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Garage conversion #2

Hi everyone, I’m exploring the idea of converting my detached double garage into a granny flat and would love to hear from anyone who has done something similar. My garage is 6.5m x 6m, and I’m planning to add a toilet, shower, and a small kitchen to make it a liveable space. Has anyone here undertaken a garage conversion like this? If so, I’d really appreciate your insights on: 1. **Cost**: Roughly how much did it cost to convert your garage into a liveable space, including plumbing, electrical work, and insulation? 2. **Planning Permission**: Did you need planning permission or building regulations approval? How was the process? 3. **Challenges**: Were there any unexpected challenges or things you wish you’d known ? I’m trying to get a ballpark figure for the cost and understand what’s involved in making this project a reality. Any advice or tips would be hugely appreciated! Thanks in advance!