How to set minimum and maximum purchasable quantity for a WooCommerce product without any plugin.

Updated June 7, 2020June 7, 2020 by Pramod Jodhani

One of the best things about WooCommerce which makes it so widely adapted ecommerce platform is it’s customizability.

With this little peice of code we can limit the minumun purchasable quantity for all products in the site

<?php 
/**
 * Show error if quantity is less than 2.
 */
function pram_minimum_item_quantity_validation( $passed, $product_id, $quantity, $variation_id = 0, $variations = false ) {

	$minimum = 2;

	if ( $quantity < $minimum ) {
		wc_add_notice( sprintf( 'Minumum purchasable quantity for this product is "%d"', $minimum ), 'error' );
        return false;
	}
}
add_action( 'woocommerce_add_to_cart_validation', 'pram_minimum_item_quantity_validation', 1, 5 );

If you want to add this restriction for only a certain product then you only need to make a slight modification:

<?php 

/**
 * Show error if quantity is less than 2 and only for a certain product.
 */
function pram_minimum_item_quantity_validation( $passed, $product_id, $quantity, $variation_id = 0, $variations = false ) {

	$minimum = 2;

	if ( 52 === $product_id && $quantity < $minimum ) {
		wc_add_notice( sprintf( 'Minumum purchasable quantity for this product is "%d"', $minimum ), 'error' );
        return false;
	}

	return $passed;
}
add_action( 'woocommerce_add_to_cart_validation', 'pram_minimum_item_quantity_validation', 1, 5 );

Set maximum purchasable quantity

<?php 
/**
 * Show error if quantity is more than 2.
 */
function pram_minimum_item_quantity_validation( $passed, $product_id, $quantity, $variation_id = 0, $variations = false ) {

	$maximum = 2;

	if ( $quantity > $maximum ) {
		wc_add_notice( sprintf( 'Maximum purchasable quantity for this product is "%d"', $maximum ), 'error' );
		return false;
	}

	return $passed;
}
add_action( 'woocommerce_add_to_cart_validation', 'pram_minimum_item_quantity_validation', 1, 5 );

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