Please contact us as soon as you realize changes are necessary in your order, and we will try to accommodate your request. You can reach us via email at contact@support.edwardmartin.com. However, please note that once an order has been shipped, we are unable to make any changes. If your order has already been prepared for dispatch or is on its way to you, any cancellations or changes will be subject to a 25% restocking fee. Additionally, you will bear the cost of returning the tiles. If you wish to add extra items after your order has shipped, these will be treated as a separate new order and dispatched independently.