Compare Subfloor Replacement Quotes in St. Louis
Vetted structural specialists—not flooring installers who "can figure it out."
Your Flooring Is Only as Good as Your Subfloor
That $15,000 hardwood floor you're planning? It'll buckle and warp if it's installed over a compromised subfloor. And that "flooring specialist" who said they could handle the subfloor work? They're probably planning to screw new plywood over rotted wood.
Subfloor replacement isn't flooring work—it's structural work. It requires understanding how the subfloor connects to the joists, where moisture is coming from, and how to create a solid, level foundation for your finish floor.
The contractors in our directory specialize in structural wood repair. They'll address the root cause of your subfloor damage, not just cover it up with new material.
Why Our Vetting Process Matters
- 🛡️Licensed & Insured
Every contractor carries proper licensing and minimum $1M liability coverage.
- 💧Moisture Mitigation
Our pros identify water sources and install proper vapor barriers—not just new plywood.
- ⭐Verified Reviews
Real reviews from homeowners with completed subfloor projects.
- 📐Structural Understanding
Knowledge of joist systems, load distribution, and proper attachment methods.
Warning Signs of Subfloor Damage
- Soft or spongy spots when walking
- Squeaking or creaking with every step
- Visible water stains on ceiling below (if applicable)
- Musty or moldy smell from floor area
- Tile cracking or grout failing in bathroom/kitchen
- Flooring that's warped, buckled, or separating
- Visible mold or discoloration on exposed subfloor
Frequently Asked Questions
How much does subfloor replacement cost?
Subfloor replacement in St. Louis typically costs $3-$10 per square foot for materials and labor, or $500-$800 per 4x8 sheet installed. A typical bathroom subfloor replacement runs $500-$1,500, while a full room can cost $2,000-$5,000+.
How do I know if my subfloor needs replacement?
Signs include soft or spongy spots when walking, squeaking or creaking floors, visible water stains on ceilings below, musty odors, or flooring that is warped, buckling, or separating from the subfloor.
Can damaged subfloor be repaired instead of replaced?
Minor damage can sometimes be reinforced with additional plywood. However, if the subfloor is water-damaged, rotted, or structurally compromised, full replacement is necessary. Patching wet or rotted wood leads to continued deterioration.
What type of subfloor material is best?
For most applications, 3/4" tongue-and-groove OSB or plywood rated for structural use is recommended. For bathrooms and kitchens, moisture-resistant or treated plywood provides additional protection.
Fix Your Subfloor Right—Before Installing That New Floor
Get matched with a structural specialist who builds a solid foundation, not a flooring installer who cuts corners.