We live in a slightly too small house with a large garden. We need a bit more space as the DC get bigger, and adding a garden building would mean we can free up a room to be a playroom/teen pit, and maybe not have to move.
The garden is irritatingly huge and awkwardly arranged. Losing a bit of the jungle would be no hardship! But I don't want it to be an expensive library that we rarely go into, so it needs to be really cosy and comfortable, well insulated, good lighting...and all on a fairly tight budget.
If you've done this, was it worth it? And do you think it adds any value to the house if one does sell eventually?