How Long Does an ADU Take in Morgan Hill? A 2026 Week-by-Week Timeline

A factory-built ADU in Morgan Hill typically takes about 5 to 9 months from first call to move-in. The city reviews ADUs ministerially under state standards (Municipal Code chapter 18.84), which means a decision within 60 days of a complete application and no public hearing. The one scheduling question that matters more in Morgan Hill than in neighboring cities: whether your parcel sits in a special zone, historic, hillside, high fire severity, or flood, because overlays add preparation weeks up front. And as everywhere, the pace of review is set inside city hall, not by anyone you hire.

The short version: Week 1 screens your parcel for special zones. Weeks 3 to 8 design and prepare plans. Weeks 8 to 20 the city reviews while your home is built in our factory 40 minutes away. The close is quick: crane set, hookups, final inspection.

The Morgan Hill ADU timeline, week by week

Weeks	Phase	What happens
1 to 2	Property analysis	Free 30-minute review, including the special-zone screen
2 to 4	Site visit + feasibility study	Site visit at no charge; the feasibility study prices the project exactly and scopes overlay documentation if needed
4 to 8	Design + plans	Model locked, site plan, structural, Title 24
8 to 20	Permit review	60-day ministerial clock from a complete application
10 to 22	Factory build + foundation	Parallel with permitting
Final week	Delivery + finish	Crane set in one day, hookups, final inspection, keys

Taken together: about 5 months best case on a small model with a clean parcel, roughly 9 at the large end or where overlays add lead time. Site-built ADUs typically run 16 to 24 months.

What moves the schedule in Morgan Hill

The overlay screen is week one for a reason. Historic, hillside, high fire severity, and flood zones can each add requirements, extra engineering, materials standards, or documentation, and finding out mid-design is how projects lose a month. We screen your parcel before anything is drawn. The rules themselves are covered in our Morgan Hill ADU permits guide.

Pre-reviewed designs shorten review. Morgan Hill’s pre-approved plans gallery exists to cut plan-check time for standard designs. A factory home accomplishes the same thing by arriving with complete, engineered, previously-plan-checked drawings.

Complete paperwork is what arms the 60-day clock. The state protection applies to complete applications only. Package quality is schedule quality.

The parallel build

While Morgan Hill reviews your plans, your home is being assembled about 97% complete in our Salinas factory, roughly 40 minutes away over the Coyote Valley. Your foundation is poured and cured in the same window, so permit time and build time overlap instead of stacking.

The final number follows the floor plan. The 660 square foot Six Sixty at $309,000 all-inclusive, which carries a permitting budget confirmed exactly for your parcel in the feasibility study, runs about 5 months best case; the 749 square foot two-bedroom at $369,000 stays under the impact-fee line; the 1,200 square foot three-bedrooms run 7 to 9 months, permitting willing. On Morgan Hill’s larger lots, some families also add a JADU inside the main house, up to 500 square feet, which the city explicitly allows alongside a detached ADU; see our JADU vs ADU guide for how the two differ.

Frequently asked questions

How long does the Morgan Hill permit take?

From a complete application, state law requires a decision within 60 days. Total permitting usually falls between 60 and 90 days, longer where an overlay zone adds documentation. No hearing in any case.

My lot is in a fire severity zone. How much time does that add?

Typically weeks of upfront engineering and materials documentation rather than months, if it is identified before design starts. That is exactly why the overlay screen is our first step in Morgan Hill.

Can the factory really build before the permit issues?

Yes. The factory build and the city’s paper review run simultaneously, which is the structural advantage over site-built construction, where crews cannot start until the permit is in hand.

What is the fastest realistic Morgan Hill timeline?

About 5 months for a smaller model on a clean, overlay-free parcel with tidy permitting. We plan for it and never promise it, because review workload belongs to the city, not to us.

Screen your parcel first, free

In Morgan Hill the schedule is decided in week one, at the overlay map. Book a free property analysis and our team will screen your parcel, confirm your envelope, and map your dates. Thirty minutes of your time, zero dollars.