Design OTB
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Design OTB, also known as Outside the Box Design and Drafting, is a long-established drafting and design firm based in Santa Rosa with service areas extending to San Diego and Los Angeles. The company has been in business for over fifteen years, which provides a depth of experience with California's building codes and permitting processes across three distinct regions. Their name emphasizes custom thinking over template solutions, and their service model backs that up: they focus on creating original, site-specific drawings rather than selling prefab plans.
The firm's core business is precision drafting and design across several building types, but they've made ADU design a distinct service offering within their portfolio. Their ADU-specific services include site plans, floor plans, elevations, building sections, and construction detail drawings. They handle detached ADU designs, garage conversions to accessory units, and backyard cottage layouts. All of these come as permit-ready drawing packages, meaning the output is structured and detailed enough to submit directly to the building department. Custom ADU plan design is available when you want an original design tailored to your specific lot, constraints, and goals rather than selecting from a pre-drawn template.
What makes Design OTB's approach notable is their emphasis on the consultative process. Rather than selling a plan off-the-shelf or providing generic templates, they work through a personalized design workflow. They gather details about your property, understand your project goals, and then create customized layouts that work around your lot size, existing site features, building constraints, budget, and lifestyle needs. This collaborative approach typically means multiple revision rounds during the drafting phase before you reach final drawings, which is a standard part of a design firm's workflow but worth understanding if you're comparing them to firms that may charge per revision or have limited revision allowances.
Pricing for Design OTB is handled through personalized quotes rather than published pricing tables. The cost depends on project complexity and scope, and they acknowledge that detached ADUs, garage conversions, and custom layouts each have different cost profiles. They offer free consultations to discuss your project and provide a quote, so there's no charge to explore options or get a rough estimate. This removes one barrier to initial contact, though you will need to have a preliminary conversation before seeing a number. The advantage of this approach is that your quote reflects your actual project complexity rather than forcing every garage conversion into the same price band.
The firm's Santa Rosa headquarters sits in what they describe as the heart of California Wine Country, which signals familiarity with both rural residential properties and the specific permitting environment of Sonoma County. Sonoma County ADU regulations differ from those in San Diego County or Los Angeles County, and a firm with deep roots in a region typically has shortcuts and workarounds for local quirks. The expansion to San Diego and Los Angeles adds significant geographic reach, covering two of California's largest metros. This multi-region footprint means you're not hiring a generalist firm learning your local codes on your project's timeline; you're hiring a firm that has completed numerous ADU projects under the specific building departments you'll be dealing with.
The drafting quality and level of detail matters for permit approval. A complete construction document set for an ADU typically includes architectural drawings (plans, elevations, sections, details), structural drawings (if required by your city), and MEP (mechanical, electrical, plumbing) coordination. Design OTB advertises precise and detailed drafting as a core offering, meaning their output is construction-grade documentation ready for building department review, not sketch-level drawings. This matters because incomplete or ambiguous drawings often get rejected or sent back for corrections, adding time and cost. A firm that's spent fifteen years building a reputation around precision drafting understands what makes documents pass the first review rather than requiring rework.
Design OTB's service model is design and drafting only, which means you're not paying for any of the firm's own construction oversight, general contracting, or construction administration unless you purchase those as add-ons. This keeps costs focused on drawings and leaves you free to hire builders or construction supervisors separately. It also means you retain direct control over the permitting process and can work directly with your building department without a middleman.
The contact information on their website is direct: 707-495-8950 or sethgilley@gmail.com. This suggests a small, personable firm where you'll talk directly with the principal rather than navigating a large office structure. For some clients, this direct access is a real advantage. You're working with someone who understands the principles of the design rather than passing through a filter of account managers.
The revision process is where Design OTB's custom approach becomes tangible. Rather than handing you a fixed plan and charging for every change, they work through revisions as part of the design process. This typically means the firm sketches initial concepts based on your constraints and preferences, you review and provide feedback, they refine, and this cycle continues until the final design reflects your needs and the site's realities. This beats the template-plan model where you're locked into a predefined layout and forced to either accept it as-is or pay change orders. For homeowners with specific requirements or unusual lot shapes, this collaborative refinement is worth the time it takes.
One consideration is that Design OTB doesn't showcase a public portfolio of completed ADU designs on their website. While they've completed projects across their service regions, you won't see examples of specific units they've designed unless you contact them and ask. For a 15-year-old firm, a visible portfolio would strengthen confidence, but it's possible they keep project photos off the web at clients' request or simply haven't invested in portfolio marketing. This is a minor limitation, not a red flag, and you can ask for references or examples during your initial consultation.
Design OTB is a good fit for homeowners in Santa Rosa, San Diego, or Los Angeles who value working directly with experienced local drafters and who appreciate the consultative, custom-design approach over template plans. If you're in Sonoma County or one of the Southern California metros and want a firm with genuine roots in your region and a 15-year track record, they're worth reaching out to for a free quote. The emphasis on precision drafting and a personalized process aligns well with the reality that every ADU project is unique and benefits from site-specific design rather than one-size-fits-all planning.