Analysis
NAICS 54135 is the 2022 NAICS industry for building inspection services, part of 5413 (Architectural, Engineering, and Related Services).
It has only one more detailed code, 541350, which covers exactly the same activities; the definition, index entries and statistics are on that page.
County Business Patterns counts 7,496 US establishments in this code in 2023, employing 28,755 people at an average annual payroll of $60,645 per employee (33rd percentile of national industries). 86% of the establishments have fewer than five employees, which marks it as a small-business industry.
Between 2018 and 2023 the number of establishments grew 9% and employment rose 30%. The 2018 count used NAICS 2017, so part of a large move can come from codes being redefined rather than from businesses opening or closing.
By establishments it ranks 3rd of the 8 codes at this level within Architectural, Engineering, and Related Services, with 6.4% of them.
Official definition
See industry description for 541350.
Source: US Census Bureau, NAICS 2022 Manual.