How much does it cost to combine apartments in New York City?

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In this apartment combination of a prewar condo off Central Park West, Bolster architect David Yum merged two living rooms to create an inviting central living space. David Yum Architects - Bolster

In this apartment combination of a prewar condo off Central Park West, Bolster architect David Yum merged two living rooms to create an inviting central living space.
David Yum Architects - Bolster

Technically and legally, combining co-op or condo apartments usually just requires removing a kitchen and creating a doorway-sized opening in a wall to join the two units. 

“You could get that done for around $5,000 to $10,000,” says Fraser Patterson, a former general contractor and the founder of Bolster, which matches homeowners to reliable contractors and architects, vastly simplifies the bidding process, and financially guarantees that each project is completed satisfactorily. “But to create something that will be worth more than the sum of its parts on resale and actually feels like a home in terms of flow, functionality and durability, most people undertake pretty extensive renovations.”

For example, one Bolster client on the Upper West Side is spending $860,000, or about $436 per square foot, to combine three adjacent co-op apartments (two one-bedroom apartments and a studio) into a 1,970-square-foot four-bedroom. 

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