Budget planning guide

Room Addition cost in Los Angeles, CA

A transparent starter-scope range for homeowners planning room addition in Los Angeles, CA. Review the assumptions, then use the project estimator for your own scope.

Starter-scope range

$12,240–$17,280

Planning midpoint: $14,400

The planning model applies a higher regional cost factor for this market.

What the model includes

Starter scope and assumptions

Adjust quantities for your project

Foundation

200 sq ft × $20.25

$4,050

Framing

200 sq ft × $16.2

$3,240

Roofing

220 sq ft × $10.8

$2,380

Electrical & Plumbing

1 lump sum × $4,725

$4,730

This is a budgeting example based on a defined starter scope, not a quote or a live survey of local bids. Actual pricing depends on measurements, site conditions, material choices, permits, contractor availability, and the final scope.

Local guides

Compare starter scopes by city

New York, NYChicago, ILHouston, TXPhoenix, AZPhiladelphia, PASan Antonio, TXSan Diego, CADallas, TX

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