How to Fill a Gap Between a Baseboard and Carpet

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fill a gap between baseboard

If you have a gap between your carpet and your baseboard, it is very important that you repair it. 

Not only is it an aesthetic issue, it can also make your home less efficient. 

When the baseboards are installed, they should have some room for the carpet. However, sometimes, this gap will be too big. 

Luckily, there are some ways you can close this gap without completely starting over. 

In this article, we have laid out some different methods for getting rid of this gap.

Some of them will be more effective for different size gaps. By knowing all the different methods, you can pick the best one for your home. 

Key Takeaways

Filling the gap between your baseboard and carpet helps to finish the look of your flooring and can stop heat from escaping. To fill these gaps, try the following:

  • Caulking it with silicone that matches your baseboard.
  • Removing your old baseboards and replacing them with new ones.
  • Pad your carpet up to meet the baseboards.
  • Add a matching trim to your baseboards.

Filling a Gap Between a Baseboard and Carpet: Basic Idea 

There are a few different techniques for closing the gap between your carpet and baseboard. They include: 

  • Use caulking 
  • Put in new baseboards
  • Add padding
  • Install new trim

Why Fill a Gap Between a Baseboard and Carpet?

why fill a gap between baseboard and carpet

One of the main reasons people want to fill the gap between a baseboard and carpet is aesthetic. 

The gap can make your home look unfinished and will often be very noticeable. Sealing it up can give your home a complete look and help the carpet blend well with the trim. 

The most important reason to seal this gap, though, is efficiency

This gap is a space where heating and cooling can escape. Without sealing the gap, your HVAC will have to work harder to keep your home warm or cool. 

Until you seal the gap, you will be losing money every month on your utility bill.

Caulk the Gap

If the gap is relatively small, you can seal it up with silicone caulk. 

This method should only be used if the gap is smaller than ½”. If it is bigger than this, the caulk will not be able to cover it. 

Silicone caulk comes in all kinds of colors and shades. You should be able to find a color that matches the paint on your baseboard. 

Tape off your carpeting or pull it back as far as you can from the wall. Then, run the silicone caulk along the gap, sealing it up. 

Pro Tip: When choosing the caulking method, ensure you choose a silicone caulk that matches your baseboard color. It’s easy to overlook this detail, but mismatched caulking can stick out like a sore thumb and make your finish look unprofessional.

Wipe away excess caulk as you work. Once you have sealed up the gap, let it dry for 24 hours before moving the carpet back. 

Install New Baseboards

One of the reasons you might have this gap is that the baseboards are the wrong size. 

If you need to install new baseboards, you can get them cut to the right size for your carpet

Generally, it is best to install the baseboards after the carpet. However, many contractors will switch the order around and this is how you end up with the gap. 

If you don’t want entirely new baseboards, you can simply lower the ones you have. 

Pry the baseboards up gently and reinstall them low enough to close the gap. You will have to nail new holes, but the old holes can be filled or painted over. 

Add Padding to the Carpet 

You can also add padding underneath the carpet along the perimeter of the wall. 

This will lift the carpet up enough to close the gap. Padding can also be a great insulator that can make your home more efficient. 

Pro Tip: If you’re considering replacing old baseboards, I would urge you to check whether your carpet’s padding isn’t the real issue first. It can save you costly changes. If the padding is worn out or not of the right thickness, it impacts the carpet’s height, causing the gap.

This method should only be done if the gap is small. 

You only want to add enough padding to close the gap. You don’t want there to be a visible bump in the carpet. 

Add Trim To the Baseboards 

You can also add some trim pieces to the bottom of your baseboards. 

One of the benefits of this method is that you can add a whole new style element. There are a number of different trim types available and you can give the room a new look. 

It’s important that you match the trim to the color of the boards.

Pro Tip: Adding a trim to the baseboards can not only cover the gap, but also add an extra stylish detail to your room. But remember, less is more. Choose a trim that complements the existing décor and doesn’t overpower it. You’ll be surprised at how a simple trim can lift the entire appearance of your room.

This will give the new trim a seamless look and will keep the room cohesive. Any time you add a new element to a room, it should work with the rest of the decor. 

Video Tutorial

Frequently Asked Questions

  • Do baseboards need to be removed to install carpet?

Baseboards should always be removed when installing carpet. 

By doing this, you will know where the baseboards need to be attached. This will help you close the gap between the wall and carpeting. 

  • Is it better to paint before installing carpet?

If you have the ability, you should always paint before installing carpet or after removing it

If you already have your carpet installed, you will have to put down a drop cloth. You will also be much more likely to accidentally stain the carpeting

  • Where should you nail the baseboard?

You should nail the baseboard as close to the carpeting as possible. 

It’s a good idea to leave less than an ⅛” of room, though. This will allow the carpet to shift as you walk on it and will prevent lifting. 


If you are dealing with a gap between your carpet and baseboard, you should fix it as soon as possible. Doing so will help you keep your home efficient and looking finished. 

By trying the above methods, you can close the gap and give your home the complete look it deserves. 

Photo of author


Michael J. O’Connor is a writer and marketing specialist from the Bay Area of California. A graduate of Sonoma State’s Creative Writing program, he spent many years as a contractor and carpet layer, learning the ins and outs of flooring and general contracting. When he’s not typing away at his desk, he enjoys hiking with his dogs, woodworking and collecting rare books. See full biography here.

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