What Is the Average Cost to Replace a Subfloor in 2025

29 Jul What Is the Average Cost to Replace a Subfloor in 2025

You will probably pay about $1,560 as the cost to replace subfloor in 2025. Most jobs range between $420 and $10,000. According to Angi, the price is usually $3 to $10 per square foot. The cost to replace subfloor can vary depending on the size of your room. Your location also impacts the overall cost. Additionally, the type of material you choose plays a role. Angi and Homewyse use real customer data and expert research, so you can trust these numbers when planning your project.

Key Takeaways

• Replacing a subfloor in 2025 costs $1,500 to $5,000. The price depends on room size, where you live, and what materials you use. Material choice is important. Plywood is strong and keeps out water. MGO board lasts a long time and stops mold. OSB costs less but does not last in wet places. Labor costs change by where you live and how hard the job is. Get several quotes from workers. Ask if underlayment and disposal are in the price. This helps you avoid surprise costs. Watch for sagging floors, squeaks, or mold. These signs show damage early. Small problems can be fixed. Big damage means you need a full replacement. Plan ahead and save 10–15% more money for surprise costs. Fix leaks and use moisture barriers to stop future subfloor problems.

Subfloor Replacement Cost

National Average

The average cost to replace subfloor in 2025 is between $1,500 and $5,000 for most homes. This price range fits many places in the country. Where you live can make the price go up or down. Big cities like Los Angeles usually cost more because workers charge higher rates and permits cost extra. In Los Angeles, a project costs about $2,700. Smaller cities nearby might only cost around $1,275. The table below shows how prices change in different places:

Tip: Check prices in your area before you start. Prices can change fast, especially in busy cities.

Cost Per Square Foot

Most people pay $2 to $6 per square foot to replace subfloor in 2025. Some jobs can cost up to $10 per square foot if you need special repairs or materials. This price covers labor, materials, and sometimes getting rid of old stuff. Here are some common things that affect the price:

You might pay more if you need to take out old floors, fix water damage, or remove mold. Labor costs have gone up lately, so the total price is higher.

Factors Affecting Cost

Many things can change how much it costs to replace subfloor. The size of the space is the biggest reason. If your room is small, like under 200 square feet, you might pay more for each square foot because workers have a minimum fee. Bigger jobs, like over 500 square feet, sometimes get a lower price per square foot. Here are some examples of project sizes:

Think about the material you pick, if you need a moisture barrier, and if you have to fix joists or other problems. If your house has asbestos or mold, you will pay more to remove it safely. Where you live also matters. For example, Boston can cost 10–20% more than the national average, but rural areas might be cheaper.

• Prices for materials can go up or down depending on supply and demand.

• Eco-friendly or high-tech materials usually cost more at first.

• Save 10–15% of your budget for surprises.

Note: Subfloor replacement costs have gone up since 2022 because materials and labor are more expensive. Planning ahead can help you avoid extra costs.

Cost to Replace Subfloor by Material

When you look at the cost to replace subfloor, the type of material you choose makes a big difference. Each material has its own price, benefits, and best uses. Here’s how the most common types of subfloor materials compare in 2025:

Plywood Subfloor

You will often find plywood subfloors in kitchens, bathrooms, and living rooms. Plywood costs about $2.50 to $3.00 per square foot to install. For a 300-square-foot room, you might pay between $600 and $700 for materials and labor. Plywood is strong and resists moisture better than OSB. Builders use tongue-and-groove panels that fit together tightly. This helps your floor stay level and quiet. Plywood works well in places where you want a sturdy, long-lasting floor.

Note: Plywood can swell if it gets very wet, so it is best for areas with low to moderate moisture.

MGO Board Subfloor

MGO board, or magnesium oxide board, is a newer choice for subfloors. It costs about $1.50 to $3.00 per square foot. You pay more at first, but MGO board lasts a long time and needs fewer repairs. It stands up well to water, mold, and fire. Many people use MGO board in basements, bathrooms, or anywhere moisture is a problem. MGO board is also eco-friendly and does not release harmful chemicals. This makes it a safe pick for healthy homes.

• MGO board can lower your long-term costs because you will not need to replace it as often.

• Its fire resistance can help keep your home safer.

OSB Subfloor

OSB is the most budget-friendly option. You pay about $0.50 to $1.00 per square foot for materials. OSB works well in bedrooms, hallways, and other dry areas. It is strong but does not handle water as well as plywood or MGO board. If OSB gets wet, it can swell or break down. You might save money at first, but you could pay more later if you need repairs.

Tip: If you want a subfloor that lasts and keeps your home healthy, MGO board is a smart choice. For a lower upfront cost, OSB is best for dry rooms.

The cost to replace subfloor depends on the material you pick and where you use it. Always think about moisture, safety, and how long you want your floor to last.

Labor and Extra Expenses

Labor Rates

You will find that labor rates for subfloor replacement in 2025 can vary a lot depending on where you live. In many cities, you pay between $4 and $10 per square foot for labor. Some areas, like Palo Alto, charge even more—up to 30% higher than the Bay Area average. If you hire workers by the hour, expect to pay $40 to $65 per hour in places like Sunnyvale or Fremont. The table below shows how labor rates change by location:

Project complexity also affects labor costs. If your room has lots of corners, built-in furniture, or appliances, workers need more time. Simple jobs may take only four hours, but complex projects, like finished basements, can take up to 24 hours. If you need structural repairs or moisture barriers, you will pay more for skilled labor.

Tip: Summer projects often cost 10–15% more because demand is higher.

Joist and Structural Repairs

Sometimes, you need to fix or replace joists under your subfloor. This adds to your total cost. Replacing a single joist costs $350 to $1,000. If you need to replace all the joists in a room, you might pay $5,000 to $10,000 or more. Reinforcing joists, called “sistering,” costs $150 to $325 per joist. Small patch repairs usually cost $100 to $300. For bigger repairs, you may pay $65 to $92 per square foot.

Underlayment and Disposal

You also need to budget for underlayment and disposal. Underlayment helps your new floor last longer and feel more comfortable. The cost for underlayment, fasteners, adhesives, and sealants is usually included in the total job supplies. When you remove old flooring, you must pay for loading, hauling, and legal disposal. These costs are part of the overall project price, which ranges from $10.90 to $19.75 per square foot for bathroom flooring jobs. This price covers labor, materials, equipment, and disposal, but not hazardous material removal or permits.

Note: Always ask your contractor if underlayment and disposal are included in your quote. This helps you avoid surprise fees later.

Repair or Replace a Subfloor

Signs of Damage

You might wonder how to spot subfloor problems before they get worse. Early detection can save you money and keep your home safe. Watch for these common signs:

• Uneven or sagging floors, which often point to water damage or weak support.

• Soft, bouncy, or spongy spots when you walk across the floor.

• Loud squeaking or creaking sounds from loose floorboards or shifting subfloor panels.

• Musty or moldy smells, which can signal hidden moisture or mold growth.

• Cracked, warped, or popping tiles and floorboards, especially in kitchens and bathrooms.

• Bubbling or stained linoleum and vinyl, which may mean water is trapped underneath.

• Rocking toilets or fixtures that feel unstable.

• Visible signs of pests, like sawdust or hollow-sounding wood.

Tip: Moisture is a leading cause of subfloor damage. If you notice musty odors or see mold, act quickly to prevent bigger problems.

When to Repair vs. Replace

You may ask yourself if you should repair or replace a subfloor. The answer depends on the extent and type of damage.

1. Repair

   • Choose repair when the damage is small and limited to one area.

   • If the subfloor is still strong and only has minor issues, patching or reinforcing can fix the problem.

   • Repair works well for small cracks, slight unevenness, or minor squeaks.

   • This option saves money and reduces waste.

2. Replace

   • Full replacement is needed if more than 30% of the subfloor is damaged.

   • Replace the subfloor if you see widespread water damage, mold, rot, or termite problems.

   • If the floor sags, bounces, or feels unsafe, replacement is the best choice.

   • Upgrading old or outdated materials also calls for replacement.

   • Always get a professional inspection if you are unsure.

Note: Ignoring serious subfloor issues can lead to bigger repairs, safety risks, and lower home value. When in doubt, consult a flooring expert to help you decide the best way to repair or replace a subfloor.

You can expect to pay $1,800 to $3,000 per room for subfloor replacement in 2025. The final price depends on room size, damage, material, and labor. Check the table below for a quick overview:

Material choice and labor rates change your total cost. Plywood, OSB, and moisture-resistant boards each have different prices and uses.

Tip: Always get several quotes. Look for signs of damage early. Decide if repair or full replacement fits your needs best.

FAQ

How long does it take to replace a subfloor?

You can expect most subfloor replacement projects to take one to three days. The time depends on the room size, the amount of damage, and the material you choose. Complex repairs or large rooms may take longer.

Can you replace a subfloor yourself?

You can try to replace a subfloor if you have carpentry skills and the right tools. Most people hire a pro because mistakes can cause safety issues. Always check for hidden problems like mold or damaged joists before you start.

What is the best subfloor material for bathrooms?

MGO board works best in bathrooms. It resists water, mold, and fire. Plywood also works if you use a moisture barrier. OSB is not a good choice for wet areas because it swells and breaks down when wet.

Will insurance cover subfloor replacement?

Insurance may cover subfloor replacement if sudden events like burst pipes cause the damage. Normal wear, rot, or neglect usually are not covered. Always check your policy and talk to your agent before you start repairs.

How can you prevent subfloor damage in the future?

You can prevent damage by fixing leaks fast, using moisture barriers, and keeping rooms dry. Regularly check for signs of water or pests. Good ventilation and quick repairs help your subfloor last longer.