How to Pour a Concrete Slab for a Hot Tub

While installing a hot tub, one of the hardest parts is pouring the concrete slab. Here’s how to pour a concrete slab for your hot tub with some helpful tips on materials and tools.

A concrete slab for a hot tub is typically about 6 inches thick. However, this will vary depending on the size of the hot tub and how much weight it will hold. Read more in detail here: how thick should a concrete slab be to hold a hot tub.

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One of the most difficult aspects of purchasing a hot tub is deciding where to put it in your yard. A hot tub, which may weigh up to 6,000 pounds when full, needs a solid and stable base. Concrete slabs, on the other hand, are the ideal basis for your hot tub and are simple enough to pour yourself. 

You must first frame the space with wood planks before pouring a concrete slab. After securing them, dig six inches into the dirt. After that, pour the mixed concrete on top of the gravel. Screed the concrete to level it out, then let it cure.  

If you’re comfortable with concrete and power tools, or know someone who can assist you, pouring a concrete slab for your hot tub will be lot simpler. Though any rookie may do it on their own, pouring a slab is more difficult and should be done by two people.  



How to Pour a Hot Tub Concrete Slab


You can securely entertain guests if your hot tub has a solid base. If your hot tub is placed on an unstable surface, such as grass, it may sink or move, jeopardizing its security and making it hazardous to use. A concrete slab is a good choice since it can be custom designed to meet the size of your hot tub and it can handle a lot of weight. 

To begin pouring a concrete slab, you’ll need the following materials: 

  • Shovel
  • 2 x 4 wooden beams 
  • Stakes made of wood 
  • Concrete that has been pre-mixed 
  • Screws, 3 inch 
  • Saw (Electric)
  • Drilling with an electric drill 
  • a level and a tape measure

After you’ve prepped your equipment and supplies, it’s time to decide where you want your slab to go. Before you begin any job, check with your local building authority to see whether you need a permission. It’s also crucial to choose a level piece of ground to construct on. 

It’s time to get started once you’ve prepped your patch of land. To create a concrete slab for your hot tub, grab a buddy and follow these easy steps: 

  • Step 1: Mark the slab’s circumference with a stake. Hot tub slabs are typically less than 10 feet by 10 feet, but your selection should be based on the size of your hot tub and its location. Excavate the area but only to a depth of 4 to 6 inches, since a sturdy concrete slab needs solid soil underneath it to be stable.
  • Step 2: Measure and cut your wood beams to fit the area. Assemble them into a frame by screwing two Screws, 3 inch into every corner. The inside dimensions of your frame should match the exact size that you want your concrete slab to be. If the size is even slightly off, readjust your frame.  
  • Step 3: Secure the frame on the ground with Stakes made of wood to ensure it is stable and won’t move during the rest of the pouring process. Using your level, verify that the frame is even before you being to pour any wet cement. Double and triple check, as this step is crucial to a successful cement pour.  
  • Step 4: Dump a 1 to 2-inch layer of gravel or sand into the bottom of your frame. Now, prepare your Concrete that has been pre-mixed according to manufacturer instructions. Pour the mixture into the form, making sure to push the concrete into the corners and to tap along the edges to release air bubbles. 
  • Step 5: Screed and smooth the concrete surface with a 2-by-4 inch beam. As you proceed over the slab’s surface, slide it back and forth to remove extra wet concrete and guarantee a flat finish. 
  • Step 6: Now comes the fun part: sit back and relax while the concrete dries! To guarantee that your hot tub is dry and sturdy, wait at least two days before removing the frame and another 28 days before placing it on the slab. 

What is the Best Place for a Concrete Slab?

It might be more challenging to decide where to put your hot tub and concrete slab than it is to actually pour the concrete. It’s crucial to remember that situating the hot tub too near or too far away from your home might cause issues. It’s also crucial to think about how flat a section of land is before making a decision, since uneven terrain would need more labor.


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One of the most crucial components of deciding where to put your slab is to choose an area with a decent drainage system. You’ll have to maintain your jacuzzi on a regular basis, including emptying and cleaning it a few times a year. Overflow from use is also a prevalent occurrence. Place your hot tub near a drain or, if necessary, build one. 

When deciding where to put your hot tub or slab, keep in mind that it should not be too near to your house. The steam and moisture from the tub might leak into the windows and walls, causing mildew and rot to grow. Make sure it’s at least 12 feet from any overhead wire, telephone lines, or light fixtures. 

Keep in mind that situating it too far away has its own drawbacks, the most apparent of which is that if you live in a colder climate, you may not be able to use your hot tub at all. You should also think about where your hot tub will obtain its electricity; situating it too far away from your home may restrict your choices and make powering it more difficult.

The location of your concrete slab is critical to the success of your hot tub installation and to maximizing your pleasure and relaxation. To guarantee the safety of your equipment and the location of your tub, you should always get expert advice from your local building authority. 

Concrete Foundation Preparation 

It’s critical to prepare the ground for a concrete pour after you’ve picked a location and before you start pouring your concrete. Visually check the area for holes or lumps to do so. Fill up holes and level the ground with a shovel and hoe if required before pouring. 

It’s also crucial to keep an eye out for tree roots, both underground and above ground, as well as huge rocks. They may wreak havoc on the ground’s stability and evenness, causing severe issues with the pouring of your slab and the installation of your hot tub. Before pouring, avoid areas with tree roots and remove any big stones. Even if your concrete is uneven, there is a technique to get your hot tub to sit level.


A concrete slab is a great place to put your hot tub. A slab can easily handle the weight of your jacuzzi and visitors, is watertight, and may be created to your precise specifications. If you know what you’re doing, pouring a slab is also inexpensive and simple. 

It’s critical to be exact with your measurements while constructing a concrete slab, particularly when constructing the slab’s structure. Pouring concrete correctly also requires precisely estimating your excavation depth and the quantity of gravel or sand you lay in the frame’s foundation. 

Overall, with the assistance of a buddy, pouring a slab of concrete may be done in a few hours. It is more sturdy than a deck or grass, and it will withstand regular wear and tear well. What are you waiting for? It’s low-maintenance and won’t break the budget, so what are you waiting for? One concrete slab separates you from your new hot tub paradise. 

There are many different types of hot tubs to select from, but if you’re looking for something more economical, check out our list of the best inflatable hot tubs we could discover!


The “prefabricated hot tub base” is a concrete slab that has been poured over a steel frame. The slab is then filled with water and the frame will support it.

Frequently Asked Questions

How thick does a concrete slab need to be for a hot tub?

A: The thickness of a concrete slab depends on the size and weight of your hot tub. That said, I would recommend that you consult an expert in this area to ensure that the weight will not cause significant cracking or failure over time.

How do you build a concrete slab for a hot tub?

A: You may want to contact a concrete contractor in order to consult with them and give you the best advice.

How much does it cost to pour a concrete slab for a hot tub?

A: This is a question about the cost for pouring concrete to build a hot tub. If you are looking to pour in your own natural spring, this would be considered an in person job and likely would vary depending on where it is located.

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