Ala. Code § 34-33-3

It shall be unlawful for any individual, partnership, corporation, association, or joint venture to engage in the business of installation, repair, alteration, addition, maintenance, or inspection of a fire protection sprinkler system in this state except in conformity with the provisions of this chapter. Nothing in this chapter, however, shall be construed to apply to fire protection sprinkler system owners who employ registered professional fire protection engineers, and skilled workers who regularly and routinely design, install, repair, alter, add to, maintain, and inspect sprinkler systems on and within the premises of their employer, provided such systems are for the owners’ use only.