Renovating a prewar classic six? Here’s what you need to know

Even in the new gilded age of the glassy, glamorous condo, the prewar classic six apartment remains one the most coveted real estate catches in New York City.  Gracefully designed and solidly built, the classic six is known for its six distinct rooms (a living room, formal dining room, kitchen, two bedrooms and what’s known as a “maid’s” room), ceilings of at least nine-and-a-half feet, hardwood floors, separate public and private living spaces, moldings and cornices, and on some occasions, even a working wood-burning fireplace or turn of the century intercom system. They’re also relatively rare, further adding to their desirability (and cost).

The drawback, if you can afford and find a classic six, is that these apartments often need significant renovations to accommodate a contemporary lifestyle.

“Many people who fall in love with a classic six know they’re in for some work to ensure their new home fits their lifestyle, especially if they are purchasing a classic six in an estate sale condition,” says Anna Karp, co-founder of Bolster. “What New Yorkers often don’t realize are the unique considerations and challenges posed by these historic properties—some obvious, and some not so obvious. It’s crucial to work with architects and contractors who have extensive experience doing this kind of specialized work.”

Below, Bolster architect Michael Fasulo, who specializes in prewar projects, explains what to keep in mind during the renovation process.

Spatial Arrangements

Like many apartments built in the early part of the 20th century, the traditional classic six doesn’t always accommodate the needs of modern living very well.

“They were designed for a different lifestyle, often with a small kitchen space arranged for staff,” says Michael. “Now these are spaces the whole family lives in.”

A classic six typically has a dining room, which may be better deployed as part of an expanded kitchen area. The maid’s quarters, if not needed as a child’s bedroom or guestroom, might be reconfigured as a breakfast nook, home office, laundry room, or mudroom.

“A family with two or three kids has a lot of stuff. It’s things like strollers and hockey sticks, those ubiquitous three-wheeled scooters and likely many pairs of shoes. It can be helpful to have a space to drop things off at the door right by the service elevator,” says Michael.


Photo credit: courtesy of Rodman Paul Architects for Bolster

Photo credit: courtesy of Rodman Paul Architects for Bolster


Navigating the Co-op/Condo Board

Perhaps the most crucial step in any prewar co-op or condo renovation is to submit a preliminary sketch of the proposed work to the building’s board before getting too far into design. Even what may seem like minor changes, such as adding six inches to a bathroom, can be an issue due to “wet over dry” rules (i.e. restrictions around putting a room that uses water above a room that does not).

“If there’s a leak, it impacts everybody,” Michael says. “Somebody downstairs could have a Rothko collection. In New York, you never know!”

The co-op board has almost total control, and reviews (and approves) plans with the overall interest of the building in mind, so it’s best to suggest reasonable changes.

“Imagine the building as a village with no yards,” says Michael. “When you do work, you want to think about what you’d tolerate if your neighbor did it.”  

While it might occur to you to try to get around your board’s policies, you shouldn’t get your hopes up.

“They try to hold everybody to the same standards and are usually reluctant to set new precedents,” says Michael. As an example, Michael points to a renovation where the homeowners wanted to reduce the number of bedrooms, which raised some eyebrows on the board: many were concerned about the residence’s potential change in value going from four bedrooms to two.

"We had the whole board into the apartment. We walked them through everything. Gave them the plans and images of what the apartment was going to look like. We ultimately won over the board by taking those extra steps to show the value of what we were designing and building. Not long after, the renovation was approved," Michael says. 

Extras Required by Your Building

A similarly critical component of any renovation in a prewar co-op or condo is your building’s Alteration Agreement and building requirements.

Track down the most recent version of your building’s Alteration Agreement and make sure you understand exactly what’s required when renovating. It’s crucial to work in tandem with an architect and a contractor when going through the document, as requirements can add expenses to a renovation project—thus impacting your design decisions.

“The alteration agreement is a great guide to the dos and don’ts of renovating in your building,” says Michael. “To ensure the smoothest planning and design process, we ask that homeowners prepare a brief of all relevant documents—the Alteration Agreement being one of them—so we can be familiar before we have the first site visit.”

Extras that you may not have planned on (or budgeted for) include:

  • Mandatory window replacements (with building specified models a ‘normal’ window can cost as much as $4,000 a piece–even more if they are large or need to be fire-rated).

  • New electrical supply risers if you are doing HVAC, as well asreplacement of branch plumbing lines when moving plumbing fixtures.

  • As mentioned previously, when there’s water trouble in one apartment, it can impact other homeowners. Special interior waterproofing requirements are often mandated, as well as moisture-sensing shut-off valves (which can cost as much as $1,800 installed) at washing machines or other wet appliances.

  • Should your renovation require any kind of plumbing work on the building’s main risers, it is not uncommon for a building to mandate the use of pre-certified professional plumbers of your building’s choosing. “They know the building, and the board trusts they’re not going to cause leaks. Naturally, they also charge a lot because they have a captive market,” says Michael.

  • Strict limits on the duration of renovations can have a big impact on the scope of the work you can do, and exceeding those limits is extremely costly. “The fines can escalate the longer you go on,” says Michael. “It might be $100 a day for the first week, then $500 a day the second week.”

  • Noise is also a common issue in co-ops and condos, and so buildings will often require acoustic engineering reports and special sound insulation in walls, floors, and ceilings.

  • Old buildings also house old gas lines. If the gas lines in your apartment can’t pass current pressure testing rules (and many can’t), and if you want to move a gas appliance, you may have to convert to electric.

  • Finally, insurance rates for general liability and workman’s compensation are costly on any New York City renovation project. Individual co-ops and condos determine insurance coverage independently, and the insurance coverage your building requires can be—and typically is—much higher than the legal minimums. In renovation projects, you inherit the insurance costs, which impact the overall budget.

Asbestos removal

If your apartment hasn’t been recently renovated, you should be prepared to find asbestos, at least somewhere. “It’s all over the place,” says Michael. “And if you find it, the job has to stop in that area.” A staple of pre-70s construction, asbestos can often be found in window caulking, floor tiles, plaster, in radiator enclosures, and around heating pipes.

The best way to prepare for asbestos is to do your due diligence before any kind of work starts (including design), so it’s not a surprise.

“The Bolster team has years of experience dealing with gut renovations in prewar apartments where asbestos is a common occurrence. Not only do we know how to deal with it if we discover it, but we usually know how to anticipate its presence in the earliest stages of planning, to help manage the homeowners' expectations,” says Anna. “It’s particularly important that homeowners have a full overview of challenges they’ll face during their renovation—and the solutions available to them. This is a critical consideration with estate purchases, when families are in contract but haven’t fully closed on the property. At Bolster, we simply tell them the truth, so they know what they’re embarking on.”

About Us

Bolster is a data-driven team of experts on a mission to eliminate risk from major home renovations by being radically transparent across everything we do. We hire the industry’s best talent and use a continual improvement process to financially guarantee that your major home renovation is designed and built beautifully, on-time and on-budget. From the first sketch to the final handshake, our homeowners know the cost of every line item and have full visibility into project milestones.