Dönni Solar & Bau provides customized solar solutions for residential and commercial clients. From consultation and planning to the installation of photovoltaic systems, we focus on sustainable energy and top-quality service. Our expertise includes roof renovation, building technology, and energy efficiency solutions. Benefit from eco-friendly solar power and optimize your energy costs. With cutting-edge technology and years of experience, we help you transition to renewable energy.

Frefel Bau in Weingarten, Thurgau is your local expert for flat roof renovation, roof repair, facade construction, and sheet metal work . We provide roof maintenance, waterproofing, and eco-friendly green roofs for residential and commercial clients in Weingarten, Kreuzlingen, Romanshorn, and surrounding areas . Rely on our local expertise and sustainable solutions for durable roofs and facades.