The Board may grant a variance without making a finding of undue hardship to a property owner for the purpose of making the property accessible to a person with a disability who is living on the property. Any such variance granted shall be restricted solely to the installation of equipment or the construction of structures necessary for access to or egress from the property by the person with the disability. For the purposes of this subsection, a "disability" has the same meaning as a physical or mental handicap under Title 5 M.R.S.A. § 4553, namely, any disability, infirmity, malformation, disfigurement, congenital defect or mental condition caused by bodily injury, accident, disease, birth defect, environmental conditions or illness, and includes the physical or mental condition of a person that constitutes a substantial disability as determined by a physician or, in the case of mental disability, by a psychiatrist or psychologist, as well as any other health or sensory impairment that requires special education, vocational rehabilitation, or related services.