Putting a hot tub directly on grass is possible, but it’s generally not recommended. There are a few issues to consider before placing a hot tub on a grassy area.
Page Contents
Weight and Settling
Hot tubs are very heavy, often weighing over 1,000 pounds when filled with water. All of this weight placed directly on grass will cause the ground underneath to settle and become uneven over time. This can lead to structural damage to the hot tub shell. Placing the hot tub on a solid foundation can prevent settling issues.
Moisture and Rot
The hot, damp environment underneath and around a hot tub can cause grass and the soil beneath it to rot away. Exposed dirt is unsightly and allows weeds to propagate. A proper foundation or pad keeps the hot tub up off the grass and helps moisture dissipate rather than pooling beneath the tub.
Level Installation
For proper operation and safety, a hot tub must be completely level during installation. A grassy area likely has dips, hills, and uneven spots that would make leveling the tub difficult. A level concrete slab makes placement and setup much easier.
Decking
Many homeowners build a raised wood deck around their hot tub, both for appearance and ease of access. Building this deck is easiest on a flat surface. Grass would need to be dug out and replaced with gravel to create a solid base for the deck supports.
Ongoing Maintenance
A hot tub placed right on soil or grass will need frequent maintenance to keep the area looking nice. The area beneath may become muddy and puddles may form, requiring vigilance to keep things tidy. It’s much easier to keep the hot tub area clean when it’s placed on a patio or concrete pad.
Steps for Placing a Hot Tub on Grass
If you must place your hot tub on a grassy area, either temporarily or permanently, here are some tips to make it as safe and tidy as possible:
Select a Level Site
Survey the area thoroughly and select the flattest, most level spot possible. Use a leveling tool to ensure it is even.
Install Solid Footings
Place concrete paver stones, bricks, or footings beneath the hot tub base to prevent settling and distribute the weight.
Use Gravel Fill
Spread gravel to create a flat, stable subsurface and facilitate drainage under and around the hot tub.
Keep it Portable
For temporary placement, choose an inflatable or portable hot tub model that can be emptied and moved easily.
Protect the Tub
Keep the hot tub insulation from direct ground contact to help prevent moisture damage.
Check Level Frequently
Monitor for signs of settling and make adjustments to keep the hot tub level.
Add Decking
Consider framing a raised wood deck around the spa for better access and appearance.
Advantages of Placing a Hot Tub on Grass
Despite the potential drawbacks, there are a few advantages to placing a hot tub directly on the grass:
Low Cost
Avoid the expense of installing a concrete pad or paver patio for the hot tub base.
Mobility
An inflatable or lightweight portable hot tub can be moved around the grassy area to change things up.
Preserves Yard Space
You don’t have to sacrifice a patio or paved area to make room for the hot tub.
No Permits Needed
May not need permits compared to building a permanent foundation.
Natural Aesthetic
Blends in with the natural scenery of a yard space, rather than appearing as a fixed structure.
Key Considerations
When deciding whether to place a hot tub on grass, keep these key factors in mind:
| Consideration | Grass | Concrete Pad |
|---|---|---|
| Cost | Lower | Higher |
| Permits Required | Typically No | Yes |
| Appearance | Natural | Structured |
| Accessibility | More Difficult | Easier |
| Ongoing Maintenance | Higher | Lower |
| Permanence | Temporary | Permanent |
Best Practices
Follow these best practices when installing a hot tub on grass:
- Construct a level gravel or crushed stone base
- Use concrete pavers or footings under the tub for support
- Keep insulation from direct ground contact
- Check for level and stability frequently
- Control runoff and drainage around the hot tub
- Maintain a border of gravel around the tub perimeter
- Watch for signs of settling and shifting
- Consider framing a raised deck around the tub
Conclusion
Placing a hot tub directly on grass is possible but has some drawbacks compared to installing on a concrete pad. With careful preparation to create a stable, level base and ongoing maintenance to control moisture, a grass installation can work temporarily or for the long-term. However, a concrete foundation remains the best option for support, convenience and appearance. Consider both the advantages and disadvantages carefully before deciding where to locate your hot tub.