Quick answer: A room addition costs $60,000–$450,000 in Los Angeles, depending on size and whether it’s built out or up. APLA Construction (CA Lic #1136359) provides free estimates across Greater Los Angeles.
Whether you need more space for a growing family, a home office, or an in-law suite, APLA Construction delivers expertly built room additions in Los Angeles that seamlessly integrate with your existing home. As a licensed California general contractor (#1136359), we handle every phase from design through final inspection. Learn more about our addition services.
| Project Type | Typical Cost |
| Single room addition (200–400 sq ft) | $80,000–$150,000 |
| Master suite addition | $120,000–$220,000 |
| Second story addition | $200,000–$450,000+ |
| Bathroom addition | $60,000–$120,000 |
Costs vary based on structural requirements, finish level, and permit complexity in your jurisdiction. APLA provides detailed, itemized estimates at no charge.
Yes. All room additions in Los Angeles require building permits from the LA Department of Building and Safety (LADBS) or your local city building department. APLA manages the entire permit process for you.
A standard single room addition takes 3-6 months from permit approval to completion. A second story addition can take 6-12 months depending on structural complexity and permitting timelines.
Yes. In the Los Angeles real estate market, added square footage typically returns 50-80% of construction cost in home value. Additions that add bedrooms or bathrooms often yield the highest returns.
APLA designs additions to match your home’s existing architecture, roofline, and exterior finishes so the addition looks like it was always part of the original structure.
Phone: (818) 818-4419
Email: info@aplaconstruction.com
License: CA #1136359 — verify on CSLB
Serving all of Greater Los Angeles – San Fernando Valley, Westside, South Bay, Pasadena, and beyond.
APLA Construction provides Room Addition services throughout Greater Los Angeles. Click your neighborhood to see local pricing and details.