CASTLE HEATING HERTS LTD Company number 11317892 · Monitor this company Active Overview People 1 Financial Control Documents Analysis Location Related Registered office Address29 Cypress Avenue, Welwyn Garden City, Herts, England, AL7 1HN PostcodeAL7 1HN Companies at this postcode 15 Average house price in AL7 1HN £712,000 (44 sales) Map