Add a surcharge if certain products are in the cart, ideal for setup fees etc

gistfile1.php

	/**
	 * Add a fixed surcharge to your cart / checkout based on products in cart
	 * Taxes, shipping costs and order subtotal are all included in the surcharge amount
	 *
	 * Change $fixed to set the surcharge to a value to suit
	 *
	 * Change in_array to !in_array to EXCLUDE the $countries array from surcharges
	 *
	 * Uses the WooCommerce fees API
  	 * Add to theme functions.php
	 */
	add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
	function woocommerce_custom_surcharge() {
		global $woocommerce;

		if ( is_admin() && ! defined( 'DOING_AJAX' ) )
			return;

		// Setup an array or products that have a surcharge applied
		// eg $setupfee_array = array( '7246' );
		// or $setupfee_array = array( '7246','7500','4567' );
		$setupfee_array = array( '7246' );

		// The fee
		$fixed = 5.00;

		// loop through the cart looking for the free shpping products
		foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {

			if( in_array( $values['product_id'], $setupfee_array ) ) {
				$surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total ) + $fixed;
				$woocommerce->cart->add_fee( 'Surcharge', $surcharge, true, '' );
			}

		}

	}

Corrected to remove 'standard' from add_fee based on woocommerce/woocommerce#6808