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Yes, you can build a sunroom addition to your home despite living in a cold climate. Make sure to use high-quality insulation and windows and to supplement with sufficient heating from your HVAC system. The windows in the sunroom allow enough natural light into the room to help heat it most times without having to use the furnace. Even a small electric fireplace can heat the sunroom well enough.

A sunroom may count toward your home's total square footage or living space if it meets certain conditions, which can vary by local regulations. Generally, for a sunroom to be included, it must be fully enclosed, properly insulated, and equipped with electrical access and a heating and cooling (HVAC) system, similar to a four-season room. It should also meet the same construction standards as the rest of the house. Three-season sunrooms that function more like enclosed porches typically do not count toward the total square footage and are considered exterior living space.

Yes, adding a sunroom can increase your home's value, with a return on investment (ROI) ranging from 20% for a screen room to 50% for a three- or four-season room. The amount of value added depends on the design. Fully insulated, temperature-controlled four-season sunrooms add the most value as they can be included in the home's total living space. In contrast, simpler structures like Arizona rooms or solariums typically have a lower return as they don't count as legal living space. A high-quality sunroom can also be an attractive feature for potential buyers, especially those who enjoy gardening. The value may also be higher in warmer climates where this feature is more sought after. When deciding, consider both the potential resale value and the personal value you will get from using the room.

If you want to hire a professional to build a screened-in porch, a local sunroom or porch contractor is your best bet. If you can't find a local sunroom builder, another option is to consider hiring a general contractor to perform the work. 

If you're handy, you may consider building the porch yourself. Before you do so, make sure you understand the local permit requirements and building codes so that you don't have any problems with the safety or structure of the porch.