lender assesses the aggregate rental income, values and gearing across your entire book, applying both a single-property stress test and overall portfolio limits, before offering terms.
Are portfolio mortgages cheaper?
Not inherently cheaper on rate, but a portfolio remortgage handled well can be cheaper in total: refinancing with one specialist lender can align renewals, cut duplicated legal and valuation work, and let the lender price on the whole portfolio's strength. Whether it beats spreading properties across lenders depends on the rates and fees, so it is worth comparing case by case.
When should I remortgage my portfolio?
Usually as fixed rates end, timed so the new deal completes before the old one reverts to a higher standard variable rate. Remortgaging early, while still inside a fixed period, tends to trigger an early repayment charge that can outweigh the saving, so plan renewals ahead across the portfolio.
Can I remortgage my portfolio to release equity?
Yes. Remortgaging to a higher loan releases equity built up as values rise and balances fall, commonly to fund the next deposit without selling. The amount depends on the lender's maximum portfolio loan to value and the rent, tested through the interest cover ratio.
Do I have to remortgage the whole portfolio at once?
No. You can refinance a single property, a tranche, or the whole book under one facility. Even refinancing one property, the lender will still assess your whole portfolio, but you choose which deals to move and when, typically driven by when each fixed rate ends.
Refinancing or growing a portfolio?
Send us the portfolio schedule, the rents and the balances and we will come back with a view on structure, lender appetite and likely terms within one working day.