Sherman Oaks, CA · San Fernando Valley, West
Room addition prices in Sherman Oaks, CA: 2026 ranges
A room addition in Sherman Oaks costs $355–$710 per sq ft, with a typical mid-size room addition running $130k–$260k. Small projects start around $59k; large or high-end work can reach $472k or more.
As of 2026, costs in Sherman Oaks run about 18% above the LA County baseline due to hillside lots south of the 101 and heavy remodel demand.
Updated
Room Addition Cost by Size in Sherman Oaks
Totals adjusted for the Sherman Oaks market (1.18× LA County baseline). Ranges include labor, materials, permits, and contractor overhead.
| Size | Type | Range | Low | High |
|---|---|---|---|---|
| Small | Bump-out / single room | 150–250 sq ft | $59k | $130k |
| Medium | Suite addition | 300–500 sq ft | $130k | $260k |
| Large | Second story / multi-room | 600+ sq ft | $236k | $472k |
What Affects Room Addition Cost in Sherman Oaks?
- Foundation type.
- Roofline integration.
- MEP (mechanical/electrical/plumbing) extension.
- Permits.
- Soil condition.
- Sherman Oaks market premium: local pricing reflects hillside lots south of the 101 and heavy remodel demand, which shifts totals about 18% above the LA County baseline.
Get exact room addition bids in Sherman Oaks
Two or three licensed builders who work in Sherman Oaks, pricing the same scope.
Room Addition Sub-Type Comparisons
Bedroom Addition vs Master Suite Addition
A standard bedroom addition runs $50k–$110k; a master suite (bedroom + bath + walk-in closet) doubles the plumbing scope and lands at $110k–$220k.
Second Story Addition vs Sunroom Addition
Second-story additions require foundation reinforcement and full re-roof at $200k–$400k; sunrooms (prefab or stick-built) skip much of the structural work at $30k–$90k.
How to Get the Best Price on a Room Addition in Sherman Oaks
- Get line-itemized bids from two or three builders on the same scope; Sherman Oaks room addition pricing commonly varies 10–25% between contractors.
- Lock major materials and finishes before signing; mid-project change orders are the #1 cost driver on room addition jobs.
- Bid in shoulder seasons (Jan–Mar or Sep–Oct) when Sherman Oaks contractor schedules are open and rush premiums disappear.
- Verify CSLB license, insurance, and bond before paying any deposit. California caps deposits at $1,000 or 10% of contract, whichever is less.
What is a room addition?
A room addition adds conditioned square footage to a house: a bedroom, a primary suite, a family room or a second story. It needs foundation or framing work, a roof tie-in, and extended electrical, plumbing and HVAC.
How to get an accurate price
- 1.Write down the scope: size, any layout changes, the finish level, and who supplies fixtures and materials.
- 2.Get bids from two or three licensed builders who work in Sherman Oaks, all pricing that same room addition scope.
- 3.Line the bids up item by item. Check allowances, permits, exclusions, and whether overhead and profit are shown.
- 4.Before any deposit, check each builder's CSLB license and insurance. As of 2026, California caps a home improvement down payment at $1,000 or 10% of the contract, whichever is less, according to the Contractors State License Board.
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Questions about Room Addition in Sherman Oaks
How much does a room addition cost in Sherman Oaks, CA?
A room addition in Sherman Oaks costs $59k–$472k, with a typical mid-size room addition running $130k–$260k. Per-unit pricing falls in the $355–$710 per sq ft range.
Do I need a permit for a room addition in Sherman Oaks?
Yes for most scopes — LADBS or the local city building department requires permits any time you move plumbing, gas, electrical, or alter structure. Like-for-like cosmetic refreshes generally don't.
How long does a room addition take in Sherman Oaks?
Plan for 4–14 weeks of construction in Sherman Oaks depending on size and complexity, plus 2–8 weeks for design, permits, and material lead times.
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Get Matched with Licensed Sherman Oaks Contractors
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