BLACK CASTLE DEVELOPMENTS LIMITED Company number 05849172 · Monitor this company Active Overview People 3 Financial Control Charges Documents Analysis Location Related Registered office AddressTHE ACCOUNTANCY PRACTICE, 41 High Street, Royston, Hertfordshire, SG8 9AW PostcodeSG8 9AW Companies at this postcode 271 Average house price in SG8 9AW £279,000 (10 sales) Map