Licensed in Nassau & Suffolk
Three-season, four-season, patio enclosures, and screen rooms. 580+ projects across Nassau and Suffolk County since 2011.
“Best investment we made in this house.”
Jennifer M. · Massapequa
4.9 Stars
203 Google Reviews
Licensed & Insured
Nassau & Suffolk
NFRC Certified
Sunspace Dealer
580+ Projects
Since 2011
Projects Completed
Years in Business
Google Rating
Person Crew
What We Build
From screened-in porches to climate-controlled four-season rooms, we install the right sunroom for your home, your yard, and your budget.
Recent Work
Every project we complete. Nassau and Suffolk County — from screen rooms in Babylon to four-season additions in Garden City.
Built a 14×18 four-season sunroom off the back of a Garden City colonial — insulated Low-E glass, thermally broken aluminum frame, HVAC tie-in, and a coffered ceiling to match the interior.
12×14 three-season sunroom over an existing deck — double-pane glass, operable windows on three walls, cathedral ceiling, and a ceiling fan for cross-breeze.
Aluminum-framed 10×16 screen room with a solid insulated roof, screened on three walls, and a cedar-clad knee wall. Finished in four working days.
Enclosed an existing 12×20 concrete patio with sliding glass panels and a studio roof — no foundation work needed. Added a ceiling fan and recessed lighting.
Premium glass enclosure with floor-to-ceiling insulated panels, bronze thermally broken frames, and a polycarbonate roof. Overlooks the harbor.
Replaced a failing 2008-era sunroom with a properly engineered 16×18 four-season room — triple-pane glass, R-30 roof insulation, and split-system mini-split for year-round use.
14×16 three-season room with double-pane tempered glass, operable sliders, and a vaulted ceiling with skylights. Integrated into the existing roofline.
12×14 screen enclosure with a shed roof, pet-resistant screen, and a separate entry door. Replaced an old canvas awning that had failed.
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 glass, 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 glass on all three walls with a cathedral ceiling and exterior covered porch overhang.
High-end glass enclosure with frameless corner panels, Low-E insulated glass, and integrated smart climate control. Seamless transition from the kitchen.
Why Long Island Sunroom Co.
Every project we take is a sunroom. We don't do kitchens, bathrooms, or roofs. That focus shows in our work.
No subcontractors. Our 14-person team handles every phase. You know who's on your property.
Nassau License #H3421100000 and Suffolk License #62445-H. We handle the permits, the inspections, and the paperwork.
Your estimate is your price. We quote material and labor line by line so there are no surprises at the end.
What Our Clients Say
Real check-ins from Nassau & Suffolk County homeowners across 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
“Got quotes from four companies. Long Island Sunroom Co. was the only one who actually came out, measured, and explained what would work for our ranch. No pressure. Fair price.”
Robert K.
Huntington, Suffolk County
“Our screen room is perfect for dinner outside without the mosquitoes. The crew was respectful, cleaned up every day, and finished ahead of schedule.”
Patricia L.
Smithtown, Suffolk County
“We had a three-season room built last spring. By October we were still using it comfortably. The glass quality and insulation are impressive for the price point.”
David W.
Garden City, Nassau County
“Second time using LI Sunroom Co. First was a screen room in 2019, now a four-season addition. Same quality, same crew. They know what they are doing.”
Michael R.
Babylon, Suffolk 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
“The patio enclosure turned our unused concrete slab into the most popular room in the house. Cathedral ceiling, sliding glass panels, and a ceiling fan. We practically live in it from March through November.”
Anthony C.
Islip, Suffolk 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
“The whole process was painless. Tom handles the permits, the HOA paperwork, everything. We just picked the glass and the layout. Done in 16 days.”
James D.
Brookhaven, Suffolk County
“We went with the insulated glass upgrade and radiant floor heating. In December, the sunroom is warmer than our living room. Worth every penny.”
Linda F.
Huntington, Suffolk 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
“Called on a Thursday, Tom was at our house Saturday morning. Estimate was ready by Monday. No other contractor moved that fast. Screen room was done in four days.”
Diane R.
Commack, Suffolk 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
“We needed a sunroom that could handle our two golden retrievers. Tom recommended a three-season with composite flooring and heavy-duty screen panels. Holding up great after two years.”
Christine A.
East Northport, Suffolk 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
“The glass enclosure is the nicest room in our house. Floor-to-ceiling windows, bronze frames, views of the backyard from every angle. Worth the investment.”
Nancy E.
Cold Spring Harbor, Suffolk 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
“Two neighbors on our street had sunrooms built by Tom's crew. That's how we found him. All three look different but the quality is the same. Clean work.”
Barbara J.
West Islip, Suffolk 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
“The building department in our town is notoriously slow. Tom's team handled the entire permit process and got approval in five weeks. Would have taken me months.”
Sandra M.
Setauket, Suffolk 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
“Screen room was our best summer purchase. The kids eat dinner out there every night from May through September. No bugs, no pollen, and the breeze comes right through.”
Angela T.
Lindenhurst, Suffolk County
Free Estimate
Tell us about your home and what you're looking for. We'll get back to you within one business day with a ballpark range and next steps.
Free estimates for Nassau & Suffolk County homeowners. No pressure, no obligation.