How Much Does Room Addition Cost in Modesto, CA?
Modesto pricing is near the national average. Updated for 2026.
Based on local labor rates, varied climate conditions, and Modesto's diversified economy.See our methodology
Room Addition Pricing in Modesto, CA
In Modesto, room addition costs are 5% above the national average, reflecting the city's diversified-driven economy. The balanced labor market means you have decent options when shopping for quotes. Most residents with a population base of 215K find the pricing competitive relative to the local cost of living.
Local climate plays a direct role in room addition costs here. Varied climate depending on location; earthquake considerations in some areas.
Market-specific factors matter in Modesto: higher cost of living in coastal areas; more affordable inland.
Modesto has moderate permitting requirements. Depending on the scope of your room addition project, you may need local permits. A licensed contractor will handle the permitting process as part of the job in most cases.
Modesto vs National Average
What Affects Room Addition Cost in Modesto?
Size
Small (100 sq ft): $15,000-$25,000. Average (200 sq ft): $30,000-$50,000. Large (400+ sq ft): $60,000-$100,000+
Room Type
Basic bedroom: $20,000-$40,000. Bedroom + bathroom: $35,000-$65,000. In-law suite: $50,000-$100,000+
Per Sq Ft
Budget: $80-$150/sq ft. Mid-range: $150-$250/sq ft. High-end: $250-$400+/sq ft
Modesto Market Conditions
higher cost of living in coastal areas; more affordable inland
Local Climate Impact
varied climate depending on location; earthquake considerations in some areas
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Tips to Save on Room Addition in Modesto
- 1.A bump-out (extending an existing room 2-4 feet) costs $5,000-$15,000 — much less than a full addition
- 2.Building over an existing garage or patio saves on foundation costs
- 3.A dormer addition (expanding attic space) costs 30-50% less than a ground-floor addition
- 4.Act as your own general contractor if you have experience — save 15-25% on management fees
📈 Room Addition in Modesto Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $40,134 | — |
| 2021 | $41,820 | +4.2% |
| 2022 | $44,538 | +6.5% |
| 2023 | $45,785 | +2.8% |
| 2024 | $47,250 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for Room Addition in Modesto
Recent Reports
Frequently Asked Questions
Does a room addition increase home value?
Yes, though ROI varies: 50-65% for a standard room addition, 60-75% for a bedroom + bathroom addition. The value also depends on whether the addition fits the neighborhood — over-improving for your area yields lower returns.
How long does a room addition take?
Typical timeline: 2-4 weeks for permits and planning. 8-16 weeks for construction. Total: 3-5 months. Complex additions with full bathrooms or custom features can take 6-12 months.
Why does room addition cost different in Modesto than other cities?
Modesto's costs reflect local labor rates driven by the diversified economy, varied climate conditions that affect materials and scheduling, and moderate permitting requirements. The balanced labor market also influences competitive pricing.
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