How much does a fiberglass entry door replacement cost in King County, WA?

A fiberglass entry door replacement in King County costs between $815 and $3,060, with a typical project averaging $1,530. These figures reflect a 1.02x local adjustment applied to national averages, based on area insulation worker wages of $26.37/hr compared to the national mean of $25.57/hr.

What does a sliding patio door replacement cost in King County?

Sliding patio door replacements in King County range from $1,530 to $4,590, with the average project costing $2,855. The local 1.02x services adjustment is applied to national pricing. Frame material, glass options, and installation complexity all influence where your project falls within this range.

Is a storm door worth installing in King County?

Storm door installation in King County averages $510, ranging from $305 to $815. Given the area's IECC zone 4C marine climate with wet winters and residential electricity at $0.138/kWh, a storm door adds both an insulating and moisture-protective layer to your existing entry at a relatively low cost.

How do King County door replacement costs compare to the national average?

King County door replacement costs run approximately 1.02x the national average, driven by local insulation worker wages of $26.37/hr versus the national mean of $25.57/hr. While the county's median home value of $811,200 is 4.71x the national average, that home-value premium reflects housing market conditions rather than direct installation cost differences.

What weather risks should I consider when choosing an exterior door in King County?

King County has a FEMA National Risk Index score of 99.68 out of 100 (Very High). The most relevant risks for exterior doors include inland flooding at 99.46, winter weather at 94.72, and ice storms at 91.10. Choose doors with strong weatherproofing, water-resistant frames, and quality seals to handle these conditions.

What climate zone is King County in and how does it affect door selection?

King County is in IECC climate zone 4C with a marine (C) moisture regime in the DOE north HVAC region. This means persistent dampness and mild temperatures year-round, making fiberglass and steel doors preferable to wood. Prioritize doors with quality weatherstripping, thermally broken frames, and proper threshold drainage.

Can I finance a door replacement using home equity in King County?

Yes. With the 30-year fixed mortgage rate at 6.38% and King County's median home value at $811,200, many homeowners have substantial equity to borrow against. A fiberglass entry door at $1,530 or storm door at $510 may come from savings, while larger projects like patio doors averaging $2,855 may benefit from a HELOC or home improvement loan. Median property taxes of $6,785/year should be factored into your overall carrying costs.

REGIONAL COST GUIDE · King County, WA

How Much Does Exterior Door Replacement Cost in King County, WA?

Exterior door replacement in King County, WA costs $305–$4,590. Compare fiberglass entry doors, patio doors, and storm doors with local 2026 pricing data.

Cost range $815 – $3,060

Average $1,530

Updated April 12, 2026

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COST BREAKDOWN

What homeowners in King County actually pay.

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

Entry Door Replacement (Fiberglass)

$815 Avg: $1,530 $3,060

Sliding Patio Door Replacement

$1,530 Avg: $2,855 $4,590

Storm Door Installation

$305 Avg: $510 $815

National avg $1,500 × 1.02x local adjustment = $1,530

Why King County prices look like this.

Replacing an exterior door in King County, WA typically costs between $305 and $4,590 depending on door type and materials. A standard fiberglass entry door replacement averages $1,530, while sliding patio door replacements run higher at roughly $2,855. Storm door installations are the most affordable option, averaging $510. King County's median home value of $811,200 is 4.71x the national average, placing it in a very high cost tier. This elevated housing market means homeowners tend to invest in higher-quality doors that complement property values. With 86 ZIP codes across the county, pricing can shift based on neighborhood accessibility and local permitting requirements. The cost figures above reflect a 1.02x local adjustment applied to national averages, driven primarily by area labor rates in the Seattle-Tacoma-Bellevue metro. Getting at least three quotes from licensed contractors remains the best way to ensure competitive pricing for your specific project.

Labor Costs for Door Installation in King County

Door installation labor in the Seattle-Tacoma-Bellevue metro area is priced close to the national average. According to 2024 BLS Occupational Employment and Wage Statistics, insulation workers (SOC 472131) — the closest standard classification covering weatherproofing and door-sealing trades — earn a mean hourly wage of $26.37/hr and an annual mean wage of $54,850 locally. This compares to a national mean of $25.57/hr, producing the 1.02x services adjustment factor used throughout this guide. The metro area employs approximately 530 workers under this classification. Because local wages only slightly exceed the national figure, King County homeowners see modest labor-driven markups on door projects. A fiberglass entry door replacement averaging $1,530 and a patio door replacement averaging $2,855 both reflect this adjustment. When comparing contractor quotes, ask for an itemized breakdown separating labor from materials so you can verify that labor rates align with prevailing local wages.

Weather and Hazard Risks Affecting Exterior Doors

King County carries an overall FEMA National Risk Index score of 99.68 out of 100, classified as Very High, meaning exterior doors face significant exposure to natural hazards over their lifespan. Inland flooding poses the greatest threat at a score of 99.46 (Very High), which can warp door frames, compromise seals, and cause water intrusion. Winter weather scores 94.72 (Relatively High) and ice storms score 91.10 (Relatively High), both of which stress door weatherstripping and can crack glass inserts through freeze-thaw cycles. Wildfire risk sits at 79.45 (Relatively Low) but remains relevant for properties near forested areas, where fire-rated steel or fiberglass doors may be advisable. Tornado risk (73.16, Relatively Moderate), coastal flooding (71.00, Relatively Moderate), and lightning (74.75, Relatively Moderate) round out the profile. Choosing impact-resistant doors and proper weatherproofing materials helps protect against these combined hazards and extends door longevity.

Climate Zone Considerations for Door Selection

King County falls within IECC climate zone 4C under the 2021 International Energy Conservation Code, with a marine (C) moisture regime and designation in the DOE's north HVAC region. Zone 4C is characterized by mild, wet winters and cool summers — conditions that place a premium on moisture resistance and thermal performance in exterior doors. Fiberglass and steel doors with polyurethane foam cores generally outperform wood in this zone because they resist swelling, warping, and rot caused by persistent dampness. The marine moisture regime means homeowners should prioritize doors with high-quality weatherstripping and multi-point locking systems that compress seals evenly. For sliding patio doors averaging $2,855 locally, look for thermally broken aluminum or vinyl-clad frames designed for high-humidity environments. Proper threshold drainage and flashing details are critical to prevent water pooling — a common failure point in the Pacific Northwest. Selecting doors that meet or exceed zone 4 U-factor requirements ensures both energy efficiency and long-term durability.

Energy Efficiency and Door Performance

Washington State residential electricity costs $0.138 per kWh as of January 2026, which is below the national average, but energy-efficient doors still offer meaningful savings in King County's zone 4C climate. Exterior doors are a common source of air infiltration, and upgrading from a poorly sealed or single-pane door to a modern insulated unit can noticeably reduce heating-related energy loss at that opening. At $0.138/kWh, even modest reductions in energy consumption add up over the typical lifespan of a quality exterior door. Fiberglass entry doors with foam cores, averaging $1,530 locally, typically offer superior insulating value compared to solid wood or basic steel options. For sliding patio doors averaging $2,855, models with low-E glass and argon gas fill deliver the strongest thermal performance. Storm doors at an average of $510 provide an affordable way to add an insulating layer to an existing entry without full replacement. Look for ENERGY STAR-certified products to ensure verified thermal performance.

Financing Your Door Replacement in King County

With the 30-year fixed mortgage rate at 6.38% as of March 26, 2026, many King County homeowners use home equity products to fund exterior door replacements. The county's median home value of $811,200 — roughly 4.71x the national average — means most homeowners have substantial equity available. A fiberglass entry door replacement at $1,530 or a storm door at $510 may be manageable from savings, but a full patio door replacement averaging $2,855 or multiple-door projects could warrant financing. Home equity lines of credit and personal improvement loans are common options. King County homeowners pay a median of $6,785 per year in property taxes, so factor ongoing carrying costs into your budget. Some door upgrades that improve energy efficiency may qualify for utility rebates or federal tax credits, partially offsetting the upfront cost. Compare at least three financing offers and consider whether the improvement's return on resale justifies borrowing at current rates.

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FREQUENTLY ASKED · 07

Questions buyers ask about exterior door replacement in King County.

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

How much does a fiberglass entry door replacement cost in King County, WA?

A fiberglass entry door replacement in King County costs between $815 and $3,060, with a typical project averaging $1,530. These figures reflect a 1.02x local adjustment applied to national averages, based on area insulation worker wages of $26.37/hr compared to the national mean of $25.57/hr.
What does a sliding patio door replacement cost in King County?

Sliding patio door replacements in King County range from $1,530 to $4,590, with the average project costing $2,855. The local 1.02x services adjustment is applied to national pricing. Frame material, glass options, and installation complexity all influence where your project falls within this range.
Is a storm door worth installing in King County?

Storm door installation in King County averages $510, ranging from $305 to $815. Given the area's IECC zone 4C marine climate with wet winters and residential electricity at $0.138/kWh, a storm door adds both an insulating and moisture-protective layer to your existing entry at a relatively low cost.
How do King County door replacement costs compare to the national average?

King County door replacement costs run approximately 1.02x the national average, driven by local insulation worker wages of $26.37/hr versus the national mean of $25.57/hr. While the county's median home value of $811,200 is 4.71x the national average, that home-value premium reflects housing market conditions rather than direct installation cost differences.
What weather risks should I consider when choosing an exterior door in King County?

King County has a FEMA National Risk Index score of 99.68 out of 100 (Very High). The most relevant risks for exterior doors include inland flooding at 99.46, winter weather at 94.72, and ice storms at 91.10. Choose doors with strong weatherproofing, water-resistant frames, and quality seals to handle these conditions.
What climate zone is King County in and how does it affect door selection?

King County is in IECC climate zone 4C with a marine (C) moisture regime in the DOE north HVAC region. This means persistent dampness and mild temperatures year-round, making fiberglass and steel doors preferable to wood. Prioritize doors with quality weatherstripping, thermally broken frames, and proper threshold drainage.
Can I finance a door replacement using home equity in King County?

Yes. With the 30-year fixed mortgage rate at 6.38% and King County's median home value at $811,200, many homeowners have substantial equity to borrow against. A fiberglass entry door at $1,530 or storm door at $510 may come from savings, while larger projects like patio doors averaging $2,855 may benefit from a HELOC or home improvement loan. Median property taxes of $6,785/year should be factored into your overall carrying costs.

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.