Manufactured housing is a type of housing unit that is largely assembled in factories and then transported to sites of use.The term "manufactured home" specifically refers to a home built entirely in a protected environment under a federal code set by the US Department of Housing and Urban Development  (HUD). Manufactured homes are not mobile homes.

The term "mobile home" describes factory-built homes produced prior to the 1976 HUD Code enactment.

The original focus of this form of housing was its mobility. Units were initially marketed primarily to people whose lifestyle required mobility.

Previously, units had been eight feet or less in width, but in 1956, the introduction of the 10-foot wide mobile home was made. This helped solidify the line between mobile homes and house/travel trailers, since the smaller units could be moved simply with an automobile, but the larger, wider units required the services of a professional trucking company.

In the 1960s and '70s, mobile homes became even longer and wider, making the mobility of the units more difficult. Today, when a manufactured home is moved to a location, it is usually kept there permanently. Since the 1970s, the term "manufactured home" has largely replaced "mobile home," since the mobility of the units has considerably decreased.

The manufactured homes of the past developed a negative stereotype because of their lower cost and the tendency for their value to depreciate more quickly than site-built homes.

The tendency of these homes to rapidly depreciate in resale value made using them as Collateral for loans far riskier than traditional home loans.

Terms were usually limited to less than the thirty year term typical of the general home-Loan market, and Interest rates were considerably higher. In other words, mobile home loans resembled motor vehicle loans far more than traditional home mortgages. They have been consistently linked to lower-income families, which has led to prejudice and Zoning restrictions, which include: limitations on the number and density of manufactured homes permitted on any given site, minimum size requirements, limitations on exterior colors and finishes, and foundation mandates.

There are many jurisdictions that will not allow the placement of any additional manufactured homes, while others have strongly limited or forbidden all single-wide models, which tend to depreciate in value more rapidly than modern double-wide models. Modern manufactured homes, especially modular homes, belie this image and can be identical in appearance to site-built homes.

Newer manufactured homes, particularly double-wides, tend to be built to much higher standards than their predecessors and meet the building codes applicable to most areas. This has led to a reduction in the rate of value Depreciation of most used units.

Both manufactured (mobile) homes and modular homes are commonly referred to as manufactured housing, but they are not identical. Modular homes are transported on flatbed trucks rather than being towed, and lack axles and an automotive-type frame typical of manufactured homes. However, like manufactured homes, some modular houses are towed behind a semi-truck on a frame similar to that of a manufactured home.

The house is usually in two pieces and is hauled by two separate trucks. Each frame has five or more axles, depending on the size of the house. Once the house has reached its location, unlike a manufactured home, the axles and the tongue of the frame are then removed, and the house is set on a concrete foundation by a large crane. Most zoning restrictions on modular homes have been found to be inapplicable or only applicable to manufactured homes. This occurs often after considerable litigation on the topic by affected jurisdictions and by plaintiffs failing to ascertain the difference.

Most modern modular homes, once fully assembled, are indistinguishable from site-built homes. Their roofs are usually transported as separate units, eradicating the telltale roofline of the manufactured home. As the legal differentiation between the two becomes more codified, the market for modular homes is likely to grow. The traditional manufactured home industry would seem to have a bright future as well. As the demand for housing continues to grow, the price of housing continues to increase rapidly.

The constant improvement of quality and features of manufactured homes has led to greater acceptance by a growing segment of the marketplace.

Additionally, insurers and lenders are now more likely to treat the higher-end manufactured home as they would a traditional home.