How Much Does Room Addition Cost in Idaho?
Idaho pricing is near the national average. Updated for 2026.
Room Addition Pricing in Idaho
In Idaho, the average cost for room addition is $41,400 per project, which is 8% lower than the national average of $45,000. Most Idaho residents pay between $18,400 and $73,600.
Idaho has costs that track closely with the national average, though prices can still vary between urban and rural areas within the state.
A room addition extends your home's footprint by building a new room — bedroom, family room, home office, or in-law suite. It's one of the most expensive renovations but adds significant living space and value.
Idaho vs National Average
What Affects Room Addition Cost in Idaho?
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
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💡 Tips to Save on Room Addition in Idaho
- 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 Idaho Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $35,164 | — |
| 2021 | $36,641 | +4.2% |
| 2022 | $39,023 | +6.5% |
| 2023 | $40,116 | +2.8% |
| 2024 | $41,400 | +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 Idaho
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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.
Room Addition Cost in Other States
Related Cost Guides for Idaho
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