Installing an above ground pool can be an exciting way to add value, fun, and relaxation to your backyard. However, the process is more complex than many homeowners realize. Making the wrong choices during installation can lead to costly repairs, safety hazards, and even premature pool replacement. In this comprehensive guide, we’ll walk through the most critical mistakes people make when setting up above ground pools—and how to avoid them—so you can enjoy a smooth installation and worry-free summer.
Whether you’re a DIY enthusiast or hiring professionals, understanding what not to do when installing an above ground pool is essential for long-term success. Each mistake covered below comes with practical advice and expert insight to guide your project in the right direction.
1. Skipping the Planning Phase
Planning is the foundation of any successful project, and above ground pool installation is no exception. Many people rush into purchasing a pool only to discover later that they haven’t considered key elements like local zoning laws, available space, and equipment needs.
Avoid: Not Checking Local Building Codes
Failing to check city or county regulations can result in penalties or having to dismantle a perfectly good pool. Some municipalities require permits for above ground pools, especially if they exceed a certain depth or height.
Avoid: Neglecting a Site Assessment
Before installation, ensure the ground is level, stable, and free of obstructions like tree roots, rocks, or underground utilities. Sloped or uneven terrain can lead to poor water circulation, structural stress, and leaks.
Tips for Proper Planning:
- Call 811 before digging to locate any underground lines.
- Verify setback requirements from property lines.
- Create a written plan that includes the pool’s location, dimensions, and equipment layout.
2. Improper Site Preparation
One of the most overlooked aspects of above ground pool installation is site preparation. It’s not just about leveling the ground—it’s about creating a solid foundation to support the structure and water weight.
Avoid: Using Grass or Uneven Ground as a Base
Many people think they can place their pool directly on grass, but this can lead to sinking, instability, and premature rusting of the pool wall. Plus, an uneven base may cause the pool frame to warp over time.
Avoid: Overlooking Drainage Needs
If water pools around your pool after heavy rain, it can erode the foundation and compromise structural integrity. Always ensure the surrounding area has proper drainage to steer water away from the base.
Recommended Base Options:
| Base Material | Pros | Cons |
|---|---|---|
| Sand | Soft, easy to spread, and forgiving | May shift over time; requires leveling |
| Concrete Pad | Durable, long-lasting, and very stable | Expensive and time-consuming to install |
| Pool Padding | Cushions the liner, reduces wear | Not a substitute for a proper base; requires an underlayment |
3. Choosing the Wrong Location
The location of your above ground pool affects aesthetics, safety, maintenance, and your ability to enjoy the space.
Avoid: Placing the Pool Too Close to Trees or Vegetation
While shade might seem attractive, falling leaves and branches will constantly dirty the water. Moreover, roots can push up through the base and damage the liner or supporting wall.
Avoid: Installing Too Close to Structures
Placing the pool next to a fence, shed, or house can limit accessibility and pose safety hazards. It also makes it harder to maintain proper water circulation and filtration.
Ideal Placement Guidelines:
- At least 10 feet from property lines
- Clear of overhead obstructions
- Within reach of a power source
4. Installing on a Sloped Yard Without Modifications
Even a slight slope can wreak havoc on an above ground pool. Unlike in-ground pools, above ground models are not designed to compensate for grade changes without extensive engineering.
Avoid: Trying to “Shim” One Side Up
Some DIYers attempt to level a pool by building up the low side with blocks or fill dirt. This often leads to an unstable base and uneven pressure on the pool walls.
Avoid: Underestimating Excavation Needs
Correcting a slope usually means removing earth on one side and building it up on the other. But without proper compaction, the soil can settle unevenly, causing the pool to tilt over time.
Best Practices for Sloped Yards:
- Consult a landscaping or pool professional.
- Use a laser level or contractor services to ensure accurate grading.
- Reinforce the base with gravel or crushed stone to prevent shifting.
5. Using the Wrong Pool Size for Your Yard
Just because a pool fits dimensionally doesn’t mean it’s the right fit. The wrong size can cause usability issues or become an eyesore.
Avoid: Oversizing the Pool
A large pool in a small backyard can feel cramped and leave no room for lounging or entertaining. It can also decrease the home’s resale value if outdoor space is sacrificed.
Avoid: Undersizing for Your Needs
On the flip side, a pool that’s too small might not accommodate your family’s needs, leading to frustration and under-use.
How to Choose the Right Size:
- Measure your space and mark the footprint with stakes and string.
- Consider how many people will regularly use the pool.
- Factor in additional items like ladders, filters, and deck space.
6. Installing Without Safety Considerations
Above ground pools may seem safer than in-ground pools, but they still pose significant risks if not installed or used properly.
Avoid: Neglecting Safety Fencing
Many localities now require above ground pools to have barriers or fences if the pool height is under 4 feet. Even if not required, fencing is a best practice to keep children and pets out unsupervised.
Avoid: Forgetting Ladder and Entry Safety
A poorly installed or missing pool ladder can lead to accidents. Make sure any steps or ladders are secure, non-slip, and placed where users can enter and exit easily.
Safety Features to Consider:
- Pool alarm systems
- Cover locks or automated safety covers
- Guardrails and gates with self-closing hinges
7. Cutting Corners on Pool Liners
The liner is the most vulnerable component of an above ground pool. Quality and care during installation can dramatically affect its lifespan and your enjoyment.
Avoid: Using a Thin or Inexpensive Liner
Cheaper liners are more prone to tears, fading, and punctures. They also tend to wrinkle when installed improperly, which can cause water imbalance and difficulty maintaining clarity.
Avoid: Installing the Liner in Extreme Weather
Cold weather causes vinyl to stiffen, which can lead to improper stretching and creasing. On the other hand, hot weather may cause premature stretching, creating slack once temperatures drop.
Linerting Liner Installation Tips:
- Warm the liner in sunlight before installation.
- Ensure the base is smooth, clean, and void of sharp objects.
- Follow manufacturer instructions for stretching and securing.
8. Skipping Proper Ground Leveling
Leveling the ground beneath your above ground pool may appear straightforward, but small mistakes can compound quickly under the weight of over 15,000 pounds of water.
Avoid: Using Hand Tools Only
While a shovel and rake can work for small areas, achieving a truly level base often requires a heavy roller, plate compactor, or laser level.
Avoid: Not Re-Checking After Setup
Sometimes the base appears level, but once the pool is in place—and water is added—the ground can shift. Rechecking the level after the pool is partially filled is essential to catch issues early.
Ground Leveling Checklist:
- Clear all sod, rocks, and debris
- Add 1–2 inches of coarse sand or crushed stone
- Compact the surface thoroughly
9. Ignoring Electrical and Plumbing Requirements
While above ground pools don’t require the kind of plumbing that in-ground models do, proper installation of electrical components and filter systems is crucial.
Avoid: Using Extension Cords
Outdoor extension cords can overheat or become damaged, posing serious fire or electrocution hazards. It’s best to install a dedicated grounded GFCI outlet near the pool for the filter and pump.
Avoid: Improper Filter and Pump Sizing
Using a filter or pump that’s too small for your pool’s capacity will lead to poor water quality and increased maintenance. Oversized equipment, on the other hand, wastes energy and money.
Electrical and Plumbing Suggestions:
- Hire a licensed electrician to install outdoor outlets.
- Choose a filter that turns over the entire pool volume every 6–8 hours.
- Use flexible hoses and ensure all connections are secure and leak-proof.
10. Relying on Incorrect Installation Instructions
Many pool owners follow DIY guides or videos they find online, often produced by amateur installers with little or no official experience.
Avoid: Ignoring Manufacturer Guidelines
Manufacturer instructions are specifically tailored to your model’s design. Deviating without understanding structural or engineering implications can void warranties and create dangerous situations.
Avoid: Using Generic Installer “Tips”
Some videos suggest short-cuts or alternative approaches that might seem clever but don’t address long-term stability or safety. For example, trying to place a sand base directly onto clay soil can cause moisture retention that prematurely ages the liner.
Best Practices for Instruction Use:
- Compare the manual with online reviews and forums for clarity.
- Watch official tutorial videos from the brand.
- Consider hiring a professional if instructions are unclear.
11. Not Considering Seasonal Removal and Winterization
The long-term viability of your above ground pool depends as much on maintenance as it does on installation.
Avoid: Leaving the Pool Fully Assembled Year-Round
In colder climates, failing to properly winterize or disassemble the pool can lead to cracking pipes, torn liners, and collapsed walls due to ice expansion.
Avoid: Draining and Refilling Improperly
Repeated dewatering without full disassembly can trap moisture, leading to mold, corrosion, or damage when freezing occurs.
Winterization Tips:
- Drain water below skimmer level.
- Add winterizing chemicals to protect the liner.
- Cover with a tight-fitting, UV-protected pool cover.
12. Overlooking Water Chemistry from Day One
While not directly an installation mistake, many new pool owners don’t understand water chemistry basics, leading to unnecessary damage and costly corrections.
Avoid: Not Testing Water Before Swimming
Balanced water is essential to prevent liner damage and protect users’ skin and eyes. Test for chlorine, pH, alkalinity, and calcium hardness at least once a week, especially after installation.
Avoid: Under-Treating New Water
New pool water needs to be properly shocked and sanitized. Failing to do so can result in algae growth and bacterial issues from the start.
Water Testing Essentials:
- Use test strips or a digital tester
- Aim for pH between 7.4–7.6
- Chlorine should be between 1–3 ppm
Conclusion: Get It Right the First Time
Knowing what not to do when installing an above ground pool is just as important as knowing what to do. From poor site selection to skipping base preparation, each mistake outlined above can result in anything from inconvenient repairs to a total structural failure of your investment.
By avoiding common installation missteps and ensuring proper planning, site prep, and professional advice where necessary, you lay the groundwork for years of enjoyment and trouble-free swimming. Take the time upfront to research, hire quality help if needed, and follow all manufacturer guidelines.
An above ground pool should be a source of relaxation—not frustration. Approach your installation with care, and your backyard will transform into a perfect oasis, season after season.
If you’re planning to buy a pool or have recently done so, refer back to this article often. By staying informed and proactive, you’ll ensure a clean, safe, and enjoyable pool experience for your family and friends.
Should I install my above ground pool on an existing lawn or garden area?
Installing an above ground pool directly on existing grass or garden soil is a common mistake that can lead to serious issues with the pool’s stability and longevity. Uneven ground, roots, and poor drainage can compromise the pool’s structure, resulting in damage to the liner, frame, and overall integrity. Pests and weeds may also become a problem, and removing grass after the fact can be messy and labor-intensive.
Instead, it’s best to clear the area completely and create a smooth, level base using materials like sand, gravel, or a specialized pool pad. Proper preparation ensures better weight distribution and protects the pool’s floor from punctures and wear. Take the time to test the ground for levelness before placing the pool, and invest in quality base materials—this will save you from repairs or premature replacement later on.
Is it okay to skip using a ground cloth or liner protector beneath the pool?
Skipping the use of a ground cloth or liner protector is a mistake that many pool owners regret. Without this protective layer, the pool liner is vulnerable to abrasions caused by rocks, sticks, and rough surfaces on the ground. These damages can lead to tears and leaks, which are not only costly to repair, but may entirely compromise your pool experience.
A high-quality underlayment acts as a buffer, absorbing pressure and minimizing the risk of damage from uneven or sharp surfaces. Look for a heavy-duty, non-woven underlayment that is specifically designed for pool use. It should cover the entire footprint of the pool to provide complete protection, even in the corners and along the edges.
Can I build my pool on a slope to save time or space?
Building an above ground pool on a slope may seem like a time- or space-saving idea, but it presents serious functional and safety concerns. The slope will make it difficult to level the pool, which can cause the structure to become unstable. Uneven water pressure against the pool walls can lead to warping, bending, or even collapse over time.
If the terrain isn’t completely flat, it’s important to take the time to level the area properly before installing the pool. This might involve removing soil from high areas or adding fill material to low spots. In severe cases, consider terracing or adjusting the pool’s placement. Investing in a level setup is crucial for safety and long-term enjoyment.
Is it safe to ignore the manufacturer’s instructions and spacing requirements?
Ignoring the manufacturer’s instructions and spacing requirements is a risky decision that can void warranties and compromise the structural safety of your pool. Manufacturers provide these guidelines to ensure the pool functions correctly under various environmental conditions. Failure to follow them—such as placing the pool too close to a building or tree—can result in collapse, difficulty with repairs, or unnecessary wear and tear.
Additionally, keeping your pool too close to a structure like a house or fence can restrict airflow and prevent proper water circulation, increasing the risk of mold and algae growth. Always leave enough room around the pool for maintenance access, and follow any specific recommendations regarding nearby obstructions like trees, fences, or sheds.
Can I skip installing a skimmer or filter system if I only plan to use the pool occasionally?
Skipping the skimmer and filter system because you only use the pool occasionally is a mistake that can lead to serious water quality and maintenance problems. Without proper circulation and filtration, debris accumulates quickly, inviting algae growth and bacterial buildup. This not only makes the pool unsanitary but also much more time-consuming and expensive to clean when you do want to use it.
Even for seasonal or casual use, a basic filter and skimmer system is necessary for maintaining a clean, healthy, and usable environment. These systems help prevent stagnant water and ensure the chemical balance is maintained, reducing the need for constant manual cleaning. Investing in proper pool filtration is one of the best decisions you can make for long-term pool care.
Is it okay to overfill the pool slightly to ensure it’s ready for use during hot weather?
Overfilling the pool might seem like a harmless time-saver, especially during peak summer use, but it can cause serious structural issues. Excess water increases pressure on the pool walls, which may lead to bowing or bending, particularly if the pool frame was not designed to withstand higher-than-recommended water levels. This can compromise both the safety and durability of the installation.
It’s also important to consider potential water expansion due to temperature changes and splash-out from users. These factors naturally reduce water levels, so manufacturers typically design pools for optimal water capacity to account for them. To prevent undue stress on the pool structure, always fill up to the recommended level, and check regularly to maintain proper levels throughout the season.
Can I install my pool near a septic system or underground utility line as long as I don’t dig?
Installing a pool near a septic system or underground utility line—whether you dig or not—can be dangerous and may violate local building codes. Even if installation doesn’t disrupt the lines directly, the added weight and pressure of the filled pool could damage underground pipes or tanks over time, leading to costly repairs and hazardous leaks.
Before choosing a site, call your local utility or use a service like “Call Before You Dig” to locate all underground lines and septic tanks. Maintaining adequate clearance allows for both easier maintenance access and long-term stability of your pool. It’s always better to relocate your pool site than risk violating safety regulations or damaging hidden underground infrastructure.