Bolthole Index

King County, Washington

Pacific, Washington building permits, zoning and septic rules

Pacific, Washington issues building permits through the city Building Department and has its own zoning ordinance.12 For Pacific parcels in King County, septic approval comes from Public Health - Seattle & King County, separately from city building approval.3 Start with the city for construction and land-use questions; ask Public Health about any proposed septic system.145

At a glance

Building permits
City Building Department issues building, mechanical and plumbing permits1
Zoning
Pacific has its own zoning ordinance2
Building codes
City adopts the 2021 International Building and Residential Codes, with state amendments6
Septic permits
Public Health - Seattle & King County for King County parcels; new systems need approval before construction37
Electrical permits
Washington State Department of Labor & Industries6
Inspections
City field inspections accompany permitted construction18

Who to call

Building permits

City of Pacific Building Department

Building, mechanical and plumbing permits, plan review and construction inspections in Pacific. Email is for inspection requests.

[email protected]

Planning & zoning

City of Pacific Community Development Department

City planning, environmental and land-use decisions, and development application guidance.

253-929-1110

Septic permits

Public Health - Seattle & King County, Environmental Health Services

New on-site sewage system design and installation approvals for King County parcels.

206-477-8050

Contact details are copied from each office’s official page and were checked against it on October 15, 2026.

Off-grid gear

Going off-grid in Pacific means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

Do you need a building permit in Pacific, Washington?

Pacific’s Building Department issues building, mechanical and plumbing permits for new and existing construction, reviews project plans and performs field inspections.1 Pacific adopts the 2021 International Building Code and International Residential Code with Washington State Building Code Council amendments.6 Bring the proposed work to the city Building Department to establish the applicable building approval and inspection requirements.1 Electrical permits are administered separately by the Washington State Department of Labor & Industries.6

Does Pacific have zoning, and what about RVs or tiny homes?

Pacific has its own zoning ordinance; city land-use questions belong with Pacific Community Development.24 Ask Community Development to identify the parcel’s district and confirm allowed uses, lot size, setbacks and building height before choosing a house plan.4 We could not confirm Pacific’s rules for living in an RV, temporary camping, tiny-home occupancy or accessory dwellings; ask Community Development about the specific dwelling and intended use.4 Request a parcel-specific answer rather than assuming that a small or movable home has zoning approval.24

How do septic permits work inside Pacific?

For Pacific parcels in King County, Public Health - Seattle & King County administers on-site sewage approval.3 A new septic system needs a site application, design and installation permit, and construction cannot begin until the installation permit is posted on the property.7 An on-site sewage system designer submits the site application; after approval, a certified installer works with the designer to install the system.5 Ask Public Health and the city whether the proposed parcel can use septic or must connect to sewer; we could not confirm a Pacific-specific sewer-connection rule.54

Building a home in Pacific: what are the steps?

Start with Pacific Community Development: identify the parcel and describe the proposed dwelling so the planning office can address land use and environmental review.4 Next, establish the wastewater route; for a proposed septic system on a King County parcel, work through Public Health’s site application and installation approval.5 Take construction plans to the city Building Department for building review, and arrange electrical permitting with Washington Labor & Industries.16 Schedule city construction inspections through the Building Department; inspection requests go to [email protected].1

What stays with King County, and what should you check before buying?

For Pacific parcels in King County, septic approval remains with Public Health even though Pacific handles city building review and zoning.312 For land outside Pacific, use the King County guide: King County manages building permits and zoning in unincorporated areas, while cities have their own jurisdiction.9 Before buying inside Pacific, ask Community Development about floodplain review, driveway access, utility availability and the approvals needed for the intended use; we could not confirm Pacific-specific requirements for these topics.4

Watch-outs

  • We could not confirm Pacific’s RV or tiny-home occupancy rules; ask Community Development before planning to live on a parcel during construction.4
  • City building approval does not replace the new septic system application and installation permit required for King County parcels.17
  • We could not confirm Pacific’s building permit fees or certificate-of-occupancy requirements; ask the city Building Department for the requirements for your project.1

Sources

  1. City of Pacific Building Department (pacificwa.gov)
  2. Chapter 20.01 General Provisions, City of Pacific, WA (eCode360) (Pacific), quoted and re-checked
  3. On-site sewage/septic system program, quoted and re-checked
  4. City of Pacific Community Development Department (pacificwa.gov)
  5. Public Health - Seattle & King County, Environmental Health Services (kingcounty.gov)
  6. Building, City of Pacific, WA (Pacific), quoted and re-checked
  7. New design and installation, quoted and re-checked
  8. Building, City of Pacific, WA (Pacific), quoted and re-checked
  9. About King County zoning, quoted and re-checked

Written October 15, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Pacific

Pacific’s own rules

  • Building code adoptedAdopted

    Construction inside City of Pacific limits

    • Codes are as amended by the State Building Code Council.
    • Electrical permits are administered by the WA Dept. of L&I per the same page.

    building code edition: 2021 International Building Code and 2021 International Residential Code

    “building codes adopted by the city of pacific, as amended by the state of washington building code council (sbcc): 2021 international building code 2021 international residential code”
  • InspectionsRequired

    Permitted construction inside City of Pacific

    • Inspection requests must be received by 3pm prior to the inspection date.
    • Inspection hours are Wednesdays and Fridays noon-2:00p except holidays.
    “inspection hours wednesdays and fridays, noon-2:00p (except holidays). inspection requests must be received by 3pm prior to date of inspection.”
  • Local zoningPresent

    Land inside City of Pacific limits

    • Title 20 of the Pacific Municipal Code is the city zoning ordinance, adopted under chapter 35.63 RCW.
    • Chapter 20.01 shows many older administrative sections repealed by Ord. 1505.
    “the ordinance codified in this title and maps shall be known as, and may be cited and referred to as, "the city of pacific zoning ordinance" in accordance with, and exercising the authority of, chapter 35.63 rcw”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Pacific or King County directly.

  • Owner-builder exemption — Owner-builders inside City of Pacific
  • Certificate of occupancy — Occupancy of new dwellings inside City of Pacific
  • Zoning districts — Zoning districts inside City of Pacific
  • Minimum dwelling size — Single-family districts inside City of Pacific
  • Minimum lot size — Single-family districts inside City of Pacific
20 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Subdividing land
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Pacific publishes no rule on the point, not that none exists. King County’s page lists the county offices to call.

← All of King County: county rules, score and offices