J & J CONSTRUCTION (UK) LIMITED Company number 04347513 · Monitor this company Dissolved Overview Documents Analysis Location Related Registered office Address5 SWALLOW COURT, SWALLOWFIELDS, WELWYN GARDEN CITY, HERTS, AL7 1SB, AL7 1SB PostcodeAL7 1SB Companies at this postcode 5 Average house price in AL7 1SB £460,000 (2 sales) Map