Cover Junior ADU & Interior Conversion in Los Angeles: What to Know First
Cover detached units and interior conversions in Los Angeles are permitted through LADBS under the city’s ADU ordinance, and we design, permit, and build them as a single contract at one written price. A typical Cover interior JADU or attached conversion takes 4 to 7 months from signed drawings to final inspection, depending on utility scope and whether the existing structure needs seismic or foundation work. Every project gets a written price before any work starts, per Haven Standard Clause 1.
This page is for Los Angeles homeowners who already own a Cover unit and want to convert interior space into a junior ADU, or who are specifying a Cover system for an attached addition or garage-top build. If you have a written estimate from another firm, bring it in. We’ll give you a free second opinion and a line-item comparison. Call (971) 497-2402.
How Cover Products Fail - and How We Fix Them
- Cover S series wall panel delamination at interior corner joints. Los Angeles humidity swings plus the thermal cycling between conditioned JADU space and unconditioned garage zones cause the panel seams at interior corners to separate. We pull the panel, inspect the framing behind it, re-flash the seam, and replace the panel with the same Cover-spec material so the warranty stays intact.
- Cover unit roof membrane lifting at the parapet on garage-top installations. We see this on units in Silver Lake and Echo Park where wind-driven rain hits the parapet at an angle. The factory detail is adequate for most conditions, but LA’s Santa Ana winds expose flashings that weren’t compressed correctly during set. We remove the membrane, re-bed the termination bar, and re-secure with the OEM fastener schedule.
- Interior JADU conversions with inadequate sound separation at the party wall. Cover units ship with a standard wall assembly. When a homeowner converts an attached garage or basement into a JADU, the shared wall often doesn’t meet LA’s STC-50 requirement for ADUs attached to a primary residence. We add a second layer of 5/8-inch drywall on resilient channel and re-insulate the cavity to bring the assembly into compliance before the inspector reviews it.
- Cover plumbing rough-in offset from the JADU kitchen location. On several Cover models, the factory plumbing stub-outs for the kitchenette sit 4 to 6 inches off from where a typical LA JADU layout places the sink. This shows up during framing inspection when the inspector measures against the approved plan set. We re-route the supply and drain lines within the wall cavity and update the drawings so the permit set matches the as-built exactly.
- Electrical panel sizing on older Los Angeles homes. A 1950s or 1960s home in Mid-City or West Adams often has a 100-amp panel. A Cover JADU with a mini-split, electric water heater, and induction cooktop pushes that past load. We specify a 200-amp service upgrade as part of the permit set before the Cover unit arrives, so the panel work and the unit install don’t collide on the same inspection day.
Our Cover Junior ADU & Interior Conversion Process
- 1
Site walk and existing-conditions report. We measure the space, document the existing structure with photos, and check the panel, slab, and roof condition. You receive a written record of what we found, not a verbal summary.
- 2
Permit set drawings. Our drafting team produces a permit-ready set through LADBS. Nadia Ellery reviews every drawing before submittal. The drawing either satisfies the inspector or it doesn’t. Let’s make sure it does.
- 3
Written price and scope. You get a single written price covering design, permits, and construction, locked at signing under Haven Standard Clause 5. No door-side upsells.
- 4
Construction and coordination. We handle the Cover unit delivery, any crane or set work, utility tie-ins, and all finish work. One contract, one responsible party.
- 5
Inspections and closeout. We schedule and pass every inspection, then hand you a documented photo record of the completed work and the written 365-Day Done Right Promise.
What Cover Junior ADU & Interior Conversion Costs in Los Angeles
Interior JADU conversions from an existing attached garage or basement typically run $95,000 to $155,000 all-in, drawings through final inspection. A Cover garage-top ADU above an existing garage runs $180,000 to $260,000 depending on whether the garage needs structural reinforcement. Coordinating a Cover detached unit with site utilities and an interior conversion adds $15,000 to $40,000 in site work on a typical LA lot.
- Permit set and LADBS fees: $6,000 to $14,000
- Interior demolition and framing: $18,000 to $35,000
- Plumbing, electrical, and HVAC tie-ins: $22,000 to $45,000
- Cover unit coordination and set work: $8,000 to $22,000
- Finishes, fixtures, and appliances: $25,000 to $50,000
What moves the price: panel upgrades, foundation work under an existing garage, sewer line replacement, and whether the city requires a fire sprinkler system. Every quote is a written price before work starts. Call (971) 497-2402 to schedule a site walk and get your number in writing.
Why Los Angeles Homeowners Call Ellery ADU Studio for Cover Work
We’ve designed, permitted, and built more than 900 ADUs since 2015 across Los Angeles, and every one of them started with a written price and ended with a documented photo record. As an independent Cover service provider, we’re not tied to the manufacturer’s timeline or their preferred installer list. We specify and coordinate Cover, Abodu, and Dvele systems within the same single contract, which means you’re never stuck waiting on a factory rep to answer a question our crew can answer on site.
Our technicians are background-checked and uniformed. Our license number appears on every page we hand you. And if the finished conversion doesn’t match the permitted drawings, we make it right under the 365-Day Done Right Promise, in writing, before the project starts.
FAQs
No, as long as the conversion work is permitted and doesn’t alter Cover’s structural components. We keep all structural work within the original factory envelope and document every step so your warranty file stays clean.
LADBS ADU plan check typically takes 30 to 60 days for interior conversions when the permit set is complete. Our drawing sets go through first-time approval, which means no resubmittal cycle and no stalled timeline.
Yes. We source Cover-spec panel stock directly and keep common trim profiles in our Los Angeles warehouse. Repairs blend with the factory finish rather than reading as a patch.
No. The drawings, the permit set, and the construction are one contract with us. There is no designer-versus-builder gap, because the same firm produces both.
No. Under Haven Standard Clause 5, the scope and price are locked at signing. The only changes come from a written change order that you approve before any additional work begins. Call (971) 497-2402 for a written quote.
Written by Nadia Ellery, Principal, Ellery ADU Studio at Ellery ADU Studio, serving Los Angeles and nearby areas.