Whilst many of the products we sell are available to purchase in square metres, our luxury vinyl tiles are purchased by the box. When estimating the appropriate amount of coverage for your installation approximately 5% (rounded up to the nearest box) should be added to your order to allow for colour matching between boxes and wastage during fitting. If you have a spare box left over, we would suggest these be stored on a flat dry surface for future use as these are often useful to be kept should an accident occur enabling you to swap any damaged tiles for new ones. We refresh our ranges on a frequent basis, therefore we can't promise your specific design or colour will be available in the future should a box be needed so we'd always recommend you keep any boxes that might be left over for these reasons. If you would like to return your extra box, we can offer a refund for an unopened and undamaged box of 50% of the original order value. This is because we can't return the excess packs to the manufacturers as they won't accept them, and, as these are ordered in specific batches (just like paint is purchased with specific batch numbers). it's important for each customer’s order to be from the same batch. We also don't have sufficient storage space in our stores.To arrange your refund, simply contact the store where you placed your order. Alternatively, you can contact Customer Support via the ‘Submit a Request’ button and if you supply your order details, they will put you in touch with the right person who can provide further assistance.