Cost to Second Story Addition in San Diego, CA (2026)
If you’re budgeting a second story addition in San Diego, most projects run $117,600-$352,800, 18% above the $175,000 national average. What moves that number most is usually one thing: Foundation and First-Floor Capacity. On its own it can swing the cost by $10,000 - $60,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Commission a structural engineering report ($500-$1,500) before finalizing your budget. Foundation issues discovered mid-project are far more expensive than catching them upfront.
$117,600-$352,800 in San Diego
18% above the national average · 1.18x cost multiplier
Expect to pay $117,600-$352,800 for a second story addition in San Diego, about 18% above the national benchmark. The West Coast region's contractor market and material costs account for most of this difference. The detailed breakdown below shows how budget, mid-range, and premium projects compare at San Diego prices.
Cost Breakdown in San Diego
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per sq ft | $176 | $294 | $470 |
| Materials | $47,000 | $88,125 | $164,500 |
| Labor | $58,859 | $100,060 | $164,805 |
| Permits | $5,875 | $9,400 | $14,100 |
| Design | $8,225 | $14,100 | $29,375 |
| Total | $119,959+18% vs. national avg | $211,685+18% vs. national avg | $372,780+18% vs. national avg |
Budget
Full second story over a 1,000 sq ft footprint with standard materials, vinyl siding, builder-grade windows, and basic finishes. Minimal interior customization.
Mid-Range
1,200 sq ft second story with mid-grade finishes, fiber cement siding, energy-efficient windows, 3 bedrooms, 2 bathrooms, and dedicated HVAC system.
Premium
1,500+ sq ft second floor with custom architectural design, premium finishes, vaulted ceilings, master suite with luxury bath, and full structural engineering.
Material Options
Material prices below are national averages; availability in San Diego may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Wood Frame with Vinyl Siding | $150-$200 per sq ft | Budget-conscious projects on homes that already have vinyl sidingMost affordable construction method, fast framing, widely available contractors |
| Wood Frame with Fiber Cement Siding | $200-$280 per sq ft | Mid-range additions where exterior quality and longevity matterDurable, paintable, low maintenance, matches most existing home styles, fire-resistant |
| Wood Frame with Brick Veneer | $250-$350 per sq ft | Brick ranch homes where matching the exterior is critical for resaleExcellent curb appeal, matches brick first floors seamlessly, very durable |
| Structural Insulated Panels (SIPs) | $220-$320 per sq ft | Energy-conscious homeowners in climate extremes who want long-term utility savingsSuperior insulation, faster framing, energy-efficient, airtight construction |
| Modular / Prefab Second Story | $130-$220 per sq ft | Straightforward rectangular footprints where speed and cost control are prioritiesFactory-built sections reduce on-site time, weather exposure, and labor costs |
Other Projects in San Diego
San Diego Estimate
Typical Range
$117,600-$352,800
vs. National Average
18% above national
Cost Multiplier
1.18x
Cost Per sq ft
$176-$470
This 1.18x estimate prices San Diego labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →