Construction Inspection


Building DivisionBuilding Permits, Inspections & Code Enforcement

Building Plan Review

Building & Construction Inspection

About Us:

The Construction Inspection Unit is responsible for on-site inspections to ensure a building is constructed according to the approved plans and code requirements.

Scheduling Inspections:

It is the duty of the permit holder to request inspections from the Building Official and provide access to and means for inspection of the construction work (109.5 CBC 2007 ED).

Inspections can be scheduled by calling (707) 253-4416 between 8:00 AM and 2:00 PM. Inspections are scheduled on a first come first served basis for the next available time. The inspection request message will advise you which day is available. If you need to confirm your inspection or get an estimated time, please call (707) 253-4417 on the morning of your scheduled inspection, between 7:45 AM and 8:30 PM, and speak to the inspector assigned to your area. It is very important that you schedule your inspections according to the Description and the Inspection Number, listed on your Inspection Card. Failure to leave the correct information will delay the scheduling of your project.


A Re-Inspection Fee may be assessed for each re-inspection when work for that inspection is not complete, or when corrections called for are not made (Section 108.5 CBC 2007 ED).

Final Inspection:

It is the permit holder’s responsibility to ensure that your project has undergone an approved final inspection by all necessary Departments before requesting a Final Building Inspection. The Building Division will not issue a Permit Final until all other required Departments have finaled your permit. Please call our office 48 hours after your Final Building Inspection to confirm that your permit has been finalized in our records.

Posting Your Permit:

The issued Building Permit must be posted on the job site. Approved Plans must be kept at the job site at all times until the project is completed. No change or deviation from the Approved Plans can be made without prior approval from the Building Official (105.7 CBC 2007 ED). You must comply with any and all laws and ordinances pertaining to your construction activity.

Changes In Work:

Any deviation from the Approved Plans must first be approved by the Building Official. You will be required to submit drawings and engineering, if necessary, for all desired revisions along with a Permit Alteration Application to the building office before the changes are made in the field. Depending on the scope of your revision, you may also need approval from other County Departments and/or government agencies. Requested changes may also prevent you from continuing with construction until approval has been granted. The time frame for approval will vary depending on current workload and the degree of review necessary for your revision. Be advised that your change could result in a delay of several weeks. Changes that are deemed beyond the scope of work under the original permit will require a new permit (Section 106.4 CBC 2007 ED).

Permit Expiration:

Every permit issued by the Building Official is subject to expiration under the provisions of State and/or County code. Issued permits shall expire by limitation and become invalid if the work authorized is not commenced within one year from the date of permit issuance, or if the building or work authorized by such permit is suspended or abandoned at any time after the work is commenced for a period of 180 days, or if an approved inspection has not been scheduled and performed for a period of 180 days.

You may request a permit extension in writing prior to your permit expiration. Address your letter to the Building Official and provide a reason for the extension request. Extensions are granted for a period up to 180 days at the discretion of the Building Official. No request will be accepted more than 30 days prior to the expiration date (Section 105.5 CBC 2007 ED; Napa County Amended).

Inspection Timing:

No work shall be done on any part of the building or structure beyond the point indicated in each successive inspection without first obtaining the approval of the Building Official. Such approval will be given only after inspection is made of each successive step in the construction process. After receiving your permit, the following inspections must be called for and approved by the inspector before concealing any work requiring additional inspection:

  • Foundation Inspection - To be made after trenches are excavated, forms erected, and steel is in place but before concrete is placed. Setbacks from property lines will be checked at this time; however the proper position of the building is the responsibility of the permit holder. Reinforcing steel or structural framework of any part of any building or structure shall not be covered or concealed without first obtaining the approval of the Building Official.
  • Concrete Slab or Under-floor Inspection - To be made after all under-slab or underfloor building service equipment, conduit, piping accessories and other ancillary equipment items are in place, but before any concrete is poured or floor sheathing installed, including the subfloor. Solid, waste, water, and gas piping must be strapped and under test.
  • Roof Inspections
    • Tear-off/Sheathing/Deck-nailing – To verify proper nailing and condition of roof decking before any roofing material is applied.
    • In-progress – To verify installation per manufacturer specifications.
    • Final – To verify that roof is completed

  • Rough Plumbing Inspection - To be made when framing is complete and before any interior covering is in place. All plumbing vents shall be completed and under test. A separate inspection for the trap and overflow for tub/shower shall be required.
  • Electrical Inspection - To be made when framing is complete and before any interior covering or insulation is in place and all rough electrical wiring is completed.
  • Structural Frame Inspection - To be made after roof sheathing, all framing, fire blocking, bracing and draft stopping are in place; chimneys, vents, ducts, top-out plumbing and rough wiring are complete, but before building is insulated. A separate lateral bracing inspection may be required prior to installation of exterior siding or lathing.
  • Insulation Inspection - To be made before interior lathe, gypsum board or exterior lathe is applied.
  • Lath and/or Wallboard - To be made after all lathing and/or wallboard, interior and exterior, or gypsum board is in place but before plaster, stucco or taping is applied.
Final Inspection:

Final Inspection will not be made until the building/construction is complete, the final grade sloped away from building for drainage and driveway, approach, septic tank, and planning and zoning requirements have been completed and approved by the respective County Departments, and before the building is occupied. The building must be unlocked or some arrangements made for a key for use by the inspector. An air pressure test on gas piping shall be made with a minimum of 10lbs per square inch showing on air gauge. All electrical fixtures, convenience outlets, switches and plates shall be in place. A completed insulation certificate and applicable energy forms and any special inspection summaries must be submitted to the building inspector.