Find Phone number, Location Address and all other information of Construction Companies in Karachi Sumsum Builders & Developers Karachi on Branches.pk, Pakistan’s Largest Branches Directory. You can contact them directly on Phone number +92-21-34860802, or you can visit their location in person, address location is: Suite No. 302, 3rd Floor, Plot No. 190, CP & Berar Cooperative Society, Block 7 & 8, PECHS, Karachi..