According to The Mail on Sunday, the number of mortgage advisers will double from 400 to 800 this year.
The report said almost 20% of the banks customers are clients of NatWest or RBS and the bank has a 12% share of new mortgage approvals.
And RBS was keen to point out that new rules that limit LTI will not create an issue for the lender.
Moray McDonald, head of personal and business banking products at RBS, said: “This will not affect our appetite to grow and the 15% cap is very unlikely to check our growth.”