Why San Bernardino Homeowners Choose Cover ADU
We provide San Bernardino Cover service for homeowners for homeowners who need factory-trained assembly, site correction, and finish-out of Cover’s panelized backyard units. Our crew has assembled and finished dozens of Cover systems across the Inland Empire, so we know the real interfaces - foundation tolerances, utility stubs, and finish schedules - better than a generic installer who treats every prefab brand the same. Call (909) 359-6463 to schedule your free estimate.
Cover’s panelized system arrives flat-packed with factory-cut wall panels, roof assemblies, and pre-wired electrical chases. In San Bernardino, that system meets a local reality: post-WWII lots with alley-accessed garages, slab-on-grade foundations poured decades before anyone thought about ADU tolerances, and wind exposure along the Cajon Pass corridor that the factory manual mentions but doesn’t solve in the field. We’re not affiliated with or authorized by Cover. We are an independent studio that stands behind the work as your advocate, not the manufacturer’s representative. That independence matters when the slab is out of level or the city inspector flags a bracing detail the kit didn’t anticipate.
Nadia Ellery, our owner, still references a Cover One we finished three blocks from Seccombe Lake when clients ask what a completed product actually looks like. She’ll tell you the lot dimensions and give you a real number - not a range so wide it’s useless.
Why Trust Ellery ADU Studio San Bernardino for Your Cover ADU?
Cover’s system is specific. The wall panels interlock with proprietary connectors. The electrical chase runs at a fixed height. The floor system assumes a slab or pier elevation within 1/8 inch across the full footprint. Generic contractors who’ve built stick-frame ADUs often miss these constraints until the panels are on the truck and the slab won’t accept them.
We’ve assembled Cover One 1-bedroom units, Cover Two 2-bedroom layouts, Cover Studio open-plan configurations, and Cover Garage Conversion kits across San Bernardino County. Nadia studied architectural drafting and construction technology at Santa Monica College, then spent a decade learning why some plan sets get approved in four weeks and others sit in queue for four months. That training shows up in our ADU Design & Permitting services for Cover projects, where we document exactly which municipal code section covers each phase - seismic bracing, fire separation, utility lateral sizing.
We use Cover’s OEM panel connectors, sealants, and trim kits for the structural envelope. For electrical, plumbing, and HVAC components, we source high-quality aftermarket parts locally. This split keeps the kit warrantable where the manufacturer’s warranty applies while avoiding factory lead times on commodity items. Every project is quoted with a written price before any work begins, per Haven Standard Clause 1. No “call for pricing.” No change orders after signing.
Our crews are background-checked and uniformed. The license number appears on every page. We pull permits, pass inspections, and deliver a documented photo record on every visit. Under Clause 5 (No Surprises), the scope is locked at signing.
Common Cover ADU Problems We Fix in San Bernardino
- Out-of-tolerance slab or pier elevations. Cover’s panelized floor system requires a level base within 1/8 inch. On a recent Cover One in San Bernardino, the previous contractor had poured the slab 1.5 inches out of level and left the electrical stub at the wrong end of the footprint. The factory panels wouldn’t seat without racking. We re-shot the pier elevations, added shims and a new anchor layout engineered for the site’s wind exposure, and rerouted the service inside the panel chase with a new subpanel. The unit passed final inspection with the panel joints plumb.
- Utility stub-ups landed before the factory panel layout was finalized. This happens when the general contractor runs electrical, plumbing, and gas before the Cover shop drawings are approved. The stubs end up inside panel cavities where they don’t belong, or outside them where they’re exposed. We map the actual stub locations against the approved panel layout, then reroute inside the chase or add surface raceways where the city allows. In San Bernardino, the building department will flag exposed utilities on a prefab unit.
- Roof panel seam debris accumulation. Cover modules use ridge caps over panelized roof seams. In the Cajon Pass corridor, high winds drive dust and debris into these joints. Over a season or two, the buildup traps moisture. We’ve found intrusion at the ridge caps on three Cover units in northern San Bernardino neighborhoods, all within two years of assembly. We clean the seams, replace degraded sealant with OEM-compatible material rated for the temperature swings here - summer highs over 108°F, occasional hard freezes - and add a maintenance note to the owner’s packet.
- Hurricane-tie and anchor-bolt spacing mismatches. Cover’s garage-conversion kits include prescriptive bracing details that work in lower wind zones. San Bernardino’s exposure, combined with seismic requirements from proximity to the San Andreas Fault, often demands closer spacing or higher-capacity hardware. The city building department may require a licensed engineer’s letter for the field fix. We engineer and document these modifications as part of our standard scope, not as a change order.
- Finish-schedule gaps after panel assembly. Cover ships a weathered-in shell. Interior drywall, flooring, cabinetry, and fixtures are owner or contractor scope. We see units where the shell went up fast but the finish crew didn’t understand the panel joint locations, electrical chase access points, or HVAC mini-split mounting constraints. We finish what others start, matching the factory tolerances so the final product doesn’t look like two different buildings stitched together.
Cover Parts & Our Repair-vs-Replace Approach
On a Cover ADU, “repair versus replace” is rarely the question. The shell is either salvageable or it isn’t. We tell owners plainly.
When the structural envelope is sound - panels square, connectors intact, no moisture degradation - we rescue the shell and correct the site or systems issues. That’s most of our Cover work in San Bernardino. When a panel has delaminated, a connector slot has stripped, or racking has stressed the assembly beyond recovery, we specify a panel swap and engineer the replacement into the existing layout.
We stock Cover-compatible panel connectors, seam sealants, and trim kits at our San Bernardino warehouse. For electrical, plumbing, and HVAC, we source from local suppliers with same-day or next-day availability. This keeps timelines short without waiting on factory shipments for standard components.
Call (909) 359-6463 for an exact quote on your Cover project. Estimates are free, and the price is written before any work starts.
Our Cover Service Process - Step by Step
- 1
Site assessment. We measure slab or pier elevations, locate existing utilities, photograph conditions, and check San Bernardino’s ADU ordinance overlays - including whether your parcel falls in a fault-proximity study zone requiring a geotechnical report. You receive a documented photo record and a written scope with a fixed price.
- 2
Permit and engineering. We produce the permit set, including structural calculations for seismic and wind bracing if the kit’s prescriptive details don’t match local requirements. The set cites the specific municipal code sections that apply to your project.
- 3
Foundation correction or prep. For Cover’s panelized floor system, we bring the base within tolerance - grinding, shimming, or pouring new piers as needed. We don’t assemble on a slab that won’t accept the panels.
- 4
Panel assembly and envelope sealing. We install wall and roof panels per Cover’s sequence, using OEM connectors and sealants, with field modifications only where engineered and documented. Every seam is photographed before closure.
- 5
Systems rough-in and finish-out. Electrical, plumbing, HVAC, and fixtures are installed inside the panel chases or with surface routing where approved. We use quality aftermarket components with local warranty support.
- 6
Testing, inspection, and handoff. All systems are tested under load. We walk the final inspection with the city inspector. You receive the documented photo record, as-built drawings, and our 365-Day Done Right Promise in writing.
Cover Products We Service & Install in San Bernardino
We work across Cover’s full residential lineup:
- Cover One - 1-bedroom backyard ADU, typically 400-550 sq ft
- Cover Two - 2-bedroom backyard ADU, typically 600-750 sq ft
- Cover Studio - open-plan studio ADU, typically 300-400 sq ft
- Cover Garage Conversion kit - panelized system for existing detached garages, the most common Cover project type in San Bernardino’s alley-access neighborhoods
We stock OEM panel connectors, sealants, and trim kits locally for our Colton Cover service and surrounding areas. For garage conversion projects, we also keep seismic and wind-bracing hardware sized for San Bernardino’s specific requirements, since the kit’s prescriptive details often need field augmentation.
We Also Service These Brands
Our prefab fluency extends across Abodu, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie systems. We’re not dependent on any single manufacturer. That breadth means we can recommend the right system for your lot and budget, or service what you already own without steering you toward a brand that pays us.
FAQs - Cover ADU Service in San Bernardino
Does a Cover ADU need a custom foundation in San Bernardino?
Cover’s panelized floor system needs a level base within 1/8 inch, which existing slabs rarely provide. In San Bernardino, parcels near the mountain front - Verdemont, the Highland border - may also require a geotechnical engineer’s report due to fault-proximity study zones. We assess both conditions in our initial site visit and include any needed engineering in the written scope. Call (909) 359-6463 to schedule.
Can you install a Cover ADU on a lot with an existing detached garage?
Yes. The Cover Garage Conversion kit is designed for this, and it’s the most common Cover project we see in San Bernardino’s post-WWII neighborhoods with alley access. The existing garage slab usually needs elevation correction, and the electrical service often requires upgrade from 60-100 amp to 200 amp. We handle both as part of our single-contract scope.
How do you handle Title 24 energy compliance for a Cover prefab?
Cover ships with insulation and window specs that meet or approach Title 24 requirements. We verify the specific package against San Bernardino’s climate zone - inland valley, not coastal - and supplement if needed. HVAC sizing accounts for the 108°F summer highs and occasional hard freezes here, not the milder conditions the same unit might see in Los Angeles.
What permits are needed for a Cover ADU in San Bernardino?
Standard ADU permits: building, electrical, plumbing, mechanical. In San Bernardino, the building department may add seismic bracing review and, for northern parcels, a geotechnical clearance. We produce the full permit set and pull all permits as part of our scope. You don’t coordinate with the city - we do.
Can you modify a Cover ADU layout to add a bathroom or partition?
Within limits. Cover’s panelized system has fixed chase locations and structural bays. We can add non-load-bearing partitions, relocate fixtures within the chase system, and sometimes expand the footprint with field-engineered connections. We won’t modify the structural envelope without engineering that preserves the shell’s integrity. We’ll tell you what’s possible and what isn’t.
Is Ellery ADU Studio San Bernardino authorized by Cover?
No. We are an independent service provider with no affiliation or authorization from Cover. That independence lets us advocate for you when site conditions or code requirements don’t match the factory manual. We use OEM parts for the structural envelope to maintain warranty coverage where it applies, but our loyalty is to the finished product, not the manufacturer’s preferences.
Do you use genuine Cover/OEM parts?
For the structural envelope - panel connectors, sealants, trim kits - yes. These maintain the manufacturer’s warranty where it applies and ensure proper fit. For electrical, plumbing, and HVAC components, we use quality aftermarket parts with local availability and warranty support. This split saves time without compromising function.
How long does Cover service take?
Site assessment to permit approval typically runs 6-10 weeks in San Bernardino, depending on whether geotechnical review is required. Assembly of the shell takes 2-5 days for a Cover Studio or One, 5-10 days for a Two or garage conversion with corrections. Finish-out adds 4-8 weeks. We give a specific timeline in our written scope, not a guess.
What Cover models/series do you cover?
Cover One, Cover Two, Cover Studio, and Cover Garage Conversion kits. We’ve assembled and finished all four across San Bernardino and the Inland Empire, including Cover in Rialto.
Will service void my Cover warranty?
Using an independent provider does not automatically void a manufacturer’s warranty. Using non-OEM parts for structural components can. We use Cover’s OEM connectors and sealants for envelope work, document everything, and flag any warranty limitations in writing before we start. You know exactly where you stand.
How much does Cover ADU service cost in San Bernardino?
Site assessment and correction for a Cover shell typically runs $15,000-$35,000 depending on slab condition and utility reroutes. Full assembly and finish-out of a Cover One or Studio generally falls between $180,000 and $280,000 all-in, drawings through final inspection. Garage conversions with existing structure start lower; new detached units on challenging lots run higher. Every project gets a written price before work starts, per Haven Standard Clause 1. Call (909) 359-6463 for your exact quote - estimates are free.
Book Your Cover Service in San Bernardino, CA
Call (909) 359-6463 to schedule your free site assessment. We’ll measure your slab, check your utilities, and give you a written price for the scope - not a range so wide it’s useless. Every project includes a documented photo record, permit coordination, and our 365-Day Done Right Promise in writing. A live person answers calls 24/7.
Written by Nadia Ellery, Owner at Ellery ADU Studio San Bernardino, serving San Bernardino since 2015.