The first major Liverpool project, which will cost £490,000, begins this week with a refurbishment of the Weld Blundell in Lydiate.
The refurbishment at the pub will transform what the company describes as a “tired, dated building” into an “outstanding pub”, serving fresh home-cooked food for the first time in many years.
The pub is on track to open in early October after a 15-month closure, creating 15 new jobs.
The announcement follows on from a pledge by Heineken earlier this year to invest £3.6m on refurbishing 16 Star sites in Lancashire as part of the same programme.
Star Pubs & Bars managing director Lawson Mountstevens said the £20m would be spread across 100 to 125 projects, with a particular focus on rural and suburban pubs.
As well as investing in its Star pubs, the pubco is also selling off a selection as part of its Punch deal.
Within the list of 30 pubs Heineken has offered to sell across the UK to “reduce competition”, five are in the north-east, eight in Scotland and one in Guildford, Surrey.