Attached greenhouse or four-season sunroom

Coordinate glazing, structure, snow, overheating, condensation, drainage, separation from the house and heating.

VERT / GREEN

Define whether the space is seasonal, tempered or truly habitable before choosing glazing and structure.

JAUNE / YELLOW

More glazing increases solar gains and heat loss; plant moisture can condense on cold surfaces.

ROUGE / RED

Roof structure, snow load, safety glazing, drainage or habitable conversion: design/permit required.

Interactive triage

This triage helps choose the next step; it does not replace design, permitting or professional diagnosis.

Heated year-round
Treat envelope, heating, ventilation and condensation as a home addition. Large glazed roof
Verify structure, snow, glazing and waterproofing. Many plants/water
Plan humidity control, drainage and tolerant materials. Unheated seasonal space
Still document drainage, freeze risk and separation from the house.

Useful tools and data

Solar orientation
Glazing type
Structure/drainage plan

What the professional checks

Calculate loads and solar gains
Detail envelope/drainage
Coordinate ventilation/heating

Official sources

Checked 2026-08-22.

V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Addition, sunroom and atticCottage winterization