Outdoor storage
Items intended for outdoor use on a residential property such as picnic tables, children's toys and bicycles are allowed to be kept outdoors. Items intended for indoor use such as household appliances may not be stored outside. Tools, equipment and supplies utilized for automobile repair or construction may not be stored outside.
Parking on unpaved surfaces

Parking on dirt areas is not allowed. Allowable parking surfaces for single-family dwellings include 6 inches of gravel, roadbase material (recycled asphalt), asphalt, or concrete. Allowable parking surfaces for 2-unit dwellings or multi-unit dwellings include roadbase, asphalt, or concrete.
Too many cars
Denver households are allowed one vehicle per licensed driver, plus one extra vehicle. For example, a household consisting of three licensed drivers may have up to four vehicles at the residence. Additional cars would be considered in violation of the code.
Inoperable vehicles
Parking or storing inoperable motor vehicles in any residential zone district is restricted to one vehicle that must be stored inside an enclosed garage. A vehicle that is not operable cannot be stored on the street or in a driveway of a home.
Too many unrelated people
Any number of persons related by blood, marriage or adoption may live together in a single-family residence. Also, two unrelated adults may live together. In 2-unit and multi-unit dwellings up to 4 unrelated adults may live together.
Home occupations
Home occupations are allowed in Denver. The business must be operated in a completely enclosed structure, the primary dwelling unit or a detached accessory structure as allowed by the Zoning Code. The Home Occupation shall not display or create outside the building any external evidence of its operation. A sign of up to 100 square inches in size is allowed. See Home Occupation Application (PDF) for greater detail.
Too many animals
The Denver Zoning Code rgulates how many household pets can be part of a home residence. Violations occur when the number of household pets exceeds 3 dogs, 5 cats, 2 rabbits, or 25 pigeons, or 5 total dogs and cats or 2 domestic honey bee hives.
Construction without a permit
Most construction projects require a zoning permit and may also require a building permit. For example, construction of fences, sheds, and gazebos all require zoning permits and depending on their design require a building permit too. Check the requirements for your project under Home Projects.