The lender is not regulated by the Prudential Regulation Authority (PRA) and so has chosen not to make any changes to meet the new rules.
It said this commitment would mean no extra work would be required or extra information requested when conducting portfolio business.
This contrasts with other lenders, such as Vida Homeloans, which are also not covered by the PRA but have decided they will meet the regulatory changes.
Significant money to lend
Fleet will be maintaining its key criteria of an income coverage ratio of 125% at 5% stress test.
It added that it was intending to focus on its processing and that it had a “significant amount of money to lend”.
Fleet Mortgages chief executive officer Bob Young said the lender was launched with portfolio and professional landlords in mind.
“That undertaking, and our continued commitment to that client base and their advisers, means that 56% of our total business is now with portfolio landlords so we fully understand their needs and those of the intermediaries who work on their behalf,” he said.
“The PRA underwriting requirements will mean significant changes to many lenders’ systems and process, and an increase in complexity and workload for advisers.
“Our aim however is make sure the opposite is true when it comes to dealing with Fleet Mortgages – we have outlined our key commitments which mean no extra work required or extra information requested,” he added.