JAM Builders Jed Brent and Marlon Cosmas have worked together on various projects over the past six years. In 2003 they decided to set up JAM Builders to combine their various skills and resources and provide a complete and professional building service. Jed Brent, Director With over 30 years of building experience in London, Jed lends a wealth of knowledge to JAM Builders. Covering all facets within residential construction, Jed has overseen many major building projects. Marlon Cosmas, Director Qualified in New Zealand as a Carpenter, working on architecturally designed homes, Marlon has over ten years building experience. Since arriving in London in 1999, Marlon has worked on and overseen a variety of residential projects.