Nearly every stalled permit we see in Monterey County was avoidable, and almost none of them failed on design. They failed on something the homeowner did not know was part of the process until the drawings were finished — at which point fixing it means redrawing, not refiling.
RDD Solutions is a residential design and drafting firm in Monterey County. We do not build and we are not an architecture firm; we draw the sets that go through plan check, which means we watch what gets sent back. These are the ones that cost people the most time.
1. Submitting Without As-Builts
The most expensive mistake on the list, and it happens because it looks like a shortcut.
Plan check reviews your project against the house you actually have. If the set shows a proposed kitchen but describes the existing structure from memory, a listing sheet, or drawings that stopped matching the building three remodels ago, the reviewer has no reliable baseline — and neither does your structural engineer or your contractor. What comes back is not a small correction. It is a request to document existing conditions properly, which means measuring the house and redrawing the set around real dimensions.
On older Peninsula homes the original drawings frequently never existed. Measured as-built drawings are the first real deliverable of a remodel, and treating them as optional overhead is how a project loses a month.
2. Assuming Windows Do Not Need a Permit
Windows always require a permit in the City of Monterey. Every replacement, including a like-for-like swap into the same opening. There is no maintenance exemption to fall back on.
A window is not just glass. It carries egress sizing where the room requires an escape opening, tempered glazing where the code calls for it, the weather barrier detail where the frame meets the wall assembly, and energy certification — all four permit matters.
The pattern is consistent: a homeowner books an installer for a whole-house window package, work starts, and the permit question surfaces mid-installation. If the windows are visible from outside there is a second step in front of the building permit, because exterior changes including windows, doors and siding need Planning approval first. That sequencing turns a two-week job into a two-month one. The statewide version sits in our guide to California building permit requirements.
3. Designing a Fixture Relocation Before Checking Water Credits
This one is genuinely local, and it changes the design rather than the paperwork. If a project adds or relocates plumbing fixtures, a waiver or permit from the Monterey Peninsula Water Management District is required, and the property must have sufficient water credits. Credits attach to the parcel and its water history, not to your project.
The failure mode is sequencing. A homeowner spends six weeks settling a bathroom layout around a relocated shower and an added second sink, then discovers the parcel does not support the fixture count, and the design goes back to the start. Ask the water question in week one, before a layout is worth defending. If fixture count and locations can stay where they are, most of this goes away — sometimes reason enough to keep them.
4. Treating a Second Story as a Building-Permit-Only Project
A second-story addition in the City of Monterey triggers architectural review on its own. So does a new two-story residence, a lot under 5,000 square feet, and a slope over 15% — and many older Peninsula lots meet more than one at once. Six neighborhoods carry review independently of all of it.
Architectural review runs alongside building plan check on its own schedule, and it can require story poles — temporary frames erected on site so reviewers and neighbors can see the proposed height and mass against the sky. Poles take time to build and they invite comment.
None of that argues against building up. It argues for knowing at the concept stage which track you are in, because a design review submittal wants different drawings than a plan check submittal, and finding out late means drawing twice. What a second story involves, and how it compares to building out.
5. Not Budgeting for One Round of Corrections
City of Monterey plan check timelines researched in 2026 ran roughly 15 business days for projects under $100,000 and about 20 business days for $100,000 to $1 million, plus about 4 days of intake before the clock starts.
People read those numbers as the whole story. They describe one pass. Reviewers ask questions, the set is revised and resubmitted, and the review period runs again — and intake is separate, so a package that is not complete on arrival is handed back without entering the queue.
One round of corrections is normal. It is not a sign that the drawings were bad or the reviewer difficult. The homeowners who find permitting miserable are usually the ones who gave a contractor a start date built on a single-pass timeline. Put a correction round in the calendar and the process stops feeling like a fight.
6. Assuming a Sloped Lot Will Not Need a Soils Report
Monterey County sits in a high seismic setting, and a geotechnical investigation is generally expected — the county’s published policy points at slope instability, liquefaction, soil strength loss and differential settlement. The building official may waive a full investigation where soils conditions are known from prior nearby work. As published, the situations that may avoid a full report are small and specific: one-story additions of 500 square feet or less on level, undisturbed grade, and a short list of similar cases.
Slopes of 3:1 or steeper require sign-off by a California Certified Engineering Geologist or registered geotechnical engineer. A soils report is a lead-time item with a specialist attached, so discovering the need for one after the drawings are complete is a schedule problem rather than a budget one. What actually triggers a geotechnical report on a hillside lot.
Requirements and timelines described here were researched in September 2026 and are typical rather than guaranteed. Verify current requirements with the building department for your jurisdiction.
Permit Mistake FAQs
Why was my permit application rejected at intake?
Intake is a completeness check, not a review. A package missing existing conditions drawings, structural details, energy documentation or required sheets is handed back before plan check, so the review clock never starts — which is why the calendar slips before anyone has looked at your design.
Do I really need a permit to replace windows in Monterey?
Yes. Windows always require a permit in the City of Monterey, including like-for-like replacement, because the permit covers egress sizing, tempered glazing, the weather barrier detail and energy certification. If they are visible from outside, Planning approval is generally needed first.
How many rounds of plan check corrections should I expect?
Plan for one. Timelines researched in 2026 for the City of Monterey ran roughly 15 business days under $100,000 and about 20 for $100,000 to $1 million, plus intake — and each describes a single pass. A correction round is routine.
What are water credits and when do they apply?
They apply whenever plumbing fixtures are added or relocated. A waiver or permit from the Monterey Peninsula Water Management District is required and the property must have sufficient credits, which attach to the parcel rather than the project. Check before the layout is settled.
Do I need an architect to avoid these problems?
No. For most single-family residential work in California, a building designer or drafting firm can prepare the plans, with a licensed structural engineer providing calculations where required. Where the line actually sits.
Get the Sequence Right the First Time
Most of what goes wrong here is order of operations, not skill. Tell us the address and what you want to do, and we will tell you which reviews apply and what has to be settled before anything is drawn. Start with a consultation, or read the full guide to permits in the City of Monterey.