One adapts a plan the city has already reviewed. The other draws the house around the people who will live in it. The right answer depends on the parcel and on whether your jurisdiction runs a programme at all.
from $4,500
Express Plan
A jurisdiction's pre-approved ADU plan adapted into a permit set for your property.
Choose it when
Your city runs a pre-approved ADU plan programme and it is open
One of the published layouts genuinely suits the household
The lot can take the plan without reshaping it
Plan-check time and fees matter more than a bespoke layout
Know before you commit
Not every city has one, and programmes close during code updates
Some cities allow no alteration at all to the drawings — San Marcos says so plainly, and a plan you cannot adjust is a plan the lot must suit
Site, utility, grading and agency work is still required: the free plan is the building, not the project
A permit set drawn to the adopted standards of your jurisdiction
Responses to the first two rounds of agency corrections
Coordination of the consultants the project requires
Consultants, permit processing, corrections beyond the second round, interiors and contractor estimates are quoted separately. Every figure, and what sits behind it, is on the pricing page; what affects the total is explained separately.