Hi sifus, need your help here.

I am considering either custom made cabinets that were recommended from my contractor or IKEA kitchen cabinets. I bought a subsale house and the previous owner has installed some cabinets in the wet kitchen area. Correct me if i am wrong, Ikea kitchen cabinets are not customisable and I am afraid that the Ikea cabinets will not fit the current kitchen once my contractor has dismantled the current table top and old cabinets.

Sorry but what is a modular cabinet? If I buy the Ikea cabinets and if it doesn't fit, can they refund? What can I do to prevent this from happening?