Nassau County
Licensed, experienced, and familiar with every Nassau County building department -- from Garden City to Glen Cove.
Licensed, insured, local. No pushy sales calls.
Nassau County is one of the most densely developed residential counties in New York State, with approximately 1.4 million residents across 56 square miles of incorporated villages, cities, and unincorporated areas. The housing stock is predominantly single-family homes built between 1920 and 1980, with colonials, capes, ranches, and split-levels making up the vast majority.
These homes are well-suited for sunroom additions. Many sit on lots of 6,000-10,000 square feet with rear yards that face south or southwest -- ideal orientation for a sunroom. Property values in Nassau County average above $600,000, and adding a sunroom delivers measurable returns at resale. See our analysis of how sunrooms increase home value on Long Island.
Long Island Sunroom Co. holds Nassau County Home Improvement Contractor License #H3421100000. We have completed projects in communities throughout the county.
We build sunrooms in every Nassau County community. Here are some of the areas where we work most frequently:
[Garden City](/areas/nassau-county/garden-city/) -- One of Long Island's most sought-after villages, with a mix of Tudor, colonial, and arts-and-crafts homes. We design sunrooms that integrate with these distinctive architectural styles.
[Great Neck](/areas/nassau-county/great-neck/) -- A peninsula community on the North Shore with waterfront and water-view properties. Great Neck homes benefit from sunrooms oriented toward Little Neck Bay and Long Island Sound.
[Manhasset](/areas/nassau-county/manhasset/) -- Affluent North Shore community with large lots and established homes. Manhasset's mix of pre-war estates and mid-century colonials presents varied design opportunities for sunroom additions.
[Massapequa](/areas/nassau-county/massapequa/) -- South Shore community with family-friendly neighborhoods and active outdoor living culture. Massapequa's typical ranch and split-level homes are straightforward sunroom candidates with generous rear yards.
We also serve Mineola, Hempstead, Freeport, Levittown, Hicksville, Syosset, Jericho, Plainview, Old Bethpage, Oyster Bay, Glen Cove, Long Beach, Rockville Centre, Valley Stream, Floral Park, New Hyde Park, Westbury, Merrick, Bellmore, and Wantagh.
Recent Work
Every sunroom we've built in Nassau County — town, size, and type.
Built a 14×18 four-season sunroom off the back of a Garden City colonial — insulated Low-E windows, thermally broken aluminum frame, HVAC tie-in, and a coffered ceiling to match the interior.
Enclosed an existing 12×20 concrete patio with sliding window panels and a studio roof — no foundation work needed. Added a ceiling fan and recessed lighting.
Replaced a failing 2008-era sunroom with a properly engineered 16×18 four-season room — triple-pane windows, R-30 roof insulation, and split-system mini-split for year-round use.
Enclosed a 10×18 deck with a three-season patio enclosure — vinyl panels, aluminum frame, and a cathedral ceiling that tied into the gable end of the house.
Added a 14×20 year-round sunroom off the kitchen with radiant floor heat, insulated windows, and a heated slab foundation. Functions as a second dining area in winter.
12×16 three-season sunroom on a new concrete pier foundation. Double-pane windows on all three walls with a cathedral ceiling and exterior covered porch overhang.
High-end 14×16 four-season sunroom with Low-E insulated windows wrapping three walls and integrated smart climate control. Seamless transition from the kitchen.
12×18 three-season sunroom with a coffered ceiling to match the interior trim, custom casement windows, and a French door leading to the patio.
Enclosed a 12×16 paver patio with a three-season patio enclosure — aluminum frame, single-pane windows, and vented polycarbonate roof panels for summer heat management.
Premium 14×18 four-season sunroom with thermally broken bronze frames, Low-E argon-filled insulated windows, and a vaulted ceiling. Doubles as a dining room.
12×14 three-season room replacing an old screened porch. Double-pane windows, operable awning sashes, and a cathedral ceiling with a T&G pine interior.
Compact 12×14 year-round sunroom tied into the ranch's existing HVAC. Insulated windows, tray ceiling, and LVP flooring for continuity with the adjacent den.
Homeowner Reviews
Real reviews from real Nassau County neighbors — every sunroom type we build.
“Tom and his crew built our four-season sunroom in under three weeks. We use it every single day, even in January. Best investment we made in this house.”
Jennifer M.
Massapequa, Nassau County
“We had a three-season room built last spring. By October we were still using it comfortably. The window quality and insulation are impressive for the price point.”
David W.
Garden City, Nassau County
“Tom gave us an honest assessment — told us our deck wasn't suitable for a full four-season room and recommended a three-season instead. Saved us $20k and we love the result.”
Susan T.
Great Neck, Nassau County
“Had a leaking sunroom installed by another company five years ago. Tom's team ripped it down, fixed the foundation issues, and built a proper four-season room. Night and day difference.”
Karen B.
Manhasset, Nassau County
“Replaced an old screened porch with a proper three-season sunroom. The difference in build quality is obvious. Solid framing, clean welds, no rattling when the wind picks up.”
Thomas H.
Merrick, Nassau County
“We live on a corner lot in Levittown and thought we didn't have room for a sunroom. Tom found a way to make it work with a 12x14 footprint off the kitchen. Perfect fit.”
Maria G.
Levittown, Nassau County
“Our colonial had zero outdoor living space. The four-season room added 280 square feet that blends right into the house. Guests don't realize it's an addition.”
Steven P.
Syosset, Nassau County
“The crew showed up at 7:30 every morning and cleaned up before they left. Not a single cigarette butt in my yard. Professional from start to finish.”
William S.
Rockville Centre, Nassau County
“Had our patio enclosure built right before Thanksgiving. We hosted 18 people in it for dinner. Everyone asked who built it. Happily gave out Tom's number.”
Frank V.
Farmingdale, Nassau County
“Our split-level had an awkward back deck that nobody used. Tom converted it into a three-season room that opens off the den. Feels like it was always part of the house.”
George L.
Plainview, Nassau County
“We compared fiberglass, vinyl, and aluminum frames. Tom walked us through each option honestly and explained why aluminum lasts longer near the coast. Appreciated that transparency.”
Richard D.
Long Beach, Nassau County
“We added radiant floor heating to our four-season room. In February, I sit in there with a cup of coffee watching snow fall on the backyard. Best room in the house.”
Paul N.
Oceanside, Nassau County
Free estimates for Nassau & Suffolk County homeowners. No pressure, no obligation.