California / Contra Costa County
Shed Permit in Contra Costa County, California
It depends
Sometimes, depending on the project
Before building a detached shed or other one-story detached accessory structure whose floor area exceeds 120 square feet, and for any electrical, plumbing, or mechanical work run to a shed of any size.
Issued byContra Costa County Department of Conservation and Development, Building Inspection Division
By Mario Bailey, verified against official sources
Quick answer
Contra Costa County follows the California Residential Code exemption for one-story detached accessory structures of 120 square feet or less, so a small detached shed does not need a building permit. The county attaches two express conditions to that exemption on its own handout: approval from the Planning Division, the Sanitary District, or Contra Costa County Environmental Health may still be required depending on where the structure sits, and any electrical, plumbing, and mechanical work requires a permit. Anything above 120 square feet is permitted under the county's general rule in Ordinance 72-6.202 that no one may erect or construct any regulated structure without first obtaining permits from the county building official.
Typical threshold: floor area of a one-story detached accessory structure.
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When a permit is usually needed
Before building a detached shed or other one-story detached accessory structure whose floor area exceeds 120 square feet, and for any electrical, plumbing, or mechanical work run to a shed of any size.
What a shed permit costs in Contra Costa County
How Contra Costa County compares in California
| Jurisdiction | Permit needed? | Threshold |
|---|---|---|
| Alameda County | It depends | Floor area of a one-story detached tool or storage shed accessory to a house, at which the building permit exemption stops |
| Contra Costa Countythis page | It depends | floor area of a one-story detached accessory structure |
| Fresno County | It depends | One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses are exempt from a building permit when the floor area is not greater than 120 square feet |
| Los Angeles | It depends | one-story shed under 120 sq ft and under 12 ft in height with no electrical or plumbing does not require a permit |
| Los Angeles County | It depends | gross floor area of a one-story detached accessory building; the exemption also requires the height not to exceed 12 feet and the maximum roof projection not to exceed 24 inches |
| Orange County | It depends | One-story detached accessory buildings used as tool and storage sheds, play houses and similar uses are exempt from a building permit only when the floor area does not exceed 120 square feet and the structure sits at least 3 feet from the property line and 6 feet from other buildings on the same property |
| Riverside County | It depends | A one-story detached accessory structure with a floor area of 120 square feet or less is exempt from a building permit, other than a storm shelter |
Closest shed permit thresholds outside California
Jurisdictions we cover whose limit sits nearest Contra Costa County's 120 sq ft.
- Aurora, Colorado, shed floor area at which a building permit is required
- Baltimore County, Maryland, accessory structure floor area
- Boston, Massachusetts, one-story detached accessory sheds used for tools or storage are exempt if floor area does not exceed 120 sq ft
- Chandler, Arizona, One-story detached accessory structures (storage sheds, open-air ramadas) with floor area of 120 sq ft or less and height of 7 ft or less (up to 9 ft with 2 additional feet of setback per additional foot of height) are exempt if not connected to any electrical, gas, or water utility; exceeding either limit or connecting a utility requires a building permit.
How to apply in Contra Costa County
In Contra Costa County, a residential shed permit application, once the shed is large enough to require one, is a set of construction documents that show what will be built and prove it meets the adopted residential code. In practice that means a written permit application, a scaled site plan locating the shed and its distances to the property lines, and construction documents covering the shed's foundation or anchoring system and its framing.
What most shed permit applications include:
- For Contra Costa County, a written permit application identifying the proposed work and describing the property by its address or legal description, filed with the building department before construction begins (IRC R105.3).
- For Contra Costa County, a scaled site plan showing the shed's size and location and its dimensioned distances to all property lines so required setbacks can be verified before the permit is issued (IRC R106.2).
- Construction documents showing the shed's foundation: freestanding accessory structures at or under the code's small-structure size and eave-height limits (600 square feet and a 10 foot eave height in the model code) are exempt from continuous footings but must still be shown supported on undisturbed soil or engineered fill and anchored to resist wind-induced uplift and overturning (IRC R403.1).
- Where the shed does sit on a continuous foundation with a wood sill plate, anchor bolt or approved strap details tying the sill plate to the foundation (IRC R403.1.6).
- Roof framing details showing the rafter-to-wall or truss-to-wall connections, since even a shed exempt from continuous footings must be anchored to resist wind-induced uplift and overturning (IRC R403.1; R802.11).
General submittal guidance from IRC R105.3 (permit application), R106.2 (site plan), R403.1 (footings and anchorage for accessory structures), and R403.1.6 (sill anchorage), 2021 IRC. Source. Contra Costa County Department of Conservation and Development, Building Inspection Division sets the exact checklist for Contra Costa County.
Where to apply in Contra Costa County:
Contra Costa County Department of Conservation and Development, Building Inspection Division
- Application and Permit Center, 30 Muir Road, Martinez, CA 94553
- Phone: 925-655-2700
- Email: permits@dcd.cccounty.us
Shed Permit in Contra Costa County compared with nearby California localities
| Locality | Permit needed? | Threshold | What each California schedule says | Verified |
|---|---|---|---|---|
| Contra Costa County | It depends | floor area of a one-story detached accessory structure | No shed-specific flat fee is published | |
| Alameda County | It depends | Floor area of a one-story detached tool or storage shed accessory to a house, at which the building permit exemption stops | ...and the Schedule B square-foot valuation table, with a stated minimum of '$140.00... | |
| Fresno County | It depends | One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses are exempt from a building permit when the floor area is not greater than 120 square feet | ...application, not a building permit: 'The cost for the permit will be $153.44 (a... | |
| Los Angeles | It depends | one-story shed under 120 sq ft and under 12 ft in height with no electrical or plumbing does not require a permit | No shed-specific valuation multiplier printed | |
| Los Angeles County | It depends | gross floor area of a one-story detached accessory building; the exemption also requires the height not to exceed 12 feet and the maximum roof projection not to exceed 24 inches | ...exemption is priced from the valuation-based Table 1-A Building Permit Fees ($65.36... |
Inspections and closing out your permit
In Contra Costa County, a permitted shed is inspected in stages as it goes up: the foundation or the anchors that hold it down before they are covered, the framing before it is enclosed, and a final inspection once the shed is finished. Each stage checks the items that would be hidden or unsafe if skipped.
- Foundation or anchor inspection in Contra Costa County: called after any required footings, piers, or ground anchors are set and any forms or reinforcing steel are in place, but before concrete is placed, so the foundation or anchoring system can be verified before it is covered (IRC R109.1.1).
- Frame inspection in Contra Costa County: after the shed is framed, sheathed, and braced, the inspector checks the framing, bracing, fasteners, and the roof connections that resist wind uplift, before those elements are covered (IRC R109.1.4 frame inspection; R403.1 anchorage).
- Final inspection in Contra Costa County: made after the permitted work is complete and before the shed is used; work may not proceed past any inspection stage without the building official's approval (IRC R109.1.6 final inspection; R109.4 approval required).
- In Contra Costa County: for a pre-fabricated or kit shed, the manufacturer's installation instructions must be on site at the time of inspection so the inspector can confirm the anchoring and assembly match the design (IRC R106.1.2).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Contra Costa County permit portal or by phone at 925-655-2700.
Inspection sequence from IRC R109.1.1 (foundation inspection), R109.1.4 (frame inspection), R109.1.6 (final inspection), and R106.1.2 (manufacturer's instructions on site), 2021 IRC. Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Shed Permit checklist for Contra Costa County
- Confirm the requirement. Sometimes, depending on the project. Typical threshold: floor area of a one-story detached accessory structure. Usually needed: Before building a detached shed or other one-story detached accessory structure whose floor area exceeds 120 square feet, and for any electrical, plumbing, or mechanical work run to a shed of any size.
- Budget the fee. No shed-specific flat fee is published. Sheds fall under the valuation-based building fees in the Land Development Fee Schedule: S-001 Plan Review starts at $49.00 for improvement value up to $2,000 plus $8.94 for each additional $1,000, S-001 Permit Review and Processing starts at $19.00 plus $3.44 for each additional $1,000, and S-002 Building Permit inspection starts at $75.00 plus $13.75 for each additional $1,000. The county states a "$75.00 minimum fee on all charges." Fee schedule adopted May 24, 2022, effective August 10, 2022. Official fee schedule.
- Apply. In Contra Costa County, a residential shed permit application, once the shed is large enough to require one, is a set of construction documents that show what will be built and prove it meets the adopted residential code. In practice that means a written permit application, a scaled site plan locating the shed and its distances to the property lines, and construction documents covering the shed's foundation or anchoring system and its framing. Start at the Contra Costa County permit portal.
- Keep the office details handy. Contra Costa County Department of Conservation and Development, Building Inspection Division. Phone: 925-655-2700. Address: Application and Permit Center, 30 Muir Road, Martinez, CA 94553.
- Plan for inspections. In Contra Costa County, a permitted shed is inspected in stages as it goes up: the foundation or the anchors that hold it down before they are covered, the framing before it is enclosed, and a final inspection once the shed is finished. Each stage checks the items that would be hidden or unsafe if skipped.
Compiled from the official sources on this page. Last checked .
Frequently asked questions
- Do you need a shed permit in Contra Costa County?
- Contra Costa County follows the California Residential Code exemption for one-story detached accessory structures of 120 square feet or less, so a small detached shed does not need a building permit. The county attaches two express conditions to that exemption on its own handout: approval from the Planning Division, the Sanitary District, or Contra Costa County Environmental Health may still be required depending on where the structure sits, and any electrical, plumbing, and mechanical work requires a permit. Anything above 120 square feet is permitted under the county's general rule in Ordinance 72-6.202 that no one may erect or construct any regulated structure without first obtaining permits from the county building official. Floor area of a one-story detached accessory structure. Always confirm with the office before starting.
- How much does a shed permit cost in Contra Costa County?
- No shed-specific flat fee is published. Sheds fall under the valuation-based building fees in the Land Development Fee Schedule: S-001 Plan Review starts at $49.00 for improvement value up to $2,000 plus $8.94 for each additional $1,000, S-001 Permit Review and Processing starts at $19.00 plus $3.44 for each additional $1,000, and S-002 Building Permit inspection starts at $75.00 plus $13.75 for each additional $1,000. The county states a "$75.00 minimum fee on all charges." Fee schedule adopted May 24, 2022, effective August 10, 2022. See the official fee schedule for current amounts.
- Where do you apply for a shed permit in Contra Costa County?
- You can apply through the Contra Costa County permit portal or contact the Contra Costa County Department of Conservation and Development, Building Inspection Division directly. The links are listed on this page.
- Can a homeowner pull a shed permit themselves in Contra Costa County?
- Under California law (Business & Professions Code 7044(a)-(b); Business & Professions Code 7031.5): California exempts an owner from contractor licensing under section 7044 when they personally perform all the work on their own property, or any work they do not perform themselves is done by their own employees paid only wages, and none of the improvements are intended or offered for sale. It also exempts an owner who directly contracts with licensed contractors for each trade, as long as no more than four of the single-family residential structures involved are intended or offered for sale in a calendar year; this route does not apply if the owner instead contracts with a general contractor for the construction. A homeowner may also improve their own principal residence without a license, as long as the work is done before any sale, they have actually resided there for the 12 months before completion, and they have not used this exemption on more than two structures more than once in any three-year period. Selling a self-built structure within one year of completion creates a rebuttable presumption that it was built for sale, which defeats the exemption, and selling five or more structures within a year makes that presumption conclusive. Separately, every city or county that requires a permit must also require the applicant to file a signed statement giving their contractor license number or the basis of their claimed exemption; a false or missing statement carries a civil penalty of up to $500. Confirm how Contra Costa County applies this before you apply.
From the Library
What else needs a permit in Contra Costa County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Deck Permit | It depends | area of a deck that is also no more than 30 inches above grade at any point, is not attached to a dwelling, and does not serve a code-required exit door | No deck-specific flat fee is published |
| Electrical Permit | Permit required | Any size | Land Development Fee Schedule S-002 C.6, "Electrical Permit (Other) $75.00 minimum."... |
| Fence Permit | It depends | height of a fence, with concrete and masonry walls treated as walls rather than fences | ..."Fences Greater than 7ft": Building Permit / Inspection, chain-link or wood $116.00... |
| HVAC Permit | Permit required | Any size | Land Development Fee Schedule S-002 D.6, "Mechanical Permit (Other) $75.00 minimum."... |
| Patio Permit | It depends | roof area of a trellis, arbor, or pergola accessory to a residence, treated by the county as a one-story detached accessory structure | ...cover (includes pre-fab types, usually with ICBO research listing)" at $25.73 per... |
| Plumbing Permit | Permit required | Any size | Land Development Fee Schedule S-002 E.6, "Plumbing Permit (Other) $75.00 minimum."... |
| Pool Permit | It depends | depth of a prefabricated pool accessory to a one or two family dwelling that is installed entirely above ground and holds no more than 5,000 gallons | The Building Valuation Data Supplement sets a "Swimming pool, lump sum of: $39,514.98"... |
| Roof Replacement Permit | Permit required | Any size | ...Schedule item 14, "Re-Roofs - Residential": Building Permit / Inspection $150.00... |
| Solar Permit | Permit required | Any size | ...mount," photovoltaic systems 15 kW or less: Building Permit/inspection $86.00 per... |
Shed Permit in other California localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not Contra Costa County documents; the office above sets the local rules.
- IRC R105.3 (permit application), R106.2 (site plan), R403.1 (footings and anchorage for accessory structures), and R403.1.6 (sill anchorage), 2021 IRC
- IRC R109.1.1 (foundation inspection), R109.1.4 (frame inspection), R109.1.6 (final inspection), and R106.1.2 (manufacturer's instructions on site), 2021 IRC
How this shed permit page for Contra Costa County was verified. 2 official sources: contracosta.ca.gov, contracosta.ca.gov; fee schedule: official document. Last checked by Mario Bailey, not confirmed with Contra Costa County Department of Conservation and Development, Building Inspection Division. Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page
Compare Shed Permit requirements across California localities