A sunroom is one way to increase the space within the building and it can be built during the new construction or as an addition to an existing building. Depending on the regional climate and desired usage, sunrooms can be constructed to accommodate year-round use or just for more temperate seasons. Sunroom designs are also varied greatly and can include conservatory, gable-roof, shed, studio or solarium detailing.
A variety of factors determine the cost of a sunroom addition. The biggest factors are the size and type of room. However, there are a number of other factors that can greatly impact cost including local building code requirements for your specific area; location of the sunroom on the home; how the room ties into the rest of the home; type of roof; type of foundation; type of flooring; electrical requirements; heating and cooling requirements; and finishing touches or décor. Rooms can be very simple to very complex and it depends on design and construction of the space.
The cost per square foot of sunroom installation varies depending on the interior and exterior finishes, material types, necessary permits, architecture fees and company-related overhead. Another key factor in cost per square foot is whether the sunroom is constructed to be a three-season or a four-season space. Four season sunrooms that open up to the main house or that have a separate entry door are the most requested type. Four-season rooms are typically wired for electricity, have HVAC installed and may even have plumbing. In general, sunroom installation cost, approximately for 200 square feet is $4500.0
The addition of a sunroom or sunroom installation is not the type of DIY work. Thus, it is better to hire a professional to install it. Professionals can install prefabricated sunrooms at a lower cost than constructing a new sunroom on-site. When purchasing a prefabricated sunroom, materials dictate cost with aluminum being the least expensive, vinyl the mid-level option and wood-framed sunrooms the most expensive. Other factors that affect the cost of prefabricated sunrooms include window type (double-pane, insulated, etc.), whether the sunroom is wired for electricity or HVAC, whether it has simple glass walls that enclose a porch space or something more elaborate. Prefab sunrooms can cost anywhere from $6,000 to $30,000 or more, not including installation.
When building a foundation for a new sunroom or opening an existing home to allow access to a sunroom, local building code may require hiring an architect to draft plans. Depending on the region and local rates, the cost of hiring an architect may be a percentage of the total project cost, a flat fee, a cost per square foot of the project or based on an hourly rate.
Local municipalities dictate building codes—and whether or not a permit is needed when adding a sunroom. It’s important to have official clearance because building a sunroom addition without a proper permit can, in the worst-case scenario, lead to an insurance company denying a claim if an accident or damages occur in that space. In addition, unauthorized construction can sometimes lead to challenges when trying to sell a home down the road. Building permit costs vary by municipality. Two common factors for determining permit costs are project scope and total project value. Expect to pay $15–$50 and sometimes as much as $300 for a building permit.