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REGIONAL COST GUIDE · St Louis County, MO

How Much Does Exterior Door Replacement Cost in St. Louis County, MO?

Exterior door replacement in St. Louis County, MO costs $525–$4,725 on average. Compare local pricing for entry, patio, and storm doors.

Cost range $840 – $3,150
Average $1,575
Updated July 9, 2026
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COST BREAKDOWN

What homeowners in St Louis County actually pay.

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

Entry Door Replacement (Fiberglass)

$840 Avg: $1,575 $3,150

Sliding Patio Door Replacement

$1,575 Avg: $2,940 $4,725

Storm Door Installation

$315 Avg: $525 $840

National avg $1,500 × 1.05x local adjustment = $1,575. Range: $800 × 1.05 = $840 to $3,000 × 1.05 = $3,150.

REGIONAL COST SNAPSHOT

The St Louis County numbers, card by card.

Local cost, labor, and climate-risk data for St Louis County, MO — the same cards we publish to social, built from federal datasets.

Exterior Door Replacement in St Louis County, MO — regional cost snapshotExterior Door Replacement in St Louis County, MO — typical local cost rangeExterior Door Replacement in St Louis County, MO — local labor market dataExterior Door Replacement in St Louis County, MO — climate and hazard risk factors St Louis County, MO Enter the local Exterior Door Replacement marketplace. Get Free Quotes

Why St Louis County prices look like this.

St. Louis County homeowners considering exterior door replacement should budget between $315 and $4,725 depending on the door type and project scope. Local costs run approximately 1.05x the national average, driven by area labor rates that sit above the national benchmark. The county's median home value is $260,700 with median property taxes of $3,193 per year, placing it in a high cost tier at 1.51x the national home-value average. A new exterior door is one of the most impactful upgrades for curb appeal, energy efficiency, and security. Entry-level storm door installations start around $315, while a standard fiberglass entry door replacement averages $1,575 installed. Sliding patio door replacements represent the higher end, averaging $2,940. Getting multiple quotes from licensed contractors in the St. Louis metro area is the best way to ensure competitive pricing for your specific project.

Labor Costs for Door Installation in St. Louis County

Installation labor is a significant portion of exterior door replacement costs in the St. Louis metro area. According to 2024 Bureau of Labor Statistics data, specialty installation workers in the St. Louis, MO-IL metro earn an average hourly wage of $27.49/hr, translating to an annual mean wage of $57,180. This is above the national average of $25.57/hr, contributing to the 1.05x local cost adjustment. The metro area employs approximately 540 workers in this trade category. Labor typically accounts for a substantial share of a door replacement project, with the remainder going to materials. More complex installations—such as widening a door frame for a patio door or reinforcing structural headers—will push labor hours and total costs higher. A straightforward entry door swap in an existing frame requires fewer hours than a full patio door retrofit, so always request an itemized quote that separates labor from materials.

Weather and Hazard Risks Affecting Exterior Doors

St. Louis County faces significant natural hazard exposure that directly impacts exterior door durability and material selection. The county's overall FEMA National Risk Index score is 99.33 out of 100 (Relatively High). Hail risk is rated 99.75 (Very High), meaning impact-resistant door materials and sidelights are a smart investment. Tornado risk scores 98.06 (Relatively High), making reinforced entry doors and code-compliant installations essential for safety. Winter weather (98.35, Very High) and ice storms (98.83, Very High) subject doors to freeze-thaw cycling, so proper weatherstripping and insulated cores help prevent warping and seal failure. Lightning risk is also elevated at 99.30 (Very High). Inland flood risk registers at 99.08 (Relatively High), which may warrant water-resistant thresholds and raised sills in flood-prone areas. Fiberglass and steel outperform wood in severe-weather durability and are the recommended materials for this county.

Climate Zone Considerations for Door Selection

St. Louis County falls within IECC Climate Zone 4A (Mixed-Humid), classified under the DOE's north HVAC region. Zone 4A experiences hot, humid summers and cold winters, creating significant thermal stress on exterior doors throughout the year. Doors in this climate zone should meet or exceed Energy Star criteria for Zone 4, which emphasizes a balance of insulation value (U-factor) and solar heat gain management. Fiberglass doors with polyurethane foam cores offer strong thermal performance in this mixed climate, resisting both summer heat transfer and winter cold bridging. Proper installation with continuous weatherstripping and an insulated threshold is critical—even a high-performance door will underperform if air infiltration occurs around the frame. For sliding patio doors, look for models with low-E glass and thermal-break frames to minimize energy loss across the large glazed area typical of these units.

Energy Savings from Door Replacement in Missouri

Missouri's residential electricity rate is $0.118 per kWh as of January 2026, which sits below the national average. While electricity rates are moderate, replacing a drafty or poorly insulated exterior door can still produce meaningful savings. An old, single-pane patio door or a warped entry door with degraded weatherstripping allows substantial conditioned air to escape, forcing your HVAC system to work harder in both St. Louis County's hot summers and cold winters. Upgrading to an Energy Star-rated fiberglass entry door or a thermally broken patio door reduces air infiltration significantly. At $0.118/kWh, even a modest reduction in heating and cooling energy use translates to real dollar savings over a door's 20–30 year lifespan. For the greatest energy impact, pair your door replacement with new weatherstripping around the frame and an insulated threshold—these low-cost additions maximize the thermal performance of your new door.

Financing Your Door Replacement Project

With the 30-year fixed mortgage rate at 6.38% as of March 26, 2026, many St. Louis County homeowners are exploring financing options for improvements rather than refinancing existing mortgages. A fiberglass entry door replacement averaging $1,575 could be financed through a personal home improvement loan, a HELOC, or a contractor payment plan. For larger projects like a sliding patio door replacement averaging $2,940, a HELOC may offer lower rates tied to your home's equity—the county median home value of $260,700 provides a solid equity base for many homeowners. Some contractors offer promotional financing for 12–18 months on qualifying projects. Property taxes in St. Louis County average $3,193/year, so factor total carrying costs into your budget when considering a HELOC. For projects under $1,000 like storm door installations averaging $525, paying out of pocket typically makes more financial sense than taking on interest-bearing debt.
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FREQUENTLY ASKED · 07

Questions buyers ask about exterior door replacement in St Louis County.

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

  1. How much does it cost to replace a front door in St. Louis County, MO?

    A fiberglass entry door replacement in St. Louis County costs between $840 and $3,150, with a typical project averaging $1,575. These figures reflect a 1.05x local adjustment applied to national averages, based on area labor rates of $27.49/hr compared to the $25.57/hr national average.

  2. What does a sliding patio door replacement cost in St. Louis County?

    Sliding patio door replacement in St. Louis County ranges from $1,575 to $4,725, with a typical project costing around $2,940. Costs vary based on door size, frame material, glass type, and installation complexity.

  3. How much does storm door installation cost in St. Louis County?

    Storm door installation runs between $315 and $840, with an average cost of $525. This is a relatively affordable upgrade that adds weather protection and an extra layer of insulation to your existing entry door.

  4. Why are exterior door costs slightly higher in St. Louis County than the national average?

    Local specialty installation workers earn an average of $27.49/hr compared to the national average of $25.57/hr. This results in a 1.05x services adjustment factor. The county also sits at 1.51x the national home-value average, reflecting a high cost-of-living tier.

  5. What weather risks should I consider when choosing an exterior door here?

    St. Louis County has a FEMA National Risk Index score of 99.33 out of 100. Hail risk is 99.75 (Very High), ice storm risk is 98.83 (Very High), and winter weather risk is 98.35 (Very High). Impact-resistant fiberglass or steel doors with insulated cores are strongly recommended.

  6. What climate zone is St. Louis County in for door energy ratings?

    St. Louis County is in IECC Climate Zone 4A (Mixed-Humid), within the DOE's north HVAC region. Doors should meet Zone 4 Energy Star requirements for optimal thermal performance in the area's hot summers and cold winters.

  7. What are the current electricity and mortgage rates relevant to this project?

    Missouri's residential electricity rate is $0.118/kWh as of January 2026, and the 30-year fixed mortgage rate is 6.38% as of March 26, 2026. At these rates, energy-efficient door upgrades offer steady long-term savings, while financing costs remain a factor for larger projects like patio door replacements averaging $2,940.

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.

GENERATED · APRIL 13, 2026
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