18A.15.030 Lot Dimension.
A. Lot Width Measurement.
1. When a lot has four sides, or has more than four sides and has an essentially rectangular or pie shape, the lot width shall be the horizontal distance between the side lot lines measured at right angles to the line comprising the depth of the lot at a point midway between the lot front and the lot rear line. For pipestem or flag lots, the access easement or lot extension shall not be included in determining the depth of the lot.
2. For lots with more than four sides that are irregular in shape, lot width shall be measured at the widest portion of the lot between the side lot lines.
3. As an alternative to 1. and 2. above, lot width may be measured at the location of the proposed principal building development.
B. Situational Lot Dimension Provisions.
1. 25-foot-wide Lots. For residential development of lots that are 25 feet in width or less, two such lots shall be required to construct one detached single-family dwelling unit, and three such lots shall be required to construct a duplex, when all of the following apply:
a. Two or more such lots are in contiguous and common ownership;
b. The lots are located in an SF, RR, or MSF zone classification; and
c. The lots were created prior to August 13, 1974.
d. Such a use is permitted in the underlying zone pursuant to the appropriate Use Table in Title 18A PCC.
2. MSF and SF.
a. LID. Average and minimum lot sizes shall not apply to low impact development projects designed pursuant to the Pierce County Stormwater Management Manual and Site Development Manual, Volume VI.
b. Critical Areas. Average and minimum lot size may be reduced up to 2,000 square feet for those sites containing critical areas or their buffers when it is determined that:
(1) Compliance with critical area requirements in combination with the average lot size requirement would prevent a density of four dwelling units per net acre from being achieved;
(2) The reduction in average lot size is the minimum necessary to achieve a density of four dwelling units per acre; and
(3) In no case shall the minimum lot size in the SF be reduced less than 5,000 square feet.
c. PDD. Average lot size reductions may be allowed with a Planned Development District permit pursuant to PCC 18A.75.050.
3. Rural and Resource Zones. Minimum lot size may be reduced to 1 acre (2 acres on Anderson Island) within a short subdivision or formal subdivision and to 5 acres within a large lot division, provided the short subdivision, large lot division, or formal subdivision remains in compliance with the density requirements of the applicable zone, except when located in the ARL or FL zone classifications.