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Thurston County, Washington

The content on the Thurston County website is currently provided in English. We are providing the “Translation” for approximately 10 languages. The goal of the translation is to provide visitors with limited English proficiency to access information on the website in other languages. The translations do not translate all types of documents, and it may not give you an exact translation all the time. The translations are made through an automated process, which may not result in accurate or precise translations, particularly of technical and legal terminology.

Community Planning and Economic Development

After a project is permitted, you schedule inspection 1-3 days before you need it. Schedule in the order listed below. If calling to schedule, use the 3-digit inspection number. Virtual inspections don't require 3-digit number.

Set Up or Cancel Inspections  |    Building & Construction Codes  |  Residential Code Drawings  | Virtual Inspections Fact Sheet

What Inspectors Look For & How to Prepare

Mark all property lines clearly & have paperwork out and visible before inspector arrives. Show inspectors all approved plans, drawings, permits and correction notices. 

Schedule after the erosion control measures are installed, and schedule an inspection even if you use only natural vegetation for erosion control. The erosion control measures must be in place before any clearing, grading, or other ground-disturbing activity starts.

Erosion control means that you have:

  • Silt fence
  • Straw wattle in place
  • 25-ft vegetation strip, and
  • The construction entrance set up so that trucks and other vehicles entering and existing the site do not track dirt, gravel, mud or other site debris onto the road

If you try to schedule and are not allowed, that usually means the inspection took place during the initial review and has already been closed. Inspection done by the Development Review (DevRev) inspectors in the Public Works Department. 

For single-family or two-family residential structures, the building inspector will check to make sure that smoke and CO2 detectors, wood stoves and wood fireplaces are installed correctly at the time of heat pump, stove or final inspection.

For non-residential structures, contact or call 360-628-3409 the fire inspector's line.

Excavation for footings should be complete, and all required reinforcing steel should be in place. Any required forms and all bedding materials for an all-weather wood foundation system should be in place.

Request this inspection after all forms and required reinforcement, foundation vents and access openings are properly installed, but before concrete placement.

The virtual inspections immediately below are part of 111.

Show all parts of the foundation in pictures or video by going around the structure and pointing out each item where the installation detail is different. 

Please use a tape measure to show the following:

  • Anchors are in place, anchor spacing (for Foundation)
  • Clearance to forms
  • Clearance to ground where poured against the ground
  • Distance to the property line
  • Footing size (for Footing)
  • Height of wall (for Foundation)
  • If/Where any manufacturer recommended rebar is provided
  • Laps where required are sufficient length
  • Spacing of verticals and horizontals
  • Venting if this is a crawl space or shown in rim joist on the plans (for Foundation)
  • Wall thickness (for Foundation)
  • Where hold downs are tied in (for Foundation) 
  • Where rebar is tied in and that rebar is the correct size

Show everything:

  • Show wide-angle view of the entire site area showing a landmark so that the site can be identified as the area under construction
  • State the address, site plan, and show where the property line(s) is in relationship to the structure (use a tape if closer than 20 feet to property line(s)
  • Inspection card
  • Approved set of stamped plans
  • Show footing detail from the approved plans
  • Show a chart that refers to the size of the footing and the pole size
  • Identify each post with a letter or number & in the pic/vid state which post it is
  • Show each individual post in clockwise or counter clockwise order and state which order you are moving in
  • Shine a light in the hole to verify concrete sack placement
  • Extend a tape measure down into the hole and show the depth then the width
  • Show the distance between the poles, measure the post size, move to the next hole repeat until done

See example videos: post hole-1 post hole-2

If indicated as necessary on your building permit, request this inspection after all in-slab building service equipment, conduit, piping accessories, insulation, and other ancillary equipment are in place, but before concrete placement.

Please note: this inspection is required only if noted on your building permit. 

Request this inspection when all foam board is in place and sealed.

Strap hold downs will be checked per approved plans. If substituting straps or hold downs, please be sure to have engineer's approval.

Request this inspection after all framing members have been installed in the area where shear wall panels or lateral restraint panels have been specified on the plans.

Required hold-downs and strapping must be in place and all nailing completed.

No covering (installing siding, insulation, wallboard, etc.) may begin until this inspection is done.

All electrical work is regulated by Washington Department of Labor & Industry (LNI), but please have your completed LNI paperwork on hand for us to check. 

Regulated by Washington Dept. of Labor & Industries.

In the Thurston County Municipal Stormwater Permit (NPDES) Boundary area only, see the NPDES map.

This is a second Sedimentation and Erosion Control inspection. Schedule before Framing, Mechanical, and Plumbing inspections.

This inspection is required to ensure compliance with Sediment and Control Best Management Practices (BMPs) during construction. 

Schedule this inspection only after you have reviewed your site and made any repairs/revisions (silt fences, wattles, 25-ft veg. strip, construction entrance, etc.). Inspection done by the Development Review (DevRev) inspectors in the Public Works Department.

Request this inspection after all drain, waste, vent and water supply piping is installed and during water or air pressure testing.


For Minor plumbing installations - 

  • Show copy of plumbing permit & plans
  • Address numbers for the home
  • Overall view of entire work area
  • Each individual plumbing connection
  • Height of vent connections
  • Use level to show required slope
  • Show how plumbing drainage system is isolated from the drainage system to perform pressure test
  • Completed copy of plumbing water/air test self verification form signed by licensed plumber only if virtual inspection

Ready for inspection after all mechanical equipment and ducting (including bath fans), range hood - gas piping if ducted and wood stove chimney(s) are installed and must have ab air pressure test of the gas pipes. 

Heat Pump & Ductless Heat Pump Inspection - VIRTUAL OK.  Show entire installation including location of the required CO2 detector and smoke detectors.

Ready for inspection after the roof, all framing, fire blocking, windows, chimneys, exterior siding and bracing are in place; all plumbing, mechanical and electrical are approved for cover; and energy code caulking and sealing are done.

Request this inspection after all concealed areas (walls, cathedral ceilings, etc.) are insulated, but before covering.

Accessible attics and under-floor areas will be inspected during the Final Inspection.

Request this inspection after all interior and exterior gypsum board is in place, but before plastering is done or gypsum board joints and fasteners are taped and finished.

This inspection is required only if you have fire resistive rated walls. 

Complete the gas line self verification form, and have on hand for us to check or email a picture to


  • code-approved water heater access
  • seismic straps installed per manufacturer’s instructions
  • expansion tank if a backflow preventer is installed
  • pressure and temperature relief valve piped to the exterior terminating 6” above the ground
  • drain pan and outlet routed to an approved location – exterior or floor drain
  • gas combustion air
  • gas ‘B’ vent hookup
  • carbon monoxide detector for gas appliances installed near each bedroom area and each floor level
  • insulation under the water heater in unheated spaces or a concrete floor
  • completed copy of the gas line self verification form
  • Show an overall view of the entire work area,
  • Provide any other information requested on the permit,
  • Show and note all these distances: 
    • Tank to vehicular way or protection from vehicles,
    • Tank to structures,
    • Tank to other tanks,
    • To combustible materials.
  • Show all these above-ground parts:
    • Support pad,
    • Support for tank.
  • Show all these below-grade parts: 
    • Depth below grade,
    • Cathodic protection,
    • Regulator vent,
    • Cathodic testing report,
    • Backfill material. 


This inspection can be done during the Mechanical Rough-In Inspection 136 (see above).

Show copy of the corrections list & the corrected item.

Please use this final inspection checklist (PDF) to prepare for final.

Before scheduling any final inspection, these things must be complete:  

  • Make sure all septic drawings are reviewed and approved. See Record Drawing in final inspection checklist above.
  • Make sure all critical area / environmental inspections are complete- Review the white copy of your permit to see if this is a required part of your permit before scheduling. 

After all electrical trim & appliances are installed, call the Washington State Department of Labor and Industries at (360) 902-5242 to schedule.

Final Access Inspection (420)

  • This is an inspection of the paved driveway approach (also called apron). This inspection must be scheduled before the 476 inspection. 


Final Development Review Inspection (476) 

  • Complete all drainage system and soil amendments. Schedule this before Final building inspection. Must be inspected within three  days of the scheduled inspection date.

Request this inspection after the grading is done, the septic as-built drawing is approved, and the home is ready for occupancy.

The address that is clearly legible from the road should be posted.

Carpeting, painting, interior doors, finish work are not regulated and don't have to be done before you schedule.

After reviewing the final inspection checklist (PDF), call to schedule. 

When all required inspections have been completed and approved, you will receive a Certificate of Occupancy. Your new home is now ready for occupancy. Ask the building inspector approving the final inspection of your home to give you the County copy of your approved Building Plans. Please keep these plans, your Certificate of Final Inspection, your permit card and other permit and construction documents in a safe place for future reference. If you decide to remodel or build an addition onto your home, these documents will serve as a record of what was constructed on your site and as a useful reference for your designer or builder. 

Inspectors check footing/runners, blocking/tie-downs, skirting and conduct a final inspection. Details in Manufactured Home Inspection checklist  & Manufactured Home Landing Detail drawing.