Hangzhou Singer Building Material Co., Ltd, located in Hangzhou, China, is one of the leading manufacturers producing asphalt shingles, metal shingles, pvc gutter system and aluminum gutter system.

Our San-gobuild (or SGB) branded products have the ISO9001 and SGS certifications and are exported to many countries in Africa, Asia, Europe and America. They are becoming more and more popular both in China and overseas.

We export directly to many countries. To make sure high quality with low price, we choose best materials, have strict control of packing and shipment. And we give customers personal advice for cost reduction such as exchange rate, custom tax and so on. Please feel free to contact us.