The bomb is likely to have come from a local allied firing range
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People living near Cemetery Road in Dereham, Norfolk, were asked to leave their homes on Tuesday while the army disposed of a bomb from World War Two.
No damage was caused by the controlled explosion at about 1030 GMT, but the immediate area was evacuated for safety reasons.
Builders working on a new house in Dereham discovered the bomb on Monday afternoon.
An army bomb disposal team from Colchester in Essex was called in, but they decided to wait for light on Tuesday before detonating the device.
The bomb was not a German shell, but one fired by allied forces, probably at a nearby firing range.
The team packed 25 pounds of high explosive into the shell before detonation.
Last month, Colchester's bomb disposal team were called to 23 incidents, many involving old ordnance being dug up as new developments are built.