Best Base for a Hot Tub: Patio, Decking, or Concrete?

When investing in a hot tub, one of the most important decisions is where and how to install it. Choosing the right base ensures stability, safety, and long-term performance. Get it wrong, and you risk costly repairs, uneven settling, or even structural damage.

So, what’s the best base for a hot tub — patio, decking, or concrete? Let’s break down the pros and cons of each option to help you decide.

Why Your Hot Tub Base Matters

A filled hot tub can weigh over 1,500kg (that’s heavier than a car!). Without the right foundation:

• Your hot tub may sink or tilt over time
• Plumbing and electrics could become damaged
• Safety risks increase

That’s why a strong, level base is essential before installation.

Option 1: Patio Slabs

A popular and cost-effective choice, patio slabs provide a sturdy, non-slip surface.

Benefits

• Affordable and widely available
• Easy to lay or expand if needed
• Good drainage between slabs
• Visually blends with most gardens

Drawbacks

• Needs to be properly laid on hardcore to prevent sinking
• Gaps must be even — uneven slabs can cause pressure points
• May require re-levelling over time

Best For: Homeowners wanting a quick, attractive, and cost-effective solution.

Option 2: Decking

Decking creates a stylish, elevated look and can make your hot tub the centrepiece of your garden.

Benefits

• Aesthetic appeal — blends well with natural surroundings
• Can be raised for easy access
• Customisable design (integrated steps, seating, or planters)

Drawbacks

• Requires reinforced support — standard decking won’t hold the weight
• Needs ongoing maintenance (treating wood, preventing rot)
• Can become slippery when wet

Best For: Homeowners looking for a luxury, integrated design — provided the decking is professionally reinforced.

Option 3: Concrete Base

A concrete pad is the most durable and long-lasting option for hot tub foundations.

Benefits

• Strongest and most stable base
• Minimal maintenance
• Can be sized exactly to fit your hot tub
• Suitable for heavy models and long-term installations

Drawbacks

• More expensive than slabs or decking
• Permanent — difficult to remove or relocate
• Requires professional installation for best results

Best For: Long-term hot tub owners who want maximum stability and minimal upkeep.

Which Base Should You Choose?

• Patio slabs – Great all-rounder, affordable, and easy to set up.
• Decking – Stylish and functional, but only if reinforced.
• Concrete – The strongest, most reliable choice for permanent installations.

The “best” base depends on your budget, garden design, and how permanent you want your hot tub setup to be.

Need Help With Hot Tub Installation?

At Spafix, we don’t just service and repair hot tubs – we can also advise on installation and base preparation. If your hot tub isn’t sitting correctly or you’re planning a new installation, our experts can help ensure your spa is safe, stable, and ready for use. Simply get in touch today to discuss you hot tub needs.