Generally, ground-level Patio installation in Cavan does not require planning permission as it often falls under 'exempted development'. However, there are important caveats, particularly concerning size, height, and proximity to boundaries. If your proposed patio significantly raises the ground level, includes substantial retaining walls over a certain height (e.g., 1.2 metres adjacent to a road), or could impact your neighbours' privacy or light, you might need to consult with Cavan County Council.
Considering Cavan's climate, ensuring proper drainage and using appropriate weather-resistant materials are critical design considerations, even if planning permission isn't needed. Always confirm specific local regulations for your property. To discuss compliance and design with local Patio installation specialists, get quotes from vetted professionals on Onlinetradesmen.ie.