Renovation costs · San Fernando Valley · 2026
What does a room addition cost in the San Fernando Valley?
Most room addition projects in the Valley land between $90,000 and $140,000 (medium size, mid-range finishes). The full spread runs $35,000 to $340,000 depending on size, finish level, and scope.
Cost by size and finish level
| Finish level | Small | Medium | Large |
|---|---|---|---|
| Budget-Friendly | $35k–$55k | $60k–$95k | $95k–$150k |
| Mid-Range | $55k–$85k | $90k–$140k | $140k–$220k |
| High-End | $85k–$130k | $135k–$210k | $210k–$340k |
Sizes: Small — under 200 sq ft · Medium — 200–400 sq ft · Large — over 400 sq ft
Where the money goes
Share of total cost, with dollar bands for a typical medium-size, mid-range project ($90,000–$140,000).
- Design & Permits10% · $9k–$14k
- Foundation & Framing25% · $23k–$35k
- Roofing10% · $9k–$14k
- Electrical & Plumbing12% · $11k–$17k
- Interior Finishes23% · $21k–$32k
- Labor & Installation20% · $18k–$28k
What moves the number
Whether the addition ties into existing plumbing/electrical, matching the existing roofline, and foundation type.
Get the number for your project
These are the ranges. Your project has a number. Our free budget builder asks a few questions and gives you a line-item estimate from the same model — no sign-up to see it.
Common questions
How much does a room addition cost in the San Fernando Valley?
Most projects land between $90,000 and $140,000 for a medium-size, mid-range job. The full range runs from about $35,000 for a small, budget-tier project to $340,000 and up for a large, high-end one.
What is the most expensive part of a room addition?
Foundation & Framing — typically about 25% of the total project cost. Whether the addition ties into existing plumbing/electrical, matching the existing roofline, and foundation type.
Do these prices include permits?
Yes — every range here includes design and permitting, which typically runs 10% of the project. In the Valley, permit costs and timelines vary by city, which is one reason quotes for identical work can differ.
How do I get a real number for my project?
Use our free budget builder: answer a few questions about size, finish level, and scope, and it produces a line-item estimate for your specific project — the same model these ranges come from. No sign-up required to see your number.
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How these numbers are built
Ranges come from Vera Home’s line-item renovation cost model, calibrated to Los Angeles–area pricing for labor, materials, and permitting, and reviewed against real Valley project quotes. They are planning ranges, not bids: your contractor’s quote reflects your exact site, selections, and city permitting. Last reviewed 2026-08-03.