A second story addition is one of the most transformative home improvement projects available to Los Angeles homeowners — and one of the most complex. Unlike a ground-floor room addition, going vertical requires temporary relocation during construction, significant structural work, roof removal, and careful sequencing of trades. When it is done right, a second story doubles your livable space without sacrificing yard area. APLA Construction (CA Lic #1136359) builds second story additions across Greater Los Angeles and this guide covers everything you need to make an informed decision.
Second story additions are among the most expensive residential projects per square foot in Greater LA due to the structural complexity and temporary measures required.
These figures include design, permits, temporary weatherproofing, structural work, and full interior finishes. They do not include temporary relocation costs if the family needs to move out during construction.
Several factors push the cost per square foot higher on vertical additions:
Most LA homeowners adding a second story are looking to solve a specific space problem. Common second story configurations include:
Before any design begins, a structural engineer assesses whether the existing foundation, first-floor walls, and framing can support a second story. Most LA homes built after 1980 can accommodate a second story with targeted reinforcement. Older homes (pre-1960) often require more significant first-floor strengthening.
Full architectural and structural drawings are required for permit submittal. The design phase defines the floor plan, room layout, exterior appearance, staircase location, and all structural specifications. APLA coordinates with experienced architects familiar with LADBS requirements and California Title 24 energy code.
Second story additions go through full plan check at LADBS or the relevant city building department. Expect 3–5 months for City of LA properties with a complete submittal. Santa Monica, Pasadena, and Glendale have their own timelines. Projects in hillside areas or HOA neighborhoods may face additional review.
Most families choose to temporarily relocate during the roof removal and framing phase — typically 4–8 weeks. APLA schedules this phase carefully to minimize displacement time and coordinates temporary weatherproofing to protect the home throughout.
First-floor structural reinforcement (if required), roof removal, second-floor framing, new roof installation. This is the most disruptive phase and the one that most requires the family to be off-site.
All MEP rough-in for the second floor: extending electrical panel capacity, running new plumbing supply and drain lines, HVAC ducts or mini-split units for the new space.
Insulation, drywall, flooring, cabinetry, bathrooms, interior doors, trim, paint, and all fixture installation.
All trades inspected, punch list completed, Certificate of Occupancy issued.
Choose a second story addition if:
Choose a ground-level room addition if:
See all room addition services from APLA Construction.
In the right LA markets, a second story addition delivers strong property value returns. Adding 1,000 sq ft in neighborhoods like Sherman Oaks, Studio City, or Culver City can add $350,000–$600,000 in market value depending on finish level and the home’s base value. For homes in the $1,000,000–$1,500,000 range, a quality second story that brings the home in line with larger neighboring properties often returns more than its construction cost in immediate equity.
A second story addition in Los Angeles costs $350–$500 per square foot in 2026, including design, permits, and full finishes. A partial second story (500–800 sq ft) runs $200,000–$400,000. A full second floor (1,000–1,500 sq ft) runs $350,000–$600,000. Costs are higher than ground-level additions due to structural complexity, roof removal, and seismic requirements.
Temporary relocation is strongly recommended during the roof removal and framing phase — typically 4–8 weeks. After the new structure is weathertight, most families can return while interior finishes are being completed. APLA manages the construction sequence to minimize displacement time.
At LADBS, second story addition permits typically take 3–5 months through plan check. Complex projects — hillside lots, significant structural changes, or homes in design review areas — can take 5–8 months. A complete, accurate permit submittal is the best way to avoid correction rounds that reset the clock.
Not all homes are equally suited. A structural engineer must assess the existing foundation, first-floor walls, and framing before design begins. Most homes built in LA after 1970 can support a second story with targeted reinforcement. Pre-1960 homes often require more work. Hillside properties and homes with unusual soil conditions need geotechnical review as well.
In high-value LA markets — Sherman Oaks, Studio City, Culver City, Brentwood, Pasadena — a quality second story addition typically returns its cost in equity and may exceed it. The key is ensuring the final home value is in line with the neighborhood. Adding 1,200 sq ft to a $1.2M home in Studio City to bring it to $1.8M is financially strong. Adding the same to a $600K home in a $900K max market is not.
Yes. APLA Construction builds second story additions throughout Greater LA — San Fernando Valley, Westside, South Bay, and Pasadena area. We coordinate design, permits, and construction under one contract.
APLA Construction provides free on-site estimates for second story additions throughout Greater Los Angeles. We will evaluate your existing structure, explain what the design and permit process looks like for your specific property, and give you a realistic cost and timeline estimate.
Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359
Serving Sherman Oaks, Studio City, Encino, Culver City, Pasadena, Glendale, and all of Greater Los Angeles. Learn more about our addition services.