Frequently Asked Questions About ADU Builders in Redlands
We hear the same questions from Redlands homeowners at the start of almost every project. So we’ve answered them here, grouped by topic, with the same straight answers we give when you call. If you don’t see your question, our phone is at the bottom.
What should I know before hiring an ADU builder in Redlands?
The single most important thing to know is that the ADU decision is really two decisions: prefab or site-built, and which platform or builder fits your lot. In Redlands, that means thinking through lot slope, where the utility connections run, and how the unit will sit against your existing setbacks before you pick a product. We’re brand-agnostic, so we compare across seven leading prefab platforms (Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, and Tuff Shed) plus site-built construction. That comparison happens before you sign anything. You can learn more about how we work on our ADU Builders in Redlands page.
Pricing & Estimates
How much does an ADU cost in Redlands?
ADU project costs in Redlands typically fall into three bands depending on size and approach: a garage conversion commonly lands in the lower range, a junior ADU or interior conversion sits in the middle, and a new detached unit is the largest investment. We don’t publish a single “average” price because the real number depends on site prep, utility runs, finish level, and whether you go prefab or site-built. We give line-item estimates, not lump sums, so you can see where the money goes. Call (855) 341-3461 for a free, itemized estimate on your specific lot.
Do you offer free estimates?
Yes, estimates are free. We walk your property, review lot constraints, and put together a written scope with pricing you can actually compare against other bids. There’s no charge and no obligation to move forward after we’ve talked.
Is it cheaper to repair or replace my garage to make it an ADU?
For most Redlands homes, converting an existing attached garage is cheaper than building a new detached unit, provided the structure is sound. The savings come from the foundation, roof, and three existing walls. We look at the slab, framing, and roof condition during the site visit. If the garage needs major structural work, a new detached build sometimes pencils out better, and we’ll tell you that plainly rather than push the conversion.
What’s included in your ADU estimate?
Our estimates break out the major cost centers so nothing hides in a single total. A typical estimate covers:
- Site prep, grading, and foundation
- Utility trenching and connections (water, sewer, electrical)
- The unit itself: prefab platform cost or site-built framing and materials
- James Hardie fiber-cement siding and exterior finishes where applicable
- Interior finishes, fixtures, and kitchen/bath components
- Permit and design/engineering fees
- Project management and final inspection walkthrough
If you want to see how this breaks down in practice, we walk through it on the home page. Call (855) 341-3461 and we’ll build the same breakdown for your property.
Do you require a deposit, and what payment methods do you accept?
Yes, projects typically start with a deposit, with the balance scheduled against milestones. We accept standard payment methods including check and major credit cards. We’ll spell out the draw schedule in your contract so you know exactly when each payment is due and what it pays for.
Service & Scheduling
How fast can you respond?
We return calls and inquiries the same business day, and we schedule site visits within a few days of your first call. For homeowners already in a project, we keep a single point of contact so you’re not chasing different trades. The fastest way to get moving is to call (855) 341-3461.
Do you offer emergency ADU service?
No, we don’t run an emergency or after-hours service line. ADU construction is planned work, not a same-day fix. What we do offer is steady project oversight, so problems get caught during the build rather than after. If you have an active project and something needs attention, your project contact is reachable during business hours.
How long does an ADU project take?
Timelines vary by approach: prefab units generally move faster on-site because the structure arrives built, while site-built and garage conversions take longer from framing through finishes. The biggest variable is usually permitting, not construction. We lay out a realistic schedule at the estimate stage and flag permit holds early. Here’s the general flow we follow on every project:
- Consultation and site visit. We walk the lot, review setbacks, and confirm what’s feasible.
- Platform comparison. We match your needs against the seven prefab platforms and site-built, then recommend.
- Design and engineering. Drawings and structural calcs prepared for submittal.
- Permitting. We submit to the city and track the review.
- Site prep and foundation. Grading, slab or footing work, utility trenching.
- Build or install. Prefab set and finish, or site-built framing through finishes.
- Final inspection and punch list. We walk the finished unit with you and close out every item.
Can you start my ADU project soon?
Start dates depend on our current schedule and how quickly your permits clear. We’ll give you an honest timeline up front rather than an optimistic one we can’t keep. Call (855) 341-3461 to check current availability for your address.
Licensing, Trust & Guarantees
Are you licensed and insured?
Yes, we’re a licensed and insured contractor. We’re happy to provide current licensing and certificate-of-insurance documentation before you sign anything. That’s standard practice on a project of this size, and you should expect it from any builder you hire.
Do you guarantee your work?
Yes, we stand behind our work with a written guarantee on our construction scope. Prefab components also carry the manufacturer’s own warranty, and James Hardie fiber-cement siding carries manufacturer coverage for the product itself. We’ll explain which warranty covers what so there’s no confusion down the road.
Do you use subcontractors, or is this your own crew?
We run the project as the single point of contact and oversee every phase from permit to punch-list. That’s the whole idea behind “Sentinel”: we stay on the job watching schedules, quality, and your investment, rather than handing you off after the contract is signed. You’ll always know who to call.
Why does the brand-agnostic approach matter?
It matters because a contractor who only sells one product line can’t give you a real comparison. We’re familiar with all seven leading prefab platforms plus site-built, so the recommendation is driven by your lot, your budget, and your timeline, not by what we happen to carry. That’s the honest-comparison part of how we work.
Specific ADU Services
Do you handle ADU design and permitting?
Yes, we handle design and permitting as part of the project. That includes drawings, engineering, submittal to the city, and tracking the review until approval. Because permitting is often the longest stretch, managing it in-house keeps your schedule from stalling. We’ll tell you what the city needs up front so the submittal comes back clean.
Do you handle garage conversion ADUs?
Yes, garage conversions are one of our most common Redlands projects. We assess the slab, framing, and roof first, then convert the space into a full living unit with its own kitchen and bath. If the existing structure is sound, this is often the most cost-effective path to a rentable unit. Call (855) 341-3461 to have us look at your garage.
Do you handle new detached ADUs?
Yes, we build new detached units both prefab and site-built. On a detached build, we compare the prefab platforms against stick-built construction on your exact lot, since slope, utility runs, and setbacks can favor one over the other. The right answer changes from property to property.
Do you handle junior ADUs and interior conversions?
Yes, we handle JADUs and interior conversions that fit within your existing home’s footprint. These tend to be the smallest and least site-intensive projects, which can make them a good fit if your yard is tight or your budget is more limited. We’ll confirm whether your home’s layout can support one before you commit.
Can you handle kitchen and bathroom remodeling too?
Yes, we do kitchen remodeling and bathroom remodeling alongside ADU work. If you’re adding a unit and also want to update your main house bath or kitchen, we can plan both under one project so you’re not juggling multiple contractors. One plan, one point of contact.
What areas do you serve?
We serve Redlands and the surrounding Inland Empire communities. Our home base and the bulk of our ADU work is centered on Redlands, but we regularly take on projects in neighboring cities. Call (855) 341-3461 with your address and we’ll confirm whether you’re in our service area.
Getting Started
What’s the first step?
The first step is a call and a free site visit. We’ll look at your property, talk through prefab versus site-built, and give you a line-item estimate. You don’t need to have decided anything yet. Call (855) 341-3461 and we’ll find a time that works.
Should I get more than one bid?
Yes, we encourage it. A six-figure property investment deserves comparison, and we’d rather you choose us because the numbers and the process made sense to you. Our job is to give you an honest comparison so you can decide with clear eyes.
What makes Sentinel ADU Builders different?
Two things: we’re brand-agnostic across seven prefab platforms plus site-built, and we stay on the job from permit to punch-list. That combination is rare in this market, where most builders either lock you into one product or hand you off after signing. We do the opposite on both counts.
Have a question we didn’t cover? Call Sentinel ADU Builders at (855) 341-3461.