How Much Does a Sunroom Cost on Long Island?

Sunroom costs on Long Island vary widely based on the type of room, its size, and the materials specified. Here is a summary of installed costs for each sunroom type, based on our experience building 580+ projects across Nassau and Suffolk Counties since 2011:

| Sunroom Type | Cost Range (Installed) | Typical Size |

|---|---|---|

| Screen room | $8,000-$18,000 | 120-320 sq ft |

| Three-season sunroom | $18,000-$38,000 | 120-320 sq ft |

| Patio enclosure | $15,000-$45,000 | 100-300 sq ft |

| Four-season sunroom | $35,000-$72,000 | 150-400 sq ft |

| Sunroom addition (new build) | $25,000-$75,000+ | 150-400 sq ft |

These ranges include foundation, framing, windows, roofing, electrical, and basic interior finish. HVAC, premium window upgrades, and interior finish upgrades are additional.

Breaking costs down per square foot helps compare sunroom projects to other types of home additions:

• Screen rooms: $65-$90 per sq ft
• Three-season sunrooms: $130-$180 per sq ft
• Patio enclosures: $120-$175 per sq ft
• Four-season sunrooms: $185-$260 per sq ft

For context, a conventional room addition on Long Island (standard construction with drywall walls, no windows) typically costs $200-$350 per sq ft. A four-season sunroom at $185-$260 per sq ft delivers comparable living space with significantly more natural light, often at a lower per-square-foot cost than traditional construction.

Understanding what drives cost helps you make informed decisions about where to invest and where to save.

Size is the most straightforward cost driver. A 10x12 room (120 sq ft) costs less than a 16x20 room (320 sq ft) in every category. However, cost does not scale linearly -- a room that is twice as large does not cost exactly twice as much, because fixed costs (mobilization, connection to the house) are the same regardless of size.

Typical sizes on Long Island:

• Small: 100-150 sq ft (10x10 to 10x15) -- suits reading nooks, breakfast rooms
• Medium: 150-250 sq ft (12x14 to 14x18) -- the most popular range, suits multi-use rooms
• Large: 250-400 sq ft (16x16 to 16x24) -- suits primary living spaces, entertaining

• Building on an existing concrete patio or reinforced deck: $0-$3,000 for evaluation and modifications
• New concrete slab with frost-depth footings: $3,000-$8,000
• Pier foundation for sloped sites: $4,000-$10,000

Foundation cost varies with soil conditions. Sandy South Shore soil may need wider footings. Rocky North Shore soil may need excavation adjustments.

• Single-pane tempered: lowest cost
• Double-pane non-insulated: adds $1,500-$3,500 over single-pane for a mid-size room
• Double-pane Low-E insulated with argon: adds $3,000-$6,000 over single-pane
• Triple-pane Low-E insulated: adds $5,000-$10,000 over single-pane
• Impact-rated laminated: adds $2,000-$4,000 over standard for the same configuration

For a detailed window comparison, see our guide on the best sunroom materials for Long Island.

• Studio (single slope): included in base pricing
• Gable: adds $2,000-$5,000
• Cathedral: adds $3,000-$7,000
• Skylight roof (full or partial): adds $8,000-$25,000

• No HVAC (three-season rooms): $0
• Ductless mini-split (heating and cooling): $3,000-$5,500
• Ductwork extension from existing system: $1,500-$3,500
• Radiant floor heating: $2,500-$5,000

• Basic (2-4 outlets, overhead light, ceiling fan): $800-$1,500
• Standard (recessed lighting, multiple circuits, smart controls): $1,500-$3,000
• Full (including dedicated panel, outdoor lighting, USB outlets): $3,000-$5,000

• Minimal (exposed frame interior, concrete floor): included in base pricing
• Standard (painted drywall ceiling, vinyl or laminate flooring, basic trim): $2,000-$4,000
• Premium (tongue-and-groove ceiling, hardwood or tile flooring, detailed trim): $4,000-$8,000

Long Island sunroom costs run 15-25 percent above national averages. This premium is consistent across all construction types and reflects several factors specific to the LI market:

Labor rates: Construction labor on Long Island is among the highest in the country. Union and prevailing wage rates, combined with the high cost of living, push labor costs significantly above national benchmarks. Skilled window and framing installers on LI earn 20-35 percent more than their counterparts in most other markets.

Material transport: Building materials delivered to Long Island must cross bridges or travel through congested metro-area routes. Freight surcharges for LI delivery are standard from most suppliers.

Material specifications: Long Island's coastal environment requires salt-air-resistant materials that cost more than standard residential specifications. Powder-coated aluminum, stainless steel hardware, and marine-grade finishes are not optional here -- they are necessary for longevity.

Insurance and licensing: New York State licensing requirements, mandatory workers' compensation insurance, and general liability coverage add to contractor overhead, which is reflected in project pricing.

These factors are not unique to sunrooms -- they affect all construction on Long Island. A homeowner in Smithtown or Massapequa should expect to pay more than a homeowner in suburban Connecticut or New Jersey for the same project.

If your budget is firm, here are the decisions that have the most impact on total cost:

Start with a three-season room and upgrade later: A three-season sunroom can be converted to a four-season room by replacing window panels with insulated units and adding HVAC. This is more expensive than building four-season from the start, but it spreads the investment over time.

Build on an existing structure: Converting an existing patio or deck saves $3,000-$8,000 in foundation costs compared to a new sunroom addition.

Choose standard windows: Single-pane tempered windows are a common specification for three-season rooms and cost significantly less than insulated units. Upgrade later if you convert to four-season.

Keep the roof simple: A studio (single-slope) roof is the most affordable option and works well with ranch and contemporary homes. Gable and cathedral roofs add cost primarily through additional framing labor and materials.

Right-size the room: A well-designed 12x16 room (192 sq ft) is more useful than an oversized 16x20 room (320 sq ft) that you did not need. We help you determine the right size during the design consultation.

Online cost calculators and national average data can give you a general idea, but accurate pricing for a Long Island sunroom requires a site visit. The condition of your existing structure, your soil type, and your home's architecture all affect the final number.

Long Island Sunroom Co. provides detailed, line-item estimates after an in-person site evaluation. Our estimates include:

• All materials with specific product names and specifications
• Labor broken out by trade (framing, windows, electrical, roofing)
• A project timeline with milestone dates
• Payment schedule tied to completion milestones

There is no charge for the site visit or the estimate, and no deposit is required to receive a written proposal. Call (631) 565-8313 to schedule, or request an estimate online.

We offer financing options that make sunroom projects accessible at a range of budgets. Typical terms include 12-60 month payment plans with competitive rates. Many homeowners also use home equity lines of credit (HELOCs), which may offer tax-deductible interest on home improvement projects. Consult your tax advisor for details specific to your situation.

For any questions about pricing or to schedule a free site visit, call (631) 565-8313.