The small touches make a difference. Some outdoor storage buildings come with French doors or cupolas. You, yourself can add touches such as window boxes, shutters, or weathervanes. Remember, you'll have to look at this outdoor storage building every day of your life for the foreseeable future: Your attention to detail could make the difference between eyesore and eye-opener. On a more practical note, purchase or build a pressure-treated ramp for easy access to your outdoor storage building.
Become acquainted with zoning ordinances, deed restrictions and building codes. Depending on your area, you may need a building permit. Building codes may determine how far storage units must set back from property lines and what materials are acceptable for siding.