The Prudential Regulation Authority generally defines a portfolio landlord as a borrower with four or more mortgaged buy-to-let properties.
When establishing whether you are a portfolio landlord, a lender may take account of mortgaged rental properties that you own:
- In your sole name
- Jointly with another person
- Through a limited company
- Through another business structure
- Across more than one lender
- In some cases, through a connected business
The precise calculation can vary between lenders. For example, lenders may have different approaches to jointly owned properties, limited company investments, holiday lets, houses in multiple occupation and commercial property.
Unmortgaged properties may still be included when the lender assesses your experience, assets, rental income and overall financial position, even if they do not count towards the formal portfolio-landlord threshold.
If you are unsure whether a lender will treat you as a portfolio landlord, MortgageKey can check its criteria before an application is submitted.





