Polyester cabins are modular structures that are produced from glass reinforced polyester. The wall panels and roof panels are produced with special molds. The paint is placed inside the mold, then the glass fibers are placed and the polyester is sprayed. After that the molds are closed and polyurethane foam is injected inside the mold to fill the gap and give excellent insulation to the roof and walls. Wall panels and roof panels are transported to any site and assembled on site to give the final cabin with required size starting from 150x150 cm up to 390x1230 cm.