Room Addition Cost in Los Angeles, CA
Los Angeles remodeling costs are nearthe California state average. Here's what a typical room addition costs in Los Angeles in 2026, based on a 300 sqf project.
Cost breakdown
Breakdown based on mid-range estimate of $110,250
Building permit, structural engineering, possibly zoning approval.
Remodeling in Los Angeles
LA's sprawling metro has the highest concentration of contractors in the state. Competition keeps pricing moderate, but demand for ADUs has surged since California relaxed regulations. Earthquake retrofitting adds cost to older homes.
A room addition adds square footage and value to your home. Costs depend on whether it's a simple bump-out, a second story, or a full wing addition with plumbing.
Have estimates for your Los Angeles project?
Upload them and get an AI-powered comparison with CSLB license verification. Free.
Other projects in Los Angeles
Room Addition cost in other California cities
Get a personalized estimate
Use our interactive cost estimator to adjust square footage and see detailed pricing for your specific project.
Open Cost Estimator →