City and County Charges to Include in San Diego ADU Bids — 2026
Answer: Contractors should budget both predictable permit/plan-check/inspection charges and variable pass-throughs (sewer, stormwater, impact fees, utility hookups) when pricing San Diego ADUs for 2026. Expect a working allowance roughly in the mid-thousands to low tens of thousands of dollars beyond construction costs depending on ADU size, utility tie-ins, and whether impact or capacity fees apply. Put those line items in the bid as either owner-paid pass-throughs or contractor-paid reimbursables, show timing for payment, and include a small contingency for resubmittals or unexpected utility upgrades.
1. How much extra will I need to add to my ADU bid right now?
For a typical 600–800 sq ft detached or attached ADU in San Diego in 2026, budget an extra $6,000–$25,000 as a working allowance for city and county charges. That range assumes everything from straightforward jobs with existing utilities and no impact fees at the low end, to jobs that require sewer lateral work, meter upgrades, stormwater devices, or impact fees at the high end. Example breakdown for a 700 sq ft ADU (hypothetical allowances): - Permit/plan check/initial inspections: $2,000–$5,000 - Sewer/wastewater connection or capacity charges: $1,500–$8,000 - Stormwater/County runoff or BMP fees: $500–$3,000 - Utility hook-ups (water, gas, electric meter upgrades) passed through: $1,000–$6,000 - Impact or development fees (if applicable): $0–$5,000 - Contingency for resubmittal, inspections, or late fee surcharges: 5%–10% of fees (or $300–$2,000) These are allowances contractors commonly use before permits are issued. The largest variables are whether the parcel triggers impact or capacity fees and whether public-works work (street cuts, lateral replacement, or a new meter) is required. If you expect a sewer lateral replacement or a new meter, list it separately and use the high end of the allowance so owners understand it’s not part of standard labor markup.
2. Which specific city and county charges are common in San Diego for ADUs?
Expect the same core categories on nearly every San Diego ADU: - Core permit and plan-review fees: fees to review plans and issue building permits; these fund plan-check staff and administration. - Inspection fees: either bundled in the permit or billed per inspection and per trade; funds field inspectors and scheduled site visits. - Sewer/wastewater connection or capacity charges: fees for adding a dwelling unit or making new connections; sometimes includes lateral inspection or replacement costs. - Stormwater / water-quality fees and BMP plan-check: fees for meeting stormwater rules and any required post-construction BMP devices. - Impact or development fees (city or county): charged per new dwelling unit or added living area where jurisdictions assess them; funds parks, transportation, and other public services. - Utility hook-up charges (water meter, sewer lateral installation, electric meter upgrade): charges from utilities or contractors for physical connection and equipment. - Public-right-of-way or street-cut permits and bonds: fees and bonds when you excavate the public ROW; ensures proper restoration. - Special plan-check fees and expedited review surcharges: extra charges for specialty reviews (structural, mechanical, electrical) or rush reviews. Some fees are flat, some per square foot or per unit, and others are per inspection or valuation-based. You’ll typically find them listed on the City of San Diego building permit package or on San Diego County public-works checklists for unincorporated areas.
3. How are those fees calculated and where do I check current amounts?
Fees follow a few common formulas: - Per square foot / valuation-based: portions of plan-check and building-permit fees often scale with project valuation or square footage. - Per dwelling unit (per DU): many impact fees and some wastewater capacity charges are assessed per additional unit. - Per fixture or service: some sewer lateral inspections, taps, or meter charges are assessed per lateral or by meter size. - Flat fees: initial permit filing, certain inspection fees, and street-cut bonds are often fixed amounts. Where to verify current amounts: - City of San Diego Development Services Department fee schedules (building permits, plan checks, inspections, ROW permits). - San Diego County Public Works and Department of Environmental Health (for unincorporated areas). - City of San Diego Public Utilities or the local water/sewer district for connection and capacity charges. - Regional stormwater or flood-control district pages for BMP or runoff fees. Use the agencies’ online fee schedules or published resolutions as the authoritative source rather than third-party summaries. Example (hypothetical): if plan-check is 0.5% of project valuation and sewer capacity is $3,500 per DU, then for a $150,000 valuation plan-check = $150,000 × 0.005 = $750 and sewer capacity = $3,500. Always confirm the fee formula on the agency fee schedule because thresholds and multipliers change.
4. Who usually pays each fee and how to present them in the bid so owners understand?
Typical practice divides fees into owner-paid pass-throughs and contractor-paid items that are then invoiced or reimbursed: - Owner pays (common): impact/development fees, utility capacity charges, and most government-assessed fees tied to the property. Contractors usually show these as pass-throughs or require payment at permit pull. - Contractor pays (then invoices or includes): plan-check and permit application fees are frequently paid by the contractor at submittal and invoiced back to the owner or held in escrow. Inspection fees billed per inspection can be handled the same way. - Shared / negotiated: sewer lateral replacement, ROW restoration, and some utility upgrades are often quoted as contractor work with separate permit costs; allocation is negotiated case-by-case. How to present them in the bid: itemize fees so the owner sees what is an estimate, who pays, and timing. Sample lines: - Building permit / plan review fees (paid to City) — estimated $X (owner pays) - Sewer capacity / connection charge (City/Public Utility) — estimated $X (owner pays) - Water meter / utility hook-up (utility charge) — actual cost billed at time of connection - Street-cut permit / ROW bond — estimated $X (contractor to obtain; owner reimburses) - Inspection fees (per inspection) — included in permit or billed as incurred Add clear language: state that amounts are estimates, final bills come from the agency, and the owner will pay any overage beyond the estimate unless otherwise agreed. Also state payment timing: e.g., “plan-check fees paid at submittal” and “utility connection billed at completion.”
5. How to avoid surprises and keep estimates accurate up to permit issuance
Run a short verification routine before you issue a firm bid and put contract language in place to handle changes. Pre-bid checklist: 1. Pre-submittal fee check: look up applicable line items on the City of San Diego Development Services fee schedule and the relevant water/sewer district pages; record the exact fee names, formulas, and amounts. 2. Confirm triggers: verify whether the parcel’s zoning, lot size, and existing utilities trigger impact fees or capacity charges; if unclear, call or email the jurisdiction intake counter and get a reference or note of the conversation. 3. Site-specific utility checks: confirm whether the water or sewer meter size is sufficient or whether lateral replacement or street-connection work is likely. 4. Allow a contingency: include a permit/fee contingency (commonly 5%–10% of estimated fees or a fixed amount) and show it as a separate bid line. 5. Contract fee policy: include clauses that the contractor will invoice actual government/utility charges or that the owner will pay increases beyond the estimate; define an owner-authorization threshold if fees exceed the estimate by a set percentage. 6. Confirm at intake: after submittal, immediately check the official invoice or permit portal for exact charges and adjust the contract or invoice promptly. Timing and inspection triggers that create fee risks: resubmittals trigger additional plan-check fees; expedited reviews carry surcharges; inspections outside normal windows or repeat inspections can add costs; unpaid balances can lead to late penalties. Practical steps during the project: keep screenshots of fee schedules and permit receipts in the project folder; flag time-sensitive items (street-cut bonds, ROW permits) and schedule payments into your cash flow; and notify the owner immediately when permit intake shows a different fee so they’re not surprised.
Conclusion
Before you quote, pull the current fee schedules from City of San Diego Development Services and the relevant utility agencies and write those exact line items into your estimate. Don’t hide permit and utility charges in vague lump sums; show them as pass-throughs or contractor-reimbursable items so responsibilities and timing are clear. A clear bid will include a modest contingency, explicit pass-through lines for city/utility charges, and contract language that defines who pays for resubmittals or unexpected fee increases. That protects your margin and prevents sticker shock for the homeowner when the permit portal posts the final invoice.
Frequently Asked Questions
Are ADU impact fees always charged in San Diego?
Not always. Whether impact or development fees apply depends on the property’s jurisdiction (city versus unincorporated county), local ordinances, and any ADU exemptions the jurisdiction has. Check the local jurisdiction fee policy; if it’s unclear, ask the permit counter to confirm whether the ADU is exempt.
When are plan-check and permit fees due?
Plan-check fees are typically paid at submittal; building permit fees are paid when the permit is issued. Some utilities invoice connection or capacity fees later — at connection or at certificate of occupancy — so check the permit portal and note payment timing in your contract.
How should I handle unknown utility upgrade costs in a bid?
List them as conditional pass-through line items with an estimated amount and a contingency. State that final utility charges are billed at connection and that the owner is responsible for actual amounts above the estimate, subject to an agreed notification threshold.
Do inspection fees add up much?
Inspection fees are usually a modest part of total fees, but they can increase if a project needs many specialty inspections or has multiple resubmittals. Treat inspection costs as part of the permit allowance and include a small contingency for extra trips or missed inspections.
Where exactly do I verify current fee amounts?
Use the City of San Diego Development Services fee schedules for building, planning and ROW permits; consult San Diego County Public Works or Environmental Health for unincorporated areas; and check the local water/sewer district or City Public Utilities for connection and capacity charges. These agencies’ fee schedules and permit portals are the authoritative sources.