Subfloor Repair or Replacement

We specialize in subfloor repair and replacement services that address these common but often overlooked problems. A properly functioning subfloor is the foundation of beautiful, long-lasting flooring, providing stability and support for whatever finish flooring you choose.


Many homeowners in the Bay Area face subfloor issues due to moisture damage, pests, or simply the passage of time. We've seen everything from minor repairs to complete replacements needed in homes throughout San Francisco. Our team is equipped to identify the root causes of your floor problems and provide effective solutions that last.


We understand that subfloor work can seem intimidating, but our experienced technicians make the process straightforward. Before installing new hardwood, laminate, or any other flooring material, we ensure your subfloor is solid and level. This prevents future problems like squeaky floors, uneven surfaces, or premature wear of your finish flooring.

Processes and Techniques

At San Francisco Flooring Company, we follow specific procedures to repair or replace damaged subfloors. Our techniques ensure your floor has a solid foundation that will last for years to come.

Subfloor Repair Techniques

We start every repair with a thorough inspection to identify all damaged areas. Our team looks for water damage, rot, squeaks, and uneven spots that might affect your floor's stability. Moisture testing is essential to prevent future problems, so we use specialized meters to check moisture levels.


For partial repairs, w remove the damaged sections without disturbing the surrounding areas. This precision approach saves time and money. Small sections with minor damage often require simple reinforcement with additional screws or brackets to eliminate squeaks.


For moderate damage, we cut out and replace only the affected areas using matching materials. We then secure the new sections to existing joists with proper fasteners and ensure they're level with the surrounding subfloor.

Full Subfloor Replacement Process

When damage is extensive, a complete replacement becomes necessary. We first remove all floor coverings and the damaged subfloor. This gives us access to inspect the joists underneath, which may also need repair or reinforcement.


Next, we measure and cut new subfloor materials to fit your space perfectly. We typically use plywood or OSB (oriented strand board) of appropriate thickness based on your home's structure and the planned floor covering.


We ensure the new subfloor is level before finishing. This step is crucial for the longevity of your new flooring. A level subfloor prevents uneven wear and potential damage to your finished floors.

How to Assess Your Subfloor's Condition

Our team uses specialized tools and techniques to accurately determine the extent of damage and develop the most effective solution.

Initial Assessment and Free Consultation

At San Francisco Flooring Company, we start with a comprehensive free consultation to evaluate your subfloor concerns. When you contact us, we'll schedule a convenient time to visit your home and assess the situation. We look for visible signs of damage such as:


  • Squeaky or bouncy floors
  • Uneven surfaces
  • Visible water damage or mold
  • Cracks or soft spots


We take detailed photos to document the condition and measure moisture levels with specialized tools. This helps us understand what might be happening beneath your flooring. Our technicians will discuss their findings with you and explain potential issues in clear, understandable terms. We believe in transparency and will never recommend unnecessary work.

In-Depth Subfloor Inspection Methods

Once we identify potential problems, we conduct a thorough inspection using advanced techniques. We may need to remove a small section of your current flooring to fully examine the subfloor structure. Our inspection methods include:


  1. Moisture testing - We use moisture meters to detect hidden water damage that can lead to mold or rot
  2. Structural assessment - We check for proper joist spacing and support
  3. Deflection testing - We measure how much your floor flexes under weight


We also assess the subfloor material itself. Different materials like plywood, OSB, or concrete each have specific issues to watch for. For older homes in San Francisco, we're particularly attentive to previous repair work that may not meet current standards. After our detailed inspection, we'll provide you with a clear report of our findings and a recommendation for repair or replacement options.

How to Prepare for Subfloor Repair or Replacement

Furniture and Fixture Considerations


Before we arrive for subfloor repair or replacement, you'll need to clear the work area completely. Remove all furniture, appliances, and decorative items from the room. For larger pieces that are difficult to move, we can assist, but please inform us in advance. Built-in fixtures may need special attention. Toilets, vanities, and kitchen islands often must be temporarily removed to access the subfloor beneath them. This is especially important in bathroom renovations where water damage is common.


Store your belongings in a dry, secure area away from the construction zone. We recommend covering items in nearby rooms with plastic sheeting to protect from dust that may travel. Electronics and valuable items should be removed even from adjacent rooms as a precaution against accidental damage or dust infiltration.


Safety Measures and Dust Management


Subfloor work creates significant dust and debris. We use professional dust containment systems, but additional preparation helps maintain air quality in your home. Seal off doorways to unaffected rooms with plastic sheeting and painter's tape. This creates a barrier that prevents dust from spreading throughout your house. Consider covering vents in the work area to prevent dust from entering your HVAC system.


For homes built before 1978, we test for lead paint and asbestos before disturbing any materials. This safety step protects both your family and our workers from harmful exposure. Turn off HVAC systems during the dustiest phases of work. We recommend replacing your air filters after project completion. People with respiratory conditions may want to arrange alternative accommodation during the demolition phase. We provide advance notice about any utility shutoffs needed during the repair process, particularly for bathroom or kitchen subfloor work.

FAQs About Subfloor Repair or Replacement

Subfloor repair and replacement projects involve many considerations including costs, timelines, and materials. Here are answers to common questions our customers ask about this important home improvement service.

  • What is the typical cost range for repairing or replacing a subfloor by a professional flooring company?

    Subfloor repair costs typically range from $500 to $2,500 for partial repairs in San Francisco. Complete subfloor replacement can cost between $2,000 and $7,000 depending on square footage and complexity. The price varies based on the extent of damage, accessibility, and material choice. At San Francisco Flooring Company, we provide detailed estimates after inspecting the damage.

  • How long does it generally take to replace a damaged subfloor in a residential property?

    Most subfloor repairs take 1-3 days to complete. A full subfloor replacement for an average room might take 2-5 days. Complex jobs involving multiple rooms or extensive water damage may require 1-2 weeks. We always provide a timeline estimate before starting work so you can plan accordingly.

  • What are the signs that indicate a subfloor needs repair or replacement?

    Squeaky or bouncy floors often indicate subfloor issues. Uneven surfaces or sagging areas are also common warning signs. Visible water stains on ceilings below or musty odors might suggest water damage to the subfloor. Cracked tiles or warped hardwood could point to subfloor problems underneath. If your floor feels soft or spongy when walking, this typically indicates rotting or weakened subfloor materials that need attention.

  • Can water-damaged subfloors be repaired, or do they always need to be replaced?

    Minor water damage can sometimes be repaired rather than replaced. Small affected areas can be dried and treated with antimicrobial solutions. Moderate to severe water damage almost always requires replacement. Rotted wood cannot regain its structural integrity and can harbor mold growth. We assess each situation individually to determine if repair or replacement is the most appropriate solution for your specific circumstances.

  • Is it possible to live in the home while a subfloor repair or replacement is being conducted?

    Yes, most households remain in their homes during subfloor repairs. The work is typically limited to specific rooms, allowing you to use other areas of your home. For extensive projects, we recommend limiting foot traffic in work areas. Dust barriers and careful planning help minimize disruption to your daily life. Some complex projects may create noise and dust that make staying elsewhere more comfortable, but this is rarely required for standard repairs.

Still have a question?

Give us a call.