Cost to Level a Subfloor
Leveling a subfloor means exposing the surface, mapping high and low areas with a long level or straight edge, and creating a flat base for new flooring. High spots are sanded on wood or ground on concrete; loose boards are secured, gaps or cracks are sealed, and low areas are filled with floor patch or self-leveling compound.
Common reasons homeowners do this job
- Preparing a flat surface before installing new flooring
- High and low spots across the subfloor
- Loose boards or panels in a wood subfloor
- Gaps or cracks that need sealing
- Damage or debris found after existing flooring is removed
DIY or call a pro?
This is a legitimate DIY project for someone comfortable mapping the floor, sanding or grinding high spots, and applying primer and leveling material. Consider a professional if sanding wood, grinding concrete, or spreading self-leveling compound is outside your comfort level, or if damage is found during inspection. Wear a dust mask or respirator and safety glasses when sanding or grinding, ventilate the area when using compounds and primer, and use knee pads for extended floor work.
Frequently asked questions
- Can I level a subfloor myself, or is it better to hire someone?
- DIY can make sense when the subfloor can be inspected, cleaned, mapped, and repaired by securing loose boards, sealing gaps or cracks, and filling low spots with floor patch or self-leveling compound. Hiring help is worth considering if you are unsure about grinding concrete, sanding wood, or smoothing the compound with a trowel or spike roller.
- What makes subfloor leveling more expensive?
- The price rises with the size of the floor, labor time, and the materials needed, including primer, patch product, self-leveling compound, screws, or plywood where needed. Removing old material can add haul-away or disposal work, while a small area may still involve a minimum or trip charge.
- What should I check before applying self-leveling compound?
- Remove the existing flooring first, then inspect for damage, loose boards, and debris. Map the high and low spots with a long level or straight edge, and thoroughly clean away oil, wax, paint, and adhesives before sealing gaps or cracks and applying floor primer.
- Do high spots get filled or removed when leveling a subfloor?
- High spots are removed rather than filled: sand them on a wood subfloor or grind them on concrete. Low spots are the areas filled with a floor patch product or self-leveling compound, then spread and smoothed before the material dries completely.
Have a different situation?
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