ADU Permits in Morgan Hill: The 2026 Process, Fees, and Timeline

Morgan Hill follows California’s state ADU standards through Municipal Code chapter 18.84, which means your permit is ministerial: no public hearing, no neighbor approval, and a required decision within 60 days of a complete application. The city adds a genuinely useful layer on top, a pre-approved plans gallery that connects homeowners directly with designers whose ADU plans the city has already reviewed.

The short version: Morgan Hill applies the statewide ADU baseline: up to 1,200 square feet detached, 4 foot side and rear setbacks, no owner-occupancy requirement, at most one parking space with broad exemptions. Check whether your lot sits in a special zone (historic, hillside, high fire severity, or flood) before you design. We run the entire permit for you, with a permitting budget built into one project price.

The Morgan Hill ADU permit process, step by step

1. Confirm the baseline for your lot. State law guarantees nearly every single-family lot a detached ADU, up to 1,200 square feet, and never less than an 800 square foot, 16 foot unit with 4 foot side and rear setbacks. Morgan Hill’s development standards live in chapter 18.84 and track the state framework. See the cited rules in our Can I build? lookup.
2. Screen for special zones. Parts of Morgan Hill fall in historic, hillside, high fire severity, or flood zones, and those overlays can limit what you can build or add requirements. This is the single most important early check in this city, and it is exactly what our free property analysis screens for.
3. Choose your design path. The city’s pre-approved plans gallery lets you browse pre-reviewed designs, then complete site-specific planning for your lot. A factory-built home arrives with its own complete engineered plans, which accomplishes the same thing: a package the city can review without surprises.
4. Submit the full application. Site plan, floor plans, structural, and Title 24 energy documentation. The 60-day ministerial clock starts once the city deems the application complete.
5. Plan check, permit, inspections. Objective review, permit issuance, then foundation, utility, and final inspections.

Work with us and steps 1 through 5 are our job, with a permitting budget built into the one project price. Your exact permit and city fees are confirmed in your feasibility study.

More units than you might expect

Morgan Hill spells out a combination that surprises many owners: a single-family property can have a JADU, an internal conversion or attached ADU, and a detached ADU. The JADU is up to 500 square feet inside the main home’s walls, may use an efficiency kitchen, can share a bathroom with the main house, and requires the owner to live on the property. Multifamily properties can go further, up to 8 detached ADUs or 25% of the existing unit count.

For most families, though, the decision is simpler: one good detached unit. Our 660 square foot Six Sixty at $309,000, all-inclusive of construction, is a regional favorite among our clients, and the 749 square foot two-bedroom at $369,000 adds a second bedroom while staying under the 750 square foot impact-fee threshold. The county-wide context is in our Santa Clara County ADU regulations guide.

Morgan Hill ADU fees

State law does the heavy lifting here: impact fees are waived for ADUs under 750 square feet, and at 750 or larger they must be proportional to the primary dwelling. Building permit fees scale with project size. We itemize the exact figures for your address in the feasibility study, and whatever they are, they are included in your contract price, so the city fee schedule never becomes your problem.

How long the permit takes

Plan on the 60-day ministerial window from a complete application, plus design and plan preparation time in front of it. Special-zone parcels can take longer, and review speed ultimately rests with the city, not with any builder. The compensating advantage of a factory build: while Morgan Hill reviews your plans, your home is already taking shape in our Salinas factory, about 40 minutes away. The full schedule lives in our Morgan Hill ADU timeline guide.

Frequently asked questions

Does Morgan Hill require a hearing for ADU approval?

No. ADU review is ministerial under state law and chapter 18.84: the city checks objective standards and must act within 60 days of a complete application.

What if my lot is in a hillside or fire zone?

Special zones (historic, hillside, high fire severity, flood) can limit what you can build or add engineering and materials requirements. Ask the city first, or let us screen your parcel during the free property analysis; it is the first thing we check in Morgan Hill.

Can I have both a JADU and a detached ADU?

Yes. Morgan Hill allows a JADU, a conversion or attached ADU, and a detached ADU on a qualifying single-family property. The JADU requires owner-occupancy; the standard ADU does not.

Do I have to add parking?

At most one space, and broad state exemptions apply: within a half mile walking distance of transit, when replacing a garage, and for conversions. Many Morgan Hill lots qualify; we confirm yours before design.

Start with your parcel, not the paperwork

In Morgan Hill the make-or-break question is usually the overlay zone, not the ADU rules themselves. Book a free property analysis and our team will pull your records, screen the special zones, and tell you exactly what your lot supports, all in one free 30-minute conversation.