Custom Homes

How to Calculate the Square Footage of a Home

It’s time to paint. Does this strike dread in your heart? How much paint should you buy? What happens if you skimp on supplies? Do you really need that extra gallon just to cover the corners? Listen, determining square footage isn’t always in the average homeowner’s repertoire. However, we think it should be. From home additions to kitchen remodels to new home construction, we are Brevard County’s trusted source. We’ve got you covered from start to finish. Of course, if you don’t want to fiddle with numbers, TJ Builders is more than happy to assist you. No job is too small or too big for us. However, we love to keep our clients informed so today we are going to tackle math. Don’t worry, we won’t be quizzing you at the end! We just want you to know the basics so you can do your small project with ease.


Did you know that simply painting the interior of your home can add value? According to Open Door, painting the inside of your home can result in an over 100% return on your investment. Will you have to buy the paint, yes. However, a great paint job can add bring about a great return, so why not go for it? Even if selling isn’t in your future, a fresh paint job will redefine your home and bring added joy. You win either way!


Now that you’ve decided to tackle painting, let’s look at the measurements you need to be successful. Too much paint means you spend more than necessary and too little means that you get to make multiple trips to the paint store. Your time and money are valuable, so let’s get it right the first time. One thing to note is that one gallon of paint will cover approximately 400 sq ft of space.


How to Calculate the Square Footage of a Home


Step 1

Measure the length of each wall.


Step 2

Add the measurements of each wall together. This will give you the total perimeter of the room.


Step 3

Measure the height of the room. If you have walls that are different heights, make sure to take the height of the tallest wall to ensure the total will account for the variation in height.


Step 4

Multiply the perimeter (the length of each wall added together) by the height. This will give you the total square footage for the room.


Step 5

Subtract 15 square feet for any window in the room and 20 square feet for any door opening in the room from the total square footage value you obtained from step three. This value will give you the total surface area in need of paint.


Step 6

Divide the total square footage by 400 (the approximate coverage provided by 1 gallon of paint) to determine how many gallons you need to purchase. Keep in mind you will probably want to do 2 coats of paint and have some leftover for touch-ups.


And that’s it! Pretty simple. Painting doesn’t have to be overly complicated once you know how much paint you actually need. Of course, you will also have to put in sweat equity if you are doing the job yourself, but we have faith in you!

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TJ Builders

We are a full service construction company! We have over 30 years of serving Brevard and surrounding counties. We are a BBB accredited company with an A+ rating. We take great pride in all our jobs and really go the extra mile to make all our clients happy. We would love the opportunity to bid your next construction project.

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