Small Fiberglass Pools: Sizes, Costs, and Shapes for Compact Backyards

What Are the Different Types of Small Inground Pools?

What Is a Wading Pool?

A wading pool is a very shallow pool, typically 18 inches to 2 feet deep, designed for lounging, sunbathing, and supervised play for young children rather than traditional swimming. The shallow depth creates a visually attractive backyard water feature and a comfortable cooling spot on a hot day. With appropriate adult supervision, wading pools give toddlers and small children an accessible introduction to water.

What Is a Cocktail Pool?

A cocktail pool is a compact inground pool typically 3 to 4 feet deep, designed primarily for entertaining. Built-in bench seating along the interior walls is a standard feature in most cocktail pool configurations, giving guests a place to sit, sip, and socialize in the water. The depth and social layout suit adult gatherings where the pool serves as an amenity rather than a dedicated swimming space.

What Is a Spool?

A spool combines the features of a spa and a pool in a compact footprint, typically 3 to 5 feet deep. Adding hydrotherapy jets to a spool gives it spa-like functionality while providing significantly more space than a traditional hot tub. Spools work particularly well in backyards where a homeowner wants both recreational water use and hydrotherapy capability in a single, smaller footprint.

What Is a Plunge Pool?

A plunge pool is a compact inground pool typically 4 to 5 feet deep in a small footprint for cooling off, lounging, and light exercise. The combination of functional depth and compact size makes plunge pools one of the most popular small fiberglass pool options for homeowners with limited yard space. Thursday Pools’ Plunge Pool Series offers pre-made small fiberglass plunge pool designs with built-in benches and steps included at no additional construction cost.

How Much Does a Small Fiberglass Pool Cost?

Several line items affect the total cost beyond the pool shell and core installation, and a smaller footprint changes some of them in ways worth knowing before you budget.

What scales down with a smaller pool:

Excavation and Dirt Hauling: A 16- to 20-foot shell displaces significantly less soil than a full-size model. Standard hauling typically runs up to $800 per Angi and stays near that floor for most small pool installations.

Cover Cost: A smaller footprint reduces the square footage and linear footage of both manual retractable and automatic cover systems, lowering the cost relative to larger pools.

Water Volume: Less water to fill at installation and less to heat and filter throughout the season. Both startup cost and ongoing operating cost reflect the smaller pool’s reduced volume.

Fencing Perimeter: Existing yard walls or structures may cover part of the required safety perimeter, reducing the total linear footage of required fencing for a compact footprint in a corner position.

What stays relatively consistent regardless of pool size:

Permits and Inspections: Municipal fees tie to the project, not the pool’s square footage. Budget $100 to $1,000 depending on your jurisdiction, per Pool Research.

Electrical Work: The pool still requires electrical infrastructure for the pump, filtration, lighting, and any automation, regardless of size. Budget $2,000 to $10,000 depending on scope.

Backfill Material: Crushed gravel is the correct backfill material for fiberglass pool installations at every size. The volume scales with the pool; the requirement doesn’t.

Site-Specific Factors: Rocky soil, high water tables, steep slopes, and limited access affect installation cost on any project. A smaller pool doesn’t automatically avoid these conditions.

What Is the Smallest Inground Fiberglass Pool Size Available?

As a planning guideline, try to keep the pool footprint to 25 percent or less of your available yard space. A yard of approximately 1,200 square feet can typically accommodate a small fiberglass pool with room remaining for surrounding decking and landscaping, though setbacks, access routes, and local code requirements all affect what fits on a specific site.

Standard pool size categories by surface area:

• Small fiberglass pool: 400 square feet or less
• Medium fiberglass pool: 400 to 600 square feet
• Large fiberglass pool: 600 square feet or more

What Pool Shape Works Best in a Small Backyard?

Before selecting a shape, assess your yard’s sun exposure, existing features, such as trees, garden beds, and fences, and available access for delivery equipment. 

Rectangular Pool Shapes

Rectangular small pools are the most space-efficient option for compact backyards. Straight edges align with fence lines and house walls, making efficient use of limited width and leaving clean, open sightlines to the rest of the yard. Rectangles also offer the best compatibility with automatic pool covers, which require straight parallel edges to function. Narrow or structured lots almost always benefit from a rectangular footprint.

Freeform Pool Shapes

Freeform pools use flowing, organic curves that integrate naturally with landscaping, existing trees, and garden features. In a small backyard with established plantings or an irregular footprint, a freeform pool can feel like a natural extension of the yard rather than a structure installed over it. The curves also create distinct zones and areas for lounge chairs, for pool entry and exit, and for open water that a rectangle distributes more linearly.

Roman-Style Pool Shapes

The rectangular core of a Roman-shaped pool fits efficiently in smaller spaces, and the rounded ends add visual interest without significant additional length. Roman-style pools suit formal or symmetrical backyard layouts and work particularly well when the pool serves as a visual focal point rather than purely a recreational structure.

Best Pool Shape for Your Backyard

Why Structural Integrity Matters More in Tight-Yard Pool Installations

Thursday Pools manufactures fiberglass pool shells in Fortville, Indiana, using proprietary layered construction processes engineered for structural consistency across every design, including compact plunge pools. A pre-manufactured shell that arrives structurally consistent reduces the installation variables that most commonly affect long-term pool performance.

For small pools with broad shallow areas, Thursday Pools’ patented Backfill Eliminator® provides integrated structural support that prevents the voids and settling that otherwise develop in those sections. For installations in sites with challenging soil conditions or high water tables, more common in compact urban and suburban lots, the Geo-Anchoring Pool Wall® system anchors the shell against the movement that would otherwise compromise structural stability over time.

These engineering systems are relevant at every size, and the tight-yard installations where small pools typically go are where they provide the most practical benefit.

Frequently Asked Questions About Small Fiberglass Pools

Connect With a Local Thursday Pools Dealer

The right small pool for your backyard depends on your yard’s specific conditions, setback requirements, access routes, and how you plan to use the pool. A local Thursday Pools independent dealer assesses all of those factors, walks you through which compact designs fit your space, and gives you a site-specific installation estimate.