Build the Best Four Seasons Sunrooms Four Season Sunrooms (Pleasanton Sunrooms) was recently honored by the city of Pleasanton for celebrating 28 years in the business of designing and building beautiful sunrooms. We can bring the outdoors indoors by adding a unique and contemporary sunroom to your home for about the price of a regular addition. There are many styles to choose from: lean-to or cathedral patio rooms, glass patio rooms, sun and shade patio rooms or There are many styles to choose from: lean-to or cathedral patio rooms, glass patio rooms, sun a convertible screen room enclosures. Only the highest quality materials are used. Four Season's patented MC Wonderglass is amazing in its ability to control unwanted solar heat gain and unwanted glare while remaining color neutral. Every glass item manufactured by Four Seasons uses tempered safety glass meeting SGCC as well as German DIN ratings. All Wonderglass comes with a limited lifetime warranty. All of our work is guaranteed in writing.