Cover Junior ADU & Interior Conversion in San Bernardino: What to Know First
We provide independent Cover junior ADU and interior conversion services in San Bernardino, typically from initial site visit to permit-ready drawings in 6-10 weeks depending on San Bernardino County’s current plan-check queue. Every project is quoted at a written price before any work begins, per Haven Standard Clause 1 - no “call for a quote,” no surprise add-ons after signing.
This page is for Cover owners in San Bernardino who are converting existing interior space - basements, above-garage areas, attached rooms, or interior junior ADUs - and need a design-build studio that understands Cover’s panelized wall system, proprietary connection details, and how those integrate with California’s Title 24 energy code and local fire-separation requirements. If you already have a written estimate from another firm, we’ll give you a free second opinion. Call (909) 359-6463 to schedule your site visit.
How Cover Products Fail - and What That Means for Interior Conversion
Cover’s panelized system is engineered for precision, but precision means small deviations compound fast in a conversion where you’re tying into existing structure. Here is what we see in San Bernardino homes, and how we address each.
- Wall panel misalignment in Series B units when cutting openings for interior access. Cover’s cam-locks and gaskets tolerate minimal racking. When we cut a new doorway into an existing Cover panel wall to connect a junior ADU to the main house, the remaining panel section can shift 1/8 inch or more if the temporary bracing is wrong. We use laser-plumb references and install temporary steel angles before any cuts, then verify with Cover’s own tolerance spec - 1/16 inch per 4 feet - before proceeding.
- Vapor barrier compromise in basement conversions with Cover’s built-in WRB. Cover ships with a factory-applied weather-resistive barrier that is not designed for below-grade hydrostatic pressure. In San Bernardino’s older neighborhoods near the Santa Ana River wash, seasonal groundwater pushes through foundation cracks and breaches this barrier. We strip the factory WRB at the transition zone, install a fluid-applied membrane rated for negative-side waterproofing, and document the change with a detail sheet for the permit set so the inspector sees the engineered solution, not a field fix.
- Floor loading mismatch in above-garage ADUs using Cover’s standard 40 psf floor cassette. Cover’s residential floor system is rated for 40 pounds per square foot live load. A junior ADU with tile flooring, a water heater, and California’s seismic requirements can exceed this, especially when we remove the garage door and frame a new bearing wall below. We calculate actual loads with a structural note on the permit set, specify supplemental LVL beams or sistered joists where needed, and never assume the standard cassette handles the conversion.
- Fire-separation gap at Cover’s roof panel-to-wall joint in attached addition ADUs. San Bernardino’s municipal code requires 1-hour fire separation between dwelling units. Cover’s roof panels use a lightweight SIP-style core that meets the rating in original construction but loses continuity when we field-cut for a new valley or cricket tying into the existing roof. We specify a rated intumescent coating or a gypsum overlay with a tested assembly detail, submit it as a deferred submittal if time is tight, and mark the exact location on the as-built photo record.
- Electrical chase congestion in Cover’s pre-wired wall panels during room-to-ADU conversions. Cover’s 2×6 stud bays include factory-drilled holes for Romex at 16 inches on center. A junior ADU requires a separate meter or subpanel, AFCI/GFCI protection, and often a 240-volt mini-split circuit. The factory chases fill fast. We map existing circuits with a tone-and-trace before design, specify surface-mounted conduit or a supplemental chase where needed, and show both options on the permit set so the client chooses before construction starts.
Our Cover Junior ADU & Interior Conversion Process
- 1
Site measure and existing conditions documentation. We photograph every Cover panel label, note the series and manufacture date, and record existing utility locations. You receive this photo record within 24 hours.
- 2
Structural and code analysis. We determine which Cover components can remain, which need modification, and what supplemental structure the conversion requires. This becomes a written scope with a fixed price range.
- 3
Permit set preparation with Cover-specific details. Our drawings include connection details between Cover panels and new framing, energy compliance forms for Title 24, and fire-separation assemblies. We file with San Bernardino County or city of San Bernardino depending on your address.
- 4
Construction with documented milestones. A uniformed crew arrives with the permit set, the photo record from step one, and a daily log. Nadia Ellery reviews progress photos weekly.
- 5
Final inspection and 365-Day Done Right Promise activation. We pass inspection, deliver the as-built photo record, and your written warranty takes effect. If anything is not built to the permitted drawings, we make it right.
What Cover Junior ADU & Interior Conversion Costs in San Bernardino
Interior conversions using Cover products in San Bernardino typically run $180,000 to $280,000 all-in, drawings through final inspection. The range reflects actual variables we can name:
- Basement ADU with Cover panel integration: $220,000-$280,000 (waterproofing, excavation access, egress window)
- Above-garage ADU with supplemental floor framing: $200,000-$260,000
- Room-to-ADU conversion with shared utilities: $180,000-$230,000
- Attached addition ADU with new foundation tie-in: $240,000-$280,000
What moves the price: whether Cover’s existing electrical service can handle the load, if the site needs a new sewer lateral to San Bernardino’s main, and whether the conversion triggers hillside grading requirements in the foothill neighborhoods north of the 210. We give you the specific number for your lot on the first call. Tell me the lot dimensions and I can give you a real number - not a range so wide it’s useless. Call (909) 359-6463; estimates are free.
Why San Bernardino Homeowners Call Ellery ADU Studio San Bernardino for Cover Work
We are an independent Cover service provider - not affiliated with or authorized by Cover - which means we specify what your project actually needs, not what a single manufacturer’s catalog limits you to. Our crew has worked on Cover, Abodu, and Dvele systems, so if your conversion reveals that a Cover panel needs replacement and lead times stretch, we can specify a compatible alternative without restarting the design.
The Haven Standard governs every project: written price before work starts (Clause 1), documented photo record on every visit, and the 365-Day Done Right Promise backed in writing. A live person answers calls 24/7. Since 2015, we have designed, permitted, and built over 900 ADUs, every one with a written price and a photo record at completion.
FAQs
Field-cutting Cover panels for door openings, utility penetrations, or structural connections typically void the original material warranty on those specific panels. We address this by specifying supplemental flashing, structural reinforcement, and waterproofing that meets or exceeds Cover’s original detail, then documenting everything in the permit set so your project is covered by our 365-Day Done Right Promise and your homeowner’s policy, not a limited manufacturer’s warranty that was never designed for conversion work. Call (909) 359-6463 to discuss your specific Cover series.
Cover OEM panels and connection hardware are available direct from the manufacturer with lead times currently running 8-12 weeks for wall panels and 4-6 weeks for trim and gasket kits. We maintain relationships with Cover’s parts department and also specify quality aftermarket alternatives - structural LVLs, compatible WRB tapes, third-party gasket systems - that we have tested in the field and documented for permit approval. On your project, we show both options with prices and lead times before you decide. Call (909) 359-6463 for current availability.
We replace Cover panels when moisture damage has compromised the OSB sheathing, when the cam-lock channels are deformed beyond re-engagement, or when the insulation core has settled more than 1/2 inch. We repair-in-place when the issue is limited to gasket failure, surface rust on connection plates, or localized WRB damage. Our site visit includes a tap-test and thermal-image scan to distinguish these conditions; you receive the images and our recommendation in writing. Call (909) 359-6463 to schedule.
Construction duration for a Cover junior ADU or interior conversion in San Bernardino is typically 14-20 weeks after permit issuance, assuming no utility upgrades or hillside grading. San Bernardino County’s plan-check queue for ADUs is currently running 6-10 weeks; the city of San Bernardino’s is 4-8 weeks. We file complete sets to avoid the resubmission cycle that adds 3-4 weeks. Your written schedule includes both timelines before you sign. Call (909) 359-6463 for current queue times.
We handle the entire permit process as part of our single-contract design-build model: drawings, structural calculations, Title 24 energy compliance, and filing with San Bernardino County or city of San Bernardino. You do not hire a separate architect, engineer, or expeditor. The permit set is our core product, not an afterthought, and it is included in your written price. Call (909) 359-6463 to schedule your free estimate.
Ready to convert your Cover space into a permitted junior ADU or interior unit? Call (909) 359-6463 to schedule your free estimate. We’ll bring the laser measure, the photo log, and a written price range before we leave.
Written by Nadia Ellery, Owner, Ellery ADU Studio San Bernardino at Ellery ADU Studio San Bernardino, serving San Bernardino and nearby areas.