What does a new fiberglass entry door cost in Carbon County?

Fiberglass entry door replacement costs $800 to $3,000 in Carbon County, with an average project running $1,500. This includes the door, frame, hardware, and professional installation at local labor rates of $29.58 per hour.

How long does exterior door installation take?

Entry door replacement takes 3 to 5 hours. Sliding patio doors require 5 to 8 hours due to larger frames and track installation. Storm doors are the quickest at 1 to 2 hours for a complete installation.

Are steel or fiberglass doors better for Carbon County's climate?

Both perform well in zone 6B's cold climate (7,498 HDD annually). Fiberglass offers better insulation and won't dent, while steel provides superior security. Either choice beats wood for energy efficiency in this heating-dominated region.

What door features matter most for wildfire risk?

Carbon County's wildfire risk score of 93.32 makes fire-resistant materials important. Choose fiberglass or steel over wood, and avoid doors with extensive decorative glass unless it's tempered. Metal weatherstripping seals gaps that could admit embers.

Will a new door lower my heating bills?

Replacing a drafty door can reduce heating costs by 5% to 10%. At Montana's electricity rate of $0.133 per kWh, a home using 10,000 kWh annually could save $65 to $130 per year with an Energy Star certified door rated for zone 6B.

Should I add a storm door to my new entry door?

Storm doors ($300 to $800 installed) add an insulating air pocket that helps in Carbon County's 7,498 HDD climate. They also protect your primary door from winter weather damage. Skip the storm door only if your new entry door has a high-performance insulated core.

What U-factor should I look for in a new door?

For IECC zone 6B, choose doors with U-factors of 0.30 or lower. Lower U-factors mean better insulation, which matters here where heating degree-days exceed the national median by over 100%. Energy Star labels simplify comparison shopping.

REGIONAL COST GUIDE · Carbon County, MT

How Much Does Exterior Door Replacement Cost in Carbon County, MT?

Exterior door replacement in Carbon County, MT costs $800 to $4,500. Get local pricing for entry doors, patio doors, and storm doors.

Cost range $800 – $3,000

Average $1,500

Updated May 17, 2026

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COST BREAKDOWN

What homeowners in Carbon County actually pay.

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

Entry Door Replacement (Fiberglass)

$800 Avg: $1,500 $3,000

Sliding Patio Door Replacement

$1,500 Avg: $2,800 $4,500

Storm Door Installation

$300 Avg: $500 $800

National avg $1,500 × 1x local adjustment = $1,500

Why Carbon County prices look like this.

With 7,498 heating degree-days annually and winter weather scoring 67.70 on FEMA's risk index, exterior doors in Carbon County face significant thermal stress. Replacing an aging or poorly insulated door can reduce heat loss and lower energy bills, especially given Montana's residential electricity rate of $0.133 per kWh. Entry door replacement runs $800 to $3,000 for fiberglass models, while sliding patio doors cost $1,500 to $4,500 depending on glass type and frame material. Storm door installation offers a budget-friendly upgrade at $300 to $800. Local home values averaging $379,300 support investments in quality doors that enhance both curb appeal and energy performance.

Labor Costs for Door Installation

Carpenter wages for door installation average $29.58 per hour nationally, and Carbon County labor costs align with this benchmark. A standard entry door replacement requires 3 to 5 hours of labor, putting installation fees between $90 and $150 for straightforward jobs. Sliding patio doors demand more time (5 to 8 hours) due to larger frames, track alignment, and weatherproofing requirements. Storm door installation is quicker, often completed in 1 to 2 hours. Labor accounts for roughly 30% to 40% of total project cost, with the remainder covering materials, hardware, and weatherstripping. Contractors in rural Montana counties may add travel charges for properties outside main service areas.

Weather and Hazard Considerations

Carbon County's wildfire risk scores 93.32 on FEMA's National Risk Index, placing it in the relatively moderate category. Homeowners in fire-prone areas should consider fiberglass or steel doors over wood options, as these materials resist ignition better during ember exposure. Winter weather risk at 67.70 reinforces the need for doors with proper weatherstripping and insulated cores that can withstand temperature swings. Lightning risk (76.78) and inland flooding (72.26) are secondary concerns, though raised thresholds on entry doors help prevent water intrusion during spring snowmelt. Choosing impact-rated glass for sidelights adds protection against hail damage, which scores 46.09 locally.

Climate Zone and Energy Efficiency

Carbon County sits in IECC climate zone 6B, a cold and dry region where heating dominates energy use. Annual heating degree-days reach 7,498, more than double the national median of 3,700 HDD. This means furnaces run significantly harder here, making door insulation a priority. Look for doors with U-factors of 0.30 or lower to minimize heat transfer. Cooling degree-days total just 434 annually, so summer heat gain through doors is a minor concern. The DOE classifies this area within its north HVAC region, where proper air sealing around door frames prevents drafts that force heating systems to work overtime. Fiberglass and insulated steel doors outperform wood in this climate.

Energy Savings and Utility Costs

Montana residents pay $0.133 per kWh for electricity as of February 2026. While doors contribute less to energy loss than windows or insulation, replacing a drafty entry door can trim heating costs by 5% to 10% in a heating-dominated climate like Carbon County's. For a home using 10,000 kWh annually, that translates to potential savings of $65 to $130 per year. Energy Star certified doors meet stricter U-factor and solar heat gain requirements for zone 6B. Pairing a new entry door with a storm door creates an air pocket that adds insulation value. These upgrades complement the county's strong solar potential (4.84 peak sun hours daily) for homeowners considering broader efficiency improvements.

Financing Your Door Replacement

With median home values at $379,300 in Carbon County, exterior door replacement represents a modest investment relative to property value. Current 30-year mortgage rates sit at 6.36% as of May 2026, making home equity lines of credit one financing option for larger projects like multiple door replacements. A $2,800 sliding patio door financed over 5 years at 8% APR would cost roughly $57 per month. Many door manufacturers and home improvement retailers offer 12 to 24 month promotional financing with deferred interest. Property tax records show median annual taxes of $2,080, suggesting local assessments remain manageable. Energy-efficient door upgrades may qualify for federal tax credits or utility rebates in Montana.

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FREQUENTLY ASKED · 07

Questions buyers ask about exterior door replacement in Carbon County.

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

What does a new fiberglass entry door cost in Carbon County?

Fiberglass entry door replacement costs $800 to $3,000 in Carbon County, with an average project running $1,500. This includes the door, frame, hardware, and professional installation at local labor rates of $29.58 per hour.
How long does exterior door installation take?

Entry door replacement takes 3 to 5 hours. Sliding patio doors require 5 to 8 hours due to larger frames and track installation. Storm doors are the quickest at 1 to 2 hours for a complete installation.
Are steel or fiberglass doors better for Carbon County's climate?

Both perform well in zone 6B's cold climate (7,498 HDD annually). Fiberglass offers better insulation and won't dent, while steel provides superior security. Either choice beats wood for energy efficiency in this heating-dominated region.
What door features matter most for wildfire risk?

Carbon County's wildfire risk score of 93.32 makes fire-resistant materials important. Choose fiberglass or steel over wood, and avoid doors with extensive decorative glass unless it's tempered. Metal weatherstripping seals gaps that could admit embers.
Will a new door lower my heating bills?

Replacing a drafty door can reduce heating costs by 5% to 10%. At Montana's electricity rate of $0.133 per kWh, a home using 10,000 kWh annually could save $65 to $130 per year with an Energy Star certified door rated for zone 6B.
Should I add a storm door to my new entry door?

Storm doors ($300 to $800 installed) add an insulating air pocket that helps in Carbon County's 7,498 HDD climate. They also protect your primary door from winter weather damage. Skip the storm door only if your new entry door has a high-performance insulated core.
What U-factor should I look for in a new door?

For IECC zone 6B, choose doors with U-factors of 0.30 or lower. Lower U-factors mean better insulation, which matters here where heating degree-days exceed the national median by over 100%. Energy Star labels simplify comparison shopping.

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.