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1. How high can I build my fence and/or retaining wall?

The maximum height of a fence is seven feet. The maximum height of a retaining wall is three feet. Maximum combination of a fence and retaining wall is seven feet total but the wall may not exceed three feet. If these criteria are met, then the fence and retaining wall may be placed within the required setbacks. Generally, fences and retaining walls that meet these criteria do not require planning approval and permits are not needed.

2. Do my neighbors need a tree permit to remove a tree? When do they need a permit and what is the process and timeline involved?

The Tree Protection and Preservation Ordinance (Chapter 816-6) defines a protected tree. A tree is either protected or not protected based on its characteristics (e.g. trunk size, species) and the characteristics of the property on which it is located. The Ordinance requires that the property owner obtain a tree permit from the county before trenching, grading or filling within the dripline of any protected tree or before cutting down, destroying, trimming by topping or removal of any protected tree.

3. How do I start a Home Occupation?

A Home Occupation is a business activity that is conducted at a residential dwelling by a person residing in the dwelling and is a secondary and incidental use of the dwelling as a residence. 

No Home Occupation may be conducted at a residential dwelling unless a home occupation permit or a land use permit has been issued. 

More Information about Home Occupations

• View the Home Occupation code to learn more about permitting requirements
• View the Home Occupation How to Guide (PDF)

Home Occupation Application Process

• Apply for a Home Occupation with our ePermit system 
• View the Submitting a Planning Application webpage to learn more about applying for a Planning Application
• Once a Home Occupation permit is obtained, you can get a business license from the Treasurer-Tax Collector's Office-Business License Tax Division on 625 Court Street Martinez, CA 94553. Telephone: 925-957-5280

Home Occupations Code (Municode)

4. What can be built or done to my property?

What type of structures and uses are allowed on individual properties depends on what zoning district the property is located in. If the site is located in the unincorporated area, planning staff can determine the zoning district upon request if you visit the Application & Permit Center or call 925-655-2700 Before visiting or calling, make sure you have the specific Assessor’s Parcel Number (APN), also referred to as the Property Tax Number, or address for the site.

5. Where can I get a copy of the parcel map?

Copies of official parcel maps can be obtained directly from the Assessor’s Office located at 2530 Arnold Drive, Suite 100 in Martinez; for their office hours and current fees call 925-313-7400. Application & Permit Center staff at 30 Muir Road in Martinez can also provide copies of maps from the parcel books created by the Assessor’s Office (fees apply).

Contra Costa County CCMAPs GIS

6. What type of structures do not require a permit?

According to the code the following is exempt from needing permits: One-story detached accessory buildings used as tool and storage sheds, playhouses, and similar uses provided the floor area does not exceed 120 square feet. Unless specifically exempt, anything else will need permits. Any potentially unique situations should be referred to Building Inspection or Planning at 925-655-2700 for a definitive answer.

7. How long does the permit process take?

The length of the permit process depends on the type of application, project, and situation. Generally, the County’s building plan check process takes two to four weeks. Many projects also have to go through local planning application or process as well. Applicants should visit the Application & Permit Center or call 925-655-2700 to discuss their project in more detail.

8. Where can I obtain information on gas, water, or sanitation lines on my property?

First, contact the respective agencies providing services to your area (PG&E, Contra Costa Water District, EBMUD, Central Contra Costa Sanitary District, etc.). Second, consider contacting USA (Underground Services Alert) at 800-227-6000 before beginning any work so that they can mark all lines that lie on your property.

9. What is green building and where can I find more information about green homes?

Green building is a “Whole-Systems” approach for designing and constructing buildings that conserve energy, water, and material resources and are healthier, safer, and more comfortable. Questions regarding green building can be submitted on-line or call (888) 40-GREEN to “Ask an Expert”.

Green Building Resources & Information.

10. When is a permit required from Building Inspection?

A permit is required whenever any structural, plumbing, mechanical or electrical work is to be performed. If you are unsure please feel free to contact us for help at 925-655-2700.