A manufactured home is built to the federal HUD code on a steel chassis and delivered on its own wheels; a mobile home is the same thing built before that code took effect. Neither is a conventional house to an insurer, because the structure can be moved, is anchored rather than founded, and loses value over time while the land under it gains, so carriers write it on its own policy form rather than a standard home policy. Modular homes, built in a factory but set on a permanent foundation to the local building code, are usually insured as ordinary houses.
The form matters more here than in most lines. Some policies pay replacement cost on the home and contents; many, especially on older homes, pay actual cash value, which subtracts depreciation from the payment and can leave an owner well short of a replacement home after a total loss. Coverage for the attached carport, awning, deck, skirting and shed, which are often worth a lot relative to the home, is limited unless scheduled.
In Arizona and Nevada the risk is wind, monsoon rain, wildfire at the valley edges and heat on the roof; in Utah and Idaho it is snow load, freezing pipes under an unheated floor, wind on an open bench and wildfire in the foothills. Whether the home sits in a park or on owned land also changes the policy: the park's lease sets the liability the owner carries, and owned land raises questions about the well, the septic system and the outbuildings.
The premium is set from the home's age, size and construction, its anchoring and skirting, the location and its wind and fire exposure, the coverage form chosen, the deductible, and the household's claims history. The analysis pulls the current policy, checks the form against the home's actual value and the replacement cost of what is attached to it, and prices the alternatives.