Persimmon has been ordered to make changes to 262 homes in Colchester after it was revealed that they had been built the “wrong way round”.
It has emerged that construction teams working on the scheme built an entire block of one, two, and three-bedroom homes with the windows, doors and balconies installed backwards.
The housebuilder must now reverse these fittings to comply with planning permission.
Martin Goss, a Colchester councillor, said the “major cock-up” was “mystifying”.
“It just beggars belief,” he said. “How on earth can a developer build a set of flats the wrong way?”
A spokesman for Persimmon Homes said that some alterations had already been made to the homes in Colchester.
He added: “We have made some limited alterations to the position of some windows during the early stages of construction, in line with our planning consent.”