UK
Vendor
Vendor is the usual British word for the person selling a property. US brokerages say seller. In lettings, the client who is renting the property out is the landlord, not the vendor.
Also called Seller.
Who you are reporting to
Sales updates go to the vendor: viewings, feedback, offers, and where the sale sits with the solicitors. The vendor may be one person, a couple, an executor or a company. Send the update to the people named on the agency agreement, not to everyone who viewed.
US wording
If you are writing for a US listing, say seller. Mixing vendor into a US email reads as imported British copy. The job is the same: a factual update the client can forward to their own adviser.
Questions
What does Vendor mean?
Vendor is the usual British word for the person selling a property. US brokerages say seller. In lettings, the client who is renting the property out is the landlord, not the vendor.
General information for agency staff, not legal advice. Rules and local practice change. Check the official source before you rely on a definition in a client letter.