(1) Not later than July 1, 2013, insurance companies shall provide a premium discount or insurance rate reduction in an amount and manner as established in subsection (4) of this section and according to Section 83-75-5. In addition, insurance companies may also offer additional adjustments in deductible, other credit rate differentials, or a combination thereof, collectively referred to as adjustments. These adjustments shall be available under the terms specified in this section to any owner who retrofits his or her insurable property in Harrison, Hancock, Jackson, Stone and Pearl River Counties to resist loss due to hurricane or other catastrophic windstorm events.

(2) To obtain the adjustment provided in this section, an insurable property shall be retrofitted to one of the tiered mitigation levels as defined in the Fortified for Safer Homes requirements as may from time to time be adopted by the Institute for Business and Home Safety, or other mitigation program, or other construction technique, or standardized code that is recommended by the Mississippi Windstorm Mitigation Coordination Council and approved by the Commissioner of Insurance. Zone three HUD code manufactured homes installed to specifications and regulations promulgated by the Commissioner of Insurance shall be considered. An insurable property shall be certified as conforming to Fortified for Safer Homes requirements only after evaluation and certification by an Institute for Business and Home Safety certified evaluator. Certification of conformity of an insurable property with the other mitigation program, other construction technique, or other standardized code shall be made only by a building official or other certified or licensed building evaluator.

(3) An owner of insurable property claiming an adjustment under this section shall maintain sufficient certification records and construction records including, but not limited to, a certification of compliance with an approved mitigation program as promulgated by the Mississippi Windstorm Mitigation Coordination Council and approved by the Commissioner of Insurance or valid certification from the Institute for Business and Home Safety for compliance with a program described in subsection (2) of this section.

(4) Insurers required to submit rates and rating plans to the commissioner shall submit actuarially justified rating plans for any person who retrofits an insurable property to comply with the sets of alternatives provided in subsection (2) of this section. The adjustment shall only apply to policies that provide wind coverage and may apply to that portion of the premium for wind coverage or to the total premium if the insurer does not separate out its premium for wind coverage in its rate filing. The adjustment shall apply exclusively to the premium designated for the improved insurable property. In addition to the requirements of this section, an insurer may voluntarily offer any other mitigation adjustment that the insurer deems appropriate.