On this page 6
§ 02
When a permit is required
Permit triggers and exempt work for Clayton
Clayton states most building, demolition, and home improvement projects require a permit, including pools, spas, accessory structures, additions and alterations, decks, gazebos, arbors, kitchen and bath remodels, patios, doors and windows, electrical work, reroofs, new residential and commercial buildings, signs, tenant improvements, and replacement water heaters, furnaces, and air conditioners. County guidance also says almost all projects involving new structures, demolitions, additions, remodels, utilities, decks, garages, pools, ADUs, solar, storage systems, and generators require plans and permit review.
One-story detached accessory structures not exceeding 120 square feet, subject to planning/sanitary/environmental caveats
Fences not over 7 feet high
Retaining walls not more than 3 feet high, measured from top of footing to top of wall, if not supporting surcharge or excessive slope conditions
Ordinary finish work such as painting, papering, tiling, carpeting, cabinets, countertops, and similar work
Temporary motion picture, television, and theater stage sets and scenery
Certain above-ground prefabricated pools accessory to Group R-3 occupancy that are less than 24 inches deep and not greater than 5,000 gallons
Swings and other playground equipment accessory to detached one- and two-family dwellings
Certain window awnings in Group R-3 and U occupancies
Nonfixed and movable fixtures, cases, racks, counters, and partitions not over 5 feet 9 inches high
Detached decks for R-3 and U occupancies not exceeding 200 square feet, not more than 30 inches above grade, not attached to the dwelling, and not serving the required exit door
- Exempt One-story detached accessory structures not exceeding 120 square feet, subject to planning/sanitary/environmental caveats
- Exempt Fences not over 7 feet high
- Exempt Retaining walls not more than 3 feet high, measured from top of footing to top of wall, if not supporting surcharge or excessive slope conditions
- Exempt Ordinary finish work such as painting, papering, tiling, carpeting, cabinets, countertops, and similar work
- Exempt Temporary motion picture, television, and theater stage sets and scenery
- Exempt Certain above-ground prefabricated pools accessory to Group R-3 occupancy that are less than 24 inches deep and not greater than 5,000 gallons
- Exempt Swings and other playground equipment accessory to detached one- and two-family dwellings
- Exempt Certain window awnings in Group R-3 and U occupancies
- Exempt Nonfixed and movable fixtures, cases, racks, counters, and partitions not over 5 feet 9 inches high
- Exempt Detached decks for R-3 and U occupancies not exceeding 200 square feet, not more than 30 inches above grade, not attached to the dwelling, and not serving the required exit door
Note: Exemptions do not override zoning, floodplain, stormwater, environmental health, or other agency approvals. Electrical, plumbing, and mechanical work can still require permits even if the structure itself is otherwise exempt.
Required documents
- Typically includes a completed application, plan set, project scope, property address, current code cycle on plans, structural details, Title 24 energy documents as applicable, and supporting reports such as soils/geotechnical, drainage, CalGreen debris compliance, and other agency approvals when triggered.
- Building code
- Contra Costa County's current building code summary, updated January 2, 2026, lists the 2025 California Building Standards Code set as current, effective January 1, 2026, plus Contra Costa County Code Title VII and applicable city ordinances depending on the city where the property is located. Clayton's building page confirms county enforcement in Clayton for the California Building, Electrical, Mechanical, Plumbing, and Green Building Standards Codes.
- Permit validity
- County plan-check applications are deemed abandoned after 180 days if not pursued in good faith or issued. Issued building permits expire 365 days from issue if no required inspection is approved, or if 365 days pass between approved inspections. Extension requests must be submitted 30 days before expiration.
- Owner-builder
- Owner-builders may apply for permits on their own property and may need proof of ownership. If an authorized agent applies for an owner-builder permit, the county requires an Authorization of Agent form before issuance.
- Contractor requirements
- County permits can be issued to licensed contractors, property owners, or authorized agents. Contractors must connect their CSLB license to the county ePermits account. For Clayton projects, contractors also need a current Clayton business license before the county will issue the permit. For commercial jobs other than single-family residences, the county states permits will only be issued to the licensed contractor doing the work.
§ 03
Application process
Typical processing: County initial review about 4 to 5 business days; full plan review and issuance timeline varies by scope and completeness.
- 01 Contact Clayton Community Development early to confirm zoning and local requirements before preparing the full package.
- 02 Prepare plans and supporting documents. Clayton says applications generally need construction plans, structural engineering, energy design calculations, and soils reports as applicable; the county also expects plan sets and often architectural, structural, electrical, mechanical, plumbing, and Title 24 documents depending on scope.
- 03 For most Clayton projects, submit the completed building permit application and plan set to Clayton at City Hall or by email. Clayton reviews for zoning compliance, engineering review if required, stormwater permit requirements, construction and demolition debris recycling requirements, and verification of a current Clayton business license for contractors.
- 04 If the project affects sanitary sewer service or otherwise needs outside utility review, obtain any required City of Concord review and sewer-related approvals.
- 05 Submit to Contra Costa County for construction plan check, fee payment, permit issuance, and inspections. For permit types eligible for county ePermits direct processing, Clayton notes residential rooftop solar, plumbing, and mechanical permits may proceed through the county system after city-side requirements are satisfied.
- 06 County initial completeness review takes about 4 to 5 business days. Total issuance time depends on project scope, completeness, and whether plan corrections are required; the county does not publish a single standard turnaround for all building permits.
- 07 After issuance, schedule required inspections with Contra Costa County and obtain final approval before closing out the permit.
Typical processing time: County initial review about 4 to 5 business days; full plan review and issuance timeline varies by scope and completeness.
§ 04
Fee schedule
Clayton building permit fees
Fee type
Amount
01
Minimum permit fee
The county fee schedule is valuation-based. For building permits, the construction inspection schedule starts at $75 for projects up to $2,000 improvement value, and plan review starts at $49 for projects up to $2,000 improvement value. Some trade permits also expressly state a $75 minimum.
02
Plan check fee
County fee schedule Section S-001A Plan Review is valuation-based, starting at $49 plus $8.94 per additional $1,000 or fraction above $2,000, with graduated tiers thereafter.
03
Permit fee formula
Valuation-based for core building permit review, processing, plan review, inspection, energy compliance, and access compliance, with separate flat or hourly fees for some specialized services and revisions.
04
Reinspection fee
County fee schedule lists reinspection charges of $150 per trip in cited situations; the SolarAPP+ page also warns of a $150 reinspection fee if required inspection documents are missing or the system is not installed per plans.
05
Penalty (no permit)
Expired permit renewal fees also apply.
Online payments go through the county ePermits Center. The county's current permit payments page says credit cards incur a 2.75% convenience fee with a $1 minimum, and e-checks incur a $2.50 convenience fee. The county states the convenience fee is charged by its third-party processor and appears as a separate charge.
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- (925) 646-4108 (phone)
- https://epermits.cccounty.us (online)
- https://aca-prod.accela.com/CCC (online)
- Scheduling deadline
- Same-day inspection requests by phone are accepted until 5:30 AM Monday through Friday.
- Inspection hours
- Same-day inspection requests by phone are accepted until 5:30 AM Monday through Friday. The county posts the current business day's inspection schedule after 8:45 AM, with 3-hour inspection windows. Online cancellations and reschedules are allowed before 6:00 AM on the day of inspection.
- Time windows
- Same-day inspection requests by phone are accepted until 5:30 AM Monday through Friday. The county posts the current business day's inspection schedule after 8:45 AM, with 3-hour inspection windows. Online cancellations and reschedules are allowed before 6:00 AM on the day of inspection.
Typical sequence: Typical sequence depends on project scope. County inspection references include foundation inspections and final inspection, and projects proceed through the required trade/building inspections shown on the permit record before final approval. For qualifying SolarAPP+ permits, the county specifically directs scheduling the `120 Building-Final` inspection. Reinspection note: To avoid reinspection fees, the county requires the permit, reviewed/stamped plans, site access, corrected prior deficiencies, work readiness, and an adult representative onsite. Reinspection fees are published at $150 in the county fee materials and SolarAPP+ guidance.
§ 06
Frequently asked
Common questions about Clayton permits
01 Do I need a building permit in Clayton, CA? ▸
Clayton states most building, demolition, and home improvement projects require a permit, including pools, spas, accessory structures, additions and alterations, decks, gazebos, arbors, kitchen and bath remodels, patios, doors and windows, electrical work, reroofs, new residential and commercial buildings, signs, tenant improvements, and replacement water heaters, furnaces, and air conditioners. County guidance also says almost all projects involving new structures, demolitions, additions, remodels, utilities, decks, garages, pools, ADUs, solar, storage systems, and generators require plans and permit review.
02 How much does a building permit cost in Clayton, CA? ▸
Building permit fees in Clayton, CA are set by the local building department and vary by project type and valuation. The minimum permit fee is The county fee schedule is valuation-based. For building permits, the construction inspection schedule starts at $75 for projects up to $2,000 improvement value, and plan review starts at $49 for projects up to $2,000 improvement value. Some trade permits also expressly state a $75 minimum.. Fees are calculated as: Valuation-based for core building permit review, processing, plan review, inspection, energy compliance, and access compliance, with separate flat or hourly fees for some specialized services and revisions.. Plan check fee: County fee schedule Section S-001A Plan Review is valuation-based, starting at $49 plus $8.94 per additional $1,000 or fraction above $2,000, with graduated tiers thereafter..
03 How do I apply for a building permit in Clayton, CA? ▸
To apply for a building permit in Clayton, CA, follow these steps: 1. Contact Clayton Community Development early to confirm zoning and local requirements before preparing the full package. 2. Prepare plans and supporting documents. Clayton says applications generally need construction plans, structural engineering, energy design calculations, and soils reports as applicable; the county also expects plan sets and often architectural, structural, electrical, mechanical, plumbing, and Title 24 documents depending on scope. 3. For most Clayton projects, submit the completed building permit application and plan set to Clayton at City Hall or by email. Clayton reviews for zoning compliance, engineering review if required, stormwater permit requirements, construction and demolition debris recycling requirements, and verification of a current Clayton business license for contractors. 4. If the project affects sanitary sewer service or otherwise needs outside utility review, obtain any required City of Concord review and sewer-related approvals. 5. Submit to Contra Costa County for construction plan check, fee payment, permit issuance, and inspections. For permit types eligible for county ePermits direct processing, Clayton notes residential rooftop solar, plumbing, and mechanical permits may proceed through the county system after city-side requirements are satisfied. 6. County initial completeness review takes about 4 to 5 business days. Total issuance time depends on project scope, completeness, and whether plan corrections are required; the county does not publish a single standard turnaround for all building permits. 7. After issuance, schedule required inspections with Contra Costa County and obtain final approval before closing out the permit.
04 How long does it take to get a building permit in Clayton, CA? ▸
Building permit processing times in Clayton, CA typically run County initial review about 4 to 5 business days; full plan review and issuance timeline varies by scope and completeness.. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in Clayton, CA? ▸
Not all construction work requires a permit in Clayton, CA. The following work is generally exempt: One-story detached accessory structures not exceeding 120 square feet, subject to planning/sanitary/environmental caveats; Fences not over 7 feet high; Retaining walls not more than 3 feet high, measured from top of footing to top of wall, if not supporting surcharge or excessive slope conditions; Ordinary finish work such as painting, papering, tiling, carpeting, cabinets, countertops, and similar work; Temporary motion picture, television, and theater stage sets and scenery; Certain above-ground prefabricated pools accessory to Group R-3 occupancy that are less than 24 inches deep and not greater than 5,000 gallons; Swings and other playground equipment accessory to detached one- and two-family dwellings; Certain window awnings in Group R-3 and U occupancies; Nonfixed and movable fixtures, cases, racks, counters, and partitions not over 5 feet 9 inches high; Detached decks for R-3 and U occupancies not exceeding 200 square feet, not more than 30 inches above grade, not attached to the dwelling, and not serving the required exit door. Note: Exemptions do not override zoning, floodplain, stormwater, environmental health, or other agency approvals. Electrical, plumbing, and mechanical work can still require permits even if the structure itself is otherwise exempt. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in Clayton, CA? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in Clayton, CA via: (925) 646-4108, https://epermits.cccounty.us, https://aca-prod.accela.com/CCC. Same-day inspection requests by phone are accepted until 5:30 AM Monday through Friday..
last verified April 2026
source City of Clayton Community Development Department; Contra Costa County Department of Conservation and Development, Building Inspection Division ↗
entry id permits/california/contra-costa/clayton
Educational reference. Permit rules and fees change — confirm current requirements directly with City of Clayton Community Development Department; Contra Costa County Department of Conservation and Development, Building Inspection Division before applying. Jaspector is not legal advice.