So long as you take the correct approach, with an experienced architect, it is possible to get permission to make reasonably sized additions to your house, or to replace it with something suitably larger on Green Belt land.
An experienced & knowledgeable architect can help by understanding how to navigate both national & local policy to leverage advantage, designing a scheme to fit harmoniously into the Greenbelt and minimise its impact on the openness of the area. They can also explore optimal approaches together with specialist Planning Consultants to explore ‘very special circumstances’ or other potential avenues for approval.