🌲 Deck Calculator
Calculate joists, decking, beams, and footings for wood and composite decks.
Enter Deck Specifications
Deck Building Guide
📏 Standard Sizes
| Dimension | Common |
|---|---|
| Deck board length | 12', 16', 20' |
| Joist spacing (wood) | 16" OC |
| Joist spacing (composite) | 16-24" OC |
| Post spacing | 6-8 ft |
🪵 Material Comparison
| Material | Cost | Maintenance |
|---|---|---|
| Pressure-treated | $ | Annual |
| Cedar | $$ | Annual |
| Composite | $$$ | Minimal |
⚠️ Building Code Notes
- Permit required for decks > 24" high
- Footings must be 48" deep (frost line)
- Railings required for decks > 24" high
- Joist hangers required - no toenailing
- Engineering may be needed for large decks
✅ Construction Steps
- Call for utility locates
- Install footings below frost line
- Set posts with post anchors
- Install beams and rim joists
- Hang joists with joist hangers
- Install decking boards
- Add railings and stairs