Sullivan's Kiln has historic significance at the State level as a substantially intact small cylindrical lime kiln directly associated with the limeburning industry in Victoria during its formative stage and pre-dating the development of substantial undertakings during the latter part of the nineteenth century. It has technical signficiance in that it demostrates the method used in lime burning during the mid to late nineteenth century and facilitates contemporary interpretation of the building industry, especially during the founding years of settlement in Port Phillip Bay. Its remote location offers an insight into the lives of the small communities which worked the Mornington Peninsula kilns, often at locations far removed from the settled areas.
The site has regional significance as one of the most intact kilns to survive on the Mornington Peninsula, comparing in this respect with the costal kiln on Merrylands Avenue, and for its association with the Sullivan family which was well known for its role in the local lime burning industry. Its regional significance is derived also from the kiln's functional link in the lime producing process which formed an essential part of the local building industry, expressed in its early surviving limestone buildings.