How Much Does It Cost to Repair a Subfloor?

Average range: $250 - $750
Low
$150
Average Cost
$500
High
$2,000
(Fixing a water-damaged 150 sq.ft. section of subfloor)

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How Much Does It Cost to Repair a Subfloor?

Average range: $250 - $750
Low
$150
Average Cost
$500
High
$2,000
(Fixing a water-damaged 150 sq.ft. section of subfloor)

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Reviewed by Isabel Maria Perez. Written by Fixr.com.

Subflooring is the layer of flooring under the surface level, providing extra support to the structure and an even flat surface to place your top-level flooring materials like vinyl, tiles, or wood planks. Subfloors can be damaged from various factors, including age, water exposure, and termite infestations. When this happens, it is recommended to fix them as soon as possible.

The national average cost of subfloor repairs is between $250 and $750, with most homeowners paying around $500 to fix a 150 sq.ft. water-damaged section of subflooring. This project’s low price is $150 for patching a small hole. The high cost is $2,000 for fixing and reinforcing large sections of a sagging subfloor.

Subfloor Repair Cost

Cost to Fix Subfloor
National average cost$500
Average range$250-$750
Minimum cost$150
Maximum cost$2,000


Subfloor Repair Cost by Project Range

Low
$150
Patching a small hole in the subfloor
Average Cost
$500
Fixing a water-damaged 150 sq.ft. section of subfloor
High
$2,000
Repairing and reinforcing a large section of sagging subfloor

Cost to Repair a Subfloor by Material

Subfloors 1 can be made from a wide range of materials like plywood and concrete. The material impacts the price of your repairs because certain materials are cheaper and easier to work with. The table below shows common materials and the average costs to fix each for a typical subfloor of between 100 and 300 sq.ft. in rooms like the living room and bedroom.


Cost to Repair High-Perfomance Subfloor Panels, OSB, Plywood, or Concrete Subfloor

Cost to Repair High-Perfomance Subfloor Panels, OSB, Plywood, or Concrete Subfloor


MaterialAverage Costs (Labor Included)
High-Performance Panels$200 - $1,000
OSB$250 - $750
Plywood$250 - $850
Concrete$350 - $1,250


High-Performance Subfloor Panels Repair Price

Homeowners pay between $200 and $1,000 to fix high-performance subfloor panels. The wide price range is because there are various high-performance floor panels, and some are more expensive to fix. High-performance panels are a popular and modern choice for installations, made with high precision and refined materials to offer strength and stability. However, these floors are prone to water damage and sagging.

OSB Subfloor Repair Price

The average price for OSB (Oriented Strand Board) subfloor repairs ranges from $250 to $750. OSB is one of the cheapest options for installations, offering a similar level of strength and reliability to plywood but being slightly more prone to water damage. However, this material must be treated with care because it is very susceptible to water damage and suffers issues like warping, swelling, and rot.

Plywood Subfloor Repair Price

Repairing a plywood subfloor averages $250 to $850. Plywood 2 is the most common and toughest material for installations. It is highly versatile and easy to work with, but there is always a risk of being damaged from water, rot, and termite exposure.

Concrete Subfloor Repair Price

Homeowners pay between $350 and $1,250 to fix their concrete subfloor. They are immensely strong, stable, and long-lasting, and you should not worry about wood-related issues like rot and mold. However, these floors still must be sealed and protected against moisture and are expensive to fix if they crack or weaken.


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Cost to Fix a Subfloor by Location

Subfloors are found in various locations, including the living room, bedroom, bathroom, and kitchen. The average price for fixing subfloors is between $250 and $850, but the prices are higher if it is hard-to-access, which often happens in rooms like bathrooms and kitchens. The table below shows common locations and the average repair prices for each.


Cost to Repair a Subfloor in a 25x100 Sq.Ft. Mobile Home, 35x75 Sq.Ft. Bathroom, or 100x175 Sq.Ft. Kitchen

Cost to Repair a Subfloor in a 25x100 Sq.Ft. Mobile Home, 35x75 Sq.Ft. Bathroom, or 100x175 Sq.Ft. Kitchen


LocationAverage Costs (Labor Included)
Mobile Home (25 - 100 sq.ft.)$250 - $900
Bathroom (35 - 75 sq.ft.)$300 - $950
Kitchen (100 - 175 sq.ft.)$350 - $1,200


Mobile Home Subfloor Repair Cost

Homeowners pay between $250 and $900 to fix a mobile home subfloor. They can be difficult to access, and you have to be careful when removing flooring sections due to plumbing pipes and electricity wires. They are at risk of various issues like water damage and rot.

Cost to Repair a Bathroom Subfloor

The cost to fix a bathroom subfloor ranges between $300 and $950. Bathroom floors can have tiles and different materials and piping underneath the floor, so great levels of care and attention are required when making adjustments and repairs. There is also a high risk of water damage in the bathroom from the high moisture levels and possible leaks.

Kitchen Subfloor Repair Price

Fixing a kitchen subfloor averages $350 to $1,200. Like bathrooms, kitchens can have different flooring materials that may make it hard to access, leading to higher labor prices and more time required to fix common problems. There is also a higher-than-average risk of water damage in kitchens.

Cost to Repair a Subfloor by Type of Repair

Various issues arise with subfloors. For example, it might develop holes that need to be patched or start sagging in certain areas. It might also suffer from joist problems, water damage, rot, or termites. The problem type impacts the repair prices because some issues are cheaper and easier to fix. The table below shows examples and average repair prices for each.


Cost to Repair a Subfloor by Type of Repair: Crack, Squeaky, Rot, Mold, Sagging, Uneven, Termite Damage...

Cost to Repair a Subfloor by Type of Repair: Crack, Squeaky, Rot, Mold, Sagging, Uneven, Termite Damage...


TypeAverage Costs (Labor Included)
Hole$150 - $600
Crack$150 - $600
Joist$200 - $400/each joist
Squeaky$200 - $1,000
Water Damage$250 - $750
Rot$250 - $1,000
Mold$350 - $1,300
Sagging$400 - $2,000
Uneven$400 - $2,000
Termites$500 - $700


Repair a Hole in a Subfloor

Homeowners pay between $150 and $600 to professionally fix a hole in the subfloor. Holes may appear from rot or impacts and accidents on the floor. The price mostly depends on the hole size and accessibility. Small holes can be filled or patched with putty or patching materials, but the damaged section may need to be removed and replaced for larger holes.

Crack in a Subfloor

Expect to pay between $150 and $600 to fix a crack in the subfloor. The prices are usually lower if you spot and fix cracks early. Cracks can appear from water damage, swelling, and changing temperatures. A contractor usually fills or patches cracks with putty or filler material to fix them.

Subfloor Joist Repair

Fixing subfloor joist costs between $200 and $400 for each joist. Joists are the boards running horizontally underneath it, supporting the weight of the flooring, furniture, and room above. They are critical to the floor’s strength and solidity, but they can be damaged from pressure and moisture exposure. A common repair method is sistering, which is when joists are reinforced with extra materials.

Fix a Squeaky Subfloor

The average price to fix a squeaky subfloor is between $200 and $1,000. There can be many causes for this, and some are cheaper to fix than others. Squeaky floors could be caused by uneven sections or water damage from spillage or excess humidity. The repair type depends on the problem’s cause.

Subfloor Water Damage Repair Cost

Water-damaged subfloors average $250 to $750 for fixes. Water can damage subfloors when left unchecked, so act fast if you spot signs of water damage. Usually, a contractor removes the damaged sections and replaces them with new ones. A sealant may also be needed to prevent future damage.

Rotted Subfloor Repair

It costs $250 to $1,000 to professionally fix a rotted section of the subfloor. The prices can be higher, depending on the extent of the rot and if it spread to surrounding areas. When rot is spotted early, it is cheaper to fix by removing the rotted sections, installing new materials, and applying a sealant to prevent further water damage.

Mold on a Subfloor

Homeowners pay between $350 and $1,300 to treat and remove mold in their subfloor, but prices can be significantly higher if it affects a large area. Mold can be a problem on subflooring layers exposed to excess moisture and heat, such as in bathrooms and kitchens. The flooring must be removed, and mold treatment solutions applied to the area to fix the issue.

Sagging Subfloor

Fixing a sagging subfloor ranges from $400 to $2,000. The final price mostly depends on the size of the sagging issue. Sagging often occurs from weaknesses in the joists or damages from moisture. The joists may need to be reinforced, support columns or steel jacks might need to be installed, or other measures may be taken to lift the sagging subfloor.

Fix an Uneven Subfloor

Prices average $400 to $2,000 to fix an uneven subfloor. This problem is easy to identify because the floor does not feel straight or balanced in areas, and it may seem to dip or sag randomly. This may be solved by sistering or reinforcing the joints or installing supporting structures like jacks and columns to even it.

Subfloor Termite Damage

Homeowners pay between $500 and $700 to fix subfloor termite damage. This can be one of the more expensive repair jobs for subfloors. Act fast if you notice signs of termite damage to prevent the issue from becoming worse. An exterminator must remove the termites, and a termite treatment is applied to prevent them from coming back. Damaged sections also need patching.


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Cost to Repair a Subfloor by Solution

Professional contractors and specialists might use various methods to fix your subfloor. They might patch the affected areas for holes and cracks, while other types of damage might require other solutions, such as sealing or reinforcement. The table below shows common solutions and average prices for each.


Cost to Patch, Fill, Seal, or Reinforce a Subfloor

Cost to Patch, Fill, Seal, or Reinforce a Subfloor


SolutionAverage Costs (Labor Included)
Patch$150 - $600
Filler$150 - $600
Sealer$250 - $700
Reinforce$300 - $1,000


Patch a Subfloor

The average cost to patch a subfloor ranges from $150 to $600. Patching is a common repair method when it develops holes or gaps. Patching materials and kits can patch these holes to prevent water or dirt from entering and causing extra damage. This can be a very efficient method when dealing with minor superficial damages.

Subfloor Crack Filler

Homeowners pay $150 to $600 to fill cracks in their subfloor. When it develops a crack, a professional contractor usually uses filler material to fill in the crack and sand it down to be in line with the level. This is often a cheaper alternative to replacing the damaged section.

Subfloor Sealing

To seal your subfloor, expect to pay between $250 and $700. Sealing is best done during the installation process, but it can be done afterward by removing the top layers of flooring to access it. It is helpful for protecting your subfloor from moisture damage and reducing the risk of expensive rot and water damage repair.

Reinforce a Subfloor

Subfloor reinforcement averages $300 to $1,000. Reinforcement can be useful when the subfloor structure has been weakened from damaged joists or sagging sections. There are various methods of reinforcement, including sistering damaged joists or the installation of steel jacks to provide extra support underneath it. Additional plywood materials can also be attached around the joists to provide extra strength.

Labor Cost to Repair a Subfloor

Labor costs for subfloor repairs typically range from $25 to $45 per hour. A wide range of factors impact the labor costs, such as the problem, repair method, time spent on the job, and accessibility. Jobs take from a few hours to several days, depending on the problem size and scale. Some contractors charge call-out fees of around $50 to visit your property and assess the damage. Others have minimum fees of $100 to $150 for repair jobs. They may also charge extra for travel fees if you live in a remote location.


Replacing Plywood Subfloor Panels


Subfloor Inspection Cost

A subfloor inspection ranges between $100 and $400, depending on the property size. Since they can be difficult to access and hidden by other layers of flooring, most professionals do not offer specific inspections. Instead, they offer a general flooring inspection to look for signs of damage, such as uneven or sunken areas, strange smells, and squeaking sounds. They provide you with a full report of their findings and more closely investigate problem areas. This can spot problems early and have them fixed before they become more serious.

Repair vs Replace Subfloor

If your subfloor is heavily damaged, you might hesitate between fixing or replacing it. Subfloors do not often need replacing and last for decades without major problems, but it might be better to replace them if they are seriously damaged, very old, or defective. Think about prices and calculate which option offers the best value. If yours is repeatedly causing problems and repair prices are adding up, it might be a better value to replace it. The table below shows the average costs to fix and replace subfloors.


Comparison of the Cost to Repair or Replace a Subfloor

Comparison of the Cost to Repair or Replace a Subfloor


ProjectAverage Cost (Labor Included)
Repair$250 - $850
Replace$600 - $2,400


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Enhancement and Improvement Costs

Cost to Remove a Subfloor

Subfloor removal adds $50 to $150 to your repair fees, so keep this in mind when having large sections of damaged subfloor fixed or replaced. Laborers must spend time to remove and dispose of the damaged section. Some laborers include this in their standard fees, but others charge extra.

Clean a Subfloor

Cleaning subfloors usually ranges between $100 and $500, depending on the flooring size. This can be an important process when installing new top layers of flooring, and it can be a good idea to check and clean the subfloor before adding a new layer to prevent dust and dirt build-up. Homeowners can also save money by cleaning subfloors with vacuum cleaners and homemade cleaning solutions.

Additional Considerations and Costs

  • Permit. Permits are not usually required for subfloor repairs and replacements, but it is still wise to check with your local building authority.
  • DIY. You can carry out some basic maintenance and repairs if you have experience working with floors, but most jobs should be left to the pros.
  • Added value. Subfloors in good condition do not necessarily add value to a property but can be mentioned as an extra incentive for prospective buyers.
  • Lifespan. Subfloors can last as long as a house with regular maintenance and care, but they might only last around 30 years if they are defective or damaged.

FAQs

  • Can you patch a subfloor?

Yes, you can patch damages in subfloors, such as cracks and holes. This is a common repair method.

  • How do you fix a water-damaged subfloor?

The damaged floor material must be removed and support framing installed. Then, new subflooring can be measured and fitted.

  • Can I put a new subfloor over an old subfloor?

Yes, you can install a new subfloor over old subfloors. However, it is wise to consult with a specialist for an expert opinion.

  • How do you fill small gaps in a subfloor?

The floor first must be cleaned and sanded. Some wood filler or wood putty can patch the holes or gaps.

  • How do you seal a subfloor?

A special primer or sealant must be applied to the subfloor to block moisture from penetrating and causing damage.

  • How do I strengthen my subfloor?

You can reinforce a subfloor in several ways. Extra bridging can be added between the joists, new support walls installed, or extra plywood applied under the joists to reinforce the entire flooring structure.

  • How do I know if my subfloor is bad?

There are many signs of a bad subfloor, including sagging or uneven sections, strange smells, squeaking sounds, and movement when the floor is walked over.

Remodeling Terms Cheat Sheet

Definitions in laymen's terms, cost considerations, pictures and things you need to know.
See full cheat sheet.
glossary term picture Subfloor 1 Subfloors: The bottom-most layer of a floor, supported by joists, over which finished flooring material is laid
glossary term picture Plywood 2 Plywood: An engineered construction material manufactured from thin slices of wood glued together in alternating grain patterns for strength

Cost to repair a subfloor varies greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.

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The information provided by our cost guides comes from a great variety of sources, including specialized publications and websites, cost studies, U.S. associations, reports from the U.S. government, contractors and subcontractors, material suppliers, material price services, and other vendor websites. For more information, read our Methodology and sources
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Cost to repair a subfloor varies greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.

The information provided by our cost guides comes from a great variety of sources, including specialized publications and websites, cost studies, U.S. associations, reports from the U.S. government, contractors and subcontractors, material suppliers, material price services, and other vendor websites. For more information, read our Methodology and sources