Building Safety in Pierce County, WA (2026)
5 county-level rules, plus city-specific rules for 2 cities in Pierce County, Washington.
Verified from official government sources
Fire Sprinkler Requirements
A new one- or two-family home in unincorporated Pierce County needs an automatic fire sprinkler system if it trips any one of seven triggers in PCC 17C.60.185.A: over 5,000 square feet of fire flow area, an unprotected parcel, location in Fire District 23, 25 or 26, three or more townhouse units, a site on one of five named islands, a setback under five feet, or driveway access steeper than 15 percent.
Pierce County Residential Fire Sprinkler Rule
Heavy RestrictionsPCC 17C.60.185.A
A. One- and Two-Family Dwellings. Section R313.2 of the International Residential Code is adopted and modified as follows. An approved automatic fire sprinkler system shall be installed in one- and two-family dwellings that meet any of the following: 1. Fire flow calculation area exceeding 5,000 square feet; 2. Located on an unprotected parcel; 3. Located in Fire District 23, Fire District 25 o...
Green Building Code
Pierce County does not mandate a green building code, but PCC 17C.10.070.F refunds up to 25 percent of a residential building permit fee, capped at $350, when the finished home earns Built Green 4- or 5-star certification or LEED for Homes Gold or Platinum. The applicant must request the refund within 90 days of the certificate of occupancy, and the county caps total refunds at $25,000 per year.
Pierce County Green Building Fee Refund
Light RestrictionsPCC 17C.10.070.F
F. Green Building. A permit applicant who employs sustainable building practices in the construction of a residential structure shall be eligible for up to a 25 percent refund of the permit fee calculated and paid for said structure pursuant to Table 17C.10-1-B when all of the following requirements are met: 1. The structure receiving the fee reduction receives one of the following certificatio...
Building Permits
Pierce County adopts the International Residential Code and requires a building permit for nearly all construction in unincorporated areas, but PCC 17C.30.040 carves out 15 specific categories of work that need no permit at all, from small tool sheds to shallow above-ground spas. Anything outside that exempt list, including additions, new dwellings, and most accessory structures, needs a permit from Planning and Public Works before work starts.
When Pierce County Requires a Building Permit
Some RestrictionsPierce County Code 17C.30.040
Section R105.2 of the International Residential Code is amended as follows: 1. One story detached accessory structure used as unheated tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 200 square feet (18.58 m2) and it is at least three feet from a property line. 2. Fences not over six feet (1829 mm) high. 3. Retaining walls that are not over four feet...
Plumbing Permits
Pierce County plumbs unincorporated properties under the Uniform Plumbing Code as adopted by the Washington State Building Code Council in WAC Title 51, per PCC 17C.50.010, with local amendments in Chapter 17C.50 PCC controlling wherever they conflict with the state text. A permit is required for plumbing work, fees run through the Table 17C.10-1-D schedule, and enforcement follows the same Building Official process as every other Title 17C code.
Pierce County Plumbing Permit Code
Some RestrictionsPCC 17C.50.010
The edition of the Uniform Plumbing Code, currently, or hereafter, adopted and amended by the State Building Code Council and included in Title 51 of the Washington Administrative Code, including Appendix Chapters A, B, D, E, I, and L, are adopted as the Plumbing Code for the unincorporated areas of Pierce County; except that the amendments to the Uniform Plumbing Code in this Chapter shall gov...
Building Inspections
Pierce County will not sign off on a final occupancy or final building inspection for any residential, commercial, or industrial structure until the site's stormwater and drainage work clears final construction approval under PCC 17A.10.090. That approval itself requires a completed County Inspector punchlist, an engineer's inspection report, record drawings, and a posted maintenance guarantee. A rejected inspection can also trigger a reinspection fee.
Pierce County Final Building Inspection Rules
Some RestrictionsPCC 17A.10.100
Final occupancy and/or final inspection approval of residential, commercial, and industrial structures will not be granted until such time that final site development construction approval is achieved in accordance with PCC 17A.10.090.
Building Safety by City in Pierce County
2 cities in Pierce County have their own building safety rules. Each link goes to that city's dedicated page with code citations.
All Pierce County ordinances
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