How much does a basic screen porch enclosure cost in Nassau County?

Screen porch enclosures for a 200 square foot space typically cost $4,600 to $13,800 in Nassau County, with an average around $8,280. This reflects the local 0.92x cost adjustment based on carpenter wages of $25.59 per hour in the Jacksonville metro area.

What is the price difference between 3-season and 4-season sunrooms?

A 3-season sunroom averages $20,240 locally (range $13,800 to $32,200), while a 4-season sunroom averages $34,960 (range $23,000 to $50,600). The $14,720 average difference covers insulation, HVAC integration, and upgraded glazing needed for year-round use in Nassau County's 2,758 cooling degree-day climate.

Do I need hurricane-rated windows for a sunroom in Nassau County?

Yes. Nassau County's hurricane risk score of 88.36 (Relatively Moderate on FEMA's scale) means Florida building codes require impact-resistant glazing or approved storm shutters for new construction. Coastal flood risk at 75.80 may also trigger elevation requirements depending on your property's location.

How much will a sunroom add to my electric bill?

With Florida electricity at $0.158 per kWh and Nassau County's high cooling demand (2,758 CDD annually), a poorly insulated 4-season sunroom can add $50-100 monthly in summer. Proper low-E glass and R-13+ wall insulation significantly reduce this impact.

What climate zone is Nassau County in for building codes?

Nassau County is in IECC Climate Zone 2A (hot-humid), part of the DOE Southeast HVAC region. With only 1,472 heating degree-days but 2,758 cooling degree-days annually, building codes focus on cooling efficiency rather than heating performance.

Can I finance a sunroom through my mortgage?

Yes. With current mortgage rates at 6.36% and Nassau County median home values at $351,100, home equity financing is common. A $35,000 sunroom financed at 6.36% over 15 years equals roughly $305 monthly. Compare HELOC rates against contractor financing offers.

Why are sunroom costs lower in Nassau County than the national average?

Local carpenter wages of $25.59 per hour fall below the national average of $29.58, creating a 0.92x cost adjustment. While labor is less expensive, hurricane-resistant materials and code compliance requirements may offset some savings compared to lower-risk regions.

REGIONAL COST GUIDE · Nassau County, FL

How Much Does a Sunroom or Enclosure Cost in Nassau County, FL?

Sunrooms in Nassau County, FL cost $8,280 to $50,600. See 3-season, 4-season, and screen porch pricing with local labor rates.

Cost range $4,600 – $13,800

Average $8,280

Updated May 18, 2026

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COST BREAKDOWN

What homeowners in Nassau County actually pay.

Local market ranges built from regional labor, materials, and permitting data — not national averages.

Screen Porch Enclosure (200 sq ft)

$4,600 Avg: $8,280 $13,800

3-Season Sunroom (200 sq ft)

$13,800 Avg: $20,240 $32,200

4-Season Sunroom (200 sq ft)

$23,000 Avg: $34,960 $50,600

National avg $9,000 × 0.92x local adjustment = $8,280

Why Nassau County prices look like this.

Hurricane wind ratings of 88.36 on FEMA's risk index make Nassau County one of Northeast Florida's more demanding markets for sunroom construction. Local carpenters earn $25.59 per hour (Jacksonville metro average), which translates to project costs roughly 8% below national figures. A basic screen porch enclosure runs $4,600 to $13,800, while fully insulated 4-season sunrooms reach $23,000 to $50,600 for a 200 square foot addition. With median home values at $351,100 in Nassau County, a well-built sunroom can add both living space and resale appeal. The cooling-dominated climate here (2,758 cooling degree-days annually) makes glass selection and ventilation planning especially relevant for year-round comfort.

Labor Costs and Contractor Availability

The Jacksonville metro area employs approximately 2,500 carpenters at a mean hourly wage of $25.59, or $53,230 annually. This rate falls below the national carpenter average of $29.58 per hour, contributing to Nassau County's 0.92x cost adjustment factor. Labor typically represents 40-50% of total sunroom project costs, with the remainder going toward materials like aluminum framing, glass panels, roofing, and HVAC integration for 4-season rooms. Permit fees and engineering requirements (particularly wind load calculations) add to the labor hours required. Expect contractors to factor in additional time for hurricane-resistant fastening systems and impact-rated glass installation, both standard practice in this coastal region.

Storm and Hazard Considerations

Nassau County's FEMA National Risk Index score of 59.32 reflects several elevated hazards that directly affect sunroom construction. Hurricane risk scores 88.36 (Relatively Moderate), requiring impact-resistant glazing or approved shutter systems for new construction. Coastal flood risk at 75.80 means elevation requirements may apply in certain areas, particularly near the Amelia Island coastline. Lightning risk registers at 71.47, making proper grounding and surge protection advisable for any electrical work in the enclosure. Inland flooding (59.00) and tornado risk (53.63) remain relatively low but still warrant attention to roof anchoring and drainage planning. Building codes in Florida reflect these realities, so budget for compliance costs that might not apply in lower-risk regions.

Climate Zone and Seasonal Demands

Nassau County sits in IECC Climate Zone 2A, a hot-humid classification within the DOE's Southeast HVAC region. With only 1,472 heating degree-days annually (60% below the national median of 3,700 HDD), winter heating concerns are minimal. Cooling dominates the picture at 2,758 cooling degree-days, placing significant demands on any enclosed living space. For 3-season sunrooms, operable windows and ceiling fans may suffice from October through April. Four-season rooms require dedicated HVAC capacity, low-E glass coatings, and proper insulation to manage summer heat gain. The high annual precipitation (typical for Northeast Florida) also demands careful roof pitch design and gutter integration to prevent water intrusion at the home-sunroom junction.

Energy Costs and Efficiency

Florida residential electricity rates averaged $0.158 per kWh as of February 2026, making cooling costs a real consideration for sunroom owners. An uninsulated or poorly glazed 4-season sunroom can add $50-100 monthly to summer electric bills in this climate. Low-E coated glass, reflective roofing materials, and adequate insulation (R-13 walls minimum for Zone 2A compliance) help control these costs. Nassau County receives strong solar exposure at 5.31 peak sun hours daily, meaning west-facing sunrooms will experience intense afternoon heat without proper shading or glazing choices. Some homeowners pair sunroom additions with solar panel installations (a 6kW system produces roughly 8,471 kWh annually here) to offset the additional load.

Financing Your Sunroom Project

At current mortgage rates of 6.36% (as of May 14, 2026), many Nassau County homeowners finance sunroom additions through home equity products or cash-out refinancing. With median home values at $351,100 and median property taxes of $2,558 annually, equity positions are generally favorable for renovation lending. A $35,000 4-season sunroom financed over 15 years at 6.36% would carry monthly payments around $305. Some contractors offer promotional financing, though rates often exceed HELOC alternatives. The 2.04x cost multiplier relative to national housing prices (based on local home values) suggests that quality improvements hold value well in this market. Always compare total interest costs across financing options before committing.

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FREQUENTLY ASKED · 07

Questions buyers ask about sunrooms and enclosures in Nassau County.

Short answers to the most common things we hear about local pricing, scope, and timing.

How much does a basic screen porch enclosure cost in Nassau County?

Screen porch enclosures for a 200 square foot space typically cost $4,600 to $13,800 in Nassau County, with an average around $8,280. This reflects the local 0.92x cost adjustment based on carpenter wages of $25.59 per hour in the Jacksonville metro area.
What is the price difference between 3-season and 4-season sunrooms?

A 3-season sunroom averages $20,240 locally (range $13,800 to $32,200), while a 4-season sunroom averages $34,960 (range $23,000 to $50,600). The $14,720 average difference covers insulation, HVAC integration, and upgraded glazing needed for year-round use in Nassau County's 2,758 cooling degree-day climate.
Do I need hurricane-rated windows for a sunroom in Nassau County?

Yes. Nassau County's hurricane risk score of 88.36 (Relatively Moderate on FEMA's scale) means Florida building codes require impact-resistant glazing or approved storm shutters for new construction. Coastal flood risk at 75.80 may also trigger elevation requirements depending on your property's location.
How much will a sunroom add to my electric bill?

With Florida electricity at $0.158 per kWh and Nassau County's high cooling demand (2,758 CDD annually), a poorly insulated 4-season sunroom can add $50-100 monthly in summer. Proper low-E glass and R-13+ wall insulation significantly reduce this impact.
What climate zone is Nassau County in for building codes?

Nassau County is in IECC Climate Zone 2A (hot-humid), part of the DOE Southeast HVAC region. With only 1,472 heating degree-days but 2,758 cooling degree-days annually, building codes focus on cooling efficiency rather than heating performance.
Can I finance a sunroom through my mortgage?

Yes. With current mortgage rates at 6.36% and Nassau County median home values at $351,100, home equity financing is common. A $35,000 sunroom financed at 6.36% over 15 years equals roughly $305 monthly. Compare HELOC rates against contractor financing offers.
Why are sunroom costs lower in Nassau County than the national average?

Local carpenter wages of $25.59 per hour fall below the national average of $29.58, creating a 0.92x cost adjustment. While labor is less expensive, hurricane-resistant materials and code compliance requirements may offset some savings compared to lower-risk regions.

SOURCES · 08

How these numbers were built.

Cost estimates are derived from government data including the U.S. Census Bureau (ACS), Bureau of Labor Statistics (OEWS), FEMA National Risk Index, EIA energy data, IECC climate zone classifications, Federal Reserve (FRED), and HUD Fair Market Rents.