How much does it cost to build an in-ground fiberglass swimming pool?

Reviewed by Cristina Miguelez remodeling expert. Written by Fixr.com.

Pools make a fun addition to many properties. They allow you to cool off on a hot day in your backyard. Fiberglass pools are one of the more common in-ground pools, requiring less ongoing maintenance and electricity than other materials. In-ground pools made of fiberglass can enhance your home’s resale value and make it more attractive to potential buyers. Fiberglass pools come in a range of sizes with several accessories. This creates a range of costs.

The national average cost range for installing a fiberglass pool is $50,000 to $95,000. Most homeowners pay around $70,000 for a 15’ x 30’ in-ground fiberglass pool with a concrete deck, filter, heater, and pump. This project’s low cost is around $15,000 for a small fiberglass spool fully installed. The high cost is around $200,000 for a 20’ x 40’ rectangle fiberglass pool with a stamped concrete deck and an enclosure.

Fiberglass In-Ground Pool Price

Fiberglass Pool Sizes and Prices

Fiberglass swimming pools come in various sizes, ranging in price from $100 to $200 per sq.ft. They are limited in size, with 20 feet wide and 40 feet long being the maximum dimensions. They come in several sizes, meaning they fit into a range of areas. The size determines what you ultimately pay for the pool and installation. Most fiberglass pools are priced by length rather than width, but some variations exist. Size is only one factor in your total cost. Ledges, stairs, a deck, and accessories impact your final price tag.

The 10’ x 20’ and 12’ x 24’ fiberglass pools are the smallest sizes. They are mainly recreational pools that can be installed partially above-ground for homeowners who do not have leveled yards. A 15’ x 30’ fiberglass pool is one of the most common, large enough for several recreational and athletic purposes. Pools in sizes 16’ x 32&rsquo and 18’ x 36’ are great for practicing laps and can have several sections and features like zero entry, stairs, or separate spa areas. However, due to their size, you need a larger-than-average yard. A 20’ x 40’ fiberglass pool can have a full range of features and is large enough for recreation or exercise. These pools should be fully in the ground but require significant space. Here are the prices you can expect for the most common pool sizes.

Average Cost of a Fiberglass Pool by Type

Like many pool materials, fiberglass pools come in several types, with prices ranging between $15,000 and $110,000. When looking for something beyond the typical backyard pool for recreation, you consider some other types. Many can be used in smaller yards, so they can be a good fit if you want a pool but do not have much room. The table below shows the most common pool types and the cost to install them.

Spool

Installing a fiberglass pool costs $15,000 to $35,000. A spool pool is a type of swimming pool that is rectangular and typically has a depth of around four feet. Unlike traditional pools, spool pools do not have a deck or other platforms around them, making them more compact and easier to install. Because of their smaller size, spool pools are often used for lap swimming or as a place to cool off on a hot day. In addition, spool pools can be installed in areas where a traditional pool would not be feasible, such as on a rooftop or in a small backyard.

Fiberglass Saltwater Pool

The cost of a fiberglass saltwater pool ranges from $15,000 to $35,000, fully installed. Any fiberglass pool can be converted into a saltwater pool. All you need is to install a saltwater generator, which converts the salt you add to the pool into chlorine. Saltwater pools have lower chemical and maintenance costs. The water is softer and less harsh on the skin. Saltwater pools can damage your surrounding landscaping, so make sure your pool has a wide deck.

Fiberglass Plunge Pool

A fully installed fiberglass plunge pool costs between $15,000 and $40,000. Plunge pools are small pools meant for cooling off, not swimming. They can be installed in-ground or above-ground in a drop-in or backfilled style. Plunge pools are good for people without much space but who want a way to get cool and wet in the hotter months. Fiberglass plunge pools are more limited than some other materials due to size. They may be larger and more expensive than you can find with vinyl or concrete.

Fiberglass Drop-In Pool

A fiberglass drop-in pool costs from $20,000 to $55,000. Drop-in pools are small above-ground pools. They are dropped into a deck rather than set into the ground. This is one of the few ways to create a fiberglass above-ground pool. By building a custom deck with supports and dropping the pool into it, you can have an above-ground pool. This pool’s lip or edge is visible rather than hidden beneath coping like an in-ground pool.

Lagoon

Installing a lagoon fiberglass pool costs between $40,000 and $110,000. A lagoon pool is a type of swimming pool designed to look like a natural lagoon. Lagoon pools typically have gently sloping sides, rocks, and plants and may even include features such as waterfalls. Lagoon pools are usually larger than traditional pools, and they often have multiple levels to give the illusion of depth. Because of their natural appearance, lagoon pools can be a relaxing and enjoyable addition to any backyard.

Indoor

Expect to spend between $45,000 and $85,000 to install an indoor fiberglass pool. Any type of fiberglass pool can be installed indoors, but some things must be considered. First, you need to make sure that the flooring around the pool can withstand constant moisture. Indoor pools require a higher level of humidity than outdoor pools, which can potentially damage the floor and the fiberglass shell. Also, the indoor pool needs to be properly ventilated to prevent the build-up of harmful chemicals. Finally, you need to make sure that you will also have enough space to accommodate the additional features needed for a pool in order to have a comfortable swimming experience.

Fiberglass Lap Pool

A fiberglass lap pool costs $50,000 to $60,000. Lap pools are long, thin in-ground pools. They are designed for exercise rather than recreation. They are usually about 40’ long. This is the maximum that the fiberglass pool can be built. They are often not very wide, measuring between 6’ and 12’ wide, depending on the number of intended users. This can be a good option for those who want a pool for exercise but do not have the width for a larger pool.

Fiberglass Infinity Pools

A fiberglass infinity pool costs between $90,000 and $110,000. Infinity pools make a beautiful statement on any property. They have an edge where the water cascades over the pool into a small basin below. The water is pumped up and back into the main area. This creates an endless or infinite edge for the pool. Due to the shape and the extra mechanics involved, this pool tends to be much more expensive. Because one edge is exposed, the rest of the pool sides must be backfilled to support the pool.

Fiberglass Pool Cost by Finish

Fiberglass pools have a price range of $35,000 to $95,000, depending on their finish. All fiberglass pools have a gel-coat finish applied to the pool’s surface. This finish can have different looks and colors, including flecked, metallic, and solid. Most manufacturers use a solid finish, which means one layer of material is used to create the finish. Others use a multi-coat finish. This gives a more interesting finish because they can apply different tones and finishes on top of one another for a unique color and design.

However, the multi-layer finish can be problematic in the long run. Fiberglass gel coats eventually develop cracks. A solid-surface gel coat is easy to repair and more closely matches the original color. A multi-finish surface is more difficult to match when repairing, so the patch likely shows. Multi-step gel coats cost more than solid surfaces. So, your finished and installed pool is less expensive if you opt for a solid surface. Below are the total costs for your installed pool if you choose a solid surface versus a multi-coat finish.

Average Cost of a Fiberglass Pool by Brand

Depending on the manufacturer of the fiberglass in-ground pool, the cost ranges between $22,000 and $100,000. With a wide range of models and customized options, different brands offer something for every type of pool owner. Because the fiberglass components are first molded in an enclosed facility, customers can rest assured that their pool will be free from materials that may be harmful to swimming health. Many pool companies make pools that they install and include in the purchase price. Some companies, however, may sell an established brand of pool and only do the installation. Costs vary between brands, mostly on things like the finish and features.

Several popular brands that manufacture fiberglass pools include San Juan, Viking, Thursday Pools, Latham, Blue Hawaiian, and Alaglas. San Juan offers a wide range of shapes with features like tanning ledges and double sets of stairs. They also have unique shapes not found in other companies. Viking allows you to choose the level of installation and customization. They offer three packages, basic, mid-tier, and high-end, depending on how many features the pool has. Thursday Pools sells large fiberglass pools for in-ground use only. They have features like tanning ledges and a unique wall material infused with fabric. Latham’s pools come in two installation types. Their basic installation includes the excavation, shell, backfill, and hookup, but little else. Blue Hawaiian offers installations that include permits, excavation, installation, backfill, and equipment. All equipment is basic-grade, but you can upgrade for a higher cost. Finally, Alaglas emphasizes their pools’ strength and durability. Their fiberglass pools are built from multiple layers of material to ensure a strong, durable shell. Here are the prices of the most popular fiberglass swimming pool manufacturers.

In-Ground vs Above-Ground Fiberglass Pool Price

Most fiberglass pools must be installed in the ground. Their prices range from $15,000 to $95,000, depending on where you want to install the pool. Some smaller pools may be installed partially above ground. This can be done by backfilling partway up the pool’s sides for support or creating a raised deck. Fiberglass pools should never be used entirely above ground without support. There is little difference between the two types in cost because of this support, with the exception that most pools that can be used partially above ground tend to be smaller and less expensive than larger pools installed in-ground. The table below shows the price for both types of pools.

Above-Ground Fiberglass Pool

Above-ground fiberglass pools cost between $15,000 and $35,000, fully installed. Fiberglass pools are made of a thin, flexible, and durable shell. But that shell is not meant to sit on the ground and act as an above-ground pool. It can be partially placed in-ground and backfilled. This is a good choice if you do not have a level yard. You can also build a raised deck around the pool, provided the deck is solid enough to provide support, such as a concrete deck or a wooden deck that has been backfilled beneath the surface.

Fiberglass In-Ground Pool

A fully installed fiberglass in-ground pool costs from $50,000 to $95,000. All fiberglass pools can be installed in-ground. This is their intended purpose. They are a popular in-ground pool because once the shell is made, the entire installation can be done in a few days. From the time you order the shell and start the process to when you are enjoying your pool is only a few weeks. Fiberglass in-ground pools are also very durable, low maintenance, and unlikely to develop leaks over time.

Fiberglass Pool Installation Cost Breakdown

The cost of installing a fiberglass swimming pool depends on a number of factors, including the size of the pool, any additional features that are being added, and the complexity of the job site. Typically, most professionals charge a per-project fee to cover their labor costs or an hourly rate of $50 to $150 per hour, depending on their expertise. Fiberglass pool installation is a complex process that requires specialized knowledge and equipment. To ensure the highest quality results, most professional fiberglass pool installers are trained in the latest techniques and use specialized tools. Additionally, they typically have years of experience working with the materials required for such installations, so they can smoothly handle any challenges.

Because a fiberglass pool shell is made off-site, most of the labor in building the pool is in the excavation, dirt hauling, and deck installation. For most pool projects, excavation is done first. Then the pool is shipped and lowered into place. It is then backfilled, with dirt tightly encasing the walls on all sides. The deck and coping are installed, and then the equipment, including the pump, filter, heater, and other features. If you choose a high-end pool package, the pool can be finished with tiles and other options before it is filled with water. Every pool installation is different. Some require rocky terrain blasting, while others may not. Some need additional backfilling for things like an infinity edge. Depending on where you live, you may need to have water brought in by a truck to fill your pool, or you can fill it with a hose. The table below shows a breakdown of the costs of installing a pool.

Fiberglass Pool Replacement Cost

Pool replacements increase your total costs by $20,000 to $30,000, making the total cost range $70,000 to $125,000, depending on the pool size and type. A number of factors contribute to this cost, including the size and condition of the existing pool and any structural repairs or upgrades that may be necessary. Additionally, a replacement often requires hiring specialized contractors and purchasing new equipment, materials, and supplies.

Many homeowners find that investing in a replacement is worthwhile to achieve the appearance and functionality they desire for their outdoor space. Whether it is an aging shell that needs revitalization or an outdated shape and design that needs updating, replacing a fiberglass pool can be the perfect way to achieve your goals for your yard. You may also find your current pool is no longer meeting your needs. In this case, you may want to invest in a larger or differently shaped or formed pool.

Fiberglass Pool Shell Cost by Length

Depending on the shell length, fiberglass pool prices range from $12,000 to $30,000. Many factors determine the length of a fiberglass pool shell, including the pool’s size and shape and the specific requirements and preferences of the homeowner. Generally, most fiberglass pool shells are between 16 and 30 feet long. This range allows for various pool shapes, including kidney-shaped pools, free-form designs, lap pools, or even swimming holes or naturalistic ponds. In terms of customization options and personalization, having a longer pool shell provides more design flexibility and allows for greater creativity in developing your ideal swimming space.

Fiberglass Pool Deck Cost by Material

The pool decking has a range of costs, with most costing $3 to $40 per sq.ft. Nearly all fiberglass pool costs include a concrete deck in their total. Only the most basic installations do not include at least some type of decking. This is partly because the pool must have some concrete coping installed around the edge as part of its installation. However, you can upgrade your deck to another material if you do not want a concrete deck. Most pool decks use the same material as patios and have similar pricing.

While certain materials, such as concrete and pavers, will be more affordable upfront, this might not be the case in the long run. These materials crack and become damaged over time, resulting in costly repairs or replacements. In contrast, a deck made of stone, bricks, pavers, and flagstone material is designed to resist wear and tear, making it significantly more durable and reliable over the long term. This type of deck may also require fewer ongoing maintenance costs, such as sealing, a requirement with concrete decks.

Fiberglass Pool Shapes

Unlike vinyl and concrete pools, fiberglass pools cannot be created in endless shapes. They are limited in what molds a particular company produces, with 40’ being the maximum length offered by companies. However, numerous designs are available. Most companies have several fiberglass pool shapes, including rectangular, Roman, kidney, and freeform/lagoon.

Many factors must be considered when choosing the shape of your pool. One important consideration is the size and layout of your backyard. If you have a large backyard, you may want to choose a free-form or kidney-shaped pool. These pools offer a lot of flexibility in terms of design and can be customized to fit your specific needs. If you have a smaller backyard, however, you may want to choose a more traditional rectangular or square pool. Another important consideration is how you plan to use your pool. If you plan to use your pool mainly for swimming laps, a long and narrow pool may be the best option. On the other hand, if you want to use your pool for relaxing or entertaining, then a larger and more open pool may be the better choice. However, the pool’s shape does not necessarily impact the cost. Because the molds are already made, it is just a matter of pouring.

Add-Ons

To get the most out of your fiberglass pool, it is important to choose the right add-ons and upgrades. Most fiberglass pools also have various equipment installed as part of the package. These include the filter, pump, heater, and sometimes lighting. If you choose, you can upgrade or add additional features. Some of the most common options include solar covers, a saltwater chlorinator system, and energy-efficient pumps and filters. Each of these add-ons improves the performance and convenience of your pool. Considering all your options when building or upgrading your pool is essential. With the right add-ons, you can turn an ordinary fiberglass pool into an incredible backyard retreat. Here are the most common add-ons for a fiberglass pool and the cost to add each of them.

Fiberglass Pool Maintenance Cost

The average homeowner spends around $350 and $550 on pool maintenance for fiberglass in-ground pools. Maintaining a fiberglass pool is essential for ensuring that it stays in good condition and works properly for years to come. While strong and durable, fiberglass can become cracked or vulnerable to staining if not cared for properly. It is best to purchase a recurring plan through which a pool maintenance company will inspect and adjust your pool on an annual, monthly, seasonal, or weekly basis. During their regular visits, the professional will ensure that the pool parts are working properly, the water is safe and healthy, there are no leaks and cracks, and do some equipment cleaning.

When you start with pool maintenance, it is important to check your pool’s water level and pH balance regularly. This can be done using a testing kit or by relying on your local pool service provider. Additionally, you should also perform routine cleaning and vacuuming of any debris and dirt that may have settled in the bottom of the pool over time. The surface of the water will need skimming. The sides of the pool will require brushing to keep debris from falling into the pool. Finally, you should pay attention to any potential signs of damage or wear on your pool surfaces.

Pros and Cons

Fiberglass pools offer numerous benefits compared to other types of pool materials. For one, they are significantly less expensive to install, making them a more affordable option for many homeowners. They can also be installed in just a few weeks. In addition, fiberglass pools require minimal care and maintenance over time because of their smooth surface, which is naturally resistant to stains and debris.

However, these pools also have some drawbacks that should be considered. These pools are shallow, so they cannot be used for diving. They are also somewhat restricted in size due to how they are delivered. While most manufacturers have several shapes to choose from, you cannot customize their design. Fiberglass pools often become brittle in cold weather and make it difficult to conduct any necessary repairs without risking the integrity of the entire pool shell. Furthermore, fiberglass pools require high levels of chemical treatments and attention to maintain water quality.

Fiberglass vs Concrete Pool Price

Costs range between $69.50 and $312.50 per sq.ft. for a concrete pool and $100 to $200 per sq.ft. for a fiberglass in-ground pool. Both materials offer their own advantages and disadvantages, but ultimately it comes down to your personal preferences and needs. Fiberglass and concrete pools are popular for backyard use. They are factory-made, delivered, and dropped into your yard, while concrete pools are built onsite. This makes fiberglass pools faster and easier to install and less expensive. Concrete pools are generally considered more durable and long-lasting than their fiberglass counterparts, but they are also typically more expensive to install and require regular maintenance.

On the other hand, while fiberglass pools tend to be less costly upfront, they may not be as structurally sound as concrete pools over time. Finally, concrete pools can be endlessly customized, while fiberglass cannot. This means that homeowners can choose a different shape, size, and depth for a concrete pool, while fiberglass is limited in these areas. Ultimately, the best way to choose between these two materials is to consider a few key factors, including budget, installation requirements, and aesthetic preferences, before deciding. Here are the costs per sq.ft. to install each type.

Fiberglass vs Vinyl Pool Price

A fiberglass pool costs $100 to $200 per sq.ft. installed, while vinyl liner pools cost $122 to $225 per sq.ft. Although both materials have their advantages, fiberglass pools tend to be the better choice in most cases. Vinyl pools are less expensive than fiberglass initially, but they need their liner replaced frequently. This makes their lifetime cost higher than that of a fiberglass pool. In addition, fiberglass is a highly durable material that can withstand high temperatures and harsh weather conditions without cracking or losing shape. Fiberglass undergoes much less chemical processing than vinyl, creating fewer negative environmental impacts. Fiberglass pools can be installed much more quickly and easily than vinyl pools, resulting in lower overall costs and less disruption to your yard. However, vinyl pools can be customized and come in any shape, size, and depth, while fiberglass pools are more limited in these areas. The table below shows the average cost per sq.ft. to install each type.

Enhancement and Improvement Costs

Mosaic Waterline Tile

Mosaics cost $20 to $50 per sq.ft. installed. Waterline mosaics add a decorative touch to your fiberglass pool. These are small tiles made of glass or ceramic installed just at and above the waterline, but you can have them cover the entire pool. Additionally, waterline tiles make it easier to clean your fiberglass pool. The smooth texture makes it simple to wipe away any suds or dirt that may accumulate along the tiles. Also, the coordinating color palette ties everything together visually.

Enclosure

The average pool enclosure costs around $10,000 to $30,000 to install. Whether you want to prevent leaves, bugs, or other debris from getting into your water or to protect yourself and your family from strong winds or lightning strikes, a pool enclosure does an excellent job of keeping your space safe and comfortable. In addition, pool enclosures help regulate the temperature of your pool more easily. Enclosures may be mesh or glass-walled, or they may be as simple as a fence.

Fence

The average cost to add a fence to a pool area is around $3,000 to $10,000, including the gate. Fences are integral to pools. Fences create a barrier between the pool and the rest of the yard, making it more difficult for children and animals to fall into the water. In addition, they deter trespassers from taking a dip in your pool without permission. Pool fences can be made of any fencing material. Their cost is driven by the size of the area you are enclosing.

Fiberglass Pool and Spa Combo

Fiberglass pool and spa combos cost between $35,000 and $90,000. This pool can be a cocktail pool, a “spool,” or a much larger pool with a separate spa area. Some larger pools have a small circular area at one end. This area can be jetted with a heater, making it a spa section. There are many ways to set up a pool and spa combo. Cocktail pools are the ideal solution for saving space, while the larger versions are best done in oversized yards.

Additional Considerations and Costs

• Permits. In some areas, a building permit may be necessary before beginning construction. Costs vary by town and region. Typically, your builder advises you about the process and if a permit is necessary. However, it is the homeowner’s responsibility to ensure the necessary permits are pulled.
• DIY. Pools are not generally considered DIY projects because of the amount of excavating involved. You need to take care not to hit utilities and ensure the proper backfill is used. Also, the selected pool area must be leveled. However, there are parts that many homeowners do DIY, including the deck.
• Kits. Some swimming pool companies offer a fiberglass pool as an all-in-one kit. This takes the guesswork out of pricing and allows for some degree of DIY. Generally, even if you opt for the kit, it is best to have a professional evaluate your yard and do the excavating before proceeding. The total for the kit is around $15,000 to $20,000.
• Guarantee. When purchasing a swimming pool, always ask the company or manufacturer if they have any warranty or guarantee on the pool, lining, and/or installation. If so, get this in writing to ensure you have appropriate documentation.
• Location. Fiberglass pools can be used anywhere, but they are particularly useful in certain areas. Because they are not deep and use a specific backfill, they can be used in regions with high water tables. They can also withstand cold winters because they hold heat well and are not affected by freeze/thaw cycles.
• Stairs. Fiberglass pools are made of one piece, so they do not have separate steps or stairs. If you choose to have stairs, you need to choose a design that includes this option. Costs may be slightly higher for these shells than those without steps.
• Resurfacing. Fiberglass pools are finished with a gel-coat surface. This long-lasting finish lasts for decades, but a pool may lose its gel coat. When this happens, it must be resurfaced, which costs $10,000 to $20,000 for a complete resurfacing.