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If you’re looking to add extra living space and natural sunlight to your home, a sunroom addition is a great choice. A sunroom is a room addition that features large windows and glass panels that give you an unobstructed view of the outdoors. allowing your family to enjoy the outdoors from the comfort of your home, creating a peaceful area to relax and recharge. Fifty percent of the cost of addition can be added to the value of your home instantly (for a four-season sunroom).
There are different types of sunrooms, including three- and four-season sunrooms, patio enclosures, conservatories, and solariums. We’ll go over the differences, and the average price ranges for different types and sizes of sunrooms here in California.
A sunroom costs about $100 to $350 per square foot to build in California. A 3-season sunroom typically costs between $15,000 and $90,000 to build, and a 4-season sunroom usually costs between $30,000 to $120,000 to add in Northern California. A glass solarium can cost between $30,000 and $160,000 to add to your home. Pre-fabricated sunrooms, aka sun porches, can run about $6,000 to $50,000. Data from Angi[1] shows that the average price of a sunroom addition in California in 2025 was $68,000.
Though sunrooms come in many different sizes, the most popular dimensions are 12’ x 12’ and 16’ x 24’.
The price range of a sunroom depends on factors such as quality of materials, design complexity, local labor costs, and the size of the sunroom. If you use energy-efficient triple-paned windows or build a larger four-season sunroom, conservatory, or solarium, this can increase the overall price of the room addition project.
Here are factors that influence the cost of a sunroom in Sacramento.
Materials. The quality of materials you choose will influence the cost of the project. Windows and glass with more energy-efficient layers and higher quality roofing materials will cost more but can be worth the investment.
Size and Design Complexity. Larger sunrooms will cost more, and sunrooms with a complex or bespoke design will also add to the final price.
Labor. Local labor costs can affect the overall price of a new sunroom in Sacramento or other larger cities.
Permits & Insurance. Obtaining required permits will be part of the total cost, insurance is also required for reputable contractors.
There are different types of sunrooms, each with their own unique definitions. Here’s a breakdown of the defining features and price ranges. Typically, four-season sunrooms and conservatories are on the higher end of the price range. Three-season sunrooms, solariums, and sun porches are on the lower end of costs.
A 3-season sunroom is a fully enclosed room, built on a foundation, with no insulation, no electrical wiring, and no HVAC system. These sunrooms are similar to an enclosed sun porch with glass walls. This type of sunroom often incorporates ceiling-to-floor glass panels, and may fit under a roof like a sun porch. These are named 3-season sunrooms because they are only comfortable to use three seasons per year.
A small 3-season sunroom that is 8’ by 8’ can be priced around $15,000 to $25,000. A larger 3-season sunroom that is 20’ by 20’ can be $80,000 to $90,000.
A four-season sunroom is a fully integrated home addition with insulation, electricity, and a heating and cooling system. Because these rooms require wiring and HVAC ducts for temperature regulation, this sunroom style usually features a knee wall rather than floor-to-ceiling windows.
A four-season sunroom adds square footage and appraisal value to your home. These sunrooms are equipped with insulation and HVAC systems, so they are comfortable and usable year-round. Typically, a four-season sunroom will have a knee well near the roof, which is a short wall with a base plate, used to accommodate the ductwork for the HVAC system and insulation. The larger the square footage of the sunroom, the larger the HVAC system must be to heat and cool the area. A small four-season sunroom sized 8’ by 8’ may be $25,000 and up, while a larger 4-season sunroom sized 20’ by 20’ can run $120,000 to $160,000. Many 4-season sunrooms are either 12’ by 12’ or 12’ by 14’.
A solarium is a type of sunroom made entirely of glass including the ceiling. These usually do not have electricity or an HVAC system (like a 3-season sunroom). These differ from a greenhouse because they have a fully finished floor. These allow you and your family to view the outdoor landscapes and stars unobstructed. These have floor-to-ceiling windows and a glass ceiling.
A conservatory is a type of sunroom that also has a glass ceiling and large panoramic glass windows. Originally, these were designed to function as greenhouses, but they can be used for stargazing, relaxing, and entertaining. Sunlight shines directly into the glass windows and ceiling. These come in many variations, which are classified by the type of design and complexity. The main two types are Edwardian and Victorian, named after the periods in which they first appeared in architecture. Edwardian design is more rectangular, and fits well with modern architecture. Victorian conservatories have more intricate design and can be designed to fit the home. A conservatory addition can cost between $200 and $500 per square foot.
Conservatory additions have an ROI of 50% to 75%, so most of the cost is added to the appraisal value of your home.
Prefab sunrooms come in kits with all the necessary building materials. Homeowners that are especially handy may choose to assemble these kits themselves, but many homeowners prefer to have a contractor do the work to ensure the construction is stable and steadfast. Larger prefab kits can be somewhat complex to assemble. The price varies on the size of the kits and the quality of the materials.
These are almost always prefab kits with glass or plastic panels. These lack a foundation and insulation and are usually built on an existing deck or porch.
Sunrooms can be rather heavy, so a solid foundation is required to support the weight of the structure. Usually, this is a concrete foundation. For sun porches, enclosed patios, or pre-fab greenhouses, they may be built on an existing treated wood deck.
Sunrooms add living space to your home and a unique selling point for potential buyers. For appraisal purposes, only a four-season sunroom adds square footage and extra appraisal value to your home. The good news is the return on investment is 50% of the cost of adding a sunroom, recouped on the first day. This is approximately how much your home value will increase instantly.
Homeowners in the Sacramento area, if you’re looking for a reliable remodeling contractor to help you add a sunroom, JC Construction & Remodeling is here to help. For over a decade, we’ve helped homeowners in the Sacramento region with kitchen remodeling, bathroom remodeling, and room additions. If you’d like a free consultation with one of our remodeling experts, schedule an appointment using this calendar. We look forward to helping you bring your vision to life.
[1] Angi, https://www.angi.com/articles/how-much-does-sunroom-cost.htm , Retrieved October 17, 2025.
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