Shop upgrade EditOnce story progress, you can upgrade workshop or furniture in shop. There're 3 categories: Workshop, Enhancement and Decoration.
More upgrade will be unlock after moving shop to new planet.
All workshop can be upgrade to increase capacity.
Enhancement are coffee machines, environment and pet supplies. Coffee machines can help increasing smiths mood or energy. Environment help decreasing weather effect such as hot or cold. Pet supplies is the place where potato dog can rest.
Decoration can buff up smith status or forging exp gain. Some decoration can be unlock from completed legendary heroes request.