Contra Costa County · Zoning · T-1
Contra Costa County T-1 zoning: height, setbacks and lot size
In Contra Costa County's T-1 zone, generally buildings can be up to 20 ft tall, the front setback is 20 ft and the minimum lot size is 2,500 sq ft, with the conditions listed below (Contra Costa County code, read October 2026).
Key points
- Maximum building height: 20 ft (Any mobile home or other structure in a T-1 subdivision)
- Minimum front setback: 20 ft (Park boundary along the public street upon which the park abuts)
- Minimum side setback: 10 ft (Along each side boundary of the park)
- Minimum rear setback: 10 ft (Along the rear boundary line of the park)
- Minimum lot size: 2,500 sq ft (Lots in a mobile home park)
T-1 (Mobile Home/Manufactured Home Park District) is a zoning district in Contra Costa County. Every value below was read from the Contra Costa County Municipal Code and links to its section (read October 2026). State laws such as the ADU and SB 9 rules can allow more on a residential lot. General information, not legal advice — read the code text and check with the city before you build.
Development standards in T-1
The general rule for a typical lot in this zone. Zoning tables often attach notes, such as rules for corner lots, lots next to a residential zone, or new subdivisions only. Open “code text” under a value to see the table cell or sentence it was read from.
| Maximum building height | 20 ft Applies: Any mobile home or other structure in a T-1 subdivision § 84-68.1310 · code textNo mobile home or other structure in a T-1 subdivision shall exceed twenty feet in height. |
|---|---|
| Minimum front setback | 20 ft Applies: Park boundary along the public street upon which the park abuts § 84-68.1210 · code textA front yard of at least twenty feet along the public street upon which the park abuts shall be provided. |
| Minimum side setback | 10 ft Applies: Along each side boundary of the park § 84-68.1210 · code textSide yards of not less than ten feet along each side boundary of the park shall be provided. |
| Minimum rear setback | 10 ft Applies: Along the rear boundary line of the park § 84-68.1210 · code textA rear yard of not less than ten feet shall be provided along the rear boundary line. |
| Minimum lot size | 2,500 sq ft Applies: Lots in a mobile home park § 84-68.1202 · code textEach lot shall have an area of not less than two thousand five hundred square feet. |
When a different number applies
The code sets other values for particular lots, buildings or locations in T-1:
- Minimum front setback: 15 ft — Corner lot, on the frontage other than the principal frontage § 84-68.1308
- Minimum side setback: 3 ft — Accessory building or structure set back at least fifty feet from the front property line § 84-68.1308
- Minimum rear setback: 15 ft — Any mobile home on a subdivision lot § 84-68.1308
Not on this page
We did not find a general stories, lot coverage, FAR, density limit for T-1 in the zoning tables we read. The code may still set one elsewhere — check the Contra Costa County Municipal Code.
Other Contra Costa County zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Contra Costa County's T-1 zone?
20 ft (any mobile home or other structure in a T-1 subdivision) — Contra Costa County Municipal Code § 84-68.1310.
What is the minimum front setback in Contra Costa County's T-1 zone?
20 ft (park boundary along the public street upon which the park abuts) — Contra Costa County Municipal Code § 84-68.1210.
What is the minimum side setback in Contra Costa County's T-1 zone?
10 ft (along each side boundary of the park) — Contra Costa County Municipal Code § 84-68.1210.
What is the minimum rear setback in Contra Costa County's T-1 zone?
10 ft (along the rear boundary line of the park) — Contra Costa County Municipal Code § 84-68.1210.
What is the minimum lot size in Contra Costa County's T-1 zone?
2,500 sq ft (lots in a mobile home park) — Contra Costa County Municipal Code § 84-68.1202.
General information, not legal advice.
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