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

A 4-season sunroom averages $38,000 compared to $22,000 for a 3-season room (both at 200 sq ft). The $16,000 premium covers insulation, climate-controlled HVAC integration, and high-performance glazing required for year-round use in this 7,498 HDD climate.

How do Stillwater County sunroom costs compare to the national average?

Local costs align closely with national averages due to the 1x services adjustment factor. Carpenter wages here match the national mean of $29.58 per hour, so you will not pay a labor premium despite the rural location.

Is a 4-season sunroom worth it in Montana's cold climate?

For Stillwater County's heating-dominated climate (7,498 HDD annually, more than double the 3,700 national median), a 4-season room provides 12 months of use versus roughly 5 months for a 3-season design. The higher upfront cost often pays back through extended utility.

What should I budget for a screen porch enclosure?

Screen porch enclosures in Stillwater County run $5,000 to $15,000, with a typical project costing around $9,000 for 200 square feet. This option works well for summer use but offers no protection during the long heating season.

How much will heating a sunroom add to my energy bills?

At Montana's $0.133/kWh electricity rate, a poorly insulated sunroom can add $400-$600 annually. High-performance glazing, R-30+ insulation, and a cold-climate mini-split can reduce this by 40-60%.

Do I need special glass for wildfire risk in this area?

Stillwater County's wildfire risk scores 87.05 (Relatively Low), the highest local hazard. Properties near grassland or forest edges should consider tempered glass and fire-resistant framing, though this is not mandatory countywide.

Can I install solar panels on my sunroom roof?

Yes. Stillwater County receives 4.70 peak sun hours daily, and a 6kW system produces about 8,017 kWh annually (15.3% capacity factor). A south-facing sunroom roof offers ideal mounting while providing interior shade during summer months.

REGIONAL COST GUIDE · Stillwater County, MT

How Much Does a Sunroom Cost in Stillwater County, MT?

Sunroom installation in Stillwater County costs $5,000-$55,000. Get local pricing for 3-season, 4-season, and screen porch enclosures.

Cost range $15,000 – $35,000

Average $22,000

Updated May 17, 2026

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COST BREAKDOWN

What homeowners in Stillwater County actually pay.

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

3-Season Sunroom (200 sq ft)

$15,000 Avg: $22,000 $35,000

4-Season Sunroom (200 sq ft)

$25,000 Avg: $38,000 $55,000

Screen Porch Enclosure (200 sq ft)

$5,000 Avg: $9,000 $15,000

National avg $22,000 × 1x local adjustment = $22,000

Why Stillwater County prices look like this.

Stillwater County stands apart from its Montana neighbors with median home values reaching $355,600 (roughly 2.06x the national average), making substantial additions like sunrooms a natural fit for properties here. Adding a sunroom in this non-metro county runs $5,000 to $55,000 depending on the type you choose. A basic screen porch enclosure averages around $9,000, while a fully insulated 4-season room pushes toward $38,000 or higher. With annual heating degree-days hitting 7,498 (more than double the 3,700 national median), choosing between a 3-season and 4-season design is not just about comfort. It directly affects your long-term energy bills. Most Stillwater County homeowners find the 4-season option worth the premium given the extended cold season.

Labor Costs and Contractor Availability

Carpenter wages in this region align with the national average of $29.58 per hour ($61,533 annually). Because Stillwater County is rural and non-metro, you may find fewer specialized sunroom contractors compared to Billings or Bozeman. This can affect scheduling and lead times, though it does not necessarily inflate prices. Labor accounts for roughly 40-50% of a sunroom project, meaning a $38,000 four-season room includes approximately $15,000-$19,000 in labor costs. Getting quotes from multiple contractors is wise since travel time from larger metros may be factored into bids. Request detailed breakdowns separating materials, labor, and permits before signing any contract.

Weather Risks and Building Considerations

Stillwater County carries a 16.76 overall risk score (Very Low) according to FEMA's National Risk Index, which is favorable for sunroom longevity. However, wildfire risk scores 87.05 (Relatively Low), the highest hazard category here. If your property borders grassland or forested areas, consider fire-resistant framing and tempered glass. Winter weather scores 51.53 (Relatively Low), and with 3.7 inches of annual snowfall, snow load on sunroom roofs is minimal compared to mountainous Montana counties. Inland flood risk at 36.23 suggests standard drainage planning is sufficient. Hail (28.66) and tornado (6.62) risks are Very Low, so impact-resistant glazing is optional rather than essential for most properties.

Climate Zone Requirements for Sunrooms

Stillwater County falls in IECC Climate Zone 6B (DOE North HVAC region), a cold, dry classification that shapes every sunroom decision. With 7,498 heating degree-days annually, local homes run heating systems roughly 103% more than the national median of 3,700 HDD. The 434 cooling degree-days (very low) mean summer AC is barely a factor. For a 4-season sunroom, this heating-dominated climate demands R-30 or higher roof insulation, double or triple-pane low-E glass, and thermal break aluminum frames. A 3-season room works for May through September use, but expect it to be unusable roughly seven months per year. Proper southern exposure can offset some heating load through passive solar gain.

Energy Costs and Efficiency Planning

Montana electricity runs $0.133 per kWh as of February 2026, slightly below the national average. Heating a poorly insulated 200 sq ft sunroom through a Stillwater County winter could add $400-$600 annually to your bills. High-performance glazing and insulation cut this significantly. The county receives 4.70 peak sun hours daily, and a 6kW solar array produces about 8,017 kWh per year (15.3% capacity factor). If you install solar panels, a south-facing sunroom roof provides excellent mounting space while shading interior living areas in summer. Pairing a 4-season sunroom with a mini-split heat pump rated for cold climates offers efficient zone heating without overworking your main HVAC system.

Financing Your Sunroom Project

With mortgage rates at 6.36% as of May 2026, many Stillwater County homeowners tap home equity for sunroom projects. On the median home value of $355,600, a HELOC or home equity loan can cover even premium 4-season installations. Property taxes average $2,131 annually here, and a quality sunroom addition may increase assessed value by 50-70% of project cost. For a $38,000 four-season room, expect potential value gains of $19,000-$26,600. Cash-out refinancing makes less sense at current rates if your existing mortgage sits below 5%. Personal loans or contractor financing offer alternatives, though interest rates run higher (typically 8-15%). Always compare total interest paid across options before committing.

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FREQUENTLY ASKED · 07

Questions buyers ask about sunrooms and enclosures in Stillwater County.

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

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

A 4-season sunroom averages $38,000 compared to $22,000 for a 3-season room (both at 200 sq ft). The $16,000 premium covers insulation, climate-controlled HVAC integration, and high-performance glazing required for year-round use in this 7,498 HDD climate.
How do Stillwater County sunroom costs compare to the national average?

Local costs align closely with national averages due to the 1x services adjustment factor. Carpenter wages here match the national mean of $29.58 per hour, so you will not pay a labor premium despite the rural location.
Is a 4-season sunroom worth it in Montana's cold climate?

For Stillwater County's heating-dominated climate (7,498 HDD annually, more than double the 3,700 national median), a 4-season room provides 12 months of use versus roughly 5 months for a 3-season design. The higher upfront cost often pays back through extended utility.
What should I budget for a screen porch enclosure?

Screen porch enclosures in Stillwater County run $5,000 to $15,000, with a typical project costing around $9,000 for 200 square feet. This option works well for summer use but offers no protection during the long heating season.
How much will heating a sunroom add to my energy bills?

At Montana's $0.133/kWh electricity rate, a poorly insulated sunroom can add $400-$600 annually. High-performance glazing, R-30+ insulation, and a cold-climate mini-split can reduce this by 40-60%.
Do I need special glass for wildfire risk in this area?

Stillwater County's wildfire risk scores 87.05 (Relatively Low), the highest local hazard. Properties near grassland or forest edges should consider tempered glass and fire-resistant framing, though this is not mandatory countywide.
Can I install solar panels on my sunroom roof?

Yes. Stillwater County receives 4.70 peak sun hours daily, and a 6kW system produces about 8,017 kWh annually (15.3% capacity factor). A south-facing sunroom roof offers ideal mounting while providing interior shade during summer months.

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.