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Building a detached ADU isn’t necessarily different than building a house.
Although ADUs (usually <800 sq ft) are necessarily smaller than a normal house (avg house size is 2,382 sq ft), the same stages of building development still apply. And often, the same planning and design process will apply as well.
The differences in the building process lie in the following: a) complying with municipal ADU regulations b) designing a smaller, more space-efficient design and c) building on a site that may have additional site constraints.
Here’s a multimedia slide show that depicts the programmatic and design thinking that went into this same ADU.