GREEN SLAB LIMITED Company number 15113444 · Monitor this company Active Overview People 1 Financial Control Documents Analysis Location Related Registered office AddressUnit 11 Garden Court, Tewin Road, Welwyn Garden City, Hertfordshire, AL7 1BH PostcodeAL7 1BH Companies at this postcode 107 Average house price in AL7 1BH £245,000 (4 sales) Map