Quick Answer
Call a professional for: engineered truss spans over 60 feet, sites with poor soil requiring engineering, barndominiums requiring code compliance, second stories, complex roof designs, and any situation beyond standard garage/workshop construction. DIY is appropriate for: standard 40-60 single-story buildings on good soil sites, basic workshops and storage, when following engineered plans, and with adequate helper support.
When to Call a Professional
Structural Engineering
- Snow loads over 70 psf
- Building width over 60 feet (clear span)
- Second story or loft with living space
- Poor soil conditions (expansive clay, high water table)
- Unusual roof designs (hip roofs, complex valleys)
Code Compliance
- Barndominium or living space conversion
- Commercial building
- Public use buildings
- Complex electrical/plumbing requirements
Specialized Trades
- Concrete finishing (large slabs)
- Electrical service installation
- Plumbing rough-in (especially septic)
- HVAC installation
Dangerous Work
- Large truss installation (40'+ spans)
- Roof work on steep pitches (10/12+)
- Work requiring specialized equipment (cranes, lifts)
DIY vs Professional Cost Comparison
| Task | DIY | Professional |
|---|---|---|
| Standard 40x60 pole barn | $20,000-28,000 | $30,000-42,000 |
| Concrete slab (pro) | $5,000-7,000 | $7,000-10,000 |
| Electrical rough-in | $2,000-4,000 | $3,500-6,000 |
| Truss installation (40' span) | DIY risky | $500-1,000 |
Common Questions
Q: Can I build a barndominium DIY?
A> You can DIY the shell, but professional help recommended for interior finishing, electrical, plumbing, and HVAC to meet code requirements.
Q>What's worth hiring out?
A> Concrete finishing, large truss installation, electrical service, and plumbing/septic installation. These require specialized skills and tools.
Sources
- Angi, "When to Hire a Contractor"
- HomeAdvisor, "DIY Limits"