The Ultimate Bathtub Buying Guide: How to Choose the Right Tub for Your Bathroom

Getting a new tub is one of the primary investments in a bathroom remodel. It is also the central visual focus in the room. A well-designed tub serves as an anchor for your design aesthetic while providing a place for relaxation at the end of a long day.

Determining how to choose a bathtub might seem simple on the surface. However, matching tub measurements to existing plumbing setups, calculating weight loads, and selecting durable materials require careful planning. What worked in home construction decades ago often differs from modern manufacturing standards.

Whether you are completing a straightforward bathtub replacement or redesigning your entire floor plan, this comprehensive bathtub buying guide covers the essential technical considerations you need to review before making a final selection.

1. Budgeting and Scope Planning for a High-Quality Bathtub

Bathtub projects frequently fall within broader renovation estimates. When unexpected plumbing or tile work occurs during demolition, the allocation for the tub itself often gets trimmed down. This can force homeowners to compromise on material strength, insulation, or ergonomic design.

When buying a bathtub, consider it a long-term fixture that should last 15 to 20 years or more. Basic units made from thin acrylic or standard fiberglass can flex under weight, retain heat poorly, and scratch easily over time. Investing in a unit with the features of a high-quality bathtub made from solid cast mineral composites, heavy-gauge enameled steel, or thick sanitary acrylic protects your home investment over time.

Plan for these primary project components during initial project setup:

• Tub Fixture Selection: Basic acrylic replacement models differ significantly in material thickness and long-term finish durability compared to premium mineral composite or cast iron soaking tubs.
• Drain & Rough-In Plumbing: Simple pipe alignment adjustments for a standard swap require far less labor than relocating drain and supply lines to a new position in the room.
• Installation & Structural Support: Standard alcove installations require basic mounting, while heavy cast iron fixtures or center-room freestanding setups demand extra structural prep.
• Surround & Tile Wall Integration: Simple acrylic surround panels install quickly, whereas custom stone or ceramic tile enclosures require detailed backing preparation.

2. Comparing the Different Types of Bathtubs

Understanding how different types of bathtubs fit into your floor plan helps narrow down your choices quickly. Tub classification is primarily determined by installation style and wall placement.

Alcove (Recessed) Tubs

 The alcove model remains the most common layout in standard residential construction. Installed between three joining walls, alcove tubs typically measure 60 inches in length and frequently combine an overhead showerhead to conserve floor space.

Drop-In and Undermount Tubs

 Drop-in models sit inside a custom-built frame or deck structure, leaving the rim exposed. Undermount tubs install beneath a finished stone or tile deck surface for a seamless edge. Both styles allow flexibility in room positioning, provided you build a supportive deck enclosure.

Freestanding and Soaker Tubs

 Freestanding tubs rest directly on the bathroom floor without requiring adjacent wall support. Soaker and deep garden tubs fall into this category, offering deeper water capacities that allow full-body immersion. These models serve as a striking focal point in master suites.

Corner Tubs

 Designed in a triangular or five-sided layout, corner tubs fit into two meeting walls. They provide generous interior basin space and integrated seating, making them ideal for large square floor plans.

3. Getting Key Dimensions of a Standard Bathtub Right

When choosing a bathtub, evaluating height, overall length, exterior width, and interior basin depth ensures two critical goals: comfort for the bather and adequate physical clearance within the room.

The dimensions of standard bathtub models usually measure 60 inches long by 30 inches wide by 14 to 16 inches deep. However, deeper soaking units range from 66 to 72 inches long, 32 to 36 inches wide, and up to 22 inches deep.

Measurement Tip: Interior basin size differs noticeably from exterior footprint dimensions. Always review the specification sheet for internal floor length and soaking depth, which measures the distance from the bottom of the tub to the overflow drain.

Before purchasing, verify three physical space constraints:

1. Doorway & Stairwell Widths: Confirm that the boxed unit can navigate tight hallways and door frames during delivery.
2. Door Swing Clearances: Ensure opening cabinet doors and glass shower enclosures clear the edge of the tub.
3. Internal Ergonomics: Taller users need at least 66 inches of outer length to stretch out comfortably without knees bent.

4. Assessing Floor Space, Load Weight, and Plumbing

The footprint of a tub impacts structural floor joists and plumbing connections differently depending on the design you pick.

Floor Structural Load

Water weighs approximately 8.34 pounds per gallon. A large soaking tub holding 70 gallons of water carries substantial weight in liquid alone. Add the physical weight of the tub, which varies from lightweight acrylic to heavy cast iron or solid mineral composite, plus an adult bather, and the combined weight sits on a concentrated floor section.

If you are installing cast iron or stone composite on a second-story floor, consult a contractor to check whether your floor joists require extra bracing.

Base Footprint vs. Top Rim

Freestanding and clawfoot designs often have base footprints smaller than their top rim dimensions. Take measurements at both floor level and shoulder level. You must also confirm that subfloor plumbing accesses align properly with the waste and overflow lines.

5. Evaluating Key Bathtub Features & Materials

Reviewing essential bathtub features ensures long-term ease of maintenance and warmth retention. Pay close attention to these structural components:

Construction Materials & Heat Retention

• Acrylic: Lightweight with a smooth surface and moderate heat retention. Easy to clean, but prone to scratching if cleaned with abrasive scrubbers.
• Cast Iron with Enamel: Highly durable and retains heat remarkably well, but heavy to transport and install.
• Solid Mineral Composite: A blend of natural ground minerals and high-performance resins. Solid throughout, highly resistant to scratches, non-porous, and exceptional at keeping water warm for extended periods.

Drain & Overflow Configuration

Drain locations are categorized as left-hand, right-hand, or center drain. Standard alcove replacements require matching your new tub drain orientation to your existing subfloor pipe layout. Center drain setups work well for double-ended soaking tubs where bathers lean back on either side.

Faucet Placement Options

Determining where your faucet mounts dictates rough-in plumbing behind the walls:

• Deck-Mounted: Installs directly onto the rim of the tub or surrounding deck.
• Wall-Mounted: Extends from an adjacent wall, saving tub deck space.
• Freestanding Floor-Mounted: Stems directly up from the floor beside a standalone tub.

Featured Pick: MTI Helena Freestanding Tub

For homeowners seeking a balance of ergonomic design, material strength, and timeless styling, the MTI Helena Freestanding Tub stands out as an exclusive selection at Coburn’s.

• Outer Footprint: 66 inches Long x 31 inches Wide x 22.5 inches Deep
• Interior Basin: 49 inches Long x 20 inches Wide x 19 inches Soaking Depth
• Material Composition: Handcrafted Mineral Composite made from ground Georgia minerals
• Drain Arrangement: Center Waste with Integrated Low-Profile Overflow
• System Options: Available as a classic soaker or equipped with air massage hydrotherapy

Why the MTI Helena Excels:

1. Solid Mineral Composite: Formulated from natural minerals mined in Georgia combined with binding resins, creating a solid, non-porous material through its entire cross section.
2. Superior Insulation: Holds water heat significantly longer than standard acrylic units without requiring continuous hot water top-offs.
3. Symmetrical Center Drain: The central drain and integrated overflow allow comfortable bathing facing either direction without resting against plumbing hardware.
4. Therapeutic Options: Available as a quiet soaker or equipped with an air massage system for targeted joint relief.

Step-by-Step Selection Process

1. Measure Your Space: Measure the room’s length, width, and height. Check doorway and hallway clearances so the tub fits during delivery.
2. Check Plumbing Layout: Note whether you need a left, right, or center drain. Locate your water supply lines for wall, deck, or floor faucets.
3. Choose Style & Material: Select an alcove, drop-in, or freestanding tub. Pick cast iron or mineral composite for long-lasting water warmth.
4. Verify Floor Support: Ensure your floor joists can support a full tub of water. Match your plumbing rough-ins to your new hardware.

Final Checklist Before Buying

Before finalizing your order, verify these key project parameters:

• Measured entryway doors and hallway corners along the delivery route.
• Confirmed drain orientation matches subfloor piping (Left, Right, or Center).
• Verified floor framing load capacity for heavy composite or cast iron units.
• Selected faucet mounting style (Floor mounted, Wall mounted, or Deck mounted).
• Confirmed total soaking depth meets personal comfort expectations.

Plan Your Bathroom Project with Experts

Selecting the ideal bathtub requires matching material durability, room layout, and rough-in plumbing specifications. Viewing tubs in person helps you test basin ergonomics, review finish options, and verify precise measurements before ordering.

Stop by your local Coburn’s Kitchen & Bath Showroom to examine live display units, compare mineral composite materials, and speak directly with experienced bath consultants.