The New Zealand Historic Places Trust website has some great information for people wanting to rebuild historic buildings affected by the quakes. The trust believes many buildings can be saved, if we are willing to try. They have even provided a list of suggested contractors to assist you with your repairs. For more information go to:
The Historic Places Trust also have other helpful tips as well as some very sad images of damaged historic buildings at:
https://www.historic.org.nz/en/ProtectingOurHeritage/FAQs-Earthquake.aspx
If you are interested in donating to this trust, please go to the above website.