John Micallef entered the construction industry under the company name of John Micallef Builders Ltd in 1994 with the launch of a small construction firm capable of handling small projects. However, the company quickly evolved itself and embarked on more modest projects. John Micallef Builders Limited forms part of a group of companies based in Malta. This group is mainly engaged in providing construction services and property development. It also owns and operates two service stations; one in a centrally located part of the island and one in the south part of the island.

John Micallef Builders Limited is the construction arm of the group. Its main activities are to provide construction services, both to third parties and to other group companies. It boasts several large building projects, including the construction of factories, a winery, and several residential blocks. The groups' latest project has been the construction of a state-of-the-art service station in Zejtun. J. Micallef Limited is the owner of the Rabat service station, the Zejtun service station and a boatyard and warehousing situated in Mqabba. Those service stations provide several services, comprising fuelling, car wash and valet services, routine servicing and wheel balancing, sale of tyres and car parts, and also operates a snack bar, as well as a BOV ATM. The company’s mission of being amongst the leading companies in this sector enables it to establish itself and set its own standards in the construction industry.