Design and engineering
Existing-condition documentation, design, consultant work, energy documentation, and coordination.
Field note 05 · Cost
Fullerton ADU cost depends on the work in the bid.
An online price band cannot see the house, utility routes, finish selections, or City comments. A working budget separates priced work, allowances, owner purchases, and items that still need investigation.
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.
04 · Complete project budget
Keep the costs outside the building bid visible.
Owners may pay for survey work, design, engineering, energy documentation, agency fees, utility coordination, testing, title or property research, and owner-selected products in addition to the contractor’s construction scope. Which items apply depends on the property and agreement.
Ask every bidder to state whether demolition, hauling, temporary protection, trenching, service upgrades, grading, drainage, landscape repair, appliances, window coverings, and final cleaning are included. Record the tax, delivery, installation, and markup treatment of allowances.
A contingency is easier to size after open risks have been listed. It does not make undefined work disappear. Update the budget when drawings change, a utility answer arrives, a selection exceeds its allowance, or field investigation changes the scope.
Get a contractor’s read
Let’s talk through the work behind the drawing.
Share the goal, the existing conditions, and the documents on hand. The next step may be a field check, a records search, or a tighter scope.