Except as provided in subsections (c) and (d) of this section, the amount of development area in square feet allowable on a parcel or lot shall not exceed the amounts determined by application of the formula in subsection (a) of this section where An is net area in acres, S is the average slope of the parcel or lot in percent, as defined in Section
10-1.202, LUF is the lot unit factor as defined by Section
10-1.202 and MDA is the maximum development area allowable.
(a) Maximum Development Area Formula. For all parcels or lots, the allowable development area in square feet shall relate to the average slope of the parcel or lot and the Lot Unit Factor for the parcel or lot as specified in the formula given in subsections (1), (2), and (3) below:
(1) For parcels or lots where S is equal to or less than 10%:
MDA = LUF x 15,000 square feet.
(2) For parcels or lots where S is more than 10% and less than 30%:
MDA = LUF x [15,000 - 375 (S-10)] square feet.
(3) For parcels or lots where S is equal to or greater than 30%:
MDA = LUF x 7,500 square feet.
(b) Development Area. Development area shall be measured in a horizontal plane and shall include the following:
(1) Total floor area, as defined in Section
10-1.202 of this title;
(2) The total area of land covered by structures not counted in subsection (b)(1) of this section, such as parking areas, patios, decks, walkways, swimming pools and tennis courts, together with other surfaces comprised of artificially emplaced building materials such as paving, roofing, masonry, stone or wood;
(3) The first 100 feet of driveway, as measured along the center line, closest to the primary dwelling; and
(4) That portion of a driveway exceeding 12 feet in width which is located beyond the area described in subsection (b)(3) of this section.
Where there is a common driveway in a driveway easement or a panhandle and the driveway, or a portion of the driveway, serves more than one residence, then using the regulations stated in subsections (b)(3) and (b)(4) of this section, the amount of driveway area shall be proportioned to the residences based upon use of the driveway;
(5) Exemptions. Walkways constructed of unconsolidated building materials such as decomposed granite, tanbark and other wood chips; roof overhangs unsupported from the ground; and synthetic turf material with natural appearance and drainage characteristics similar to natural turf, when used on athletic fields at public recreational facilities and schools, subject to a conditional use permit approval by the City Council;
(6) Development Area Bonus. A development area bonus (500 square foot maximum) of one square foot for every one square foot of roof-mounted photovoltaic (PV) power generation facility (solar panels) shall be granted subject to the following requirements:
(i) The development area bonus shall apply only to properties that do not already exceed the maximum development area allowable,
(ii) The roof-mounted PV facility shall be grid tied or connected,
(iii) For new residences, the roof-mounted PF facility shall be fully installed and grid connected prior to the final inspection and occupancy of the new residence,
(iv) For all other structures and projects, the roof-mounted PV facility shall first be installed with a building permit and receive satisfactory final inspection prior to granting of the development area bonus,
(v) The development area bonus shall only be used for projects that otherwise comply with all other zoning and site development ordinances,
(vi) The maximum allowable development area bonus shall be reduced by one square foot for every one square foot of ground-mounted PV system over 500 square feet that is exempted from development area requirements by action of the Planning Commission,
(vii) Any development area bonus request may be referred to the Planning Commission by the Community Development Director. A development area bonus request for a property of less than one net acre in size shall be subject to Planning Commission review and decision,
(viii) Sunset Provision. This section shall expire on July 31, 2016,
(ix) The Community Development Director shall provide the City Council with an annual report that evaluates the effectiveness of this subsection as an incentive for increasing PV system installations;
(7) Photovoltaic Power Generation Facilities. Photovoltaic power generation facilities that are connected to the grid and that are 500 square feet or less are exempt from the requirements of this section. Photovoltaic power generation facilities greater than 500 square feet in area are subject to the requirements of this section, unless the Planning Commission determines that the off-site visual impacts of the facility are adequately mitigated.
(c) Minimum MDA. The allowable development area on any parcel or lot shall not be reduced to less than 7,500 square feet by application of the provisions of this section, except as set forth in Section
10-1.502(e) or except in the case of parcels or lots which have a lot unit factor of 0.50 or less. Parcels or lots which have a lot unit factor of 0.50 or less require a Conditional Development Permit and development area may be restricted below 7,500 square feet as a condition of the permit. Maximum development area for lots which require a Conditional Development Permit shall be established as the maximum floor area allowed by Section
10-1.503(c), plus 2,100 square feet. The Site Development Authority may approve development area of up to a total of 4,500 square feet for any lot or parcel without requiring a variance, so long as the findings for a Conditional Development Permit are made. Notwithstanding the foregoing, this subsection
(c) shall not apply to any parcel that has a LUF less than 1.0 and was created after the enabling date of the ordinance implementing this sentence.
(d) For any lot on which substantial areas of slope in excess of 30% constrain the allowable development area for the site, the lot unit factor and maximum development area may be calculated based solely on the flatter portion of the property, provided that: (1) the area used in the calculation results in a lot unit factor (LUF) in excess of 1.0 and provides a minimum of a 160 foot diameter building circle within that area; (2) the remaining steep slopes excluded from the calculation are contiguous and placed in a conservation easement, prohibiting any construction, grading or development in perpetuity; and (3) driveway access to the building site is located outside of the conservation easement area.
(e) The standards set forth in this section for maximum development area (MDA) are maximum standards. The City Council and Planning Commission have the discretion to apply stricter standards to reduce development area where site specific constraints dictate further limitations, such that the purposes of the ordinances are complied with. Some examples of site constraints include, but are not limited to, the shape or natural features of the lot, easements which restrict development, the potential for erosion, or high site visibility.
(§ 1, Ord. 305, eff. October 3, 1986, § 2, Ord. 313, eff. June 5, 1987; § 2, Ord. 382, eff. May 17, 1996; § 1, Ord. 389, eff. August 15, 1997; § 1, Ord. 412, eff. July 7, 2001; § 1, Ord. 431, eff. November 16, 2003; § 3, Ord. 446, eff. June 11, 2006; § 1, Ord. 500, eff. August 13, 2006; § 1, Ord. 522, eff. December 18, 2010; § 1, Ord. 547, eff. October 19, 2013; § 1, Ord. 552, eff. November 16, 2014; § 1, Ord. 610, eff. October 28, 2023)