Transforming a backyard into a personal paradise is an exciting prospect for many homeowners. This report explores the ambitious endeavor of constructing a DIY underground pool and waterslide, uniquely integrated with a whimsical hidden watermelon house. This combination promises a blend of recreational enjoyment, aesthetic appeal, and imaginative design, creating a backyard unlike any other. The journey to realize such a project involves careful consideration of feasibility, costs, construction methods, safety protocols, regulatory requirements, and creative design strategies. This report aims to provide a comprehensive overview of these aspects, drawing upon available research to inform and guide those considering such an undertaking.
Embarking on the creation of a DIY underground pool represents a significant investment of both time and financial resources. Understanding the typical costs associated with inground pools provides a necessary baseline, even when considering a do-it-yourself approach. On average, professional installation of an inground pool can cost around $65,000, with the total expenditure ranging from a lower end of $25,000 to well over $100,000. This variation is influenced by factors such as the pool’s size, the materials used in its construction, and any special design features incorporated. It is important to note that these figures generally encompass the costs of both materials and the labor involved in the installation. The allure of a DIY approach lies in the potential for cost savings, with estimates suggesting that homeowners might save between 20% and 40% on labor expenses by undertaking the project themselves. However, these potential savings must be carefully balanced against the increased time commitment, the possibility of errors occurring without professional expertise, and the necessity of renting or purchasing specialized equipment required for certain aspects of the construction. Regional differences in the cost of pool installation also play a significant role. For example, the average cost to install an inground pool in Vermont can range from $52,000 to $79,000, while in Alabama, the range might be $34,000 to $55,000. These variations highlight the importance of researching local market conditions when planning a pool project.
Several key factors contribute to the overall cost of a DIY underground pool. The size of the pool is a primary determinant, with larger pools requiring more materials and labor, thus increasing the expense. For instance, a smaller 10×20 ft. pool might cost in the range of $10,000 to $25,000, while a larger 20×40 ft. pool could range from $40,000 to $100,000. The cost per square foot for pool installation can also vary considerably, from approximately $90 to $250, depending on the complexity of the design and the materials selected. The choice of materials for the pool shell itself is another critical cost factor. Vinyl liner pools are generally the most affordable option, with installation costs ranging from $20,000 to $40,000 or $25,000 to $65,000 , and a DIY build could potentially fall within the $25,000 to $40,000 range. Basic vinyl liner pool kits can be found starting at around $5,000. However, vinyl liners have a limited lifespan, typically around 10 years, and replacing a liner can cost an additional $5,000 to $7,000. Fiberglass pools offer a mid-range cost, with installation typically ranging from $20,000 to $85,000 or $30,000 to $85,000 , potentially reaching $55,000 to $100,000. While durable, with a lifespan of about 25 years, fiberglass pools are pre-manufactured, limiting customization options. DIY installation can lead to savings, but it often requires specialized equipment like a crane. Concrete or gunite pools are the most expensive option, with installation costs ranging from $35,000 to $120,000 or $50,000 to $120,000 and potentially exceeding $65,000 to $120,000 or even $95,000. These pools offer exceptional durability, with a lifespan of 50 to 100 years, and allow for complete customization. However, DIY construction is significantly more complex and often requires specialized skills in concrete work.
Beyond the basic pool structure and excavation, numerous additional expenses can contribute to the overall cost. These include permits, which can range from $100 to $1,800 , $450 to $1,800 , or $500 to $2,000 , depending on the locality. Decking around the pool can cost anywhere from $3,000 to $20,000 , or $5 to $50 per square foot, depending on the material. Fencing, often required for safety, can add another $1,500 to $10,000 , or $15 to $25 per linear foot. A pool cover, essential for safety and maintenance, can range from $75 to $22,000. Lighting, for both aesthetics and safety, might cost between $450 and $1,800, or around $200 per light. Heating systems can range from $500 to $7,500 , or $1,500 to $6,000 with installation , with solar options costing between $2,500 and $6,500. Excavation itself can cost between $500 and $5,000, or $2.50 to over $200 per cubic yard , and renting the necessary equipment might add approximately $2,000 per week. Plumbing and electrical work could cost an estimated $600 to $1,500 , while landscaping the surrounding area might range from $2,000 to $8,000. Filling the pool with water can cost between $60 and $1,250 , with an average cost of $180. For fiberglass pools, the cost of a crane for installation ($400-$800 ) and backfill material ($1,000-$2,000 ) should also be considered.
Finally, the ongoing costs of pool ownership must be factored into the overall feasibility assessment. Regular maintenance, including chemicals and cleaning, can average between $80 and $150 per month, or around $180 per month. Seasonal opening and closing of the pool might cost between $300 and $550. Utility bills, particularly for energy (averaging $50 per month but potentially reaching $300 for heat pumps ) and water, will also increase. For vinyl liner pools, the liner will need to be replaced periodically, incurring a significant expense. Concrete pools will require periodic acid washing and eventual resurfacing, adding to the long-term cost of ownership. These recurring expenses demonstrate that the total cost of a DIY underground pool extends well beyond the initial construction phase.
Before any physical work begins, meticulous planning is essential for a DIY underground pool project. The first crucial step involves identifying and addressing any potential underground concerns. Homeowners must contact 811 to request the marking of all underground utilities, including gas, electric, water, and cable lines. This step is paramount to prevent dangerous and costly damage during excavation. Additionally, the site should be carefully examined for other potential obstacles such as existing sprinkler lines, septic fields (including forgotten leach fields in older communities ), tree roots (which can compromise the pool liner and structure over time ), and any large boulders that might be encountered.
Once underground concerns have been addressed, the next step is to accurately mark the area for excavation. This involves staking out the planned dimensions of the pool, along with an additional over-dig area, typically recommended to be about 5 feet longer and 5 feet wider than the actual pool size. This extra space provides a safe and workable area around the pool walls during construction. It is also prudent to consider and mark out the area for any planned decking or patio that will surround the pool. Bright paint or flour can be used to clearly delineate these boundaries. Following the marking phase, the existing grass and the top layer of soil, known as topsoil, should be removed. Topsoil is valuable for later landscaping purposes and should be set aside if possible. A sod cutter, often available for rent, can be used for larger areas, while shovels and scrapers might suffice for smaller projects.
The primary stage of the project is the excavation itself. For an inground pool, renting a trackhoe or excavator is generally necessary, with rental costs potentially around $2,000 per week. Homeowners should be prepared for the sheer volume of soil that will be removed during this process. It is often advised to plan for the disposal of this excavated soil, either by arranging for it to be hauled away or by identifying a suitable storage location on the property. Some contractors suggest that the actual volume of excavated soil can appear to be five times the volume of the hole itself. After the initial digging, the pool needs to be shaped according to the specific design plans. This involves creating the shallow end, the deep end (often called the hopper ), and the slopes that transition between these depths. Ensuring the bottom of the pool is level is crucial for structural integrity and can be achieved by adding and leveling a layer of gravel if needed.
A common challenge during pool excavation is encountering groundwater. Depending on the severity, several solutions exist. For minor water seepage, over-digging the bottom and then using gravel to bring the level back up to the desired depth might be sufficient. In more extreme cases, a sump pump might be required to continuously remove water from the excavation, or a French drain system could be installed at the deepest point to manage persistent groundwater. Finally, it is recommended to dig a trench to accommodate the plumbing lines that will run from the pool to the location of the filtration and pump equipment. This trench should ideally be at least eighteen inches deep and extend from the pool’s over-dig area to the planned equipment pad location. This proactive step can save significant manual digging later in the construction process.
DIY pool excavation is not without potential challenges. The type of soil encountered can significantly impact the difficulty and cost. Rocky soil or bedrock, for instance, can drastically increase excavation costs and might necessitate specialized equipment like a hammer attachment for the excavator. Unexpected obstacles such as unusually large rocks or unstable soil conditions can also prolong the digging period. Safety is a paramount concern during excavation, with the risk of cave-ins being a serious hazard. It is highly recommended that anyone undertaking DIY excavation research OSHA training on excavation safety. Additionally, heavy rainfall during the excavation phase can lead to soil collapse and the need to reshape the hole, potentially causing significant delays. Finally, homeowners need to have a clear plan for managing the large volume of excavated soil, as its disposal or storage can present a logistical challenge. The essential tools and machinery for DIY pool excavation typically include a shot stick or level measuring stick, a transit or water level for accurate depth measurements, an excavator or mini excavator and potentially a wheel loader for moving soil, rebar stakes and a hammer for marking outlines, spray paint or flour for marking lines, and string for establishing straight lines. While manual digging might be feasible for very small pools or specific features, for a full-sized inground pool, renting the appropriate heavy machinery is generally necessary.
The selection of materials for an underground pool is a critical decision that will influence the construction process, cost, durability, and maintenance. For DIY enthusiasts, vinyl liner pools often present the most accessible option due to their relatively straightforward installation and lower initial cost. Vinyl liner pool kits typically include all the necessary components: the pool walls (which can be made of steel, polymer, or aluminum ), the vinyl liner itself, a skimmer system, steps (often constructed from steel or polymer ), and the required hardware and bracing. Polymer walls offer the advantage of being lighter and more resistant to corrosion compared to steel, making them easier to handle for DIYers. However, steel walls provide greater flexibility for creating custom shapes and features. A significant consideration with vinyl liner pools is the limited lifespan of the liner, which typically needs replacement every 5 to 15 years at a cost of $5,000 to $7,000. Additionally, vinyl liners are more susceptible to algae growth, requiring more frequent and diligent cleaning.
Fiberglass pools offer an alternative for DIYers. These pools are pre-formed shells that are delivered to the site and placed in the excavated hole. While DIY installation is possible and can result in savings on labor, it necessitates the use of specialized equipment, primarily a crane to lift and position the heavy shell. Fiberglass pools are known for their durability, with a typical lifespan of around 25 years, and their smooth, non-porous surface is resistant to algae growth. However, a major limitation of fiberglass pools is the lack of customization options, as homeowners must choose from the available prefabricated shapes and sizes.
Concrete or gunite pools, while offering exceptional durability and complete design flexibility , present a much greater challenge for DIY construction. Building these types of pools requires extensive experience in concrete work, including the construction of formwork, the pouring or spraying of concrete to create the pool’s structure , and the application of a waterproof finish such as tiles, mosaic, or a pool liner. The application of gunite or shotcrete, a common method for building concrete pools, often requires a skilled professional. DIY concrete pool construction also involves a significant curing period for the concrete, typically around 28 days, during which the surface must be kept consistently moist. Furthermore, concrete is a porous material and requires proper sealing and ongoing maintenance, including regular acid washing and eventual resurfacing. Improper concrete work can lead to cracks and leaks, highlighting the need for significant expertise in this area.
Other materials for inground pools, such as plastic, ceramic, and stainless steel, are less commonly used in DIY projects. Plastic pools can be relatively inexpensive but may lack the durability required for long-term use and can be prone to deformation. Ceramic pools offer good durability but might be more challenging to install for a DIYer. Stainless steel pools are a premium option known for their longevity but are also very expensive. Building a pool using cinderblocks is another possibility, as demonstrated in some DIY projects. While this method might be more accessible in terms of basic construction skills, the long-term durability compared to professionally built pools might be a concern.
Regardless of the chosen material, the general steps involved in building an inground pool typically include marking the area and completing the excavation, setting up the pool walls and any necessary bracing, pouring a concrete bond beam around the perimeter of the walls for reinforcement, carefully troweling and smoothing the pool bottom to create the desired contours, installing the coping (the edging around the pool) and completing the plumbing work, installing the liner if it’s a vinyl liner pool, and finally, filling the pool with water and backfilling around the pool walls.
Adding a waterslide to a backyard can significantly enhance the fun and recreational value of the space. For DIY enthusiasts, there are several approaches to consider, ranging from simple, temporary solutions to more elaborate, permanent constructions. One of the most accessible DIY options is the simple slip-n-slide. This involves using a roll of thick plastic sheeting, ideally at least 6 mil in thickness for better durability , along with foam pool noodles to serve as safety bumpers along the sides. Waterproof or duct tape is used to secure the bumpers and any seams in the plastic sheeting. A garden hose provides the necessary water flow, and a liquid soap, preferably tear-free baby shampoo, acts as a safe and effective lubricant to make the slide slippery. Lawn stakes or tent pegs can be used to anchor the plastic sheeting to the ground and prevent it from shifting during use. For added safety, hay bales or foam camping mats can be placed at the end of the slide to cushion landings. Some users also find that sitting on a garbage bag or an additional piece of plastic sheeting can increase the speed of the slide. Constructing a slip-n-slide involves selecting a gently sloping area in the yard with soft terrain like grass or sand and ensuring a safe, open landing area. The plastic sheeting is laid out, and the pool noodles are rolled into the edges of the plastic to create bumpers, which are then secured with tape or stakes. The entire slide is then anchored to the ground. A garden hose is placed at the top to run water down the slide, and a lubricant is applied to the surface. The cost of a simple slip-n-slide is relatively low, primarily involving the cost of the plastic sheeting and pool noodles, potentially totaling under $100 to $200. Some DIYers have even managed to create functional slides with a budget as low as $10.
For those seeking a more permanent and elaborate DIY waterslide, there are options beyond a basic slip-n-slide. One approach involves constructing a more structured ramp using plywood, potentially elevated with supports. Padding materials like interlocking closed-cell foam pads, carpeting, or carpet padding can be added to the ramp surface for increased comfort and safety. Pool noodles can still be used effectively as side bumpers, and a durable, heavy-duty plastic sheet can serve as the sliding surface. Building this type of waterslide requires more significant planning, construction skills, and attention to structural integrity to ensure safety. Other potential DIY waterslide ideas include exploring the use of PVC pipes, although the cost of larger diameters can be substantial , or even repurposing an existing sturdy playground slide by adding a system to run water down it.
Another option for homeowners looking to add a waterslide is to purchase a commercial residential waterslide. These are available in various designs, including straight, curved, molded, and corkscrew models, and are typically made from durable materials like plastic or fiberglass. The cost of residential water slides can range from around $1,000 to upwards of $20,000 or more, depending on the size, features, and brand. Professional installation can add to this cost. Commercial slides are designed with safety in mind and often include features like non-slip steps, optimized water flow, and high side walls to keep riders safely within the flume. They also typically have specific requirements for the depth of water at the slide’s exit, with 4 to 6 feet often being recommended. The choice between a simple DIY slip-n-slide, a more elaborate homemade waterslide, or a commercial waterslide ultimately depends on the homeowner’s budget, desired level of durability and features, DIY skills, and safety priorities.
Safety is the most critical aspect to consider when building and using any DIY waterslide. Establishing and clearly communicating a set of safety rules is the first essential step. These rules, adapted from guidelines for commercial slides, should include always sliding down feet first, either sitting up or lying on the back with legs crossed and arms folded. Headfirst or stomach riding should be strictly prohibited. Only one person should use the slide at a time , and if multiple riders are present, a safe interval (e.g., at least six seconds) should be maintained between them. Riders should be instructed not to stop or grab the sides of the slide during their descent and to always start from a seated position at the top, avoiding running or diving starts. Upon reaching the bottom, riders should immediately exit the splashdown area , and loitering should not be permitted. Diving or jumping into the pool from the waterslide should be strictly forbidden , and climbing up the slide should not be allowed. Weight limits should be considered based on the materials and construction of the slide. Constant adult supervision is essential when children are using the waterslide , and the pool should have an adequate water depth in the landing area, generally at least 3 feet. The splash zone should be kept clear of any obstructions. Wearing shoes or hard/sharp objects on the slide should be prohibited, and appropriate swimwear should be worn. Unless the slide is specifically designed for them, mats or inflatable tubes should not be used. Roughhousing or horseplay should be discouraged , and the slide should not be used while under the influence of alcohol or drugs. Pregnant women and individuals with certain health conditions should also refrain from using the slide.
The materials used in a DIY waterslide directly impact its safety and durability. Thick, durable plastic sheeting is recommended to minimize tears and friction burns , and black sheeting should be avoided due to its heat absorption. Smoothing the ground underneath the slide and adding padding in landing areas are crucial safety measures. Pool noodle bumpers should be securely attached to prevent riders from going off course , and only non-toxic lubricants like baby shampoo should be used. For elevated DIY slides, ensuring the ramp structure is well-supported and securely anchored is paramount. Regular inspection of the slide for damage or loose parts is also essential. While specific regulations for DIY residential waterslides might be less common than for pools, it is still prudent to check local building codes and be aware that insurance companies may view pools and slides as potential hazards.
Designing a “hidden watermelon house” offers a unique opportunity for creative expression in the backyard. Drawing inspiration from fruit-themed playhouses, a structure shaped like a giant watermelon, complete with appropriate coloring and “seed” details, could form the basis of the design. Alternatively, the concept could be adapted from fruit and vegetable market-themed playhouses , transforming a market stall into a whimsical house with a watermelon-inspired facade. Strawberry-themed playhouses can also provide ideas for shape and color combinations. Incorporating fruit-themed art panels or decorations can further enhance the theme.
To achieve the “hidden” aspect, several design strategies can be employed. Earth berming, the practice of partially or fully burying the structure, can create a sense of being nestled into the landscape. This method not only contributes to the hidden feel but can also provide natural insulation. Strategic landscaping, using dense plantings, trees, or vine-covered trellises, can also effectively conceal the watermelon house. Creating a winding pathway leading to a secluded location for the house, perhaps with a “secret garden door,” can add to the sense of discovery. Finally, using colors and materials that blend with the surrounding environment can help the structure feel more integrated.
Standard playhouse design elements can be adapted for the watermelon house, including multiple levels or a loft, a small slide or climbing wall for access, windows and a door (perhaps an arched “watermelon slice” entrance), and interior features like benches or a play kitchen. If pets are part of the household, making the watermelon house dog-friendly could be a consideration. Common construction materials for playhouses include wood , which can be combined with earth berming. Using salvaged or upcycled materials can add a unique and whimsical touch.
Before undertaking any construction, it is imperative to investigate local regulations regarding building permits. Inground pools generally require permits if they exceed a certain depth (e.g., 24 inches ) or size. Permits ensure compliance with zoning, building codes, and safety standards. The application process typically involves submitting plans and paying fees. Inspections are usually required. Key regulations often involve setbacks, fencing (minimum 4 feet high with self-closing, self-latching gates ), and electrical safety. HOAs may have additional rules. Failure to obtain permits can lead to penalties. Waterslide regulations for residential use might be less common, but safety standards from organizations like CPSC and ASTM should be considered. Depending on its size and features, a permit might also be required for the watermelon house, similar to a playhouse or shed. Information on local regulations can be obtained from the city or county building department or zoning office and their websites.
Integrating the underground pool, waterslide, and hidden watermelon house into a cohesive backyard design requires careful planning and creativity. A unifying theme, such as the “hidden watermelon” concept, can guide the design choices. Landscaping plays a crucial role in creating a sense of a secluded oasis, with lush, tropical plants enhancing the theme. A freeform or lagoon-style pool can contribute to the natural, hidden feel , and the waterslide could be designed to emerge from a rock feature or a thematically appropriate structure. The placement of the waterslide should be considered to integrate it naturally into the landscape, perhaps starting from a raised area near the watermelon house or utilizing existing slopes. A subtly designed entrance to the pool area can further enhance the hidden theme. Connecting the watermelon house and pool area with pathways or stepping stones encourages exploration. Whimsical garden decor, such as colorful lights or fruit-shaped accents, can complement the theme. If the terrain allows, a multi-level design can add visual interest, with the watermelon house overlooking the pool and the waterslide connecting them. Safety should be a key consideration, with clear sightlines for supervision and non-slip materials for surfaces. The new features should also integrate with any existing patios or landscaping. For smaller backyards, efficient design and multi-functional elements are crucial.
Creating a DIY underground pool and waterslide around a hidden watermelon house is an ambitious project that requires careful planning, significant effort, and financial investment. While the challenges are considerable, the potential to create a unique and personalized backyard retreat is immense. Thorough research into local regulations, meticulous planning, a strong focus on safety, and a creative approach to design are essential for success. For those willing to undertake this exciting adventure, the reward will be a backyard that truly makes a splash.