Design and engineering
Existing-condition documentation, design, consultant work, energy documentation, and coordination.
Field note 05 · Cost
Fullerton ADU cost begins with a defined scope.
An online price band cannot see the property, structure, utilities, finish decisions, or City comments. A useful budget separates categories, assumptions, allowances, and unresolved conditions.
01 · Budget structure
Keep unlike costs in separate columns.
City and agency
Application, plan review, permit, impact, utility, and other applicable charges—verified for the actual project.
Utilities and site
Trenching, connections, service capacity, drainage, access, demolition, protection, and restoration.
Construction and finish
Structure, envelope, systems, interiors, fixtures, selections, and documented allowances.
02 · Comparison test
Compare inclusions before totals.
| Check | What clarity looks like |
|---|---|
| Scope boundary | Included work, exclusions, and owner responsibilities are named. |
| Allowance | The item, amount, selection responsibility, and adjustment method are visible. |
| Site assumption | Access, soil, utilities, existing conditions, and protection assumptions are stated. |
| Revision milestone | The proposal says when drawings, selections, or agency responses will refine the number. |
03 · Contingency logic
Unknown is a category—not a promise.
Contingency should respond to the project’s level of documentation and risk. It is not a substitute for investigation, and this site does not provide a project price or financial advice.
City-cost checkpoint
Use Fullerton’s current applications and fee resources for live City information. Ask the applicable departments or utilities about project-specific charges rather than copying an old fee from another property.