Maidenhead are currently ninth in the table, with 13 games played so far this season.
Britt joined Saints' academy from Brighton before completing a two-year scholarship with the club.
The shot-stopper had a loan spell at Norwich City during that time, where he helped them win the FA Youth Cup, before signing a new deal at Saints to push on into the Development Squad.
The 19 year-old will link up with Maidenhead ahead of their game against Staines Town on Saturday, kick-off 3pm.