Since 1990, WeberHaus has been building only low-energy houses and in 1996 developed the first zero-heating house, where solar plants produce hot water and electricity. In 2000, the first passive house followed with direct heating and heat recovery and in 2006 the plus energy house, which gains more energy than it needs. Every WeberHaus today is equipped with an ecological building shell. The wood fiber insulation board protects the house from external influences such as cold, heat and noise.