Sunroom Installation Services
Long Island Sunroom Co. is a licensed sunroom contractor serving Nassau County and Suffolk County since 2007. We design and install five types of sunrooms and outdoor living spaces — from a simple screen porch to a full glass conservatory.
Every project is fully permitted through your local building department, inspected by the county, and backed by a structural warranty. Our crew handles the entire process from initial measurement to final walkthrough.
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Tell us which room type you're considering.
Which room is right for you?
| Type | Cost | Season | Best for |
|---|---|---|---|
| Four-Season | $35,000 – $85,000 | Year-round | Homeowners wanting a true addition — an extra living room, d… |
| Three-Season | $18,000 – $40,000 | Spring–Fall | Families who entertain outdoors spring through fall and want… |
| Patio Enclosure | $12,000 – $28,000 | Spring–Fall | Homeowners with an existing patio or covered deck who want q… |
| Screen Room | $8,000 – $22,000 | Spring–Fall | Budget-conscious homeowners who primarily want bug protectio… |
| Glass Room | $55,000 – $130,000 | Year-round | Luxury homeowners wanting a true conservatory or glass exten… |
Why Long Island homeowners choose us for sunroom installation
Choosing a sunroom contractor on Long Island means navigating permit requirements that differ between Nassau County and Suffolk County municipalities. We handle both. Since 2007, we have installed over 1,800 sunrooms across the island — from Manhasset and Great Neck on the North Shore to Merrick and Massapequa on the South Shore, and throughout Suffolk County towns like Huntington, Commack, Smithtown, and Ronkonkoma.
Every project starts with an in-home estimate where we measure your space, check property setbacks, and review your home's existing structure. We then provide an itemized quote — not a phone estimate — so you know exactly what the job costs before committing.
Sunroom installation across Nassau and Suffolk County
We install all five sunroom types in every Nassau County and Suffolk County town. Our crew is based on Long Island and familiar with local building codes, zoning setback requirements, and the permitting process for each municipality. Whether your home is in a historic district in Great Neck or a newer development in Ronkonkoma, we know what the building department expects.
Popular areas for sunroom installation include the South Shore communities of Massapequa, Merrick, and Oceanside, the North Shore towns of Manhasset, Cold Spring Harbor, and Syosset, and central Suffolk communities like Nesconset, Commack, and Huntington.
Sunroom Installation FAQ
We install five types: four-season sunrooms (fully insulated, HVAC-connected year-round rooms), three-season rooms (spring-through-fall screened or glass-paneled rooms), patio enclosures (convert an existing patio into enclosed space), screen rooms (aluminum-framed screened porches), and glass room additions (premium conservatory-style extensions). Every type is available for homes in both Nassau and Suffolk County.
The main difference is winter usability. A four-season sunroom has insulated walls, thermal glass, and connects to your home's HVAC — you can use it in January. A three-season room is not insulated and works beautifully from March through November on Long Island. If you only plan to use the room during warmer months, a three-season room saves $15,000–$40,000.
Yes. We hold active home improvement contractor licenses in both Nassau County and Suffolk County. Every sunroom project includes full permit applications, inspections, and code compliance. We've been licensed and installing sunrooms across Long Island since 2007.
Costs vary by type and size. Screen rooms start around $8,000. Patio enclosures run $12,000–$28,000. Three-season rooms cost $18,000–$40,000. Four-season sunrooms range from $35,000–$85,000. Glass room additions start at $55,000. We provide free, itemized in-home estimates with no obligation.
Yes — permit handling is included in every project. We prepare the architectural drawings, submit the application to Nassau or Suffolk County's building department, and manage the process through approval. Permit timelines run 3–8 weeks depending on the municipality.
In many cases, yes. A patio enclosure converts an existing concrete slab into enclosed living space — it's our fastest and most affordable option. If your deck is structurally sound and meets code, we can often build on the existing framework. We assess the foundation during the free in-home estimate.
Ready to add a sunroom to your Long Island home?
Free estimate, no obligation. We typically schedule consultations within 2 weeks.
174+ 5-star reviews · Licensed in Nassau & Suffolk · 1800+ rooms installed