A change of premises, whether residential or business related, is always a major upheaval and highly stressful for all concerned, and a gift of flowers not only wishes the recipient happiness in their new abode, it also brightens up the space and adds a pleasant natural perfume to give a homey feel.
You may want to compliment the elegance and good taste of the new appointments, in which case chrysanthemums and dahlias are the flowers to bring along to the housewarming party.
Alternatively, bring along anthuriums to thank the host for their hospitality and wish them success with future guests. Add a splash of cheerfulness with gerberas, yellow carnations, jasmine or, again, with chrysanthemums. Nothing brings sunshine and warmth into the room like a few sunflowers.
A new home or office is a new beginning, which can be celebrated with a bunch of narcissi. Promote a sense of well-being and harmony in the space with delphiniums. If the new homeowner or office head honcho is a superstitious sort, give them peace of mind by sending violets and lilies of the valley as a charm against evil and protection from evil spirits.