The estimated useful lives of property, plant and equipment categories are as follows:
CategoryEstimated Useful Life
Land and improvements
Land, unlimited; improvements, 15-25 years
Mineral reservesBased on depletion
Buildings
5 - 39 years
Plants
3 - 20 years
Construction equipment
3 - 10 years
Furniture and fixtures
5 - 10 years
Leasehold improvements
The shorter of 15 years or the remaining lease term
Property, plant and equipment at September 30, 2025 and 2024 consisted of the following (in thousands):
September 30,
20252024
Construction equipment$766,914 $570,044 
Plants413,983 255,214 
Land and improvements202,120 94,182 
Mineral reserves 201,440 69,334 
Buildings54,583 39,838 
Furniture and fixtures10,209 8,616 
Leasehold improvements1,431 1,268 
Total property, plant and equipment, gross1,650,680 1,038,496 
Accumulated depreciation, depletion and amortization(526,370)(426,842)
Construction in progress28,760 18,270 
Total property, plant and equipment, net$1,153,070 $629,924 
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Historical Timeline

Fiscal YearFiled
2025Nov 25, 2025Showing above
2024Nov 25, 2024
2023Nov 29, 2023
2022Nov 22, 2022
2021Nov 29, 2021
2020Dec 11, 2020
2019Dec 13, 2019
2018Dec 14, 2018

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.