An insulated floor (wool insulation or urethane) will be built on the installed foundation. Laying tongue-and-groove plywood on top of the foundation serves as a starting point for installation of the floor’s interior finish (some finishes require greater preparation).
The exercise continues with the insulated wall (wool insulation or urethane). Varying in height, it is closed on the exterior with plywood. It is ready to receive a wide variety of finishes, such as fiberboard siding (Canexel), aluminium, aggregate, stone, brick, etc. (Selection of some finishing materials requires greater preparation). It is mainly useful to allow plugging of the heating units and the electrical wiring. The wall’s interior finish is up to the buyer.
Whether because of view restrictions or to ensure privacy, a blind wall can be constructed with the same characteristics as a low wall. A party wall is designed as a firewall according to municipal standards.
The exterior finish of the solarium receiving wall will be removed (regardless of the cladding) to fasten the wood stringers. Installed along the entire perimeter, they serve to create a thermal barrier and for levelling and squaring of the right angles, essential to installation of a glazed room. 
The high-efficiency glass of a Four Seasons solarium allows removing of the existing door separating the solarium from the house. A bigger wall opening can be made to create an open area bathed in beautiful light, while benefiting from adequate air circulation.
Installation of an insulated false roof (wool insulation or urethane) on a street-level house is necessary, more often than not, to meet the required slope and height standards. This false roof may have one or two lean-tos. A ventilation opening is made between the existing roof and the new roof. The latter receives the same exterior finish as the former. A three-foot clearance is left around the rim of the false roof to allow installation of a waterproofing membrane on this entire surface.

If you want to have a room independent of the house by keeping the door, this isn’t a problem. However, for practical and esthetic reasons, it would be preferable to replace the existing door with a French door. Note that air circulation is much more constant and beneficial when the solarium forms an open area with the house.

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