Downstairs redesign

Based on the information provided, it sounds like the changes you want to make to your property will likely require planning permission. Converting a door into a new front door and altering the size of the bathroom may both require planning permission, depending on the specifics of your property and the local regulations. Additionally, relocating the gas meter may require permission from your gas supplier as well as local authorities. As for your question about whether the new front door idea is flawed, it's difficult to say without more information about the layout and structure of your property. It may be helpful to consult with an architect or other building professional to determine the feasibility and potential impact of the changes you're proposing. If you're planning on developing the downstairs area further and potentially extending over the garage and living room in the future, it's important to ensure that the foundation is adequate for these changes. This may also require planning permission and consultation with building professionals to ensure that the changes are safe and feasible.

Regarding the new front door idea, it's best to consult with an architect to determine if it's feasible and complies with building regulations. For the other work, planning permission may be required depending on the extent of the changes. It's recommended to consult with an architect or local planning authority for guidance. As for the foundation work and extension, it's best to plan ahead and consider the structural implications of the changes. An architect or structural engineer can advise on the necessary steps to ensure the safety and stability of the building.