Landmarked brownstones, co-ops with a board standard, houses in south Brooklyn and new buildings in Bushwick and Williamsburg — surveyed, fabricated and installed by one crew, with the Landmarks and co-op paperwork handled.
Brooklyn is four different window jobs. The brownstone and rowhouse belt — Park Slope, Carroll Gardens, Cobble Hill, Fort Greene, Bed-Stuy, Crown Heights — is punched openings in masonry, often inside a historic district where the Landmarks Preservation Commission governs the replacement. The southern belt — Sheepshead Bay, Gravesend, Manhattan Beach, Midwood, Bensonhurst — is detached and semi-detached houses being rebuilt or upgraded, where the owner picks the system. The new-construction belt — Williamsburg, Bushwick, Gowanus, Prospect Lefferts Gardens, Flatbush — is whole-building packages for developers. And the co-op and condo stock everywhere in between has a board, an alteration agreement and a house standard for the window.
We are a fabricator and installer, not a dealer: we survey, draw, make and fit. That is why the same crew handles a landmarked brownstone on Hoyt Street and a nine-unit condo in Bushwick.
| Project | Neighborhood | What was replaced or installed |
|---|---|---|
| 343 Hoyt Street | Carroll Gardens | Pella windows, terrace door and screened slider on a landmarked rowhouse renovation |
| 420 12th Street (Ansonia Court) | Park Slope | Crystal sliding aluminium windows and terrace door in a converted 1881 loft |
| 1192 Gravesend Neck Road | Gravesend | Upper-floor replacement with black Cortizo tilt-and-turns on a mixed-use building |
| Ocean Parkway & Avenue W | Gravesend | Reynaers arched and rectangular windows on a new limestone house |
| Coleridge Street | Manhattan Beach | Pella divided-lite casements and French doors on a new house |
| 2518 Ocean Avenue | Sheepshead Bay | Everest aluminium windows and balcony doors on a condo building |
| 17 Dodworth Street | Bushwick | Everest windows and glass railings on a nine-unit condo |
| 408 Lefferts Avenue | Prospect Lefferts Gardens | Alutech windows and storefront on a new six-storey building |
| 24 Frost Street | Williamsburg | Everest windows and a two-storey curtain wall front |
In a historic district the LPC will generally want the replacement to match the configuration, sightlines and muntin pattern of the original in a material it accepts for that facade; on a brownstone that usually means a double-hung or a divided-lite casement in wood-clad, aluminium with a true divided-lite look, or steel where the original was steel. We survey the existing windows, draw the replacement against them and prepare the submission. Rear elevations outside the street view are treated more freely, which is where many owners put the large tilt-and-turns and sliding doors. Openings in a 130-year-old brownstone are never square, so every unit is made to the surveyed opening.
A Brooklyn co-op window job starts with the alteration agreement and the building’s window standard: the approved manufacturer or performance level, the colour, the configuration, and the insurance and scheduling requirements. We handle the paperwork the board wants — specification, insurance certificates, method statement — and install unit by unit around occupied apartments. Our window replacement guide walks through the process.
Owners rebuilding in Sheepshead Bay, Gravesend, Manhattan Beach and Midwood choose the system: slim black aluminium tilt-and-turns (Reynaers, Cortizo, Alutech), wood-clad (Pella, Marvin), or vinyl where the budget leads. Near the water — Manhattan Beach, Sheepshead Bay, Gerritsen — the specification includes impact and salt-air considerations we detail on the laminated glass page.
For developers we take the window schedule from the architect’s drawings to shop drawings, fabricate, and install to the construction schedule, with storefront, curtain wall, railings and cladding from the same crew where the building needs them. The Bushwick, Williamsburg, Lefferts and Flatbush projects above are that kind of job.
Site survey and photographs; a proposal with the system, glass and finish; measurements of every opening (not a catalogue size); LPC or co-op paperwork where it applies; fabrication, typically four to ten weeks depending on the system; installation with the perimeter flashed and sealed properly — the detail our punched-window page explains, and the one that decides whether a Brooklyn masonry opening leaks. Permits: like-for-like replacement is generally a minor alteration; enlarging an opening is not, and we tell you which you have.
If the building is in a historic district or individually landmarked, yes for the street-facing windows, and in most cases for the rear as well. The LPC wants the replacement to match the original configuration and sightlines; we prepare the submission.
It depends on the system, the number of openings and the building: a vinyl double-hung in a house costs a fraction of a landmark-grade divided-lite casement in a brownstone. We quote from a survey, not a price list, and the quote is free.
Yes. We work within the building’s alteration agreement and window standard, supply the insurance and specification the board requires, and install around an occupied apartment.
Reynaers, Cortizo, Alutech, Everest, Crystal, Aluplast, Pella, Marvin and others; we choose with you based on the building and the budget.
Yes. Alex GC fabricates aluminium systems at our Staten Island shop and installs them; wood-clad and vinyl lines are ordered to our survey and installed by our crews.
All of them. Recent work: Carroll Gardens, Park Slope, Gravesend, Sheepshead Bay, Manhattan Beach, Bushwick, Williamsburg, Prospect Lefferts Gardens, Flatlands, Midwood.
Window Replacement in NYC Landmark Window Replacement Brooklyn Windows, Doors & Glass Tilt-and-Turn Windows Double-Hung Windows Punched Windows Portfolio
About this page. Written by Alex GC Inc. d/b/a Alex Glass Construction and reviewed before publication by Aleksandr Chernovolenko, Managing Partner, with our design and estimating lead and a field foreman. Our foremen hold the NYC DOB Site Safety Training supervisor card and our crews the 40-hour worker card; we are certified to fabricate, install and service Alutech and Everest aluminum systems. Facts are drawn from our own projects, manufacturer test data and the applicable codes; where we are giving an opinion, we say so. Last reviewed September 2026. Credentials
Send the address and a few photographs. We will tell you what the building needs — landmark, co-op or straightforward — and come out to survey.
