Residential. A one-story detached accessory structure that is no more than 200 square feet (18.58 m2 ) of floor area, no more than 15 feet (4,572 mm) in height, does not create a dwelling, contains no plumbing, and is not located within a flood hazard area.
The quick and simple answer is: you usually don't need a permit if the shed is 120 square feet or less. In California, most jurisdictions have adopted the 120 square foot rule. If your shed area is larger than 120 square feet, it needs a building permit.
What's the biggest you can build in Texas without a permit? Very generally speaking, the biggest you can build in Texas without a permit is 200 square feet.
When you build a new home in Travis County, outside any city limits, a permit is still required through Travis county. And not just Travis County. Other jurisdictions in the neighborhood may need permits.
NO PERMIT REQUIRED FOR: Replacement of any switch, receptacle, fuse, fan, light fixture or similar equipment that does not alter mechanical, electrical or plumbing systems. Ordinary, minor nonstructural repair(s) or remodeling such as painting, papering, siding and similar finish work.
The following list of construction or remodeling projects typically do not require a permit. One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 300 square feet. Cabinets & counter tops. Carpeting and wood/laminate flooring.
Buildings under 10 m2 (107 sq. in area typically do not require a building permit, however, they must comply with the rules listed under where can you build? and what design rules do you need to meet?
Trade contractors must be licensed by the State of Texas and must be registered with the City of Austin before performing any work.