Cost of Sunroom Addition in Ontario, CA — 2026 Price Guide
Ontario, a San Bernardino County community of 175,265 in the Southern California, has its own set of considerations when it comes to sunroom addition. In 2026, the typical cost runs about $28,200 per addition, though prices can vary. Here's everything you need to know.
2026 Sunroom Addition Cost in Ontario, CA
| Cost Level | Price (per addition) | What to Expect |
|---|---|---|
| Budget / Low-End | $9,400 | Basic scope, standard materials, smaller projects |
| Average / Mid-Range | $28,200 | Typical project scope with quality materials |
| Premium / High-End | $70,500 | Large scope, premium materials, complex projects |
Prices are estimates for Ontario, CA in 2026 and reflect local market conditions in San Bernardino County County. Your actual cost will depend on the specifics of your project.
Factors That Affect Sunroom Addition Cost in Ontario
When you request a quote for sunroom addition in Ontario, contractors evaluate these factors.
- Size of the sunroom
- Type (3-season vs. 4-season)
- Foundation requirements
- Glass type and window quality
- HVAC extension requirements
- Electrical work needed
- Permit and architectural plan costs
What Ontario Homeowners Should Know
Sunroom Addition projects in Ontario typically require a permit from San Bernardino County. Your contractor should handle the permit application.
Always verify your Ontario sunroom addition contractor's CSLB license at cslb.ca.gov before signing a contract.
How to Save Money on Sunroom Addition in Ontario
Smart Ontario homeowners know there are ways to reduce sunroom addition costs without sacrificing quality.
- Choose a 3-season room for significantly lower costs
- Use a kit or prefab option over full custom
- Consider a screened-in porch as a budget alternative
- Install during off-season for better contractor rates
- Check if your HOA allows sunroom additions before planning
Frequently Asked Questions
How much does sunroom addition cost in Ontario, CA?
The average cost of sunroom addition in Ontario is approximately $28,200 per addition in 2026. Prices range from $10,000 to $75,000 depending on project scope.
How long does sunroom addition take in Ontario?
Most sunroom addition projects in Ontario take 2-6 weeks to complete. Factors like project complexity and weather in San Bernardino County can affect the schedule.
Do I need a permit for sunroom addition in Ontario?
Yes, sunroom addition projects in Ontario typically require a permit from San Bernardino County.
How do I choose a sunroom addition contractor in Ontario?
Get at least three quotes from Ontario contractors, verify their CSLB license, check reviews, and never pay more than 10% or $1,000 upfront.
Get Free Quotes from Ontario Sunroom Addition Pros
Compare quotes from Ontario's best sunroom addition contractors. It's free, fast, and zero obligation.