Cover Garage Conversion ADU: The West Hollywood Owner’s Guide
Cover garage conversion ADU systems in West Hollywood typically run $185,000-$275,000 all-in, from permit set through final inspection, with most projects quoted at a single written price before any design work begins. We stock and coordinate Cover-compatible components, including panel systems, MEP rough-in kits, and structural connection hardware, with same-day assessment availability for failing units. Most West Hollywood owners discover a problem when the conditioned space stops holding temperature evenly, the electrical subpanel throws intermittent breakers, or the moisture barrier shows failure at the garage slab edge - all signs that a specific Cover subsystem has reached end of life.
Which Cover Models This Applies To
Cover’s garage conversion line breaks into three series: the original Cover Garage (2019-2022), the Cover Garage Plus (2022-2024), and the current Cover Studio system. The model badge lives on the interior side of the electrical chase panel, usually near the subpanel. Original Garage units carry a 4-digit serial starting with CG; Garage Plus uses CGP; Studio uses CSG. The critical compatibility gotcha in West Hollywood is the slab connection detail: original CG series used a 2-inch thermal break at the stem wall that Cover later revised to 4 inches for Title 24-2022 compliance. If your garage sits on a 1950s slab with no footing extension, the CG retrofit bracket won’t seat properly without a stem-wall modification that adds $8,000-$14,000 to the scope.
We specify OEM Cover panels and connection hardware where the warranty transfer matters, but source equivalent ZIP System R-sheathing and Rockwool Comfortboard for thermal retrofits when the original Cover insulation core has degraded. The decision point is usually moisture: if the OSB face shows swelling at the bottom course, OEM replacement is the only path that preserves the Cover weatherization warranty. For electrical and mechanical components - mini-split line sets, ERV ducting, subpanel bus bars - we use spec-matched aftermarket from Mitsubishi, Panasonic, and Siemens that meets the same UL listings at lower replacement cost.
Signs Your Cover Garage Conversion ADU Is Failing
- Uneven temperature zones between the original house and the converted unit. The Cover thermal envelope relies on continuous exterior insulation; when the taped seams at the roof-to-wall junction fail, conditioned air bleeds into the unconditioned garage attic cavity. In West Hollywood’s Santa Monica-adjacent microclimate, morning marine layer moisture accelerates tape adhesive breakdown, typically visible as bubbling at the ZIP panel seams within 6-8 years of install.
- Intermittent breaker trips on the ADU subpanel, especially under HVAC load. Cover’s original spec used 60-amp feeder breakers for units under 400 square feet, but West Hollywood’s summer inland heat spikes push mini-split compressors past continuous load calculations. The breaker isn’t failing; it’s correctly protecting undersized conductors that were compliant at permitting but marginal in practice.
- Musty odor or visible staining at the slab perimeter. The Cover Garage series applied a fluid-applied membrane directly to existing concrete; where the slab lacked a vapor barrier (common in 1940s-1960s West Hollywood construction), moisture wicks upward and degrades the bottom plate gasket. This isn’t a leak - it’s capillary action that the original scope didn’t address because the slab wasn’t exposed.
- ERV unit runs continuously but humidity stays elevated. Cover spec’d the Panasonic FV-04VE1 for units under 500 square feet, but the filter housing on early installs used a proprietary rectangular cartridge that Panasonic discontinued in 2021. Owners who substituted standard MERV-13 media without adapting the housing created static pressure that burns out the ECM motor in 18-24 months.
- Door and window operation gets stiff seasonally. Cover’s aluminum-clad opening frames expand differently than the ZIP sheathing substrate; in West Hollywood’s wide diurnal temperature swings, the fasteners back out incrementally. The frame isn’t warped - the attachment schedule was designed for milder climates, and the cumulative thermal cycling loosens the structural screws at the jamb.
Before
AfterReplacement Cost & What’s Included
| Component/System | West Hollywood Range | What’s Driving It |
|---|---|---|
| Thermal envelope remediation (panel replacement, taping, insulation) | $24,000-$42,000 | Extent of moisture damage; whether stem wall needs extension for Title 24 compliance |
| Electrical subpanel and feeder upgrade (100-amp service) | $8,500-$14,000 | Distance from main panel; trenching requirements if underground |
| Slab vapor barrier retrofit with interior drain mat | $6,000-$11,000 | Slab thickness; need for perimeter French drain if exterior grade is high |
| ERV replacement with adapted filter housing | $3,200-$5,400 | Unit capacity; duct modification for current Panasonic spec |
| Opening frame re-attachment with thermally broken fasteners | $4,500-$7,500 | Number of openings; stucco repair scope |
These are installed prices, inclusive of parts, labor, permit expediting, and the documented photo record delivered after each site visit. Under Haven Standard Clause 1, the written price you receive before work starts is the price you pay; no line item changes without a signed change order. Our 365-Day Done Right Promise covers installation workmanship and component function - if the thermal envelope doesn’t perform to the specified R-value or the electrical passes inspection but fails under load, we make it right.
DIY or Call Us?
There’s a safe middle ground and a hard stop. Homeowners can verify the model badge, photograph any visible panel damage, and check the subpanel breaker rating against the mini-split nameplate - that’s useful information that speeds our first visit. What you should not attempt: removing Cover panels to inspect the membrane (the ZIP fastening pattern is structural, not cosmetic, and improper re-sequencing compromises the weatherization warranty), or working inside the electrical chase (the subpanel is fed by a live 240V feeder that remains energized at the main even with the breaker off).
We’ve rebuilt three West Hollywood Cover conversions this year where the owner started with a utility knife and a YouTube video and ended with a permit violation and a $30,000 scope correction. The document is the promise. Everything else is a conversation. Call (213) 329-7167 and we’ll schedule a free assessment with a written scope and price before any work is authorized.
FAQs
The thermal envelope typically performs 15-20 years if the original install included proper membrane detailing at the slab; electrical and mechanical components average 10-12 years with the inland heat load West Hollywood sees 4-5 months annually. Call (213) 329-7167 for a condition assessment - estimates are free.
Electrical and mechanical components can often be repaired - a breaker upgrade, an ERV motor replacement, a duct reseal. The thermal envelope is generally replace-only once moisture has compromised the ZIP panel OSB face or the Rockwool has absorbed vapor. We document what’s repairable and what isn’t in the written scope, with photo evidence. Call (213) 329-7167 for an exact quote - estimates are free.
A thermal envelope replacement runs 4-6 weeks of construction after permit issuance; electrical or mechanical-only work is typically 3-5 days. West Hollywood’s planning department currently processes garage conversion ADU permits in 8-12 weeks for standard review, which we expedite as part of our single-contract scope. Call (213) 329-7167 for current timeline specifics - estimates are free.
We maintain Cover-compatible structural hardware, ZIP System sheathing in 5/8-inch and 7/16-inch thicknesses, and Panasonic ERV units in our West Hollywood staging area. OEM Cover panels ship from their Bay Area facility on a 2-3 week lead time, which we coordinate to arrive just-in-time for the demolition phase. Call (213) 329-7167 to confirm current availability for your specific model - estimates are free.
Ellery ADU Studio West Hollywood is an independent design-build studio, not affiliated with Cover. We also specify and coordinate prefab and modular systems from Abodu and Dvele under the same single-contract, written-price model.
Written by Nadia Ellery, Owner, Ellery ADU Studio West Hollywood at Ellery ADU Studio West Hollywood, serving West Hollywood and nearby areas.