Permits for residential structures shall become invalid unless the work on the site authorized by such permit is commenced within 12 months after its issuance.
In the City of Riverside, any residential property can add at least one Accessory Dwelling Unit, per State law (see reverse side). Properties developed with single-family homes can also add a Junior Accessory Dwelling Unit.
Projects that DO NOT need a building permit are simple surface (cosmetic) projects; minor repairs and replacements; and minor site improvements or small structures.
On average, homeowners can expect to spend anywhere from $3,000 to $10,000 on permit fees for an ADU project in Riverside County.
Projects that change the configuration of walls, pipes, wiring, roofs, or major appliances typically DO require at least one type of building permit. Projects that DO NOT need a building permit are simple surface (cosmetic) projects; minor repairs and replacements; and minor site improvements or small structures.
Per the California Residential Code detached accessory structure not exceeding 120 square feet does not require a building permit if there is no plumbing, electrical, and or mechanical equipment.
A permit is required before constructing, enlarging, altering, repairing, or demolishing a building or structure or installing or altering any equipment which is regulated by the model codes adopted by the County of Riverside.
Types of Projects That May Be Exempt From a Building Permit in California Painting. Floor upgrades. Kitchen remodels. Small drywall projects. Common electrical work. Small outbuildings. Bathroom fixes. Fences.