Alex Glass Construction supplies and installs windows, doors, storefronts, curtain wall, glass railings, shower enclosures and mirrors across Manhattan: landmark townhouse windows on the Upper East Side, steel windows on a Lenox Hill penthouse, a ground-floor curtain wall in Turtle Bay, restaurant storefronts in Chelsea and the East Village, backlit mirrors in SoHo lofts.
In short: Alex Glass Construction is a glazing contractor for Manhattan: landmark window replacement in wood, clad-wood, steel and slim aluminum; co-op and condo window packages to the building standard; storefronts, ground-floor curtain wall and entrances for restaurants, retail and lobbies; glass stair and terrace railings; frameless showers, backlit and custom mirrors; office partitions. We survey, quote per opening, prepare Landmarks, DOB and board filings, and install with our own crews, with the sidewalk shed or scaffold arranged where the facade needs it. Sixteen Manhattan projects are in the portfolio. Call 929-235-1233 or request a free quote.
Most Manhattan work starts with the facade and who controls it. On the Upper East Side, the Upper West Side and in the Village the townhouse is landmarked and the Landmarks Preservation Commission reviews every street-facing window: 165 East 64th Street is a rebuilt limestone townhouse with a complete Cortizo package; East 71st Street carries Marvin Ultimate wood double-hungs on the street rooms and oversized in-swing door walls at the rear; the penthouse at 205 East 69th Street has custom thermally broken steel windows with brass hardware; the Upper West Side landmark replacement shows the filing from survey to installation.
Below 34th Street the work is commercial and interior: a new ground-floor curtain wall and entrances at 300 East 50th Street, a restaurant storefront modification on West 23rd Street, thermal bifold doors on an East Village restaurant patio, LED backlit mirrors in a SoHo loft, a Starphire glass stair railing in a Yorkville penthouse and frameless office partitions. Uptown, 2535 Frederick Douglass Boulevard in Harlem is a complete Everest facade package and 99 Claremont Avenue carries Everest divided-lite windows on a Morningside Heights front.
Upper Manhattan: Upper East Side, Lenox Hill, Carnegie Hill, Yorkville, Upper West Side, Morningside Heights, Harlem, Hamilton Heights, Washington Heights, Inwood.
Midtown: Turtle Bay, Murray Hill, Midtown East, Midtown West, Hell's Kitchen, Chelsea, Gramercy, Flatiron, Kips Bay.
Downtown: Greenwich Village, West Village, East Village, SoHo, NoHo, Tribeca, Hudson Square, Lower East Side, Financial District, Battery Park City.
A large share of Manhattan’s townhouses and pre-war apartment houses are in historic districts or individually landmarked. A street-facing window there is a Landmarks Preservation Commission permit; a rear window usually is not, which is why so many of our Manhattan projects carry a traditional window on the street and large aluminum glass at the back. We check the designation, propose a system the Commission accepts for the block, and prepare the elevations, sections, profiles and photographs; see Upper East Side townhouse windows and landmark replacement with aluminum.
Co-ops and condos add the board: a window standard, an alteration agreement, insurance and a schedule; we prepare the package and work to the building’s hours. Storefronts, curtain wall and any opening change file through the Department of Buildings with the architect of record, and sidewalk sheds, scaffolds and the Department of Transportation permits that go with them are arranged by us. Local Law 97 now sets the window U-factor on larger buildings and the quote carries the numbers.
Each of these pages goes deeper on one product or one kind of client in the area:
More projects are added to the portfolio as they finish.
We supply and install windows, doors, storefronts, curtain wall, glass railings, shower enclosures, mirrors and facade panels in Manhattan, for homeowners, co-op and condo boards, property managers, general contractors and developers. We survey, quote per opening, prepare drawings and filings, fabricate aluminum at our Staten Island shop, and install with our own crews. Call 929-235-1233.
It depends on the number and size of openings, the material and line (uPVC, aluminum, clad-wood, steel), the glass, and the installation conditions: scaffolding, a landmark filing or a co-op package all add. We quote per opening with everything named, and the survey and quote are free.
Yes. We check the designation, prepare the Landmarks filing with elevations, sections and profiles, assemble the co-op or condo alteration package, and supply shop drawings and test data for DOB filings through the architect of record. Sidewalk sheds and scaffolds are arranged by us.
Stocked and fabricated lines run three to twelve weeks from the approved drawings; imported European systems and factory-direct container orders three to four months. Installation on a house or an apartment runs one to a few days; a whole building is scheduled floor by floor.
Yes. About half of our work in Manhattan is under a general contractor or directly for a developer: take-off from the drawings, shop drawings, supply or supply-and-install. See glazing contractor for new construction for the area.
Yes, by appointment at 7 Beach Street, St. George, Staten Island, Monday to Friday 8 to 5 and weekends subject to availability, with window, door, railing, glass and mirror samples; we also bring samples to the site.
Yes. The penthouse at 205 East 69th Street has custom thermally broken steel windows with brass hardware, and we supply and install steel for townhouses, lofts and landmark replacements; see the steel windows page.
Yes: 128 West 23rd Street in Chelsea, 107 1st Avenue in the East Village and 300 East 50th Street in Turtle Bay are storefront and entrance work, from a modification to a new ground-floor curtain wall.
Curtain wall in Manhattan Window replacement in Manhattan Storefronts in Manhattan Frameless shower doors in Manhattan Upper East Side Townhouses Marvin in Manhattan Pella in Manhattan Steel Windows Storefront Doors Brooklyn 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 photos of the openings, the building address and what you want to change, or the architect’s drawings. We will survey, quote per opening and tell you what approvals apply.
