The lender now offers up to £10,000 on residential, buy to let and product transfer deals, up from a previous limit of £6,000, Mortgage Solutions understands.
The move is in response to broker feedback with the new structure taking effect on October 14.
All new applications from this date will have the new limit applied.
A NatWest spokeswoman said: “We constantly review our proposition to ensure we’re in line with the market.
“We recently implemented an increase to our maximum procuration fee in response to feedback from brokers who had been asking for this for some time.”