A. 
This chapter is adopted pursuant to Wyoming Statutes, 1977, sections 15-1-601 to 15-1-611. The purposes of this chapter are to encourage, classify, designate, regulate, restrict and segregate the highest and best location and use of buildings, structures and land for residence, recreation, commerce, trade, industry or other purposes in appropriate places; to regulate and limit the height, number of stories and size of buildings and other structures hereafter designed, erected or altered; to regulate and determine size of yards and other open spaces; and to regulate and limit the density of population; and for such purposes to divide the City into zones of such number, shape and area as may be deemed best suited to carry out the regulations contained in this chapter and provide for their enforcement.
B. 
Such regulations are necessary in order to encourage the most appropriate use of land; to conserve spaces for light and air and to prevent and fight fires; to prevent undue concentration of population; to lessen congestion of streets and highways; to conserve the environment by protection against land abuse and emission of noxious fumes, noise and contaminant particulates in the interest of public health; to facilitate adequate provisions for community utilities such as transportation, water, sewerage, schools, parks and other public requirements; and to promote the public health, safety, morals and general welfare, all in accordance with the master plan for the City.
The territorial jurisdiction of the regulations found in this chapter shall include all of the incorporated lands located within the City, and, pursuant to Wyoming Statutes, 1977, section 15-3-202, such other territory peripheral to the City which is located within one-half mile of the corporate limits.
In interpreting and applying the provisions of this chapter, they shall be held to be the minimum requirements for the promotion of the public health, safety, convenience, comfort, prosperity and general welfare. It is not intended by this chapter to interfere with or abrogate or annul any easements, covenants or other agreements between parties; provided, that where this chapter imposes a greater restriction upon the uses of buildings or premises or upon height of buildings or requires larger space than is imposed or required by other ordinances, rules or regulations, or by easements, covenants or agreements, the provisions of this chapter shall govern.
Nothing contained in this chapter shall require any change in the plans, construction or designated use of a building upon which actual construction has begun. "Actual construction" means the actual placing of construction materials in their permanent position, fastened in a permanent manner; except that where a basement is being excavated, such excavation shall be deemed to be actual construction or where demolishing or removal of an existing building or structure has been begun preparatory to rebuilding, such demolition or removal of an existing building or structure shall be deemed to be actual construction, providing, in all cases that actual construction work is diligently carried on until the completion of the building or structure involved.