Quick answer: A sunroom addition costs $20,000–$80,000 in Los Angeles — a three-season sunroom without full HVAC is the affordable option, while a four-season conditioned sunroom that counts as living square footage costs significantly more. APLA Construction (CA Lic #1136359) handles this throughout Greater Los Angeles.
A sunroom is one of the highest-value additions Los Angeles homeowners can make, blending indoor comfort with the city’s famous year-round sunshine. Whether you are in Sherman Oaks, Pasadena, Manhattan Beach, or Studio City, a well-built sunroom expands your living space, raises your home value, and gives you a bright spot to relax in every season. As a licensed general contractor (CA Lic #1136359) serving greater Los Angeles, APLA Construction builds sunrooms that meet California energy code and pass LADBS inspection the first time.
In Los Angeles, a sunroom addition typically costs between $20,000 and $80,000 depending on size, foundation work, glazing, and whether the room is climate-controlled. Here is a realistic 2026 breakdown:
| Item | Typical Cost |
| Three-season sunroom | $20,000 to $40,000. Enclosed with large windows but no full HVAC. |
| Four-season (conditioned) sunroom | $45,000 to $80,000. Insulated, heated and cooled, usable year-round and counted as living square footage. |
| Cost per square foot | roughly $200 to $400 in LA, higher for premium glazing or hillside foundations common in Bel Air and the Hollywood Hills. |
Factors that push cost up include tying into your existing HVAC, upgrading the electrical panel, premium low-E glass for Title 24 compliance, and pouring a new foundation on a sloped lot.
Foundation type, roof style (solid vs. glass), the number of operable windows, and permit fees in your specific LA jurisdiction all affect the final number. A solid-roof sunroom in Torrance will price differently than a glass-roof conservatory in Brentwood.
A sunroom that adds conditioned square footage requires a building permit from LADBS or your local city building department. Because it adds glazing, it must meet California Title 24 energy standards, which is why low-E, dual-pane glass is standard on quality LA sunrooms. APLA handles the full permit package, structural plans, and inspections so you never have to navigate the counter yourself.
Coastal homeowners in Santa Monica, Redondo Beach, and Pacific Palisades favor four-season sunrooms with corrosion-resistant framing for the salt air. Valley homeowners in Encino, Tarzana, and Woodland Hills often choose solid-roof designs with ceiling fans to handle summer heat. Whatever your microclimate, we design for it.
Yes. A four-season sunroom counts as livable square footage and typically returns 50 to 70 percent of its cost at resale, plus it makes your home more appealing in a competitive Los Angeles market.
Almost always, yes. Any enclosed addition with electrical or that adds conditioned space requires a permit. APLA pulls all permits for you.
Most LA sunroom projects take 4 to 8 weeks of construction after permits are approved, depending on foundation and weather.
Absolutely. We match rooflines, stucco, paint, and trim so the addition looks original to the home, whether it is a Spanish Revival in Los Feliz or a midcentury home in Mar Vista.
Ready to add light and space to your home? APLA Construction is a licensed Los Angeles general contractor (CA Lic #1136359 — verify on CSLB) building sunrooms across the LA area. Call (818) 818-4419 or email info@aplaconstruction.com for a free, no-pressure estimate. Explore our home addition services or read our Room Addition Cost Guide to plan your project.