We service the entire island of Oahu Hawaii


General contractors, civil engineers, septic systems, septic tanks, cesspool upgrades, leach fields, pump stations, grease traps, grease and sewer pumping


Aiea - Barbers Point NAS - Ewa Beach - Fort Shafter - Haleiwa - Hauula - Hawaii Kai - Honolulu - Kaaawa - Kahalu'u - Kahuku - Kailua - Kaneohe - Kapolei
Kunia - Laie - Mililani - Pearl City - Wahiawa - Waialua - Waianae - Waikiki - Waimanalo - Waipahu


and all surrounding areas!


"Cowper Construction finished my project on time and added some great ideas to improve the excavation design. Pro job and great skill with the equipment. I should have been using Cowper on my other jobs." ~ Kevin M

"Great company and I am happy with their work. Welcome back on my jobs any time!" ~ Kurt Davis

"My cesspool upgrade in Hawaii went down without any hangups. Thank you Mike and Bob!" ~ Aloha Jerry Driscoll