Attached ADUs in Stockton, framed onto the house you
already have.

An attached ADU isn't a guest room and it isn't a back-house. It shares a single wall with your existing home and ties into the same roof and foundation, but it lives as its own apartment — separate entrance, full kitchen, full bath, its own everything behind that one rated wall. Inside, nobody crosses your living room to reach it. That shared wall is the heart of the job. It carries a one-hour fire- and sound-rated separation assembly, so a tenant's late shift or a teenager's amp doesn't bleed into your bedroom. On a lot of Stockton lots we hang these off a ranch home where the side yard is too tight for a detached build but the wall is right there.

Attached units win on cost for one plain reason — they piggyback on what's already running. Your water line, sewer lateral, and gas stub sit feet from the new wall instead of a long trench across the yard, so you skip a chunk of the sitework that makes detached builds pricey. One caveat I flag early: cross 750 square feet on an attached unit and the City of Stockton can require a separate water meter, its own permit and its own fee. So we'll often land a design at 612 or 720 sq ft on purpose, under that line, sharing your existing meter. A Stockton attached ADU usually runs lower per foot than a detached cottage on the same lot, because the expensive infrastructure is already in the ground.