Utvidelse av enkeltfliser

I purchased a load of tiles back in early 2021 but had no idea what I was doing and haven’t really been back since. I’ve recently started using it again but I’ve got a few single tiles scattered about but they are not much use as I can get cydroids etc on them. Is there a way I can buy the tiles around these single tiles to make one larger one? i.e buy the three around a single one to make a 4 tile property?