Construction Contractor and Building Maintenance Services. At United Structures, formerly known as Capitol Maintenance, we are a General Contracting Company that provides Building Maintenance and Construction Contractor services. Our services include Kitchen Remodel, Bathroom Remodel, Wood and Metal Stud Framing, Repairs, AMC Panel Install and Repair, Exterior Painting Contractor, Interior Painting Contractor, Tile, Cabinetry, Countertops, Roof Cleaning, Roof Moss Removal, Cedar Shake Roof Cleaning, Gutter Cleaning, Pressure Washing and Window Cleaning Services in the Portland and Salem metro areas. We take great pride in our work and are always ready to care for your needs and schedule. If you have any request, we would love to work with them.