FMB The Federation of Master Builders (FMB) accreditation is the most distinguished recognition in the construction industry, symbolising superior craftsmanship, integrity, and professionalism. For Lion and Leinster, earning this accreditation is a testament to our dedication to maintaining the highest standards in building and customer service. The FMB only accredits builders who pass a series of rigorous assessments, including thorough vetting of work quality, financial health, and customer satisfaction. This prestigious endorsement not only reflects the expertise and reliability of Lion and Leinster but also provides our clients with the assurance that their projects are in capable and trustworthy hands.