They say they were promised “luxury living,” only to have their dreams shattered after buying pricey condos at a new high-rise complex on the Williamsburg waterfront.

Apartment owners at Northside Piers claim developer Toll Brothers engaged in shoddy construction and, potentially, fraud, before collecting cash for units that run from $512,000 for studios to $2.8 million for penthouses.

But the biggest issue is the project’s signature feature — massive windows, many of which afford spectacular Manhattan views.

Windows are thin and the seams between the panes allow wind and rain to easily enter, residents say.

A Toll Brothers spokesman said the company “is aware of these isolated situations and strongly disagrees with the allegations.”