Room Addition Cost in Long Beach, CA (2026)
A room addition in Long Beach costs $285–$570 per sq ft, with a typical mid-size room addition running $105k–$209k. Small projects start around $48k; large or high-end work can reach $380k or more.
Costs in Long Beach run about 5% below the LA County baseline thanks to older housing stock and coastal exposure on materials.
Room Addition Cost by Size in Long Beach
Totals adjusted for the Long Beach market (0.95× 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 | $48k | $105k |
| Medium | Suite addition | 300–500 sq ft | $105k | $209k |
| Large | Second story / multi-room | 600+ sq ft | $190k | $380k |
What Affects Room Addition Cost in Long Beach?
- Foundation type.
- Roofline integration.
- MEP (mechanical/electrical/plumbing) extension.
- Permits.
- Soil condition.
- Long Beach market premium: local pricing reflects older housing stock and coastal exposure on materials, which shifts totals about 5% below the LA County baseline.
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Get MatchedRoom 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 Long Beach
- Get 3 line-itemized bids on the same scope through Keystone Connect — Long Beach room addition pricing 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 Long Beach 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.
Frequently Asked Questions — Room Addition in Long Beach
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