Garage Conversion ADU in Calabasas - One Fixed Price, Permits Handled

Fast, Reliable Garage Conversion ADU Across Calabasas

A garage conversion ADU in Calabasas typically runs $95,000-$175,000 all-in, from measured drawings through final inspection, and most projects take 6-10 months once HOA architectural review begins. If you’re in The Oaks, Calabasas Park Estates, or Mountain View Estates, that timeline includes mandatory HOA design committee approval before the city will even accept your permit application - a step many contractors skip until it’s too late. Call (424) 395-4555 to schedule your free estimate. Our Garage Conversion ADU team coordinates dispatch from our Los Angeles office, with crews serving Calabasas properties directly.

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Why Ellery ADU Studio Thousand Oaks Is Calabasas’s Preferred Garage Conversion ADU Company

We’ve designed, permitted, and built ADUs across Calabasas since 2015 - the year California’s ADU laws fundamentally shifted - and our 900+ completed projects include dozens inside gated communities where HOA overlays complicate what looks like a straightforward garage conversion. Nadia Ellery, our founder, structured Ellery as a design-build studio precisely because the designer-versus-builder blame gap destroys most ADU projects in cities like Calabasas, where one misstep with the architectural committee can cost four months.

Our Calabasas clients receive a written price before any work starts, per Haven Standard Clause 1. Not an estimate. A price. We also document every site visit with dated photos - what we found, not what we felt - so there’s evidence of existing conditions if an allowance triggers during construction. Live person answers calls 24/7, and we offer a Free Second Opinion on any written estimate already in hand from another firm.

Response time to Calabasas is typically next-day for initial site visits, with scheduling coordinated from our Los Angeles office. We know the difference between Calabasas Park Estates’ Mediterranean design guidelines and The Oaks’ stricter roofline-matching requirements. That local fluency means fewer redesigns, faster HOA approvals, and no surprises priced after walls are open.

Our Garage Conversion ADU Services in Calabasas

Attached Garage Conversion

In Calabasas, attached garage conversions face a constraint almost nowhere else: HOA CC&Rs in gated communities frequently cap total enclosed garage bays and forbid eliminating covered parking entirely. AB 3182 prevents HOAs from banning ADUs outright, but the architectural committee can force you to preserve one vehicle bay or screen the unit from street view. We address this in our pre-construction inspection by pulling the full CC&R packet and the HOA’s design guidelines before we draw a single line. In The Oaks, we’ve learned that preserving a single garage bay often means designing a partial conversion with a fire-rated partition - ignition-resistant assembly per Chapter 7A, HOA-approved finish - rather than framing over the entire door opening. A typical attached garage conversion in Calabasas runs $95,000-$140,000 all-in.

Detached Garage Conversion

Detached garages in Calabasas sit on larger lots - often 10,000-25,000 square feet - which makes physical siting easier, but HOA setback overlays and design covenants frequently override state minimums. We’ve seen Mountain View Estates push a detached garage ADU to a less-than-ideal corner of the parcel because the original covenant required a 25-foot side setback where state law allows 4 feet. Our permit set includes a full setback analysis against both city code and recorded covenants before submission. Detached conversions in Calabasas typically cost $110,000-$175,000, with fire-zone construction and longer utility runs driving the upper end.

Carport Conversion

Carport conversions are less common in Calabasas’s 1980s-1990s housing stock, but they appear in some Calabasas Park Estates phases and on older hillside lots in Topanga-adjacent areas. The challenge: carports lack the four-sided enclosure that defines a garage, so we’re often building two new walls and a complete roof assembly rather than modifying existing structure. In the VHFHZ, that new construction must meet Chapter 7A from the ground up - ember-resistant vents, non-combustible or ignition-resistant cladding, fire-rated roof. We specify James Hardie siding assemblies and custom-matched stucco systems that satisfy both the fire inspector and the HOA design committee. Carport conversions in Calabasas generally fall between $85,000-$130,000.

Garage Partition & Bathroom Add

This is where Calabasas projects most often surprise homeowners. The 1980s-era garage slab and stem wall frequently lack a moisture barrier or proper footing depth for a bathroom wet wall. We’ve opened walls in Calabasas Park Estates to find the slab poured directly on grade with no vapor barrier, and the stem wall too shallow to carry a toilet flange rough-in without underpinning. Our pre-construction inspection tests for this specifically. We write allowances into the contract - slab cutting and waterproofing, stem wall extension, or full perimeter drainage if needed - and price any surprise in writing before demolition. A garage partition with bathroom add in Calabasas typically runs $105,000-$155,000.

Garage JADU

A Junior ADU - smaller, owner-occupied, no separate utility meter required - can fit where a full ADU won’t. In Calabasas, garage JADUs work well when the HOA limits total square footage of accessory structures or when the existing electrical service can’t support a full second dwelling unit. The owner-occupancy requirement means this isn’t for everyone, but for homeowners who plan to stay in the main house, a garage JADU offers rental income without the full compliance burden. Calabasas garage JADUs typically cost $75,000-$115,000.

Trusted Brands We Service in Calabasas

Ellery specifies and coordinates prefab and modular systems from Abodu, Cover, and Dvele, though in Calabasas’s HOA-governed environment, prefab units face significant hurdles. The Oaks and Mountain View Estates architectural committees routinely reject factory-built modules that don’t match the primary residence’s roof pitch, window trim profile, and stucco color exactly. For Calabasas clients where HOA design compatibility is paramount, we more often specify James Hardie ignition-resistant cladding systems and custom site-built framing that we can match precisely to existing conditions. When prefab does work - typically on non-HOA hillside lots or where the committee has approved contemporary designs - we coordinate Abodu or Cover units within the same single contract, with the same written price guarantee and documented photo record.

Common Garage Conversion ADU Problems We See in Calabasas Homes

• 1980s aluminum branch wiring with no AFCI protection. Opening the garage walls in a 1991 Mediterranean on Park Estates Drive revealed exactly this: a 100-amp main panel that couldn’t support a kitchenette and mini-split. We wrote a 200-amp subpanel upgrade into the contract as an allowance, priced before demolition.
• Slab and stem wall lacking moisture barrier or proper footing depth. The garage slab was poured direct-to-grade. No vapor barrier, no perimeter drain. For a bathroom wet wall, that’s a guaranteed failure after the first rainy season. We found it in inspection, priced the fix in writing, and passed code on first inspection.
• HOA design committee rejection after city permits are already drawn. A contractor who pulls Calabasas city permits before receiving written HOA design approval risks a complete redesign. We’ve seen The Oaks reject roof pitch, window trim, and stucco color on submittals that already had city plan check approval. Our sequence: HOA design approval first, then city permit application.
• Very High Fire Hazard Severity Zone construction requirements eliminating standard finishes. Vinyl siding, basic soffit vents, wood shingle roofs - all common in Agoura Hills or Thousand Oaks projects - are non-starters in Calabasas post-Woolsey Fire. Every exterior assembly must meet CBC Chapter 7A, which we specify from the first drawing.

Pricing for Garage Conversion ADU in Calabasas, CA

We Also Serve Cities Near Calabasas

Our crews work throughout the western San Fernando Valley and Ventura County corridor, including Garage Conversion ADU in Calabasas and neighboring West Hills, Topanga, Canoga Park, and Agoura Hills. Each city carries different HOA density, fire zone designation, and building department turnaround - we adjust our permit strategy accordingly.

FAQs - Garage Conversion ADU in Calabasas