Library Worxby Kloset Worx · libraryworx.com

Journal · October 29, 2026 · 1 min read

Bookcases around a fireplace in a brownstone.

Designing built-in bookcases on both sides of a fireplace in a Brooklyn or Harlem brownstone: alcove depth, base cabinets, mantel lines, clearances and the TV question.

Built-in bookcases on both sides of a marble fireplace in a Park Slope brownstone parlor, design concept
Built-in bookcases on both sides of a marble fireplace in a Park Slope brownstone parlor, design concept

Brownstone parlors in Park Slope, Fort Greene, Harlem and Brooklyn Heights almost always have a fireplace on the long wall, with two alcoves either side of the chimney breast. Those alcoves are made for bookcases.

01Use the alcove depth

The chimney breast usually projects 12 to 20 inches. Bookcases built flush with its face look original to the house; recessed slightly, they let the mantel stand forward.

02Base cabinets plus shelves

A closed base cabinet about 30 to 36 inches high, with shelves above, is the classic layout. The cabinet top can align with the mantel height, so the eye reads one line across the wall.

03Clearances

Keep combustible materials the required distance from the firebox, especially for working fireplaces. Your contractor or the fireplace's specification sets the numbers, and the drawing follows them.

04Respect the trim

Brownstones have deep baseboards, picture rails and plaster cornices. Built-ins that continue the baseboard and stop under the cornice look like they belong.

05Where does the TV go?

Over the mantel is often too high for comfortable viewing. Better options are a side wall, a cabinet with doors in one alcove, or a separate media room. Our sister site explains comfortable TV height.

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Set the size and finish, see it in 3D and as a dimensioned drawing, and send it to the studio for a site measure.