Manufacturers offer a variety of colors to choose from for metal wall panels, roof panels and the trim that lines the edges of their buildings. Some also produce panels with acrylic stucco or simulated concrete finishes.
You can, of course, paint and finish your steel building yourself, although manufacturers do warrantee their coatings, surfaces and paint finishes as an added incentive for you to purchase components that have been pre-finished. Paint and finish warranties can range from years to decades, to as much as a half-century, depending on the finish grade. Unpainted panels coated with Galvalume (a zinc-aluminum coating), are typically warranted for up to 20 years. These types of finish are most common on Quonset hut buildings.
If desired, professional finishes like wood paneling, stucco, brickwork, wainscoting, or masonry can be applied to make your steel building look like a regular wood-framed structure & blend in with your existing buildings. With a professionally- applied high-quality finish, the average person will be unable to tell that the building is pre-engineered steel. If you do decide to add your own aftermarket finish, general contractors can be hired to do this for you as well.