Cost of adding a bathroom — St. Louis, MO

Last updated: September 24, 2026

What affects the price

Remodeling costs vary based on your specific goals. Choosing high-end materials like natural stone or premium fixtures will shift your budget higher, while selecting standard options helps keep things affordable. The biggest price factor is the scope of work; a simple tub-to-shower conversion costs significantly less than a total gut renovation that moves plumbing lines or electrical outlets. Structural repairs found behind old walls can also influence the bottom line. We provide exact pricing confirmed free on the call.

About this service

The cost of adding a bathroom is generally the most significant investment, as it involves creating new plumbing lines, ventilation, and electrical circuits. Because you are essentially carving a new room out of existing square footage, structural work is often required.

Frequently asked in St. Louis

Also serving nearby: O Fallon · Springfield · Columbia · Champaign · Peoria

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More on this: EPA WaterSense bathroom — fixture savings.

Service area details

Serving all of St. Louis — population 281,754; about 4,565 residents per square mile across 61.7 sq mi.

Neighborhoods served in St. Louis: Tower Grove, The Hill, Central West End, Soulard, Benton Park — and every surrounding area.