By finoy61966 April 23, 2026 - 6:54am

"Full-service" is the most abused word in the adu builder market. Every website uses it. Almost none of them mean the same thing. Some companies include permits. Some don't. Some handle inspections. Some hand you a plan set and a phone number for a framer they met once. The word is doing all the work, and none of the disclosure.

 

This post breaks down what a real full-service scope covers, what it deliberately leaves out, and how to read a proposal so you can tell the difference before you sign.

 

What Is the Current Market Reality?

The current market reality is that "full-service" spans a spectrum from vertically integrated operators to thin marketing wrappers around a manufacturer. On one end, you get a single accountable partner handling feasibility, design, permits, factory production, site work, install, and inspections. On the other end, you get a sales page that promises the same thing and delivers a shipping manifest.

 

The California adu california buyer has to do the disambiguation themselves. Nobody else will do it for them.

 

What Should a Full-Service ADU Builder's Feature Checklist Include?

A full-service adu builder's feature checklist should cover every phase from lot review to certificate of occupancy under one contract, one accountable party, and one price structure. Here are the specific inclusions to verify in writing.

Lot Feasibility and Zoning Review

Included when it should be. Before any design work, the builder evaluates whether your lot supports the unit you want.

Setback and Envelope Analysis

The proposal should name the setbacks, height limits, and lot coverage rules that apply. Generic language like "we'll check zoning" is not analysis.

Utility Capacity Check

Water, sewer, electrical panel capacity, and gas routing all affect cost. A real feasibility review surfaces utility upgrades before pricing, not after.

Design and Engineering

Included. Stamped plans aligned with Title 24, CBC, and if applicable WUI standards.

Title 24 Compliance Docs

These are not optional in California. The builder should deliver the compliance package as part of the permit set, not as a change order.

Structural Engineering

For prefab adu units, structural engineering reflects both the factory assembly and the on-site foundation. A full-service operator owns both.

Permit Submission and Management

Included. The builder submits the permit application, responds to city comments, and manages resubmittals.

City Comment Response

Expect two to three rounds of city comments on most California jurisdictions. The builder absorbs this work. You do not walk plans into the counter yourself.

Site Work and Foundation

Included. Grading, excavation, foundation, and utility trenching.

Factory Production

Included for prefab builds. The home is produced in a controlled facility while site prep runs in parallel.

Delivery, Crane Set, and Install

Included. The logistics of transporting and setting a prefab unit — including street closures and crane staging — should be the builder's problem, not yours.

Inspections and Final Close-Out

Included. The builder coordinates and attends inspections, fixes flagged items, and delivers the certificate of occupancy.

 

How-To Walkthrough: Reading a Proposal for Scope Gaps

Reading a proposal for scope gaps is a matter of checking each phase against the contract language. Here's how to run the review.

 

1. Ask for a written scope of work. Not a pitch deck. A scope.
2. Check each phase is named. Feasibility, design, permit, site, factory, install, inspection.
3. Look for exclusions. Good proposals list what's not included. Bad ones stay silent and bill you later.
4. Verify who signs inspection forms. If your name is on the permit as the responsible party, you're not hiring full-service.
5. Confirm who pays resubmittal fees. City comments cost money. That cost lives with the builder in a real full-service engagement.
6. Check the adu cost structure for triggers. Fixed pricing should name what causes adjustments — typically unforeseen site conditions, not normal design iteration.
7. Ask what happens if the city rejects the plan set. The answer reveals everything.

 

What Pitfalls Should You Avoid?

The pitfalls are the scope gaps that look small in the proposal and become large on the project. Watch for these specifically.

 

• "Permit expediting services" as a separate line. This often means the builder is not the permit holder. It means you are, and they're selling you help.
• "Site work by others." This shifts grading, utility trenching, and foundation to your general contractor. If you don't have one, you need one, and the coordination is yours.
• "Delivery and install quoted separately." A prefab adu vendor who sells the box and outsources the setting is not full-service. They're a manufacturer.
• No inspection line item at all. Inspections happen. If the scope is silent, the cost lands on you.
• Vague Title 24 and WUI references. If the proposal mentions these without specifying deliverables, you're the one responsible for compliance documentation.

 

What Full-Service Builders Explicitly Don't Do

This is the honest part. A full-service builder is not a custom architect, not a landscape designer, and not a general contractor for unrelated home renovations. Expect:

 

• Fixed floor plans. Not fully custom design. The speed and price advantage depends on standardized layouts.
• Standard finish packages. Upgrades are possible. A blank-canvas interior design engagement is not the scope.
• Main-house work is out of scope. Kitchen remodels and primary residence upgrades are a different contract.

 

Knowing this up front prevents the scope argument six months in.

 

Frequently Asked Questions
What does "full-service ADU builder" actually mean?

A full-service adu builder runs every phase of the project under one contract — feasibility, design, permits, factory production, site work, installation, and inspections. One accountable party, one schedule, one price structure. Anything less is partial-service with extra marketing.

How much does a full-service ADU cost in California?

A turnkey full-service build in California typically ranges from $180K to $350K depending on size, finish level, lot conditions, and jurisdiction. The real adu cost only becomes fixed after a property survey and general contractor review, which is why credible builders won't commit to a number in the first call.

Is prefab the same as full-service?

No. Prefab is a construction method. Full-service is a scope of work. Some prefab adu companies sell only the box and leave site work to you; others, like the team at LiveLarge Home, combine prefab construction with permit, install, and inspection management. Always confirm the scope, not just the method.

Who handles inspections on a full-service ADU project?

On a true full-service engagement, the builder schedules, attends, and responds to inspections, including any corrections flagged by the inspector. If your contract makes you the responsible party on the permit, you're handling inspections yourself regardless of what the marketing says.

 

The Cost of Misreading the Scope

A misread scope on an adu project shows up as surprise invoices, a permit stuck in review, and a foundation pour delayed because nobody confirmed who was pulling the trench permit. The fix is upstream, not downstream. Read the proposal the way an inspector reads a plan set: line by line, looking for what isn't there. The answer you get before you sign is the project you get after.