Emergency response teams cannot find you if your house number is not clearly displayed. Believe it or not, a majority are not visible from the street. It's even worse at night. A badly displayed number can cost you precious time in an emergency. 

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15.12.020 California Building Code, Section 501.2 - Address Identification

• Approved numbers or addresses shall be placed on all new and existing buildings in such a position as to be plainly visible and legible from the street or road fronting the property.

• Numbers shall contrast with their background and shall not be less than 4" in height.

• House numbers shall not be obstructed by vegetation.

• Any building located more than 50 feet from the street shall have its address posted at the driveway entrance and shall be visible from both directions of travel along the road.

• In new construction, the address shall be posted at the beginning of construction and shall be maintained thereafter, and the address shall be visible and legible from the road on which the address is located.

• Where multiple addresses are required at a single driveway, they shall be mounted on a single post, and additional signs shall be posted at locations where driveways divide.

• Where a roadway provides access solely to a single commercial or industrial business, the address sign shall be placed at the nearest road intersection providing access to that site.