The project, by CTM Architects - for a relatively small residential project on the coast in the town of Sandgate - had attracted major local opposition.
The opposition groups claimed it would damage the setting of the historic town and the neighbouring 16th-century Sandgate Castle.
But the planning inspector supported the project, which had the backing of English Heritage, insisting that the designs were of a high standard and respected the sensitive context.
When the project is complete it will include two residential buildings, one which will face the seafront and one which will respond to the town's streetscape.
Guy Holloway, senior partner at CTM Architects, said the inspector's decision was important not just for the project but for the rest of Kent and the country. 'The project represents a landmark planning decision for the region and for the UK as a whole.
'The design stands testament to the possibility for high-quality, well-considered, visionary architecture to win plaudits in even the most sensitive and historic of locales and we are delighted to have won the planning permission.
'This is an exceptional project and one of which we at CTM Architects are extremely proud,' Holloway added.