How many buy-to-let mortgages can I have?

There is no legal limit on how many buy-to-let mortgages you can have in the UK. The limits come from lenders. Most cap the number of buy-to-let loans or the amount of buy-to-let debt they will hold for one borrower. Some also cap how many mortgaged properties you can own across all lenders. Once you hold four or more mortgaged buy-to-lets, the regulator expects every lender to assess your whole portfolio before lending again. In practice, landlords build large portfolios by spreading their borrowing across several lenders. (Lender criteria checked October 2026.)

Why there is no fixed number

No UK law or regulator sets a maximum number of buy-to-let mortgages per person. The Prudential Regulation Authority’s Supervisory Statement SS13/16 sets underwriting standards rather than a ceiling.

Its main dividing line is four mortgaged properties. A borrower with four or more distinct mortgaged buy-to-lets, counted across all lenders, is a portfolio landlord, and lenders must underwrite them on the strength of the whole portfolio. That makes each application more demanding, but it does not stop you borrowing.

How lenders cap the number of buy-to-let mortgages

Lenders limit buy-to-let borrowing in three ways:

• a cap on how many loans you hold with them

• a cap on how much you owe them in total

• a cap on how many mortgaged properties you can own across every lender

Each lender sets its own mix, which is why the honest answer to “how many buy-to-lets can I have” depends on who you borrow from.

Table comparing UK buy-to-let lender limits on the number of mortgages, total borrowing and properties held across all lenders, October 2026.

Lenders change these limits regularly, so treat the table as a snapshot and check current criteria before applying. Our roundup of the best buy-to-let mortgage lenders shows which lenders actively take larger portfolios.

Can you get five buy-to-let mortgages?

Yes. Five buy-to-let mortgages is well within reach, but rarely with a single lender.

A common route is three loans with a mainstream lender that caps you at three, then a fourth and fifth with a lender that accepts experienced landlords. From the fourth mortgaged property onwards, each application goes through portfolio underwriting, so the fifth mortgage is judged on how the first four are performing as much as on the property you are buying.

What changes at your fourth mortgaged property

At four mortgaged buy-to-lets, each new application is assessed against everything you own, not just the property being financed. The lender looks at the rent and debt across your existing properties, applies its rental stress test to the portfolio as a whole, and asks for a property schedule listing every property, its value, its mortgage and its rent.

Landlords tend to underestimate this step. In our experience supporting landlords as they add their fourth and fifth properties, the delay rarely comes from the lender’s limits. It comes from producing figures for every property that reconcile with the bank statements behind them. Keeping income and costs per property in one place, with reports you can export for each property, makes that schedule a download rather than an evening’s work.

What really limits how many you can hold

For most landlords, affordability stops growth long before a lender’s count does.

SS13/16 tells lenders to stress-test rental income at a borrower rate of at least 5.5% over the first five years. The test uses the interest cover ratio, for which the PRA treats 125% as the industry minimum. Higher-rate taxpayers borrowing in their own name usually face 145%.

Deposits matter just as much. Most mainstream lenders lend up to 75% loan to value, so each purchase typically needs a 25% deposit plus the stamp duty surcharge. Lenders also check personal income, credit history and, from the fourth property, the performance of everything you already own.

To see how rent, rate and deposit interact before you approach a lender, run the numbers through the buy-to-let mortgage calculator. Our guide to how buy-to-let mortgages work covers the wider criteria.

Do limited companies have a different limit?

No. A limited company faces the same lender caps, usually applied to the company and to its directors together.

Most lenders add properties held through a company to those you hold personally when working out whether you are a portfolio landlord. They also count both towards their exposure limits. The main reason landlords borrow through a company is tax rather than access to more mortgages, which our guide to forming a limited company as a landlordexplains.

How landlords keep borrowing after hitting a lender’s cap

When one lender’s cap is reached, the next mortgage comes from somewhere else:

• Spread borrowing across lenders. Use each one up to its per-borrower limit before moving to the next.

• Choose lenders with no all-lender cap. Some, such as Family Building Society, set no maximum on mortgages you hold elsewhere.

• Move to specialist portfolio lenders. Beyond about ten mortgaged properties, specialist buy-to-let lenders take most cases.

• Use a broker. A buy-to-let mortgage broker knows which lenders’ caps you have already used.

Landlords who grow steadily past five or six properties tend to have one thing in common: they can show any lender a clean, current picture of the portfolio on request. That is the reason August’s software for portfolio landlords keeps rent, expenses and documents separate for every property while showing the portfolio as a whole.

Frequently asked questions

Do properties I own outright count towards lender limits?

Not towards the four-property portfolio threshold, which counts mortgaged buy-to-lets only. Some lenders still count them in their own limits. Santander, for example, caps the total number of let properties at ten, mortgaged or not.

Does remortgaging count as a new buy-to-let mortgage?

Each remortgage is a new application assessed under the lender’s current criteria, so a lender’s caps apply again. Some lenders use different thresholds for like-for-like remortgages. The Mortgage Works applies its full portfolio assessment to remortgages without capital raising only from 11 mortgaged properties or £750,000 of borrowing with it.

Can I have a residential mortgage and buy-to-let mortgages at the same time?

Yes. Your residential mortgage does not count towards buy-to-let caps such as NatWest’s, but lenders include its cost when they check your personal finances.

How do I keep track of several buy-to-let mortgages?

List each loan against its property with the lender, rate, fixed-rate end date and balance, and review it before every new application. Landlords using August can start for free and keep each property’s rent, costs and documents in one account.