Sausalito, Marin County

Room Addition Cost in Sausalito, CA

Sausalito remodeling costs are 30% abovethe California state average. Here's what a typical room addition costs in Sausalito in 2026, based on a 300 sqf project.

Budget

$78,000

$260/sqf

Mid-Range

$136,500

$455/sqf

High-End

$214,500

$715/sqf

Cost breakdown

Foundation & Framing

30%$40,950

Roofing & Exterior

15%$20,475

Mechanical (HVAC, Electrical)

15%$20,475

Interior Finishes

20%$27,300

Windows & Doors

10%$13,650

Permits & Engineering

10%$13,650

Breakdown based on mid-range estimate of $136,500

Typical Timeline

3-6 months

Permits Required

Building permit, structural engineering, possibly zoning approval.

Remodeling in Sausalito

Iconic waterfront town with steep hillsides and limited access. Parking and material staging challenges add to contractor costs. Historic character of many homes limits exterior modifications.

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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