In the garden is a small outbuilding which can be used as workshop or hobby room.
From the thisisbristol.co.uk
An outbuilding off the main house has become a yoga studio with a massage room.
From the forbes.com
Thus, the Maritime Powers were outbuilding the French at a rate of four to one.
From the en.wikipedia.org
That estimate doesn't include the actual decontamination of a home or outbuilding.
From the abcnews.go.com
A man got out of the car and ran into the open side of an outbuilding on the farm.
From the delawareonline.com
At least one was in a large metal outbuilding, stealing some tools, Heimerman said.
From the kansas.com
Then we converted an outbuilding into a music room, which is now home to our piano.
From the thetelegraphandargus.co.uk
They did such a good job that we had them wire our new two-story outbuilding.
From the newsobserver.com
On a recent day, two fresh deer carcasses hung from an outbuilding on Miller's land.
From the timesunion.com
More examples
A building that is subordinate to and separate from a main building
(Outbuildings) An estate comprises the houses and outbuildings and supporting farmland and woods that surround the gardens and grounds of a very large property, such as a country house or mansion. ...
(OUTBUILDINGS) Any building other than the main structure on a particular allotment of land e.g. a garage, workshop etc.
(Outbuildings) Annex buildings adjacent to the main one
The accumulation of sediments horizontally (on a plane), such as a delta.
A structure that is not a part of the main building but is necessary to the full enjoyment of the property (i.e. a shed, garage, etc.).
An ancillary building, secondary to the principal building but remaining under the ownership of the principal building, generally located towards the rear of the lot. ...