Most ADU companies design, price, and build the same project. We deliberately don't. Here's what changes for a homeowner when the company managing the work isn't also bidding on it.
When we built Casita, the first real decision was one most homeowners never see: whether to be the contractor.
The default in the ADU market is the design-build general contractor. One company draws your plans, prices the work, and builds it. It's a genuinely convenient package, and for some projects it's the right one. But it has a structural feature worth naming out loud: the company producing your budget is the same company that gets paid to build to it.
We went the other way, and said so publicly in August 2026. Casita is a construction management agency. We don't bid on your build.
Design. Bid. Build.
Three words, in that order, and the order is the whole argument.
Design. We start with feasibility on your actual parcel — what the zoning allows, what the setbacks and utilities let you put where, what it plausibly costs. Then we design to that, and take it through permitting.
Bid. Once there's a permitted, fully specified plan set, we take it to qualified builders and run a competitive bid. Every builder prices the same drawings and the same scope, which is the only way a comparison between two numbers means anything.
Build. You pick the builder. We manage the construction — schedule, inspections, change orders, quality — as your representative rather than as the party being managed.
Why the sequence matters more than it sounds
The common failure in an ADU project isn't a bad builder. It's a homeowner committing to a builder before the project is defined well enough to price.
Early ADU numbers are usually quoted off a rough size and a finish level. That's fine as a sanity check, and it's what our own cost estimator is for. It is not a bid. The difference between an early number and a real one is everything a permitted plan set contains: foundation type, how far the sewer run actually is, what the panel upgrade costs, whether the lot needs grading or a retaining wall, what Title 24 forces on the mechanical system.
When you sign before that work exists, those items don't disappear. They arrive later, as change orders, against a contract you've already signed and a builder you've already committed to. Your leverage was highest before you signed — which was also the moment you knew the least.
Designing and permitting first inverts that. By the time you're choosing a builder, the unknowns are mostly resolved and priced, and you're comparing complete bids on a defined scope instead of estimates on a sketch.
What "we don't bid" actually buys you
It's easy for a company to say it's on your side. The useful question is what would have to be true for that to be structural rather than rhetorical.
In our case: we are not a bidder. There is no version of your project where Casita wins the construction contract. That has a few concrete consequences.
- We can tell you a bid is high. A design-build contractor reviewing its own price isn't in a position to do that.
- A cheaper builder isn't a loss for us. Our fee doesn't move with the construction number, so we have no reason to steer you toward the expensive bid or away from the lean one.
- We can push back during construction. Change orders get evaluated on whether they're legitimate, not on whether they're ours.
- You choose. We assemble the comparison, explain where the bids genuinely differ, and flag the ones that are cheap because something was left out. The selection is yours.
That last point matters more than homeowners expect. Two ADU bids that differ by $40,000 are frequently not describing the same building. Reading that difference — allowances, exclusions, who's carrying the utility work, whether the site work is real or a placeholder — is most of the value of a bid review.
The honest tradeoffs
This model isn't free, and it isn't right for everyone.
It's not the fastest path to a signed contract. Design and permitting come first, and permitting takes as long as your jurisdiction takes. If your priority is breaking ground next month, design-build is a shorter runway.
There are two relationships instead of one. You have a contract with your builder and an agreement with us. Some homeowners genuinely prefer one throat to choke, and that's a legitimate preference.
You're paying for management explicitly. In a design-build contract, project management is bundled into the construction price — you're paying for it either way, just not on a separate line. Some people would rather not see the line. We'd rather it be visible, because a fee you can see is a fee you can evaluate.
Where it tends to pay for itself is on projects with real uncertainty: difficult lots, tight budgets where a competitive bid moves the number meaningfully, or homeowners who want to understand the decisions rather than delegate them wholesale.
How this shows up on a real project
In practice the sequence looks like this: a free site walk and feasibility review, early cost planning against your actual parcel, design, permit submittal and correction responses, a competitive bid package to qualified builders, a side-by-side bid review, your selection, then construction management through final inspection.
You can read the full phase-by-phase version on our process page, and what's included at each stage on services. Homeowners who want to run the build themselves but still want the design, permitting, and bid work done properly can look at owner-builder support.
The short version
Understand the project before you commit to who builds it. Get a permitted plan set, put it out to bid, compare real numbers from real builders, and have someone in your corner during construction whose compensation doesn't depend on the construction number.
That's the whole idea. We called it Design. Bid. Build. because it's genuinely just those three things, in that order.
Read the announcement: Why CASITA Chose Construction Management Over the Traditional ADU Contractor Model (PRLog, August 25, 2026). More announcements on our press page.
Thinking about an ADU and not sure which model fits your project? Book a free site walk and we'll walk through both honestly.