Reflecting recent economic reports, prices for materials used in door and window manufacturing are showing the first signs of tipping after a steady climb during the COVID-19 pandemic, though those same numbers are still quite high on a year-over-year basis, according to the latest Producer Price Index (PPI) from the U.S. Bureau of Labor Statistics (BLS).

In August, the monthly PPI for flat glass in the commodity category showed the first drop, a decline of 0.3% from July though it still was a full 7.1% over the previous year. According to BLS, the commodity classification “organizes products and services by similarity or material composition, regardless of the industry classification of the producing establishment.”

The index for flat glass manufacturing in the industry classification also dropped ever so slightly, down 0.4% from July 2021, but remaining up 12.3% on a year-over-year basis. The industry classification measures “changes in prices received for the industry’s output sold outside the industry (that is, its net output).”

The PPI for metal windows increased in both comparisons: 0.4% in one month, and by 12.2% compared to the August 2020 report. Prices for metal doors and frames also increased from July to August, improving 6.1%, and growing 22.0% since last year. After a steady two months without change, the price of wood window units increased 0.3% and remained up on a year-over-year basis, clocking in at 6.5% higher than in August 2020. Wood doors for interior and exterior applications continued the trend of increasing prices, up 0.9% over July 2021 and 10.9% over August 2020.

The price for thermoplastic resins and plastic materials continued the trend of increasing prices, with month-over-month coming in at 2.4% over July 2021, and continuing with its eye-popping year-over-year increase of 61.9% compared to August 2020. Prices for fiberglass plastic products dropped 0.2% from July to August but was up 10.1% over the same time last year.

The cost of builders’ hardware, which includes hardware used in doors and windows, increased 1.6% from July to August, and rose by 11.7% from August 2020.

Monthly and Yearly Change in Door and Window Material Prices


July to August 2021

August 2020 to August 2021

Flat Glass



Flat Glass Manufacturing



Metal Windows



Metal Doors and Frames



Wood Window Units



Wood Doors



Thermoplastic Resins and Plastic Materials



Fiberglass Plastic Products



Builders’ Hardware



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