Service Details
Design-Build ADUs are projects where one team coordinates design, engineering, permitting, and construction from start to finish. TrueBuild takes this approach for homeowners who don't have plans yet and want a single point of accountability from concept to move-in. We work with trusted design partners to draw the plans, then build them, across San Diego County and Southwest Riverside County.
What "design-build" means for an ADU
The traditional way to build an ADU is with two separate teams: you hire an architect or designer to draw and permit your plans, then you shop the approved plans around to builders to get construction bids. It works, but it can be slow and it creates gaps; the architect designs something, and the builder later finds issues during the bid or build phase that push cost and timeline.
Design-Build collapses those two phases into one. You hire one team that handles design, engineering, permitting, and construction together. The designer and builder are talking to each other throughout, not meeting for the first time after plans are approved. Cost, constructability, and site conditions are factored in from the first sketch.
For a homeowner, the practical difference is this: instead of managing two separate vendors with two separate contracts and two separate schedules, you're working with one team through the entire project. One point of accountability, one schedule, one contract.
How TrueBuild's design-build approach works
TrueBuild ADU is a construction company. Our core capability is building, not drawing. For design-build projects, we coordinate design through trusted design partners: licensed architects and designers we've worked with, vetted, and trust to draw ADU plans that are buildable and priced right.
When you hire us for a design-build project, here's what that coordination looks like:
Initial consultation and site walk: Jose walks your property with you, we talk through what you want out of your ADU (size, layout, use case, budget), and we figure out your best path forward.
Design partner engagement: We bring in our design partner. You work with them directly on the design, and we're in the conversation throughout, flagging constructability or cost issues before they get baked into the plans.
Plans, engineering, and permits: Our design partner handles the architectural drawings and structural engineering. We submit plans and permit for approval, and coordinate timelines with you.
Construction: Once plans are approved and permits are pulled, we handle the full detached ADU build from site prep through final walkthrough. Foundations are poured in-house through Supreme Concrete Group, our sister company.
Why our partner model is better than in-house
Some bigger ADU builders employ in-house architects and designers. On the surface, that sounds like an advantage; one team, one company, one invoice. In practice, the partner model we use is the better arrangement for homeowners, and here's why:
No design markup on top of design fees
Builders with in-house designers have to pay those designers' salaries year-round, whether they're busy or not. That cost shows up in your build cost, often without you realizing it. Our design partners bill you directly for their work, and TrueBuild doesn't take a percentage or a markup on design. You pay for design work once, at the design partner's actual rate.
No bloated overhead passed through to you
In-house design teams are an overhead line item. When projects slow down, that overhead still has to be paid somewhere, and the only 'somewhere' is higher prices on your construction bid. Our lean operating model exists specifically so homeowners don't subsidize overhead they don't need.
Our partners are effectively in-house
We don't rotate through a different designer every project. We work with a small set of vetted, trusted design partners we've built long relationships with. They know ADUs and how TrueBuild operates, we know how they design, and the collaboration is tight. The difference between a 'partner' and an 'employee' at this scale is mostly how they're paid, not how they work with us.
You talk directly with the designer
At bigger firms with in-house design, you usually talk to a Project Manager who relays things between you and their architect. That's fine for simple decisions, but costly for complex ones… things get lost in translation, context gets dropped, and revisions take longer. On a TrueBuild design-build project, you work with the design partner directly. No PM layer filtering the conversation by what's best for them and not you.
You get a third-party perspective
Our design partners don't work only for TrueBuild. They have their own practice, their own clients, and their own experience across many different builders and project types. That outside perspective is genuinely valuable; they catch design issues and opportunities that a fully in-house team wouldn't. You get architectural expertise that's broader than what any one builder's internal team could provide.
Full transparency about who's doing what
We tell you who's drawing your plans. You know their credentials, you sign a contract with them directly, and you know exactly what you're paying for. Compare that to in-house models where the architect's role often gets fuzzy inside a larger 'design-build fee'.
Who design-build fits best
Design-build is the right fit if:
You don't have plans yet and want help from the first sketch through the final walkthrough.
You want one point of accountability for the whole project instead of multiple disconnected contacts.
You care about cost discipline during design. One of the biggest advantages of design-build is that a builder is in the conversation while plans are being drawn, flagging cost issues before they're finalized.
You've picked a pre-approved floor plan from your city and need help getting the site plan and engineering drawn up. Pre-approved floor plans are a good starting point, you'll still need site plans drawn up showing the rest of the property though.
You want a detached, new-construction ADU.
Design-build probably isn't the right fit if:
You already have complete, approved plans. In that case, our Build From Your Plans service is a better match.
You want an attached ADU, JADU, or garage conversion. We don't build those.
Design-build vs. building from your existing plans
These two services sit on opposite sides of the same question: do you have fully approved plans, or not?
If the answer is yes, our Build From Your Plans service is the match. We bid the plans you have and build them; no design markup, and no upsell to re-design.
If the answer is no, design-build is probably the match. You need plans drawn up before anything else can happen, and having a builder involved from the design phase onward prevents the handoff gaps that cause most ADU projects to run late or go over budget.
A third case comes up sometimes: you have a pre-approved floor plan from your city but don't have the site plan, engineering, or Title 24 documents yet. A pre-approved floor plan on its own isn't enough to start construction; you still need custom site plans and engineering drawn up for your specific lot. In that case, design-build is usually the right path, because our design partners can complete those missing pieces for your specific property.
If you're not sure which service fits your situation, Jose can walk through it with you on a free consultation. For the full menu of services we offer, see all our ADU services.
What sets TrueBuild apart on design-build projects
Construction expertise in the design conversation
Most design-build firms started as design firms and added construction later. TrueBuild is the opposite. We started as builders and bring that construction-first perspective into the design phase. That means plans that are buildable, grounded in site reality, and priced before they're finalized.
Foundations poured in-house
Every design-build project we run includes foundation work handled by our sister company Supreme Concrete Group. Same crew, same equipment, same quality control. See our Concrete ADU Foundations page for more on how that works.
Jose on every project
The owner walks the property, participates in design meetings with you and the design partner, signs the contract, and stays involved through final inspection. There's no project coordinator layer, Jose is the single point of contact.
No design mark-up on construction
Many builders charge a design markup even when they're coordinating an outside designer. We don't. The design partner bills you directly for design work; we bill you for construction work. Clean separation, no hidden layer.
What to expect on timeline
Design-build projects take longer than plan-ready builds because design and permitting take time. A typical timeline:
Design phase: 2–4 months. Initial concepts, revisions, finalized plans, engineering, and Title 24 compliance. Timelines vary a lot depending on how many revisions you want and how responsive you are to design partner requests.
Permit submittal and approval: 2–4 months. Varies heavily by jurisdiction. Some San Diego County cities are faster than others, and backlog changes throughout the year.
Construction: 4–6 months for a typical detached ADU. Duplexes, two-story builds, and hillside sites can extend this.
Final inspections and walkthrough: 2–4 weeks.
Total project time from signed contract to certificate of occupancy is usually 10–14 months for a design-build project, compared to 5–8 months for a build-from-your-plans project.
What affects design-build ADU cost
Design-build pricing has two main components: design fees (paid to the design partner) and construction costs (paid to TrueBuild).
Design fees depend on the complexity of your project, how custom the design is, and how many revisions you want. Design partners typically bill either a flat fee based on project scope or a percentage of construction cost. We'll help you understand what to expect before you sign a design contract.
Construction costs depend on the factors you'd expect: size, number of bedrooms and bathrooms, finish selections, site complexity, and permit fees. We don't publish per-square-foot pricing because it misleads more than it informs.
What you won't pay with TrueBuild: a markup on top of the design partner's fee. We don't take a percentage of the design work on design-build projects. You pay the design partner directly for design; you pay us for construction.
For an honest conversation about what your specific design-build project might cost, schedule a free consultation.
Common questions about design-build ADUs
Does TrueBuild have in-house architects?
No, and we think our partner model is actually the better arrangement for homeowners (see above). We work with a small set of trusted, vetted design partners who function effectively as in-house designers, minus the overhead cost that gets passed to you.
Who do I pay for the design work?
The design partner bills you directly for design fees. TrueBuild bills you for construction. We don't take a percentage of design work on design-build projects.
Can I use my own architect and still hire TrueBuild to build?
Yes. If you have an architect you want to work with and you're early in the process, we can still handle construction through a design-build model, we just coordinate with your architect instead of ours. If your plans are already fully drawn and approved, our Build From Your Plans service is a better match.
What if I want to change the design mid-project?
Design changes during the design phase are normal and expected. Design changes after plans are approved and construction has started are expensive and slow because they usually require re-permitting. We'll tell you honestly what a change will cost in time and money before you decide.
How involved am I in the design process?
As involved as you want to be. Some homeowners want to weigh in on every design decision, others want to give a general direction and let the design partner run with it. We can work either way, and you'll be talking directly with the designer, not through a project manager.
Do you offer design-build for attached ADUs, JADUs, or garage conversions?
No. TrueBuild only builds new-construction detached ADUs.