Why an ADU Permit Timeline Is Longer Than a Review Target

Ask what starts and stops the clock

A statement such as permitting takes a month is incomplete without a defined starting event and finish line. Does it start when you hire a designer, upload drawings, pay a fee or receive confirmation that the package is complete? Does it end with first comments, approval or actual issuance? Write these milestones separately before comparing estimates.

An advertised statutory or agency review period also needs its exact conditions checked. Do not take a number from a discussion thread and apply it to all ADU applications. Your useful question is which published rule or service target applies to this application type and what status your application has now.

Separate agency work from applicant work

The San Mateo County: Apply for a Permit process, for its unincorporated jurisdiction, distinguishes completeness review, referrals, corrections and issuance. That is a helpful example of why elapsed calendar time includes more than a reviewer reading plans. San José's San José: Preapproved ADU and Site-Specific Application similarly describes comments and further review where needed.

Create two parallel columns: time waiting for agency action and time waiting for the project team. Missing responses from a consultant, a product change or an unpaid fee belong in the second column. This is not about assigning blame. It allows you to identify the next action that can actually move the file.

Make review cycles visible

Track every comment in a response register. Record its owner, required drawing or document, response date and whether another discipline is affected. A corrected floor plan can create a structural or utility coordination question; uploading it alone may not close the issue. One complete coordinated resubmittal is easier to evaluate than several unexplained versions.

Ask the lead designer to show the register at each project meeting. If the answer is simply waiting on the city, check whether the portal or reviewer has requested anything that remains with the applicant. Conversely, if the package is complete and submitted, record the submission receipt so follow-up is specific.

Keep construction dependencies off the permit promise

ADU construction also depends on contractor availability, materials, site readiness and utility work. The city's San José: ADU FAQ is a starting point for project questions, but a building review target should not be interpreted as a utility construction commitment. Ask each participating organization for its own scope and current scheduling information.

A hypothetical project may receive building comments promptly but spend weeks redesigning a utility route. Reporting the entire delay as city review time prevents the owner from solving the actual problem. Show the utility decision as a separate dependency with an assigned next action and a date for follow-up.

A schedule you can use

Build a milestone list with preparation, completeness, first response, correction completion, resubmission, issuance and inspection planning. For each milestone show the evidence of completion, responsible party and unresolved dependency. Use ranges only when the person providing them explains the basis and what would change the estimate.

Before making a move-out, rental or delivery commitment, ask which milestones are confirmed and which remain forecasts. Update the schedule when scope changes. This approach does not eliminate uncertainty, but it prevents a short review target from becoming an unsupported promise about the date an ADU will be ready to occupy.

A weekly status report with useful evidence

Use five lines: last completed milestone, evidence of completion, current blocker, person responsible and next decision date. Attach the relevant receipt or comment register rather than a percentage-complete estimate. A project described as ninety percent approved can still have one unresolved item that controls issuance, making the percentage less informative than the actual dependency.

Track owner decisions separately. If a material choice or layout change is waiting for approval, show how it affects the next submission. This lets the owner understand which delay they can reduce and which is genuinely outside the project team's control. It also makes follow-up with the agency precise: the package was submitted on a known date with a particular status.

When a forecast changes, write the reason. A new correction cycle, an incomplete outside document and a utility construction delay should not all be described as slow permitting. The classification helps future budgeting and avoids carrying an inaccurate explanation into a contractor dispute or an unrealistic commitment to a tenant.

For an owner who must coordinate temporary housing, keep a decision date separate from the construction forecast. At that date, review confirmed approvals and remaining dependencies before extending or ending temporary arrangements. A forecast may improve as evidence accumulates, but an unverified review estimate should not silently become the basis for an irreversible personal commitment.