Party Thrower

• It used to be that only friends of the homeowners were meant to send housewarming invitations as well as throw the party, but this is no longer the case. Now it is acceptable for homeowners and their immediate relatives to throw the party. The person who is hosting the party should be listed on the invitation, as well as who the RSVP should go to, by what means and the RSVP deadline.
  
  

Guests

• Guests can include the new owner's friends, family, colleagues and more. If it will be an adult's-only party, specify that on the invitation. You can do it in a polite way, such as "Adults only, please," or in a funny manner, "We just painted--we can't have crayon on the wall yet." If you have kids yourself, or anticipate it being a difficulty for any of your guests, you can hire a babysitter or two to watch children in a playroom or family room during the party. Mention this on the invitation if it is an option.
  
  

Theme

• The tone of the party should be set by the aesthetics of the invitation. A casual brunch could have an informal invite, while cocktails followed by dinner should obviously have a more formal invitation. The time of the party also reflects the theme. Evening events are typically more formal. However, if you expect guests to be dressed up, it is best to include a dress code on the invitation so as to avoid embarrassment on anyone's part. Guests will also expect some sort of food and drink, so list on the invitation what you will be serving, such as "Drinks and hors d'oeuvres will be served" or "Come for a taco bar."
  
  

Location

• This seems like common knowledge, but the party should be held at the new house. If it's being remodeled, the party should occur after it is habitable again. Be sure to include directions on the invitation, as this is the first time most invitees will be coming to the house.
  
  

Registry

• It is not good etiquette for a housewarming invitation to list a registry if it's coming from you, the homeowner. You can go ahead and register, and if invitees ask you, you can tell them. If you do not wish to receive gifts, you can add at the bottom "No gifts please." If a friend is throwing the party and sending invitations, they can give the registry information.