Bolthole Index

Pierce County, Washington

Building permits, zoning and septic rules in Pierce County, Washington

51Index Score / 100
#26 of 39 in Washington

Unincorporated Pierce County, Washington requires a building permit to construct or renovate a residence unless the work is specifically exempt1. Pierce County Planning & Public Works administers building codes and zoning for unincorporated land; the Tacoma-Pierce County Health Department handles septic permitting234. Ordinary RV, travel-trailer and tent occupancy requires a temporary-use permit and cannot become indefinite housing5.

At a glance

Building permit
Required to construct or renovate a residence unless the structure is specifically exempt1
Zoning
Pierce County administers zoning throughout unincorporated areas; standards depend on the parcel's zone and community plan36
Septic
Permitted by the Tacoma-Pierce County Health Department, with final inspection of installed systems47
Owner-builder
Qualifying work on your own property is exempt from contractor registration, not building or other permit requirements8
RV living
Ordinary occupancy needs a temporary-use permit; more than 120 days in any 12-month period is permanent occupancy, with limited exceptions59
Tiny home
A site-built tiny home under 400 sq ft follows the regular home-permit process and needs approved water and sewage disposal1011
Minimum home size
IBC dwelling units need at least 190 sq ft of habitable space; this is not a countywide minimum total floor area12

Who to call

Building permits

Pierce County Development Center

Building permits, land use actions, site development permits, environmental review, sewer utility permits and fire prevention permits for unincorporated Pierce County

(253) 798-3739

Pierce County Annex, East Entrance, 2401 S 35th St., Tacoma, WA 98409

Zoning

Pierce County Planning & Public Works

Zoning administration, parcel zoning lookups and land-use planning for unincorporated Pierce County

(253) 798-7250

Septic permits

Tacoma-Pierce County Health Department

On-site sewage (septic) system permitting and review for Pierce County under Washington DOH rules

(253) 649-1500

3629 S. D St., Tacoma, WA 98418-6813

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 Pierce County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Pierce County, Washington?

Construction or renovation of a residence in unincorporated Pierce County requires a county building permit unless the work is specifically exempt1. Pierce County administers its adopted building and fire codes through Title 17C in the county's jurisdiction2. Washington lets an owner work on the owner's own property without contractor registration when the project is not being done to sell, demolish or lease the property, but building, electrical, plumbing, septic and other permit rules still apply8. Temporary growing structures used only to produce horticultural plants have a narrow state building-code exemption; that is not a general exemption for houses, barns or other agricultural buildings13. Puyallup, Bonney Lake, Edgewood, Milton and Fircrest issue their own building permits1415161718. Septic systems remain under Tacoma-Pierce County Health Department regulation4.

Who is the Pierce County building department, and how do you reach them?

The Pierce County Development Center is the central office for building permits, land-use actions, site-development permits, environmental reviews, sewer utility permits and fire-prevention permits19. The Development Center is at the Pierce County Annex, East Entrance, 2401 S 35th St., Tacoma, WA 98409, and its phone number is (253) 798-373919. Start with parcel research, gather the listed submittal items, prepare a site plan, upload the application materials as PDFs and track the review; Level 1 screening is required for certain projects, including properties with septic systems or private wells20. Pierce County publishes separate fee resources for construction, land use, impact and fire-prevention permits, so use the current schedule for the actual charge21. Pierce County’s published temporary certificate-of-occupancy process concerns commercial occupancy and does not replace a final certificate; ask the Development Center which inspections and final approval a residence needs2219.

Does Pierce County have zoning?

Pierce County Planning & Public Works administers zoning in unincorporated Pierce County; incorporated parcels follow city zoning323. Use the parcel number or site address to find the applicable community-plan use and dimension tables; setbacks are measured from property lines, and setback and height limits depend on the zone62425. Rural and resource-zone lot sizes are district-specific, and land divisions and boundary changes fall under county development regulations2627. Lakewood, University Place, Sumner, Fife, DuPont, Milton, Fircrest, Buckley and Ruston administer their own zoning282930313233343536. Septic and individual-well regulation remains with the Tacoma-Pierce County Health Department4.

How do septic permits work in Pierce County?

The Tacoma-Pierce County Health Department regulates and permits on-site septic systems and individual wells in Pierce County37. The department's process includes an installation permit and final inspection, although requirements vary by system type and site conditions387. For a permitted repair or replacement, the installer must leave the system uncovered until the designer or engineer and Health Department inspect and approve it; the department visits within 3 business days after processing the final-inspection request, and the system cannot be used until its record drawing is approved39. Only 0.8% of Pierce County soils are rated without severe limitations for a conventional drain field, so make septic feasibility an early purchase contingency40. Call (253) 649-1500 or visit 3629 S. D St., Tacoma, WA 98418-681341.

Can you live in an RV or tiny home on your land in Pierce County?

Pierce County does not allow an RV, travel trailer or tent to serve as an indefinite dwelling in unincorporated areas; ordinary occupancy requires a temporary-use permit, and more than 120 days in any 12-month period counts as permanent occupancy outside the stated exceptions5. An undeveloped lot inside the unincorporated Urban Growth Area is stricter: an RV, travel trailer or tent cannot be occupied unless the lot qualifies for the shoreline exception42. A park-model tiny home is treated as an RV and needs no building permit for the vehicle itself, although other approvals may apply: recreational placement requires a Temporary Use Permit and is limited to 120 days per year, while permanent placement is allowed in a mobile home park or as a Temporary Housing Unit for Family943. A site-built tiny home is under 400 square feet, excluding its sleeping loft, and must meet residential and energy codes, setbacks, driveway and lot-coverage rules, and approved water and sewage requirements; composting or incinerator toilets and rainwater catchment for potable water are not allowed10441145. Factory-built tiny homes follow manufactured-home permitting and state factory-built standards1044.

Building a home in Pierce County: the steps, in order

  1. Confirm that the parcel is unincorporated, then look up its zone and the applicable use, setback, lot-coverage and height tables before choosing a plan236244525.
  2. Research the parcel, assemble the required submittal items, prepare the site plan and complete Level 1 screening when the property's conditions require it46.
  3. For land without sewer, obtain the applicable septic approval and installation permit from the Tacoma-Pierce County Health Department3738.
  4. Obtain Planning & Public Works approval for work in a county right-of-way, or written WSDOT permission for a state-highway connection4748.
  5. Show the 100-year flood-hazard area on plans for a potentially affected site and complete any required studies or floodplain review4950.
  6. Submit the residential building-permit package, pay the charges in the current county fee schedule and schedule the required inspections15152.

What to check before you buy land in Pierce County

Confirm whether the parcel is in a city or unincorporated Pierce County, then verify its zone, minimum lot size, setbacks, lot coverage and height limit2326244525. If you plan to divide land or adjust a boundary, account for Pierce County's land-division rules before relying on a proposed parcel layout27. Do not plan on an RV as indefinite housing, and do not assume an undeveloped urban lot can host one even temporarily542. Verify flood hazards and driveway authority before treating a building site as usable4947. Pierce County's effective property-tax rate is about 0.9%, and its median annual property-tax bill is about $4,5555354. Short-term vacation rentals in single-family homes or ADUs require an affidavit to Planning & Public Works stating intent, contact information and advertising sites55.

Watch-outs

  • Pierce County ADUs may be within, attached to or detached from a single-family structure and must meet the residential accessory-development standards; ask Planning & Public Works to confirm current size and placement limits5657.
  • The owner-builder exemption only excuses qualifying work from Washington's contractor-registration law; building, electrical, plumbing, septic and other requirements may still apply8.
  • An undeveloped lot in unincorporated Pierce County’s Urban Growth Area cannot host occupied RVs, travel trailers or tents unless the lot qualifies for the shoreline exception42.

Sources

  1. Residential, quoted and re-checked
  2. Codes Administered by PPW, quoted and re-checked
  3. Codes Administered by PPW, quoted and re-checked
  4. Septic, quoted and re-checked
  5. pierce.county.codes, quoted and re-checked
  6. piercecountywa.gov, quoted and re-checked
  7. Septic System and Individual Well Forms and Applications, quoted and re-checked
  8. RCW 18.27.090: Exemptions, quoted and re-checked
  9. Tiny Homes, quoted and re-checked
  10. Tiny Homes, quoted and re-checked
  11. Tiny Homes, quoted and re-checked
  12. 17C.20.010 Adoption of International Building Code, quoted and re-checked
  13. RCW 19.27.065 — Exemption—Temporary growing structures used for production of horticultural plants (Washington statewide rule), quoted and re-checked
  14. Puyallup: Chapter 17.04 Building Codes - City of Puyallup, WA (eCode360) (Pierce County), quoted and re-checked
  15. Bonney Lake: Building Permits (Pierce County), quoted and re-checked
  16. Edgewood: Edgewood Municipal Code Chapter 15.30 Residential Code (eCode360) (Pierce County), quoted and re-checked
  17. Milton: FAQs - City of Milton, WA (Pierce County), quoted and re-checked
  18. Fircrest: ADU Information & FAQ - City of Fircrest (Pierce County), quoted and re-checked
  19. Pierce County Development Center (piercecountywa.gov)
  20. piercecountywa.gov, quoted and re-checked
  21. Development Center, quoted and re-checked
  22. Updates: Inspections, TCOs, and Permit Extensions, quoted and re-checked
  23. Zoning/Land Use - Designations, quoted and re-checked
  24. piercecountywa.gov, quoted and re-checked
  25. piercecountywa.gov, quoted and re-checked
  26. piercecountywa.gov, quoted and re-checked
  27. Codes Administered by PPW, quoted and re-checked
  28. Lakewood: City of Lakewood Planning & Public Works: ADU Street Frontage Improvements Interpretation (Pierce County), quoted and re-checked
  29. University Place: City of University Place, WA Municipal Code table of contents (eCode360) (Pierce County), quoted and re-checked
  30. Sumner: Chapter 18.02 General Provisions, Sumner Municipal Code Title 18 Zoning (Pierce County), quoted and re-checked
  31. Fife: Chapter 19.68 Specific Use and Structure Regulations - City of Fife, WA (eCode360) (Pierce County), quoted and re-checked
  32. DuPont: Chapter 25.36: Mixed Use District-2 - City of DuPont, WA (eCode360) (Pierce County), quoted and re-checked
  33. Milton: Chapter 17.44 General Use Regulations - City of Milton, WA (eCode360) (Pierce County), quoted and re-checked
  34. Fircrest: ADU Information & FAQ - City of Fircrest (Pierce County), quoted and re-checked
  35. Buckley: City of Buckley, WA Municipal Code table of contents (eCode360) (Pierce County), quoted and re-checked
  36. Ruston: RMC 25.01.040 Residential District (RES) (Pierce County), quoted and re-checked
  37. Regulations and Procedures, quoted and re-checked
  38. Septic System and Individual Well Forms and Applications, quoted and re-checked
  39. Septic System Failure, quoted and re-checked
  40. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  41. Tacoma-Pierce County Health Department (tpchd.org)
  42. pierce.county.codes, quoted and re-checked
  43. Tiny Homes, quoted and re-checked
  44. Tiny Homes, quoted and re-checked
  45. Tiny Homes, quoted and re-checked
  46. piercecountywa.gov, quoted and re-checked
  47. Development Center Driveway and Flood FAQs, quoted and re-checked
  48. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
  49. Pierce County Stormwater and Site Development Manual, quoted and re-checked
  50. Planning & regulation — Washington State Department of Ecology (Washington statewide rule), quoted and re-checked
  51. piercecountywa.gov, quoted and re-checked
  52. WAC 51-11R-10500 — Section R105—Inspections (Washington statewide rule), quoted and re-checked
  53. Effective property tax rate: Bolthole Index county data
  54. Median property tax bill: Bolthole Index county data
  55. Land Use & Housing Code Updates, quoted and re-checked
  56. Land Use & Housing Code Updates, quoted and re-checked
  57. Pierce County Planning & Public Works (piercecountywa.gov)

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.

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Compared with neighboring counties

Like all 6 of its neighbors, Pierce County has countywide zoning.

RulePierce CountyKing CountyLewis CountyThurston CountyKitsap CountyMason CountyKittitas County
Building permitRequiredRequiredRequiredRequiredLimitedRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsTacoma-Pierce County Health Dept.Public HealthCounty Env. HealthCounty Public Health & Social ServicesKitsap Public Health DistrictCounty Community ServicesCounty Public Health Dept.

County locator

Pierce County in Washington

51
County map
Pierce County highlighted among the Washington counties · colored by Index score

How Pierce County scores

Seclusion36100% ev.
Self-Sufficiency47100% ev.
Admin Boringness41100% ev.
Durability59100% ev.
Property Autonomy50100% ev.
Carry Cost33100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$573kTypical home
0.9%Property tax
$28,343Land / acre
65.4"Annual rain
4.5% of yrsSevere drought
0.2 / yr (+0.2)Mid-century 100°F days
20.5 daysMid-century dry spell
1.94" (+7.6%)Mid-century 1-day rain
1.4×Wildfire change factor
100%Forward climate coverage
$1,299Home insurance / yr
1.5% / yrInsurance growth
0.78%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
28,813People within 30 min
4,797,868People within 2 hr
436,734Radius comparison (15 mi)
556.8People / sq mi
38%Federal land
49.7%Land at 15% slope or less
0.8%Soils rated "not limited" for septic (strict USDA rating)
8,491 acWorkable land screen
76.3%Wooded land
107.8 tonsBiomass / forest ac
47.2°FAvg temp

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Cities and towns in Pierce County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Buckley · Town of Carbonado · Town of Eatonville · Edgewood · Gig Harbor · Lakewood · Orting · Roy · Town of South Prairie · Town of Steilacoom · Sumner · Tacoma · Town of Wilkeson

Answers from the rulebook for Pierce County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Pierce County rules

  • Building permitRequired

    Construction or renovation of residential structures in unincorporated Pierce County.

    • Structures specifically listed as exempt from permitting are excepted.
    • Level 1 pre-application screening is required for certain projects with critical-area indicators, special site restrictions, or on-site septic systems or private wells.
    “If you are proposing to construct or renovate a residential structure, you need to apply for a permit from Pierce County”
    One more reviewed finding on this topic
    • Required — Construction or renovation of residential structures in unincorporated Pierce County.
      “If you are proposing to construct or renovate a residential structure, you need to apply for a permit from Pierce County (except those structures - listed here - which are exempt from permitting requirements).”
  • Building code adoptedAdopted

    Construction regulations administered by Pierce County PPW in unincorporated Pierce County.

    • The county page identifies Title 17C as Building and Fire Codes and states County Code is adopted by the County Council.
    “Title 17C—Construction and Infrastructure Regulations—Building and Fire Codes”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Pierce County administration of building and fire codes through Title 17C.
      “PPW is responsible for administering and enforcing land use, transportation, utilities, and construction regulations in unincorporated Pierce County. These regulations (laws) are known as County Code and are adopted by the County Council.”
  • Certificate of occupancyLimited

    Commercial temporary occupancy in unincorporated Pierce County.

    • A temporary Certificate of Occupancy does not replace the final Certificate of Occupancy.
    • The cited temporary process requires an application and a $230 review fee.

    review fee: 230 USD

    “a TCO is temporary and does not replace the final Certificate of Occupancy.”
  • County-wide zoningPresent (with conditions)

    Land-use zoning administered by Pierce County Planning and Public Works in unincorporated Pierce County.

    • The cited county administration is expressly for unincorporated Pierce County.
    • County zoning is subject to the County Code, including Title 18A.
    “PPW is responsible for administering and enforcing land use, transportation, utilities, and construction regulations in unincorporated Pierce County. [...] Title 18A—Development Regulations—Zoning”
    One more reviewed finding on this topic
    • Present — County zoning administered by Pierce County Planning and Public Works in unincorporated Pierce County.
      “land use, transportation, utilities, and construction regulations in unincorporated Pierce County.”
  • Local zoningVaries (with conditions)

    Zoning across Pierce County: Pierce County zoning applies in unincorporated areas, while incorporated-city parcels are governed by the city whose jurisdiction contains the parcel.

    • The county source expressly excludes city zoning from the county dataset.
    • Zones are adopted by ordinances with specific technicalities for each community.
    • Current city boundaries should be checked for parcels near a city.
    “Zoning for cities is not included in this dataset. [...] Zoning codes for parcels within incorporated cities are determined by the city that the parcel is within.”
  • Zoning districtsPublished (with conditions)

    Pierce County zoning districts and associated use, density, setback, and height standards in unincorporated areas.

    • Title 18A is the county zoning title identified by Pierce County.
    • Parcel-specific zoning requires a parcel number or site address.
    • Zone-specific standards are in the applicable community-plan and density/dimension tables.
    “The Pierce County zoning code (Title 18A) is available online as a PDF. [...] Allowable uses are grouped by community plan and then by Urban and Rural zones within the zoning code.”
    One more reviewed finding on this topic
    • Published — Pierce County zoning districts and use tables for unincorporated areas.
      “Allowable uses are grouped by community plan”
  • Minimum dwelling sizeSpecified

    Dwelling units subject to the International Building Code in unincorporated Pierce County.

    • Pierce County adopts the state-adopted and amended International Building Code for unincorporated areas.
    • The 190-square-foot requirement is for habitable space, not necessarily total gross floor area.
    • Room-area requirements also apply: at least one room must have 120 square feet of net floor area; sleeping units and other habitable rooms must have at least 70 square feet of net floor area.
    • Kitchens are not required to have a minimum floor area.
    • Pierce County amendments to the International Building Code govern over published code provisions.

    minimum habitable space: >= 190 square feet · minimum area of one room: >= 120 square feet net floor area · minimum area of sleeping units and other habitable rooms: >= 70 square feet net floor area (Kitchens are not required to be of a minimum floor area.)

    “1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m 2) of habitable space.”
  • Minimum lot sizeDistrict specific (with conditions)

    Minimum lot-size rules for rural and resource zones in unincorporated Pierce County.

    • The quoted reduction applies within a short subdivision or formal subdivision, or within a large lot division.
    • The resulting subdivision or division must remain in compliance with the density requirements of the applicable zone.
    • The stated reduction does not apply when the property is in the ARL or FL zone classifications.
    • Anderson Island has a 2-acre figure instead of the otherwise stated 1-acre figure for the specified subdivision or division context.

    minimum lot size reduction in short or formal subdivision: 1 acre (2 acres on Anderson Island) · minimum lot size in large lot division: 5 acres (subject to applicable-zone density compliance; not applicable in ARL or FL)

    “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”
  • SetbacksSpecified

    Building setbacks under Pierce County zoning regulations.

    • Setbacks are based on the property's zone classification.
    • Title 18A density and dimension tables specify setbacks for interior, rear, and road-abutting yards.
    • Setback exceptions are provided in Pierce County Code 18A.15.040.
    • Setbacks are measured from the property line; special-use approvals may allow different setbacks.
    “Setback standards are provided in the Density and Dimensions tables for each community plan area and for the areas outside of all the community plan areas.”
    One more reviewed finding on this topic
    • Specified — Building setbacks in unincorporated Pierce County.
      “Setback standards are provided in the Density and Dimensions tables”
  • Lot coverageSpecified

    Lot-coverage requirements for site-built tiny homes and applicable zoning districts.

    • The Tiny Homes guide requires compliance with lot-coverage requirements; the numeric limit depends on the applicable zoning rules.
    “Meet all setback, driveway, and lot coverage requirements.”
  • Building heightSpecified

    Building-height limits under Pierce County zoning regulations.

    • The height limit depends on zone classification.
    • Title 18A density and dimension tables specify the height limits allowed for each zone.
    “Structural heights are restricted based upon zone classification. Height limitations are specified in the Density and Dimension Tables provided for the areas not included in a community plan, and for each community plan area.”
    One more reviewed finding on this topic
    • Specified — Building-height standards by Pierce County zone classification in unincorporated Pierce County.
      “The height limit for your property is based on your zone classification”
  • Living in an RVTemporary only (with conditions)

    Occupancy of recreational vehicles, travel trailers, or tents in unincorporated Pierce County.

    • A temporary use permit is required.
    • Occupancy is illegal if it exceeds the period allowed by the temporary use permit.
    • Recreational vehicles, travel trailers, or tents may not be used as a permanent place of abode or dwelling for indefinite periods, except as stipulated for mobile home parks under PCC 18J.15.200.
    • Occupancy for more than 120 days in any 12-month period is considered permanent occupancy, except for Temporary Housing Communities regulated under PCC 18A.38.040.
    • The current temporary-use table lists Camping and Recreational Vehicle Use at 120 days in Urban Centers, Urban Districts, Urban Residential, Resource Lands, Rural Centers, and Rural Residential; the Employment Center column has no listed number of days in the cited table.
    • Temporary Housing Communities require establishment by religious, nonprofit, or governmental organizations through a Memorandum of Understanding with the Pierce County Human Services Department and are subject to separate standards.

    maximum ordinary camping/recreational vehicle occupancy: 120 days in any 12-month period (Temporary Housing Communities under PCC 18A.38.040 and mobile-home-park rules under PCC 18J.15.200)

    “Recreational vehicles, travel trailers, or tents shall not be used as a permanent place of abode, or dwelling, for indefinite periods of time, except as stipulated in PCC 18J.15.200 for mobile home parks. Occupancy of a recreational vehicle, travel trailer or tent, or combination thereof, for more than 120 days in any 12-month period shall be considered permanent occupancy except for Temporary Housing Communities, which are subject to the standards set forth in PCC 18A.38.040.”
    3 more reviewed findings on this topic
    • Prohibited — Occupancy of an RV, travel trailer, or tent on an undeveloped lot within the urban growth area of unincorporated Pierce County, except qualifying shoreline lots.
      “Provided that, however, urban lots located on a Shoreline of the State and within a Shoreline Environment that permits residential or recreational use may host a recreational vehicle, travel trailer, or tent for the temporary period noted in PCC 18A.38.020, whether the lot is developed or undeveloped. All other recreational vehicles, tents, or travel trailers on undeveloped lots located within the urban growth area shall not be occupied for any period of time.”
    • Limited — Park-model recreational vehicles and tiny homes on wheels in Pierce County.
      “Park model RVs can be located permanently in a mobile home park, as a Temporary Housing Unit for Family, or for recreational purposes with a Temporary Use Permit for a maximum of 120 days per year”
    • Limited — Park-model RV occupancy in unincorporated Pierce County.
      “for recreational purposes with a Temporary Use Permit for a maximum of 120 days per year”
  • Camping on your landLimited

    Recreational occupancy of park-model RVs or tiny homes on wheels.

    • A Temporary Use Permit is required for recreational placement described in the tiny-home guide.
    • The maximum is 120 days per year.
    • This claim is limited to the park-model RV/tiny-home use addressed by the official guide.

    maximum temporary recreational occupancy: 120 days per year

    “Park model RVs can be located permanently in a mobile home park, as a Temporary Housing Unit for Family, or for recreational purposes with a Temporary Use Permit for a maximum of 120 days per year”
    One more reviewed finding on this topic
    • Limited — Recreational temporary occupancy of park-model RVs in unincorporated Pierce County.
      “for recreational purposes with a Temporary Use Permit for a maximum of 120 days per year”
  • Tiny homesAllowed (with conditions)

    Site-built and factory-built tiny homes in unincorporated Pierce County.

    • A site-built tiny home must comply with the current IRC and Washington State Energy Code, have approved water supply and sewage disposal, and meet setback, driveway, and lot-coverage requirements.
    • A factory-built tiny home must comply with Washington HUD standards and the state L&I Factory Assembly Structures program.
    • HOA restrictions may apply.

    tiny-home size threshold: < 400 square feet (sleeping loft area excluded)

    “Permitted through the same process as a larger single-family residence.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Site-built, factory-built, and park-model tiny homes in unincorporated Pierce County.
      “A tiny home is a small residence less than 400 square feet, not including sleeping loft area, placed on a permanent foundation, and intended for use as a residence. [...] Permitted through the same process as a larger single-family residence.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units accessory to existing single-family residential structures in unincorporated Pierce County.

    • An owner occupant must apply for a Building Permit.
    • All size thresholds and design standards must be met.
    • ADUs are only allowed accessory to existing single-family residential structures.
    • Urban Growth Area ADUs may be no more than 1,000 square feet; outside the Urban Growth Area, no more than 1,250 square feet.
    • Other design requirements apply under Section 18A.36.070.

    maximum ADU size in Urban Growth Area: <= 1000 square feet · maximum ADU size outside Urban Growth Area: <= 1250 square feet

    “The owner occupant shall apply for a Building Permit for an ADU. A complete application form must demonstrate that all size thresholds and design standards are met. [...] ADUs are only allowed accessory to existing single-family residential structures. ADUs within the Urban Growth Area may be no more than 1,000 square feet in size. ADUs outside the Urban Growth Area may be no more than 1,250 square feet in size.”
    One more reviewed finding on this topic
    • Limited — Accessory dwelling units in unincorporated Pierce County.
      “ADUs, or accessory dwelling units, are a dwelling unit within, attached to, or detached from a single-family structure as an independent unit with space for living, sleeping, cooking, and sanitation. Accessory dwellings must meet the standards found in 18A.37.120.”
  • Who permits septicLocal

    On-site sewage and well regulation for Pierce County by the Tacoma-Pierce County Health Department.

    • The health department page also identifies applicable county and state regulations.
    “We regulate and enforce installation of septic systems and wells.”
    One more reviewed finding on this topic
    • Local — On-site sewage and individual-well regulation and permitting for Pierce County through the Tacoma-Pierce County Health Department.
      “Are you a septic pro who works in Pierce County? Access helpful policies, regulations, guidelines and resources. Learn how to become a Certified Professional in Pierce County.”
  • Septic permitRequired

    Installation of on-site septic systems in Pierce County's Tacoma-Pierce County Health Department jurisdiction.

    • The official application page provides an installation-permit release request and a final-inspection request.
    • Specific permit requirements may vary by system type and site conditions.
    “Installation—Get an installation permit and have the system or component installed, if applicable.”
  • Septic inspectionLimited

    Permitted septic-system repairs or replacements in Pierce County administered by the Tacoma-Pierce County Health Department.

    • The page addresses permitted repairs and replacements, not every existing septic system.
    • The installer must complete installation before the designer or engineer submits the final inspection request.
    • The Health Department visits within 3 business days after processing the request.
    • The installer must not backfill until the designer or engineer and the Health Department inspect and approve the final installation.
    • A complete record drawing must be submitted, and the system is not approved for use until the record drawing is approved.

    Health Department site visit after final inspection request: <= 3 business days (after the request is processed)

    “We will visit the site within 3 business days after we process the final inspection request.”
    One more reviewed finding on this topic
  • Off-grid sanitationLimited

    Off-grid sanitation and potable-water systems for site-built tiny homes.

    • The Tiny Homes guide states that approved water supply and sewage disposal are required.
    • Composting or incinerator toilets and rainwater catchment for potable water are not allowed.
    “Composting or incinerator toilets and rainwater catchment for potable water is not allowed.”
  • Subdividing landRegulated (with conditions)

    Land division and boundary changes administered under Pierce County development regulations.

    • Specific plat, short-plat, boundary-adjustment, and environmental requirements were not fully extracted.
    “Title 18F—Land Division and Boundary Changes”
  • Driveway accessLimited

    Driveway access and work in Pierce County rights-of-way.

    • Any work within the county right-of-way requires PPW approval.
    • If the driveway is in a critical area, a permit may be required.
    • Driveway approach approval addresses sight distance, width, grade, surfacing, and emergency vehicle access.
    “Any work within the County right-of-way does require approval from Planning & Public Works.”
  • Building in a floodplainLimited

    Development in Pierce County flood-hazard areas.

    • Projects in potential flood-hazard areas must show the 100-year flood-hazard area on plans.
    • The county may require establishment and mapping of the 100-year flood-hazard area when it has not been established or is considered erroneous.
    • Additional studies may be required under PCC Title 18E.70.

    design flood: 100 year flood

    “show the 100-year flood hazard area on the plans.”
  • Short-term rentalsLimited

    Short-term vacation rentals in unincorporated Pierce County.

    • Pierce County Code distinguishes short-term vacation rentals from other lodging accommodations.
    • Vacation-rental regulations are under the residential accessory-use category.
    • The county page states that regulations require submission of an affidavit with Pierce County Planning and Public Works including intent, contact information, and sites where the rental is advertised.
    “Vacation rental regulations are currently under the residential accessory use category, which can be viewed here: Ch. 18A.37 Accessory Development – Residential | Pierce County Code. The regulations require submission of an affidavit with Pierce County Planning and Public Works including intent, contact information, and sites where the rental is advertised.”
    One more reviewed finding on this topic
    • Limited — Short-term vacation rentals in single-family dwellings or accessory dwelling units in unincorporated Pierce County.
      “The regulations require submission of an affidavit with Pierce County Planning and Public Works”
  • Permit feesPublished (with conditions)

    Pierce County construction, land-use, planning, and related permit fees.

    • Construction permit fees include building, plumbing, mechanical, and similar construction-related permits.
    • The applicable fee schedule or reference sheet controls the amount.
    “Construction permit fees [...] are issued by the Building Official.”
    One more reviewed finding on this topic
    • Published (with conditions) — Construction and related permit fees administered by Pierce County.
      “Construction permit fees which include fees for building, plumbing, mechanical, and similar construction related permits are issued by the Building Official.”
  • Permit processPublished (with conditions)

    Pierce County permit application and review process.

    • Applicants research the parcel, gather submittal items, create a site plan, submit the application, and track status.
    • Some projects require Level 1 pre-application screening, including properties served by on-site septic systems or private wells.
    • Incomplete or noncompliant submissions may require follow-up or changes.
    “Steps to help ensure a successful application process:”
    One more reviewed finding on this topic
    • Published (with conditions) — Pierce County permit application and review process.
      “Steps to help ensure a successful application process: Research the Parcel”

Washington rules that apply here

  • Owner-builder exemptionConditional

    An owner or other person performing construction-related contractor activities on the person's own property or personal residence under Washington contractor-registration law.

    • The exemption concerns registration provisions under chapter 18.27 RCW and does not itself eliminate applicable building, electrical, plumbing, mechanical, land-use, or inspection requirements.
    • For work on the person's own property, the exemption does not apply when the person performs contractor activities for the purpose of selling, demolishing, or leasing the property.
    • For an owner contracting with a registered contractor, the exemption does not apply to a person performing contractor activities to lease or sell improved property owned for less than twelve months.

    small-project contract threshold: < 500 USD (The threshold exemption does not apply when the work is part of a larger operation, contracts are divided to evade the chapter, or the person advertises as a contractor.)

    “The registration provisions of this chapter do not apply to: [...] (12) Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
    2 more reviewed findings on this topic
    • Available (with conditions) — Washington contractor-registration exemption for persons working on their own property or personal residence.
      “Any person working on his or her own property, whether occupied by him or her or not”
    • Available (with conditions) — Washington contractor-registration exemption for a person working on their own property or personal residence.
      “Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
  • InspectionsRequired

    Construction or work in Washington for which a permit is required under the applicable state energy-code provisions, including residential construction covered by WAC 51-11R-10500.

    • The requirement is for inspection under the applicable state energy code; the inspection is performed by the code official, designated agent, or approved agency.
    • The work must remain visible and accessible until approved.
    • The permit holder or authorized agent must notify the code official when work is ready and provide access and means for required inspections.
    • If work or an installation fails an initial inspection or test, corrections must be made and the work resubmitted.
    • The state building code is in effect in all counties and cities, subject to chapter 19.27 RCW exceptions and authorized local amendments.

    final inspection: required (The building may not be occupied until approved.)

    “The building shall have a final inspection and not be occupied until approved.”
  • Manufactured homesLimited

    State statutory limits on county regulation of the placement or use of HUD-standard manufactured homes in Washington; site-specific occupancy remains subject to applicable local and state requirements.

    • The nondiscrimination and equal-siting rule applies to homes built to 42 U.S.C. Sec. 5401-5403 standards, as amended in 2000.
    • Except as provided in RCW 36.01.225(2), a county may require that a manufactured home be new.
    • Except as provided in RCW 36.01.225(2), a county may require a permanent foundation specified by the manufacturer and enclosure of the space from the bottom of the home to the ground with concrete or an approved concrete product, load bearing or decorative.
    • Except as provided in RCW 36.01.225(2), a county may require compliance with local design standards applicable to all other homes in the neighborhood.
    • Except as provided in RCW 36.01.225(2), a county may require thermal equivalence to the state energy code and all other requirements for a designated manufactured home under RCW 35.63.160.
    • A county may not restrict location in a manufactured/mobile home community legally in existence before June 12, 2008, based exclusively on the manufactured/mobile home's age or dimensions.
    • A county may not prohibit siting on an existing lot solely because existing separation and setback requirements regulating distance between homes are unmet.
    • A county may restrict location in a manufactured/mobile home community for other reasons, including failure to comply with fire, safety, other local ordinances, or state laws related to manufactured/mobile homes.
    • The statute does not override legally recorded covenants or deed restrictions of record and does not affect authority granted under chapter 43.22 RCW.

    community legal-existence date for age-or-dimensions protection: 2008-06-12 (Applies to manufactured/mobile home communities legally in existence before this date.)

    “A county may not adopt an ordinance that has the effect, directly or indirectly, of discriminating against consumers' choices in the placement or use of a home in such a manner that is not equally applicable to all homes. Homes built to 42 U.S.C. Sec. 5401-5403 standards (as amended in 2000) must be regulated for the purposes of siting in the same manner as site built homes, factory built homes, or homes built to any other state construction or local design standard.”
  • Well permitLimited

    Groundwater wells and groundwater uses statewide under Washington's water-right permit exemption.

    • Domestic use is exempt up to 5,000 gallons per day.
    • Industrial use is exempt up to 5,000 gallons per day.
    • Lawn or garden irrigation is exempt only for a half-acre or less.
    • Stockwater is exempt.
    • Only one permit-exempt use of each type is allowed for any one project, regardless of project size.
    • Withdrawals from multiple wells for one project are aggregated toward the exemption limits.
    • Local governments and other laws and rules may impose additional requirements and limits.
    • Use in excess of the listed amounts, use for other purposes, or use from a surface-water source requires applying for and receiving a water-right permit.
    • Before drilling, a notice of intent must be submitted to Ecology 72 hours before drilling starts; the NOI is not itself a permit or approval to use water.
    • Permit-exempt uses remain subject to state water law, including possible restrictions relating to senior water rights and Streamflow Restoration Act requirements.

    domestic groundwater use exemption: <= 5000 gallons per day (Per project, with withdrawals from multiple wells aggregated.) · industrial groundwater use exemption: <= 5000 gallons per day (Per project, with withdrawals from multiple wells aggregated.) · lawn or garden irrigation exemption: <= 0.5 acre (For lawn or garden irrigation.) · well construction notice: 72 hours before drilling (Notice of intent is not a permit, certificate, or water-right application.)

    “The groundwater permit exemption allows for four small uses of groundwater without a water right permit: Domestic uses of up to 5,000 gallons per day Industrial uses of up to 5,000 gallons per day Irrigation of a lawn or garden, a half-acre or less in size Stockwater”
  • Mandatory utility hookupConditional

    Existing OSS failures and certain new developments statewide when public sewer service and applicable local requirements exist.

    • For an existing OSS failure within a sewer utility service area, the local health officer must require public-sewer connection if the sewer utility allows connection and adequate service is available within 200 feet measured along the usual or most feasible access route.
    • For an OSS repaired under Table X, connection is required when the local health officer deems it necessary to protect public health, adequate public sewer becomes available within 200 feet under the stated measurement rule, and the sewer utility allows connection.
    • Local boards of health may require new development to connect to protect public health.
    • Local boards of health shall require connection for new development or a development with a failing OSS when required by the comprehensive land use plan or development regulations.
    • The rule was filed March 1, 2024, and became effective April 1, 2025.

    public sewer availability distance: <= 200 feet (Measured from the existing building-drain/building-sewer connection, or where no building drain exists, from where the sewer line begins, along the usual or most feasible route of access.)

    “(b) Require connection to a public sewer system if the sewer utility allows the connection and has adequate public sewer services available within 200 feet from where the existing building drain connects to the existing building sewer, or where no building drain exists, within 200 feet from where the sewer line begins, as measured along the usual or most feasible route of access.”
  • Agricultural exemptionAvailable (with conditions)

    Temporary growing structures used solely for production of horticultural plants in Washington.

    • The exemption is limited to temporary growing structures.
    • The structures must be used solely for production of horticultural plants, including ornamental plants, flowers, vegetables, and fruits.
    • The statute states that a temporary growing structure is not considered a building or structure for purposes of chapter 19.27 RCW.
    • This is not a general exemption for residences or all agricultural buildings.
    “The provisions of this chapter do not apply to temporary growing structures used solely for the production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. A temporary growing structure is not considered a building or structure for purposes of this chapter.”
  • Campground & park staysLimited

    Recreational vehicles in the context of Washington's manufactured/mobile-home community statutes

    • The rule defines an RV as temporary and transient living quarters.
    • The RV is not occupied as a primary residence.
    • The RV is not immobilized or permanently affixed to a manufactured/mobile home lot.
    • This claim does not establish general statewide siting permission on private land; local land-use and building rules may apply.
    “(12) "Recreational vehicle" means a travel trailer, motor home, truck camper, or camping trailer that is primarily designed and used as temporary living quarters, is either self-propelled or mounted on or drawn by another vehicle, is transient, is not occupied as a primary residence, and is not immobilized or permanently affixed to a manufactured/mobile home lot.”
    One more reviewed finding on this topic
    • Limited — Camping and temporary occupancy in Washington State Parks facilities
      “The maximum length of stay shall be no more than 10 nights in one park within a 30-day period. Total nights stayed by the same camping party must not exceed 90 nights per calendar year in all state parks. These limitations shall not apply to those individuals who meet the qualifications of WAC 352-32-280 and 352-32-285.”
  • county zoning authorityGeneral

    Washington counties adopting zoning and related official controls for county jurisdiction, including unincorporated areas.

    • A county must create a planning agency as authorized in RCW 36.70.030 and RCW 36.70.040 before engaging in the chapter's planning program.
    • Zoning maps may be adopted only for areas covered by a comprehensive plan containing at least a land use element and a circulation element.
    • Zoning regulations may address land uses, building location and dimensions, yards and open spaces, population density, lot coverage, parking, and minimum gross floor area requirements for single-family detached dwellings.
    • The cited enabling provisions do not state a population threshold, named-county limitation, or special geographic limitation.
    “Any board, by ordinance, may establish classifications, within each of which, specific controls are identified, and which will regulate:”
    One more reviewed finding on this topic
    • General — Washington counties may plan and adopt zoning and other official controls for county land, including unincorporated areas, through their boards and planning agencies.
      “Such official controls may include, but are not limited to, ordinances establishing zoning, subdivision control, platting, and adoption of detailed maps.”
  • county building authorityGeneral

    Washington counties requiring and enforcing building permits and adopting amendments to the state building code for residential construction within county jurisdiction, including unincorporated areas.

    • The state building code must be enforced by counties and cities within their jurisdictional boundaries.
    • A county without a building department must contract with another county, city, or approved inspection agency for enforcement.
    • County amendments may not diminish the minimum performance standards and objectives of the state building code.
    • Residential-building amendments are subject to approval by the state building code council under RCW 19.27.074(1)(b), except as provided by statute.
    • The building-permit definition incorporates exemptions in International Building Code section 105.2 and International Residential Code section R105.2.
    • Counties may adopt permit exemptions for certain specified R-3 or M-1 construction or alteration with total fair market value not exceeding $1,500, but the exemption does not remove substantive code standards.

    permit-exemption fair-market-value ceiling: <= 1500 USD (Applies only to certain construction or alteration of group R, division 3, or group M, division 1 occupancies under RCW 19.27.060(7); substantive code standards still apply.)

    “The state building code required by this chapter shall be enforced by the counties and cities. Any county or city not having a building department shall contract with another county, city, or inspection agency approved by the county or city for enforcement of the state building code within its jurisdictional boundaries.”

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.

Water rights & wells in Pierce County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Washington’s water agency.

Actively managed

This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.

Household wellExempt up to a limit

RCW 90.44.050 exempts up to 5,000 gpd for domestic use, but the 2018 Streamflow Restoration Act caps NEW permit-exempt domestic wells at 3,000 gpd/connection in some basins and 950 gpd (350 gpd indoor in drought) in others, and new post-2020 wells in the adjudicating Nooksack basin are limited to ~500 gpd indoor.

Limit: 5,000 gpd base (RCW 90.44.050); capped to 3,000 or 950 gpd/connection in streamflow-restoration basins; ~500 gpd indoor for new Nooksack wells

Washington Dept of Ecology — Groundwater permit exemption ↗
  • Streamflow Restoration 3,000-gpd basins (RCW 90.94.020)partial of county

    New permit-exempt domestic wells capped at a maximum annual-average 3,000 gpd per connection; larger/new water-right permits generally unavailable due to instream-flow rules.

    Washington Legislature — RCW 90.94.020 ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Washington state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Pierce County, Washington

Is Pierce County a good place to live off-grid or homestead?

Pierce County scores 51/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals. Watch-outs: higher long-term carry cost and about 28,813 people within a 30-minute drive.

Do you need a building permit in Pierce County, Washington?

Pierce County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Tacoma-Pierce County Health Department. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Pierce County?

Living in an RV on your own land in Pierce County is allowed on a temporary basis only: Occupancy of recreational vehicles, travel trailers, or tents in unincorporated Pierce County. A temporary use permit is required. Occupancy is illegal if it exceeds the period allowed by the temporary use permit. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Pierce County, Washington?

Land in Pierce County runs about $28,343 per acre, based on the latest county data.

What is the water situation in Pierce County?

Pierce County gets about 65.4" of rain a year, with severe drought in roughly 4.5% of years. On water rights, Pierce County lies in the Streamflow Restoration 3,000-gpd basins (RCW 90.94.020) — New permit-exempt domestic wells capped at a maximum annual-average 3,000 gpd per connection; larger/new water-right permits generally unavailable due to instream-flow rules..

How remote is Pierce County?

A representative private-land location has about 28,813 people within a 30-minute drive and 4,797,868 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Pierce compares in Washington

Compare side-by-side →See all 39 Washington counties ranked →