A solarium (or a sunroom) is a structure, usually constructed onto the side of a house, to allow enjoyment of the surrounding landscape while being sheltered from adverse weather conditions such as rain and wind. The concept is popular in the United States, Europe, Canada, Northern Ireland, Australia and New Zealand.
In Great Britain, it is normally described as a conservatory, although the room may not contain plants. However a British sunroom has a solid opaque roof whereas a conservatory has a transparent or semi-transparent roof.

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The structure is often referred to as a patio room, sunroom, conservatory, patio enclosure or Florida Room. It can be constructed of brick, breeze block, wood, glass or PVC. The brick or wood base makes up the main support for the PVC, referred to as the “knee wall”, which is attached to the top of it. The glass panels are large and often clear instead of frosted. The roof may be of glass panels but is more usually of a plastic material which lets in sunlight. Some sunrooms are designed for scenic view, while others are designed to collect sunlight for warmth and light. These, usually called solariums, are found in Northern (low sun angle) or cold (high altitude) locations. Solariums have walls made up of glass (or plastic), often curved joining windows, and glass roofs. Sunrooms tend to have conventional roofs.

Newer rooms are typically constructed of aluminum framing with tempered glass as the primary structure. The room system is normally constructed of aluminum insulated panels or glass for the “high end” options. Skylights may be included in the insulated panels. The outside of the roof is normally constructed with a shingled roofing material.
Whereas the majority of florida rooms or sunrooms of the past appeared to be disassociated with the home, newer public taste places a great deal of emphasis in blending the sunroom into the architecture of the home.
With the latest technologies of glass and heat resistant technology, sunrooms are now able to be used as efficiently in the southern states such as Florida, Texas and Arizona as is possible in the colder, northern states.