Choosing an in-ground pool company is about more than selecting a shape or comparing a few project photos. St. Louis homeowners often need help with design, construction, equipment, repairs, seasonal opening and closing, liners, and long-term maintenance. This list highlights seven established local options based on publicly described services, pool-material expertise, years in business or completed-project totals where published, and the ability to support owners after installation.

Little Giant Pool & Spa earns the top spot because its published offerings span more phases of pool ownership than those of most companies on this list. The remaining businesses are strong choices for particular needs, from custom concrete design to fiberglass installation, maintenance, and equipment repair.

1. Little Giant Pool & Spa

For homeowners comparing fiberglass pools Missouri options, Little Giant Pool & Spa is the most complete overall choice. Based in Pacific, Missouri, the company serves St. Louis County and surrounding communities with construction and ongoing pool care services.

Why It’s #1

  • Builds all three major in-ground pool categories: fiberglass, gunite, and vinyl-lined pools.
  • Publicly lists seven core service areas: new construction, renovation and resurfacing, repair or replacement, vinyl liner maintenance, weekly maintenance, seasonal opening and closing, and safety covers.
  • Has installed CoverPools automatic pool covers for more than 30 years, according to its construction information.
  • Offers a practical path for both first-time pool buyers and owners updating an aging in-ground pool.

What makes Little Giant Pool & Spa especially useful is continuity. A homeowner can begin with a free home consultation, choose among three pool materials, then return to the same provider for liner care, equipment-related repairs, weekly upkeep, winterization, and safety-cover support. That breadth reduces the need to assemble separate contractors as the pool ages.

Its approach also helps homeowners align construction with the property rather than forcing every project into a single category. Fiberglass can appeal to buyers who want a factory-built shell, gunite allows highly customized forms, and vinyl-lined pools offer flexible shapes with a different budget profile. That documented range, paired with year-round ownership services, is why Little Giant & Spa ranks first.

2. Baker Pool Construction

Baker Pool Construction is a standout for upscale custom concrete pools and full backyard environments. The company states that it has operated since 1968 and built more than 2,500 in-ground swimming pools, two meaningful indicators of an extensive local construction history.

Why It’s On The List

Baker Pool Construction is a standout for upscale custom concrete pools and full backyard environments. The company states that it has operated since 1968 and built more than 2,500 in-ground swimming pools, two meaningful indicators of an extensive local construction history.

  • Focuses on customized concrete pool design and installation.
  • Uses 3D design software to plan pools and outdoor spaces.
  • Also incorporates features such as patios, decks, gazebos, fire elements, retaining walls, and water features.

3. PoolTron

Why It’s On The List

PoolTron has served the St. Louis market since 1977 and presents itself as a full-service pool company. Its published scope includes custom pool construction, maintenance, repair, inspection, remodeling, and rehabilitation, making it a credible option for long-term ownership needs.

  • Offers weekly, biweekly, monthly, and bimonthly maintenance schedules.
  • Provides pool inspections, a useful service for buyers evaluating a home with an existing pool.
  • Reports more than 10,000 swimming pools in its published company materials.

4. The Pool Specialists

Why It’s On The List

The Pool Specialists began as a service company in 1989 and has grown into a builder and service provider of in-ground concrete pools and spas. Its Hazelwood showroom gives prospective clients an opportunity to view finishes and features before finalizing a gunite pool design.

  • Specializes in custom concrete pools and spas.
  • Provides maintenance, openings, closings, and rehabilitation work.
  • Offers a showroom near St. Louis Lambert International Airport.

5. Diamond Pools

Why It’s On The List

Diamond Pools is a third-generation, family-owned company serving the greater St. Louis area. The company reports that its first pool was built in the early 1960s, that it has installed more than 1,500 pools, and that it still services pools built four decades ago.

  • Builds Aviva fiberglass pools with a published lead time of five to eight months.
  • Offers weekly maintenance plans.
  • Provides equipment repair and stocks Pentair, Century, Polaris, and Rheem products.

6. AACE Pools

Why It’s On The List

AACE Pools is a service-first option for homeowners whose pool needs prompt attention. Its website advertises same-day pool services and same-day free estimates in the St. Louis area.

  • Handles maintenance, repairs, replacements, liner services, heaters, pumps, filters, painting, and seasonal services.
  • Offers weekly maintenance programs and chemical testing.
  • Describes workmanship and labor warranty coverage on pool services.

7. Accurate Pool And Landscape

Why It’s On The List

Accurate Pool and Landscape is worth considering when the pool project is part of a wider outdoor renovation. Its public business profile lists seasonal opening and closing services as well as safety-cover design and installation.

  • Combines pool-related work with landscaping and outdoor-living improvements.
  • Offers seasonal services and safety-cover support.
  • Serves customers across Missouri and Illinois.

How To Choose The Right St. Louis Pool Company

Ask each company which pool materials they install, who handles excavation and drainage, what’s included in the equipment package, and if they will provide startup guidance after completion. Also, request a written scope covering decking, coping, plumbing, electrical work, permits, fencing, cleanup, warranty coverage, and maintenance needs. Address local compliance before excavation. Check construction documents for permits, as requirements vary by municipality. Homeowners should verify setbacks, barriers, drainage, utility locations, and permits with the local authority.

Final Thoughts

St. Louis homeowners have several capable pool companies to consider. Baker Pool Construction, PoolTron, and The Pool Specialists are strong choices for custom concrete projects, while Diamond Pools is particularly relevant for fiberglass installation and equipment support. AACE Pools and Accurate Pool and Landscape bring valuable service-focused and outdoor-renovation capabilities. For the broadest documented mix of pool types, construction, renovation, maintenance, liner work, seasonal service, repairs, and safety covers, Little Giant Pool & Spa is the strongest overall recommendation.