Chains are a sequence of linked house purchases, each of which is dependent on the preceding and succeeding purchase.
Each member of the chain is a house sale, which depends both upon the buyer receiving the money from selling their house and on the seller successfully buying their next property.
A chain begins when a home owner wants to buy another property before selling their own.
Buying and selling your home can be the largest, most important and certainly the most stressful financial transaction you are likely to make.