Upon the adoption of an ordinance finding that dwelling conditions of the character described in § 31-15-320 exist within the county, the county governing body may adopt ordinances relating to the dwellings within the county which are unfit for human habitation. Such ordinances may include the following provisions:

(1) That a public officer be designated or appointed to exercise the powers prescribed by the ordinances;

(2) That whenever a petition is filed with the public officer by at least five residents of the county charging that any dwelling is unfit for human habitation or whenever it appears to the public officer (on his own motion) that any dwelling is unfit for human habitation, the public officer shall, if his preliminary investigation discloses a basis for such charges, issue and cause to be served upon the owner of and all parties in interest in such dwelling a complaint stating the charges in that respect and containing a notice that a hearing will be held before the public officer or his designated agent at a place therein fixed not less than ten days nor more than thirty days after the serving of such complaint; that the owner and parties in interest shall be given the right to file an answer to the complaint and to appear in person or otherwise and give testimony at the place and time fixed in the complaint; and that the rules of evidence prevailing in courts of law or equity shall not be controlling in hearings before the public officer;

(3) That if, after such notice and hearing, the public officer determines that the dwelling under consideration is unfit for human habitation he shall state in writing his findings of fact in support of such determination and shall issue and cause to be served upon the owner thereof an order

(a) If the repair, alteration, or improvement of the dwelling can be made at a reasonable cost in relation to the value of the dwelling (the ordinance of the county may fix a certain percentage of such cost as being reasonable for such purpose), requiring the owner, within the time specified in the order, to repair, alter or improve such dwelling to render it fit for human habitation or to vacate and close the dwelling as a human habitation or

(b) If the repair, alteration or improvement of the dwelling cannot be made at a reasonable cost in relation to the value of the dwelling (the ordinance of the county may fix a certain percentage of such cost as being reasonable for such purpose), requiring the owner, within the time specified in the order, to remove or demolish such dwelling;

(4) That, if the owner fails to comply with an order to repair, alter or improve or to vacate and close the dwelling, the public officer may cause such dwelling to be repaired, altered or improved or to be vacated and closed; that the public officer may cause to be posted on the main entrance of any dwelling so closed, a placard with the following words: "This building is unfit for human habitation; the use or occupation of this building for human habitation is prohibited and unlawful";

(5) That, if the owner fails to comply with an order to remove or demolish the dwelling, the public officer may cause such dwelling to be removed or demolished; and

(6) That the amount of the cost of such repairs, alterations or improvements, vacating and closing, or removal or demolition by the public officer shall be a lien against the real property upon which such cost was incurred and shall be collectible in the same manner as county taxes.

(7) If a county in demolishing unfit dwellings as permitted by this article contracts with a third party not employed by the county to do the work, it must bid the work in conformity with the Procurement Code applicable to the county.