Decide which space in your house will be used to build the sound booth. The basement is a common choice. However, it can be significantly more difficult to build a sound booth in a basement because it will require you to build new walls. If you have an extra closet that is large enough to be made into a sound booth, then it will be much easier to transform the closet.
Clean out your room of choice, removing any unnecessary objects.
Cover the walls in foam panels or sound absorption sheets. If the room does not already have carpeting inside it, then add a carpet or some rugs to the floor. This will act as soundproof material that deflects echo. For more soundproofing, add two layers of sound absorbing materials.
Install a ceiling fan or a wall fan inside the recording sound booth. A fan will create white noise and help to deaden all other sounds.
To prevent sound interference, place all other equipment, such as musical instruments, away from the booth. Any cords needed for recording vocals inside the booth should be run through the door.