Step 8: Budget reality: what drives cost in an ADU or addition?
ADU and addition costs are driven by:
- how much new structure is required (conversion vs new build)
- plumbing complexity (bathrooms and kitchens add cost)
- finish level (durable basics vs custom/high-end)
- site conditions (access, slopes, utility runs)
- window/door packages and outdoor connections
A simple way to control cost is to:
- keep the plan efficient (reduce wasted hallways)
- avoid unnecessary structural complexity
- choose a cohesive, durable finish package
If you want accurate pricing for your property, schedule a consult: Contact / Start Project
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