Section 220 of RA 7160

SEC. 220. Valuation of Real Property. - In cases where (a) real property is declared and listed for taxation purposes for the first time; (b) there is an ongoing general revision of property classification and assessment; or (c) a request is made by the person in whose name the property is declared, the provincial, city or municipal assessor or his duly authorized deputy shall, in accordance with the provisions of this Chapter, make a classification, appraisal and assessment of the real property listed and described in the declaration irrespective of any previous assessment or taxpayer's valuation thereon: Provided, however, That the assessment of real property shall not be increased oftener than once every three (3) years except in case of new improvements substantially increasing the value of said property or of any change in its actual use.