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How Much Does a Basement Bathroom Cost in Utah?

Upterra Builders · May 20, 2026

In most newer Utah homes, especially throughout Tooele County, basement bathrooms are typically planned during the original construction of the home. That means rough plumbing is often already stubbed in for a future bathroom addition.

Because of that, most basement bathroom projects we complete do not require major concrete cutting or extensive underground plumbing work.

Realistic Basement Bathroom Pricing in Utah

Here is a realistic pricing range for a basement bathroom project:

• Half bath (toilet and sink): $5,000 to $9,000
• Full bath (toilet, sink, shower): $9,000 to $16,000
• Full bath with tub and shower combo: $11,000 to $18,000
• Luxury full bath: $18,000 to $30,000+

These ranges include framing, electrical, drywall, waterproofing, tile, ventilation, fixtures, and finish work.

Costs can still vary depending on:

• Tile and fixture selections
• Shower size and layout
• Custom cabinetry or glass work
• Distance from existing plumbing connections
• Ventilation and electrical upgrades

If rough plumbing is already present, homeowners can often save several thousand dollars compared to a basement bathroom that requires cutting the slab and installing entirely new drain lines.

Plumbing: Why Stubbed-In Bathrooms Change Everything

One of the biggest cost factors in a basement bathroom addition is whether plumbing already exists below the slab.

Fortunately, many Utah builders install future bathroom rough-ins during initial construction. These rough-ins typically include:

• Drain lines
• Vent connections
• Toilet flange location
• Water supply access

When these are already in place, adding a basement bathroom becomes much more straightforward:

• Little to no concrete cutting
• Faster installation timeline
• Lower labor costs
• Fewer plumbing complications

In these situations, the project functions much more like finishing a standard bathroom rather than building one entirely from scratch.

If plumbing is not already stubbed in, costs increase significantly due to slab cutting and underground drain installation, but that is far less common in newer Utah homes.

Do You Need a Permit for a Basement Bathroom in Utah?

Yes. Any new bathroom addition, above or below grade, requires a permit in Utah. In Tooele County, you will need:

• A building permit for the overall bathroom construction
• A plumbing permit, required separately for any new plumbing work
• Inspections at rough-in and final stages

Permit fees in Tooele County typically run $400 to $900 for a bathroom addition project. Your licensed contractor should pull all permits. This protects you legally and ensures the work is inspected correctly.

A basement bathroom added without permits creates real problems at resale. Buyers' home inspectors will flag unpermitted work, and lenders may require remediation before financing.

What About a Basement Bathroom in a Rental or ADU?

If you are adding a basement bathroom as part of a basement apartment or accessory dwelling unit (ADU), there are additional considerations:

• The bathroom must meet egress and ventilation requirements for a habitable rental unit
• Utah's ADU regulations have evolved, so check current Tooele County zoning rules before proceeding
• A separate entrance and proper egress windows will also be required for a legal rental unit

This is a topic worth discussing in detail with your contractor before breaking ground.

What the Process Looks Like

Here is the typical sequence for a basement bathroom addition at Upterra:

1. Consultation and design. We walk the space, discuss fixture placement, and assess plumbing options.
2. Permit application. We submit plans and pull permits before any work begins.
3. Concrete cutting and plumbing rough-in. The most disruptive phase, usually 2 to 4 days.
4. Framing and drywall. Walls go up, with cement board behind tile areas.
5. Electrical rough-in. GFCI outlets, exhaust fan, lighting circuit.
6. Tile and waterproofing. Shower pan, floor tile, waterproof membrane.
7. Fixture installation. Toilet, vanity, shower fixtures, mirror.
8. Final inspection and punch list.

Total timeline for a basement bathroom addition, from permit to final inspection, is typically 6 to 10 weeks, depending on permit timing and material lead times.

Ready to Add a Bathroom to Your Basement?

A basement bathroom is one of the highest-ROI additions you can make to a Utah home, since it expands functionality and appeals to potential buyers while enabling multiple uses for unfinished spaces.

Upterra Builders handles basement bathroom additions throughout Tooele County and surrounding communities. We pull permits, engage licensed plumbers and electricians, and guarantee our workmanship.

Upterra Builders serves Tooele City, Stansbury Park, Grantsville, Erda, Stockton, and surrounding Tooele County communities. Licensed and insured in Utah.