Is a log cabin the same thing?

No, and it is worth understanding the difference before you compare quotes. A games room log cabin is built from solid timber walls, which look lovely but insulate poorly and move with the seasons, so gaps open up and heat escapes. Our buildings are properly insulated garden rooms with a sealed, framed construction, which is what makes them usable all year round rather than pleasant in June and freezing in January. A garden log cabin is generally cheaper up front. It is rarely cheaper to run.