Check heritage impact assessment criteria.

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Does your development meet any of the following criteria set out in Section 38 of the National Heritage Resources Act?

If yes section 38 of the Act states you "must at the very earliest stages of initiating such a development, notify the responsible heritage resources authority and furnish it with details regarding the location, nature and extent of the proposed development".

The heritage resources authority will then advise whether an impact assessment report is required.

Contact details can be found here

If yes contact a professional for advice