The choice of concrete and ready made fiberglass is not easy. Both options have advantages and disadvantages that we need to be aware of. Concrete swimming pools are massive and built-in, extremely heavy structures, which together with the water in the swimming pool, in most cases, are nearly 100 tons, whose settling is unpredictable. A crack in a 1 cm in time, almost irreparable consequences can be caused to the watertight walls and bottom of the swimming pool. The concrete swimming pools are lined entirely with glass ceramic tiles, which are joined together. Chemicals take part of the joint over time and the tiles inevitably begin to fall at a certain point, requiring repairs, and after a certain point these activities are already regular. The construction activities in them take about a month – 30 days. Ultimately, these swimming pools are about 20% more expensive than all other swimming pools. Concrete swimming pools, however, have no limitations in shapes, dimensions and depths. The repairs are relatively simple and rough construction works and can be carried out by builders with experience in such work. Reinforced fiberglass swimming pool bases with several layers of polyester resins and special fabric are delivered ready to site with a special transport and cranes are unloaded in the trench. Installation activities are about 2-3 days. The construction works also last so long. About 20% more profitable than concrete, save time and all rough construction work. There are no tiles and joints, which facilitates maintenance and cleaning. However, they have limitations in shapes, sizes and depths. They still have to be transported to their place and unloaded with a crane for which there must be a physical possibility. But they are still very suitable for family houses and small hotels. The repair, if required, is specific and should only be carried out by a narrowly specialized worker. Fiberglass is the same material as the modern yachts.