X-nth (say "eks' en' th"). Going to the "nth degree" for customers is what the company says it strives for. It designs, installs, and maintains mechanical, electrical, plumbing, lighting, communications, fire and safety, environmental, and specialty systems for companies in the healthcare, science and technology, entertainment and gaming, and hospitality industries. X-nth has helped create casinos, theme parks, hotels, hospitals, and labs for Discovery Communications, Time Warner, the FDA, MD Anderson, Harrah's, Walt Disney World, and others. The company works internationally from nine US offices.

PCI Industries blows hot and cold. Operating through two divisions, the company distributes and manufactures a variety of products for the heating, ventilation, and air-conditioning (HVAC) industry. Its Air Product Sales division distributes commercial HVAC products to customers primarily in the southern California area, while its manufacturing division makes damper, louver, silencer, and architectural sun control products sold under five primary brands: flagship louver and damper brand Pottorff, C&S Air Products, Dynasonics, All-Lite Architectural Products, and AirManagers.

Cavalier Homes builds castles for regular Joes. Through about a half-dozen plants the company makes manufactured single- and multi-section homes for the low- to medium-priced market in the south-central and south-Atlantic US; it delivers around 4,000 homes annually. Louisiana is its largest market. Cavalier Homes also makes cabinetry and laminated wallboard. The company markets its products through a network of about 50 exclusive and about 240 non-exclusive dealers, as well as one company-owned retail center. Southern Energy Homes, a subsidiary of Berkshire Hathaway portfolio company Clayton Homes, bought Cavalier Homes for nearly $50 million in 2009.

International Barrier Technology Inc., through its subsidiaries, develops, manufactures, and markets proprietary fire resistant building materials designed to protect people and property from the destruction of fire in the United States. It provides Pyrotite, a fire-barrier material designed to prevent ignition and inhibit the spread of flames; and Blazeguard, a composite fire-rated panel for various markets, including multifamily roof deck applications, structural insulated panels, commercial roof deck applications, and roof assemblies in commercial modular buildings.

Pioneer Millworks is blazing a trail in the reclaimed-wood millworks industry. The firm reclaims or harvests a variety of wood species with a range of grades and finishes to produce timbers, flooring, and millwork. Much of the wood Pioneer Millworks reclaims comes from old barns and industrial buildings. The company has also launched a unit that manufactures engineered flooring that uses recycled material and formaldehyde-free adhesives. Sister company New Energy Works Timberframers focuses on creating timber-frame structures. Founder and president Jonathan Orpin owns Pioneer Millworks.

Royal Boon Edam has an open-door policy -- especially if you're in the market for a securely closed door. The company has been making revolving doors and security barriers for more than 100 years. It offers a wide range of customizable products including manual and automated revolving doors, specialty slide doors, and high-capacity turnstiles. Boon Edam also provides handicap access gates and high-impact-resistant vehicle barriers.

RJC Architects, formerly Robbins Jorgensen Christopher, is keen on getting public interest. The architecture firm specializes in the development of public works projects such as fire stations and college buildings. Landscape architecture for golf courses and government buildings is another of the company's endeavors. RJC Architects has offices in Southern California and has operations throughout the southwestern US.

United Subcontractors, Inc. (USI) insulates its customers from the harsh conditions of the great outdoors. The company, which was founded in 1998, installs residential and commercial insulation systems in more than 150,000 homes and buildings annually. In addition to new residential projects, the company provides services for commercial construction. It also offers building products including shelving, fireproofing, garage doors, flooring, windows, glass, and paneling. USI has some 35 US locations. A downturn in the construction and new home building market forced USI to file for Chapter 11 bankruptcy protection in 2009. It emerged from bankruptcy later that year.

Lewis & Hockenberry produces dimension hardwood products using kiln-drying techniques. Its products, which the company sells worldwide, include logs, rough or machined lumber squares (cut to customer specifications), dowels, and wood panels. The company procures a range of hardwood timber species, including white ash, black cherry, hard and soft maple, red oak and white oak, from company-owned land and through private landowner agreements. Brothers Dale and David Lewis, nephews of cofounder Gerald Lewis, own the company. Lewis & Hockenberry was founded in 1946.

Established in 1857, William A. Berry & Son, Inc. prospered as a local North Shore builder, specializing in high-end carpentry and millwork. Founded by William Berry, a respected member of a prominent Danvers family, Berry is one of the oldest construction companies in the nation. The last member of the Berry family to own the company was third generation Dudley "Max" Berry. A graduate of West Point, Max Berry developed an unusual niche for his family business: moving historical buildings. From the 1940's through the mid 1980's, Berry relocated homes from New Hampshire and Vermont and rebuilt them in locations such as South Natick, Martha's Vineyard and Nantucket.

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