http://sridharkatakam.com/how-to-set-equal-height-for-content-modules-element-and-sidebar-in-ithemes-builder/

equal-heights.js

jQuery(document).ready(function() {

	var highestCol = Math.max(jQuery('.builder-module-content .builder-module-element').height(),jQuery('.builder-module-content .builder-module-sidebar').height());

	jQuery('.builder-module-content .builder-module-element, .builder-module-content .builder-module-sidebar').height(highestCol);
});

gistfile1.php

// Enqueuing and Using Custom Javascript/Jquery for same equal height to Content module's element and sidebar

function equalheights_code() {
	wp_enqueue_script( 'equalheights_script', get_stylesheet_directory_uri() . '/js/equal-heights.js', array('jquery'), false, true );
}
add_action( 'wp_enqueue_scripts', 'equalheights_code' );

gistfile2.css

.builder-module-content .builder-module-element {
	padding-top: 0;
	padding-bottom: 0;
}

.builder-module-content .builder-module-element .loop {
	padding-top: 1.5em;
	padding-bottom: 1.5em;
}

.builder-module-content .builder-module-sidebar {
	background: #565C38;
}

.builder-module-content .builder-module-sidebar-outer-wrapper {
	max-width: 314px !important;  /* this value depends on sidebar width, for 1 right sidebar layouts */
    width: 314px !important; /* this value depends on sidebar width, for 1 right sidebar layouts */
}