How This Report Was Built
The Gwinnett County Garage Door Report draws on publicly available government housing data, industry lifespan documentation, and nationally published cost-and-return benchmarks. No data in this report was modeled, extrapolated beyond reasonable analytical bounds, or sourced from unverified secondary claims.
Primary Data Sources
U.S. Census Bureau - ACS Table B25034
All housing stock figures originate from ACS Table B25034, Year Structure Built, for Gwinnett County, using the 2019-2023 five-year estimates. The table documents 340,962 total county housing units distributed across construction-decade cohorts.
Remodeling Magazine / Zonda - 2025 Cost vs. Value Report
Return-on-investment figures, including the 268% garage door replacement ROI, $4,672 national average installed project cost, and $12,526 average resale value added.
Door & Access Systems Manufacturers Association - 2024
The documented 15-to-30-year residential garage door service life range, corroborated by lifespan documentation from Amarr Garage Doors and CHI Overhead Doors.
Manufacturer Lifespan Documentation
Amarr Garage Doors and CHI Overhead Doors documentation used to corroborate residential garage door service life assumptions.
CPSC Federal Register - 1993 Safety Standard
Federal residential garage door opener auto-reverse safety standard context used to identify pre-1993 opener safety evaluation concerns.
Analysis Approach
Garage door age estimates assume original installation at the time of home construction, a standard industry assumption for first-generation suburban housing stock. A conservative 79% garage attachment rate was applied to all pre-2000 housing cohorts, reflecting Gwinnett County's predominantly single-family detached, subdivision-character housing base.
The approximately 153,500 figure for pre-2000 garage doors past documented service life was calculated by applying that 79% rate to the 194,349 ACS-documented homes built before 2000. The broader approximately 218,000 figure incorporates the additional 81,830 homes built between 2000 and 2009 using the same attachment-rate methodology.
The 30-year median door age figure is derived directly from the ACS-documented 1996 median Gwinnett construction year, measured against the 2026 publication date.
Limitations
- The 79% garage attachment figure is a conservative suburban estimate, not a Gwinnett-specific measured rate.
- The analysis assumes original garage doors have not been replaced since construction.
- Cost vs. Value data reflects national averages, and local Gwinnett resale dynamics may produce different outcomes.
- Georgia-specific climate factors affecting door lifespan are referenced qualitatively; no county-level failure-rate data exists to quantify accelerated degradation precisely.
Full Citation List
- U.S. Census Bureau, ACS Table B25034, 2019-2023 Five-Year Estimates
- Remodeling Magazine / Zonda, 2025 Cost vs. Value Report
- Door & Access Systems Manufacturers Association, 2024
- Amarr Garage Doors lifespan documentation
- CHI Overhead Doors industry lifespan data
- CPSC Federal Register, 1993 auto-reverse safety standard