R&M Williams Building Group based in Cardiff and Swansea comprises of R & M Williams Ltd, JT Merchant Ltd, and R&M Williams D ... evelopments; the Group structure supports a combined turnover of £50million. In the 50 years that R&M Williams Building Group has been established, we have gained a reputation for high standards of workmanship in the Construction and Building maintenance industry. We currently employ over 500 operatives across our business, and pride ourselves in delivering services to local people through local labour in conjunction with our continued commitment to apprenticeships and Work based training. read more