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Building Safety in Snohomish County, WA (2026)

6 county-level rules, plus city-specific rules for 4 cities in Snohomish County, Washington.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Snohomish County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Scaffold & Sidewalk Shed

Scaffolding built over or into a county road right-of-way during construction, demolition, or repair needs a Type C2 permit and must carry a tarp underneath to stop debris from falling on the roadway below.

Scaffolding Rules in Snohomish County Right-of-Way

Some Restrictions

SCC 13.50.050

Type C2 permits for building construction, demolition, repair or scaffolding, within the opened right-of-way, are subject to the following additional conditions: ... (2) A substantial canvas tarpaulin or approved equivalent shall be attached to the underside of scaffolding erected in the opened right-of-way in such a manner as to stop any spray, dirt, or other materials from spreading on the ro...

Childcare Center Rules

Unincorporated Snohomish County regulates day care centers as a distinct land use under SCC 30.28.030. Outdoor play areas must be fenced or otherwise controlled, landscaping must meet chapter 30.25 SCC, and every center needs a license from the Washington State Department of Children, Youth, and Families before Planning and Development Services will sign off on the site.

Day Care Center Site Standards, Snohomish County

Some Restrictions

SCC 30.28.030

Day care centers are subject to the following performance standards: (1) Outdoor play areas shall have fencing or otherwise be controlled. (2) Landscaping shall be provided consistent with chapter 30.25 SCC. (3) Activities in outdoor play areas are subject to noise control requirements of chapter 10.01 SCC. The director or hearing examiner, as appropriate, may apply conditions during project ap...

Green Building Code

In unincorporated Snohomish County, new houses built inside a rural cluster subdivision or short subdivision cannot get an individual building permit until the lot is enrolled in a third-party green building certification program: Built Green Single Family/Townhome or LEED Home.

Rural Cluster Homes Need Green Certification

Some Restrictions

SCC 30.41C.030(6)

Conditions of approval for the subdivision or short subdivision shall require that all lots containing new buildings provide proof of enrollment in a third party certification program prior to issuance of individual building permits. Options for third-party certification are: (a) Built Green Single Family/Townhome certification for building permits; (b) LEED Home certification for building perm...

Building Permits

Any owner who intends to build, enlarge, alter, repair, move, demolish, or change the occupancy of a structure in unincorporated Snohomish County must first apply to the building official and obtain a permit before work starts. Gas, mechanical, and plumbing system changes trigger the same requirement.

When a Building Permit Is Required in Snohomish County

Some Restrictions

SCC 30.50.406

Any owner or owner's authorized agent who intends to construct, enlarge, alter, repair, move, demolish or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any gas, mechanical or plumbing system, the installation of which is regulated by this code, or to cause any such work to be performed, shall first make application to t...

Plumbing Permits

Unincorporated Snohomish County enforces the 2018 Uniform Plumbing Code as its plumbing code under SCC 30.52E.010. Any plumbing work needs a permit from the building official, fees set by chapter 30.86 SCC, before installation begins.

Plumbing Permits in Unincorporated Snohomish County

Some Restrictions

SCC 30.52E.010

The 2018 edition of the Uniform Plumbing Code (UPC) published by the International Association of Plumbing and Mechanical Officials, as amended by the Washington State Building Code Council, which includes Appendices A, B, and I, and included in chapter 19.27 RCW, except chapter 1, and as otherwise expressly amended, is incorporated herein and made a part of this chapter by reference and is ado...

Building Inspections

In unincorporated Snohomish County, the building official runs every required construction inspection, from a preliminary site check before a permit issues through follow-up inspections during work, and can accept certified reports from approved outside agencies or individuals in place of doing the inspection directly.

Building Inspection Stages in Snohomish County

Some Restrictions

SCC 30.50.108

The building official shall conduct all required inspections or have authority to accept reports of inspection by approved agencies or individuals. Reports of such inspections shall be in writing and be certified by an officer of an approved agency or by an approved individual. The building official is authorized to engage additional expert opinion as deemed necessary to report upon unusual tec...

Building Safety by City in Snohomish County

4 cities in Snohomish County have their own building safety rules. Each link goes to that city's dedicated page with code citations.

All Snohomish County ordinances

See every category we cover for Snohomish County: parking, noise, fences, fires, animals, pools, and more.

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