SIC Code 1521 — General Contractors-Single-Family Houses

4-digit industry in the 1987 Standard Industrial Classification — still requested by banks, insurers, SEC filings and legacy systems.

Code	1521
Title	General Contractors-Single-Family Houses
System	SIC 1987 (final edition — replaced by NAICS in 1997)

The SIC was last revised in 1987 and officially superseded by NAICS in 1997, but it never fully disappeared: the SEC still tags EDGAR filings with SIC codes, and many banks, insurers and legacy databases keep requesting it. That is why converting between the two systems is still routine work.

NAICS equivalents of SIC 1521

From the official U.S. Census concordance (1987 SIC → 2002 NAICS). Where the 2002 code no longer exists in NAICS 2022, the closest current code is shown.

NAICS 2002	Title (2002)	Current 2022 code
236115	New Single-Family Housing Construction (except Operative Builders)	236115 (same code)
236118	Residential Remodelers	236118 (same code)

Other SIC codes in 15xx

• 1522 — General Contractors-Residential Buildings, Other Than Single-Family
• 1531 — Operative Builders
• 1541 — General Contractors-Industrial Buildings and Warehouses
• 1542 — General Contractors-Nonresidential Buildings, Other than Industrial Buildings and Warehouses

Data: 1987 SIC titles (OSHA/Census) and official Census concordance — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.