More than 170 wide-ranging improvement works will be undertaken across a number of sites for security and maintenance work.
The extra money was announced by the Chancellor in this year's Budget.
Justice Minister, Lucy Frazer said: "We want to provide the best experience possible for the victims, witnesses, staff and legal professionals who use our courts every day.
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"That is why this extra funding is so welcome – and why we've worked with the judiciary to make sure we spend it where it is needed most."
Around £4 million will be spent advancing the preparation of capital maintenance projects including replacing the roofs at Snaresbrook Crown Court - the first phase of a longer-term refurbishment programme at the court – and Winchester Crown Court. Other improvements will include new boilers at Newton Abbot, Peterlee and Plymouth Magistrates' Courts, new windows at Barnstaple Magistrates' Court and replacement lifts at Swansea Civil Justice Centre and Thames Magistrates' Court.
A further £3m will be spent on security related work including installing improved locks and panic alarms, vision panels in doors and improving CCTV in waiting areas where necessary.
The remaining £8m will be spent on facilities management works with a particular focus on improving heating and cooling in court buildings.
