Can You Get Custom Shower Sizes? The Power of Syn-Mar’s Custom Bases & A-La-Carte Options

October 26, 2026

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When planning a bathroom renovation, homeowners often run into the same frustrating roadblock: standard, off-the-shelf shower pans and wall kits simply do not fit their existing layout. Whether you are dealing with an awkward off-center drain, an unusual curb placement, or a non-standard alcove footprint, forcing a cookie-cutter unit into a custom space usually leads to expensive structural adjustments or compromised designs.


At Syn-Mar Products, one of the most frequent questions we receive from homeowners and contractors is: "Can you make custom sizes?"


The answer is a resounding yes. Manufactured at our Tolland County facility in Connecticut, our high-quality custom shower bases and grout-free shower wall systems are designed to fit virtually any floor plan. Even better, our entire product catalog is completely a-la-carte, giving you total freedom to order only the exact components your bathroom remodel requires.

1. "Can You Make Custom Sizes?" Yes, Engineered for Virtually Any Floor Plan

Standard big-box store shower kits force you to adjust your bathroom framing and plumbing around their pre-molded dimensions. Syn-Mar flips that approach on its head.

Glass shower stall with gray stone walls, chrome hardware, a towel bar, and a wooden shower floor.

Tailored to Your Specific Layout

Our custom shower bases can be manufactured to match your exact floor plan specifications. This custom approach eliminates the need for contractors to tear out framing or relocate existing plumbing lines just to fit a standard pan. 


  • Flexible Drain Placement: Keep your existing drain location intact, saving significantly on plumbing relocation costs.


  • Multiple Threshold & Curb Options: We offer three different curb heights to accommodate your home's exact needs.


  • Precise Footprints: From tight corner layouts to expansive master suite walk-ins, every base is custom cast for a precise fit. 

2. The Power of A-La-Carte Customization

Unlike brands that force you into buying restrictive all-in-one shower bundles, Syn-Mar products are offered completely a-la-carte. You have full control over mixing and matching components to build a bath system that fits your style and budget. 

Mix and Match Grout-Free Walls with Tile

You don't have to choose between an all-grout or zero grout shower. If you love the look of a custom tile feature wall but want to eliminate the risk of a leaky, hard-to-clean tiled shower floor, you can order just a Syn-Mar custom shower base. Our bases pair seamlessly with traditional tile or alternative wall systems. 

Chrome shower head and handheld shower against a light gray tiled bathroom wall

Complete Control Over Accessories & Add-Ons

With our a-la-carte system, you choose only the components you actually want:


  • Custom Shower Walls: Full-height, grout-free shower wall panels hand-cast in rich colors. 



  • Integrated Accessories: Add color-matched recessed niches, soap dishes, shampoo caddies, or corner footrests wherever you want them. 


  • Seamless Vanity Tops: Extend your design beyond the shower stall. Complete your bathroom by adding a custom seamless vanity top cast as a single solid piece with an integrated sink for a unified, elegant look. 

3. How We Manufacture Custom Strength and Beauty

Our ability to deliver custom dimensions without sacrificing structural integrity comes down to our rigorous manufacturing process. Every custom base, wall panel, and vanity top is hand-cast with care in our Connecticut plant. 


  • Precision Batching & Mixing: We mix proprietary formulas of resins, pigments, and stone fillers to achieve deep color consistency and long-lasting durability across all custom components. 


  • Casting and Vibrating: Once the mixture is hand-cast into the custom mold, it undergoes a vigorous 10–12 minute vibration process. This crucial step forces trapped air bubbles to escape, resulting in a dense, solid piece that resists moisture and wear. 



  • Quality Assurance: After curing and demolding, each item is finished by hand and backed by our 5-year warranty. 

4. The 4 Steps to Buying Your Custom Syn-Mar Shower

Because we are dedicated strictly to product manufacturing, we do not sell retail directly to the public or handle home installations. We work through a trusted network of retail partners to bring your vision to life. Following this standardized 4-step process ensures a seamless upgrade: 

Bright kitchen with white cabinets, wooden island, pendant lights, and a window by the sink.
  1. Plan and Measure: Work with your professional contractor to evaluate your bathroom, note existing curb placement, locate drains, and measure your space. 

  2. Find a Dealer: Use our online Find a Dealer tool to locate an authorized premium dealer showroom in your area across New England, NY, NJ, or PA.

  3. Choose Custom Options: Visit the premium dealer showroom to explore our color samples, select custom shower base dimensions, choose your wall panel style, and add a-la-carte accessories.

  4. Order the Products: Your contractor or showroom partner places the order directly with Syn-Mar. We manufacture your custom components and deliver them safely on our own trucks so your contractor can complete the installation. 

Frequently Asked Questions

  • Can I order a custom Syn-Mar shower base if I plan on tiling my shower walls?

    Yes! Because our products are available a-la-carte, you can purchase a custom Syn-Mar shower base to ensure a leak-proof, easy-to-clean foundation while installing custom tile on the surrounding shower walls.   

  • How do I measure my space for a custom shower base size?

    Syn-Mar custom shower bases install stud-to-stud, therefore, the stud-to-stud dimensions are required. We recommend working alongside a professional contractor experienced in installing grout-free shower systems. They will measure your existing shower footprint, verify curb placement, and mark exact drain locations before submitting final dimensions to your local premium dealer showroom.   

  • Does Syn-Mar make matching vanity tops for custom shower systems?

    Yes. We manufacture seamless vanity tops cast as a single solid piece with an integrated sink. These can be custom-ordered in colors that perfectly match or complement your grout-free shower walls and base.   

  • Can I purchase custom-sized shower components directly from the Syn-Mar factory?

    No. Syn-Mar Products is strictly a manufacturer. To order custom bases, grout-free wall panels, or accessories, visit our website to connect with an authorized premium dealer showroom in your area.   

Why Choose Syn-Mar?

Syn-Mar Products is a third-generation, family-owned manufacturer of grout-free shower systems, custom shower bases, and seamless vanity tops. Since 1977, we've manufactured engineered stone products in Connecticut and proudly supplied dealer partners throughout the Northeast.


We operate strictly as a direct manufacturer, not a remodeler or installer. For our B2B plumbing wholesalers and showroom partners, this means we sell direct to you—unlike competitors who rely on middle-man distribution companies. We stand behind our high-quality craftsmanship with a 5-year warranty.

Ready for a Beautiful, Grout-Free Bathroom?

Syn-Mar products are supplied exclusively through our trusted network of B2B dealer partners. If you are a homeowner looking to upgrade your space with White Onyx, connect with an authorized dealer today. 


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