Calabasas, Los Angeles County

Room Addition Cost in Calabasas, CA

Calabasas remodeling costs are 15% abovethe California state average. Here's what a typical room addition costs in Calabasas in 2026, based on a 300 sqf project.

Budget

$69,000

$230/sqf

Mid-Range

$120,750

$402/sqf

High-End

$189,750

$633/sqf

Cost breakdown

Foundation & Framing

30%$36,225

Roofing & Exterior

15%$18,113

Mechanical (HVAC, Electrical)

15%$18,113

Interior Finishes

20%$24,150

Windows & Doors

10%$12,075

Permits & Engineering

10%$12,075

Breakdown based on mid-range estimate of $120,750

Typical Timeline

3-6 months

Permits Required

Building permit, structural engineering, possibly zoning approval.

Remodeling in Calabasas

Upscale suburban community with large homes. Many gated communities with HOA requirements. Fire risk in hillside areas adds defensible space and fire-resistant material requirements.

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.

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