Cost to Add a Bathroom 🚿 – What Homeowners Should Expect

Thinking about adding a bathroom? It’s one of the smartest upgrades you can make, boosting comfort and home value.

The cost to add a bathroom varies widely depending on size, finishes, and whether plumbing is already in place. Homeowners often ask, how much does it cost to add a bathroom or how much will it cost to add a bathroom? Let’s break it down clearly and simply.

Average Cost to Add a Bathroom

Bathroom Type	Average Cost Range	Notes
Half Bath (toilet + sink)	$5,000 – $15,000	Best for small spaces or under stairs
Full Bath (toilet, sink, tub/shower)	$20,000 – $50,000	Increases home resale value significantly
Master Ensuite	$40,000 – $75,000	Luxury finishes and larger footprint
Basement Bathroom	$10,000 – $25,000	Costs rise if new plumbing lines needed

“Adding a bathroom costs more when plumbing lines must be extended or upgraded—so location is key.”

Factors That Influence the Cost

1. Plumbing Location – Adding a bathroom near existing plumbing saves thousands.

2. Size of Bathroom – Larger layouts naturally cost more.

3. Fixtures & Finishes – High-end vanities, tile, and showers increase price.

4. Permits & Labor – Always factor in local building code requirements.

5. Hidden Issues – Water damage, mold, or foundation repairs may add costs.

For example, if you’re finishing a basement, you may also need a basement moisture barrier to prevent water issues before adding plumbing.

Where to Add a Bathroom

• Under Stairs – Great for a compact half bath.

• Basement – Adds functionality and increases resale appeal.

• Converted Closet or Pantry – Ideal for smaller powder rooms.

• Master Bedroom – Turn it into a private ensuite.

If you’re wondering about water safety, check our guide on water in crawl space since moisture issues can complicate basement installations.

Pros and Cons of Adding a Bathroom

Pros:

• Increases home value.

• Boosts convenience for families and guests.

• Improves resale potential.

Cons:

• High upfront cost.

• Can require structural changes.

• May reduce storage or living space.

“Bathrooms are among the most valuable remodels, offering up to a 60% return on investment at resale.”

Tips to Save Money

• Place the new bathroom near existing plumbing.

• Choose mid-range fixtures instead of luxury brands.

• Consider a half bath instead of a full bath if space is tight.

• Plan ahead for proper ventilation to avoid future mold in basement or wall damage.

For more budget clarity on renovation projects, see our guide on changing carpet to hardwood cost.

Conclusion

The cost to add a bathroom typically ranges from $5,000 for a small half bath to $75,000 for a luxury ensuite. The final price depends on location, finishes, and plumbing needs. While the investment is significant, the added convenience and property value often make it worth it. 🏡✨

FAQ

How much does it cost to add a bathroom? On average, $5,000–$50,000 depending on size, plumbing, and finishes.

How much will it cost to add a bathroom in a basement? Expect $10,000–$25,000, often higher if plumbing lines need extending.

Does adding a bathroom add home value? Yes, adding a bathroom can increase resale value by 20% or more.

What’s the cheapest way to add a bathroom? Build near existing plumbing and consider a half bath to save money.