ADU permit cost and fee breakdown in Campbell, California
GetYourPermit’s researched permit-fee range for a detached accessory dwelling unit in Campbell, with category estimates and direct reference links used in our investigation.
Prepared by GetYourPermit editorial teamReport an error
ADU size
California prohibits development impact fees for ADUs of 750 sq ft or less, so the 749 / 750 / 751 steps are worth comparing.
Estimated total
GetYourPermit researched range at 750 sq ft
$9,070 – $13,203
This estimate combines our fee-schedule research and project-planning experience. Actual charges vary by parcel, plans, valuation, utilities, and outside agencies.
Typical planning amount
$11,136
Modeled at the 600 sq ft reference.
Where the money goes
These are fee components within the permit process, not separate approvals.
- Separate planning / zoning fee$259
Shown only where the City bills Planning or zoning review as a separate fee.
- Building plan check$1,366 – $2,040
The Building Division’s review of the drawings; part of the Building Permit process.
- Building permit issuance$4,140 – $6,180
The permit issuance charge; where plan check is bundled, the combined amount is carried here.
- School district fees$2,200 – $2,345
Possible school-district developer fees based on current thresholds and scope.
- Utility fees$805 – $2,079
Possible water, sewer, electrical, meter, or capacity-related charges.
- Surcharges, taxes & state fees$300
Percentage surcharges, construction taxes, and State-mandated charges.
The darker segment is the low end of the range; the full bar is the high end.
Published fee references
Building permit issuance
The permit issuance charge; where plan check is bundled, the combined amount is carried here.
| Fee | Amount | Basis | Source |
|---|---|---|---|
| Valuation-based building permit | From $237 | Formula | FY 2027 Master Fee Schedule — Effective July 1, 2026Location: FY 2027 Master Fee Schedule, page 12, Building Fees items 1–2Confirms: The current City schedule gives the minimum and valuation tiers for Building Permit Fees. |
Plan check
Review of your drawings for code compliance.
| Fee | Amount | Basis | Source |
|---|---|---|---|
| Building plan check | 33% formula | Formula | FY 2027 Master Fee Schedule — Effective July 1, 2026Location: FY 2027 Master Fee Schedule, page 12, Building Fees item 5Confirms: The current City schedule lists plan check as 33% of the building permit fee. |
| ADU post-entitlement planning check | $259 – $647 | Estimated range | FY 2027 Master Fee Schedule — Effective July 1, 2026Location: FY 2027 Master Fee Schedule, page 8, Planning Fees item 74(b), Accessory Dwelling UnitsConfirms: The current City Planning Fees table states separate post-entitlement plan-check fees for detached, attached, and converted ADUs. |
Impact fees
Development impact fees. Prohibited for ADUs of 750 sq ft or less.
| Fee | Amount | Basis | Source |
|---|---|---|---|
| ADU park in-lieu fee | $9,328 | Flat fee | FY 2027 Master Fee Schedule — Effective July 1, 2026Location: FY 2027 Master Fee Schedule, page 14, In-Lieu/Impact/Mitigation Fees item 2(c)–(d)Confirms: The current City schedule lists a $9,328 per-unit ADU park in-lieu fee for 750 square feet or larger, subject to the State-law cap condition. |
Surcharges, taxes & state fees
Percentage surcharges, construction taxes, and State-mandated charges.
| Fee | Amount | Basis | Source |
|---|---|---|---|
| Construction license tax | $0.50 / sq ft | Per square foot | FY 2027 Master Fee Schedule — Effective July 1, 2026Location: FY 2027 Master Fee Schedule, page 12, Building Fees item 12Confirms: The City current Building Fees table lists Construction License Tax at $0.50 per square foot. |
These are estimates, not official fees
Use these figures for early budgeting only. They are not a quote, not a government fee determination, and not legal advice. Actual fees depend on your parcel, your plans, your construction valuation, your utility provider, and the fee schedule in force on the day your permit is issued. Confirm every number with Campbell before you commit money.
City reference pages for verification
Back to Campbell · Permit process · Build a permit report · How we build these estimates