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Building an average-sized sunroom typically takes between two and four weeks, depending on the features you choose. However, more elaborate or larger sunrooms can take up to six months from start to finish. The timeline depends on the type of sunroom you want to build and whether it's a retrofit or you're starting from scratch.

The least expensive way to enclose a porch is with screens. These protect the room by preventing insects from entering and, if you live in a warm climate, provide excellent airflow during hot summer months. Screens cost far less than any other alternative, so if you are against getting permits, spending too much, or enclosing your porch in walls or glass, screens are the best choice. 

A 12-foot-by-12-foot porch is a 144-square-foot porch. It costs about $5 to $7 per square foot to add a screen. So, you’ll likely pay between $700 and $1,000 to screen in your porch, depending on the type of screen you choose. If you’re starting from scratch, building a new 12-foot-by-12-foot screened-in porch will cost about $6,400 to $18,300.

When designing an attached greenhouse, several factors should be considered. These include the orientation and positioning of the greenhouse to maximize sunlight exposure, the structural integrity of the connection to the house, sufficient insulation to regulate temperature, proper ventilation for airflow, and adequate space for plants and pathways. If you’re restricted because of your budget, go with a simpler design to maximize the use of your money.