Choosing the Right ADU Brand: A Buyer's Guide for Costa Mesa

Choosing the Right ADU Brand: A Buyer’s Guide for Costa Mesa

Boxabl’s Casita is the most-searched prefab ADU in America right now. Type “prefab ADU” into Google and its name dominates the results. But its fixed 361-square-foot floor plan and uncertain California delivery timeline make it a poor fit for the majority of Costa Mesa homeowners – a fact that’s obvious to anyone who has tried to site one, and invisible to anyone relying on the brand’s marketing. Our Complete Guide to ADU in Costa Mesa cuts through the brand noise. You’ll learn how Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, and Tuff Shed actually perform against the specific constraints of Costa Mesa lots, coastal climate, permitting requirements, and renovation timelines.

Call (833) 589-8273

Quick Answer

The right ADU brand for a Costa Mesa home depends on your lot dimensions, access for delivery, and what you’re willing to spend, as we detail in The Complete ADU Builders Guide for Costa Mesa Homeowners. For most standard Costa Mesa lots with alley access, wood-frame systems from Abodu or Plant Prefab offer the best balance of design flexibility, delivery feasibility, and long-term material performance. For narrow or difficult lots, steel-frame options like Cover solve access problems that panelized systems cannot. Boxabl and Tuff Shed occupy a budget niche, but each carries structural and quality trade-offs that matter in a coastal climate.

Table of Contents

• How Each ADU Brand Positions Itself (and What That Means for Costa Mesa)
• Lot-Size Compatibility: Which Brands Fit Costa Mesa Setbacks Without a Variance
• Delivery and Crane Logistics: Alley Access vs. Street Closure Reality
• Structural Systems and Coastal Climate: How Each Brand Handles Marine-Layer Moisture and Salt Air
• 2026 Lead Time Reality Check: Manufacturer Quotes vs. Southern California Delivery Windows
• Total Cost of Ownership: Maintenance, Warranties, and Interior Finish Integration
• A Step-by-Step Framework for Choosing Your ADU Brand
• Common Mistakes to Avoid
• When to Call a Professional
• Frequently Asked Questions
• The Bottom Line

How Each ADU Brand Positions Itself (and What That Means for Costa Mesa)

Every major prefab ADU manufacturer markets itself as the premium option. Each one was engineered around different priorities. Understanding those priorities matters because they map unevenly onto what a Costa Mesa lot actually demands. Here’s what each brand optimizes for, and where that optimization hits its limit.

Abodu builds wood-frame ADUs in a Hayward, California factory. Their pitch is speed and design quality, with three fixed floor plans that range from a 340-square-foot studio to a 610-square-foot two-bedroom. Abodu units are panelized, meaning walls arrive flat and get assembled on-site. In Costa Mesa, their standard widths work well for lots with 50-foot frontages or wider. The panels are light enough to move by hand in many cases, which means alley delivery can work without a crane.

Cover uses a cold-formed steel frame and manufactures wall, floor, and roof panels in a Gardena facility. Their system is precision-engineered – panels fit together with tolerances measured in millimeters. What sets Cover apart is that they can build to custom dimensions rather than forcing a lot into a fixed floor plan. For odd-shaped Costa Mesa lots, especially the older neighborhoods east of Newport Boulevard where lot lines angle, this matters more than any marketing language about “premium.” The steel frame also resists termites, which is a persistent issue in Southern California’s soil.

Dvele builds whole-module homes in a factory using structural insulated panels (SIPs) for walls, floors, and roofs. Their ADU line emphasizes energy performance and indoor air quality, with continuous insulation and tight air sealing as standard. Modules arrive as complete boxes, which means crane placement. Dvele’s engineering is genuinely high-end, but the modules are heavy – a 600-square-foot unit can weigh over 40,000 pounds – and that weight drives crane requirements and foundation engineering costs that many Costa Mesa homeowners don’t anticipate.

Mighty Buildings uses a proprietary concrete composite material printed into panels in their Oakland facility. The material is non-flammable, which is a legitimate advantage in California’s wildfire-adjacent building code environment. But Mighty Buildings has shifted focus in recent years toward larger multi-unit developments, and their ADU delivery volume in Southern California has been inconsistent. Availability matters. A brand that can’t deliver to Costa Mesa within a predictable window is a paper option.

Boxabl ships a single 361-square-foot Casita as a folded steel-and-foam module that unfolds on-site. The concept is clever and the unit is genuinely affordable on paper. But the Casita’s fixed dimensions, limited customizability, and notoriously long delivery queue – with some California orders waiting over two years – make it a niche option. We’ve had Costa Mesa homeowners contact us wanting a Casita because they saw the viral videos. Few of them end up buying one once they understand the timeline and what the unit cannot do.

Plant Prefab builds custom and semi-custom ADUs using a combination of SIPs and traditional framing. Their manufacturing happens in Rialto, California, which means shorter final-mile logistics for Costa Mesa projects. Plant Prefab positions itself around sustainability – low-VOC materials, reduced construction waste, energy efficiency as a design principle rather than an add-on. Their ADU line includes standard models that can be customized, and the quality of interior finishes is noticeably higher than budget-prefab competitors. They’re not the cheapest option. They’re the option for homeowners who want a custom-designed ADU without the site-built timeline.

Tuff Shed is not, strictly speaking, an ADU manufacturer. They build storage sheds and garages, some of which homeowners convert into accessory dwellings. Their structures are wood-framed and inexpensive. But the conversion process – insulation, drywall, plumbing, electrical, HVAC – happens on-site and adds substantial cost. A Tuff Shed can work as a low-cost ADU shell. Whether the final product meets Costa Mesa’s building code for habitable dwelling units depends entirely on the conversion work that follows.

What this means for you: no single brand wins for every Costa Mesa property. The brand that fits your lot, your timeline, and your budget is the right one. If you want to compare all seven in a single conversation rather than chasing down manufacturers individually, that’s exactly the service we provide – which is why we built our Costa Mesa ADU Builders home resource around brand-agnostic comparisons rather than a single-product pitch.

Lot-Size Compatibility: Which Brands Fit Costa Mesa Setbacks Without a Variance

Costa Mesa’s ADU regulations generally allow a detached accessory dwelling unit up to 800 square feet for a single-story structure (or 1,000 square feet if it’s a two-bedroom unit), with a standard rear setback of 4 feet and side setbacks of 4 feet. That sounds generous until you apply it to real Costa Mesa lots, many of which run 50 feet wide by 100 to 120 feet deep. On a 50-foot-wide lot, the buildable area between side setbacks is 42 feet. That’s plenty of width. The constraint is usually the combination of lot coverage rules, existing structures, and the placement of the primary home.

Here’s how each brand’s standard footprints interact with common Costa Mesa lot dimensions:

• Abodu: Their standard models run 14 to 20 feet wide and 24 to 34 feet deep. On a 50-by-100 lot, an Abodu unit fits comfortably in the rear yard with room to spare. On narrower lots (40 feet wide, common in the College Park and Westside neighborhoods), the 20-foot-wide model still clears side setbacks, but you’ll lose usable yard space.
• Cover: Because Cover builds to custom dimensions, lot compatibility is a design question rather than a catalog question. We’ve specified Cover units as narrow as 12 feet wide for lots where standard panels wouldn’t work. The steel frame handles narrow dimensions well because it doesn’t require the same wall thickness as wood SIP construction.
• Dvele: Modules arrive at full width – often 14 to 16 feet wide – which matches Costa Mesa setbacks fine. The challenge is depth. Their two-bedroom models run up to 40 feet deep. On a typical 100-foot-deep lot with a 30-foot-deep primary home and a required 20-foot rear yard, that leaves 50 feet for everything else. It works, but it’s tight.
• Mighty Buildings: Their ADU panels assemble into units as small as 350 square feet and as large as 1,000. The concrete composite construction means thinner walls than wood frame for equivalent insulation, which adds a few inches of interior space on constrained sites.
• Boxabl: The Casita’s 19-by-19-foot footprint (361 square feet) technically fits on any Costa Mesa lot. But its unfold-on-site sequence requires clear space around the delivery pad, and its appearance – a white box with no design flexibility – draws objections in neighborhoods with active HOAs or strict design review standards.
• Plant Prefab: Standard ADU models run from 350 to 1,200 square feet, with customization available. Their panelized system ships flat and assembles on-site, which means the lot dimensions don’t constrain delivery the way full-module systems do. This is a real advantage on Costa Mesa lots with limited side access.
• Tuff Shed: Their structures range from 8-by-12 feet to 16-by-40 feet. The 16-foot width clears Costa Mesa setbacks, but the structural framing is not sized for habitable use without additional engineering, which we’ll address in the total cost section.

The takeaway: if your lot is standard width (50 feet or more) with reasonable depth, every brand technically fits. If your lot is narrow, angled, or constrained by an existing pool, garage, or mature trees, the panelized systems (Abodu, Plant Prefab, Cover) give you placement flexibility that whole-module systems (Dvele, Boxabl) do not.

Delivery and Crane Logistics: Alley Access vs. Street Closure Reality

Most Costa Mesa homeowners assume that if a prefab unit fits on their lot, it will fit down their street. That assumption is wrong more often than you’d think. Delivery logistics are where prefab ADU projects can stall or incur surprise costs that no manufacturer’s brochure mentions.

Costa Mesa has a distinct advantage over many Southern California cities: a significant portion of its residential lots were platted with alleys running behind the homes. Roughly 40 percent of Costa Mesa single-family lots have alley access, concentrated in the older neighborhoods around Westside Costa Mesa, College Park, and parts of Mesa Verde. That alley access is worth real money on a prefab ADU project, because it means crane trucks and flatbed deliveries can approach the build site from the rear without closing a public street.

Here’s how delivery works for each construction method:

Panelized systems (Abodu, Plant Prefab, Cover): Walls, floors, and roof panels arrive on a standard flatbed truck. If the truck can reach the site – or get within crane reach of it – the panels unload in hours. No street closure required for most standard lots. Alley-accessed lots are ideal; street-accessed lots often work too, because the flatbed parks in the driveway or at the curb, and panels move to the rear yard by hand, wheeled cart, or a small crane. This is the least logistically disruptive delivery method in Costa Mesa.

Whole-module systems (Dvele, Boxabl): The unit arrives as a complete box. Dvele modules are heavy – 30,000 to 50,000 pounds depending on size – and require a large crane. Boxabl’s Casita is lighter but still requires a crane or specialized trailer for placement. On an alley-accessed lot, the crane sets up in the alley and lifts the module into the rear yard. On a street-accessed lot, the crane must set up on the street, which requires a temporary encroachment permit from the City of Costa Mesa and often triggers a street closure. That’s a cost and a coordination burden, not a dealbreaker. But it’s a real cost that manufacturer websites don’t spell out.

On-site builds (Tuff Shed conversions): Materials arrive on a standard lumber truck. No crane, no module, no street closure. This simplicity is part of why some Costa Mesa homeowners still choose the shell-and-conversion approach. The complication arrives later, during the interior conversion.

We’ve delivered ADUs on Costa Mesa streets that seemed impossible at first glance. We’ve also told homeowners that a module they liked simply wouldn’t make the turn into their alley. The brand-agnostic approach matters here: we can compare Abodu’s panel delivery against Dvele’s module delivery against Cover’s custom steel panels for your specific lot rather than selling you on one method and hoping it works.

Structural Systems and Coastal Climate: How Each Brand Handles Marine-Layer Moisture and Salt Air

Costa Mesa sits about two miles from the Pacific. That proximity shapes how building materials age. The marine layer delivers morning fog and persistent humidity from late spring through early fall. Salt air carries inland on the prevailing westerly breeze. These aren’t catastrophic conditions – homes in Costa Mesa stand for decades – but they do expose any material weakness in an ADU’s structural system and exterior cladding over a 20- to 30-year horizon.

The structural systems break into four categories:

1. Wood frame (Abodu, Tuff Shed): Wood is the standard American building material for good reason. It’s inexpensive, readily available, and every contractor and inspector understands it. In Costa Mesa’s coastal climate, wood requires proper vapor management and paint maintenance to resist the persistent moisture. Rot is the enemy. The critical variable is not the wood itself but how the panel seams and window openings are flashed and sealed during assembly. Abodu’s factory-controlled manufacturing produces tight, consistent joints. Tuff Shed’s structures are built for storage use, not habitation, and their seam sealing will not meet residential building code without extensive on-site remediation.

2. Steel frame (Cover): Steel does not rot, does not burn, and does not host termites. That’s a genuine advantage in coastal Southern California, where subterranean termites are active year-round. The concern with steel in salt air is corrosion. Cover addresses this with a zinc coating on the steel members and factory-applied exterior finishes. Properly detailed, a steel-framed ADU should outlast a wood-framed one in Costa Mesa’s climate with less maintenance. The trade-off: steel conducts heat more efficiently than wood, so the wall assembly must include thermal breaks. Cover’s engineering handles this, but it’s a factor in their pricing.

3. SIP panels (Dvele, Plant Prefab): Structural insulated panels sandwich rigid foam insulation between two oriented strand board (OSB) skins. The foam core eliminates thermal bridging through the wall, which makes SIP-built units measurably more energy-efficient than wood-frame construction. In Costa Mesa’s mild climate, the energy savings are modest – you’re not fighting a Minnesota winter – but the airtight construction also keeps marine-layer moisture out of the wall cavity. That matters. Moisture infiltration into wall cavities is what leads to mold, and mold is the slow killer of building durability. SIPs reduce this risk when properly manufactured and assembled.

4. Concrete composite (Mighty Buildings): Mighty Buildings’ material is a proprietary lightweight concrete that is fire-resistant, rot-proof, and immune to termites. It’s arguably the most durable of the four systems in a coastal environment. The material doesn’t absorb moisture the way wood does, and it doesn’t corrode like steel can. The trade-off is that the material is unusual enough that long-term data is thinner than it is for wood or steel. We’re watching Mighty Buildings projects in Southern California with interest, but for a homeowner making a 30-year investment, established material track records still carry weight.

One exterior material consideration applies regardless of structural system: cladding. We specify James Hardie fiber-cement siding on many of our ADUs because it holds up to Costa Mesa’s marine-layer moisture without warping, resists impact, carries a Class A fire rating, and needs repainting far less often than wood. It costs more than vinyl or basic plywood sheathing. It also avoids the maintenance tail that cheap cladding creates. When you’re comparing brands, ask what’s on the outside of the ADU, not just what’s inside the walls.

2026 Lead Time Reality Check: Manufacturer Quotes vs. Southern California Delivery Windows

Every prefab ADU manufacturer publishes a lead time. Most of those numbers are optimistic. In our experience across Southern California projects, here’s what those quoted numbers actually look like in practice.

Abodu quotes 6 to 9 months from deposit to completed installation. In practice, Abodu is one of the more reliable delivery partners. Their Hayward factory runs consistent volume, and their standardized floor plans mean fewer custom-engineering delays. We’ve seen Abodu units arrive on schedule in Costa Mesa more often than not.

Cover quotes 8 to 12 months. Because every Cover unit is custom-dimensioned, the engineering queue is real. But their Gardena facility is close enough that final-mile logistics are simple. Expect the upper end of their range on complex lots.

Dvele quotes 10 to 14 months. Their whole-module approach means factory capacity is a hard constraint. Dvele has periods of high demand that stretch lead times without warning. If you’re planning around a family member moving in by a specific date, Dvele’s timeline carries more uncertainty than panelized alternatives.

Mighty Buildings quotes variable timelines depending on their current project pipeline. Their focus has shifted toward larger developments, which means single-unit ADU orders may wait. We advise Costa Mesa homeowners to treat Mighty Buildings as a “check availability” option rather than a primary plan.

Boxabl quotes lead times that have ranged from 6 months to over 24 months depending on who you ask. The company has raised significant capital and expanded production, but California delivery volume remains inconsistent. If your timeline has any hard deadline, Boxabl is a gamble.

Plant Prefab quotes 8 to 12 months. Their Rialto factory is the closest major prefab facility to Costa Mesa, which removes a full shipping leg that Northern California manufacturers must contend with. We’ve found Plant Prefab lead times to be honest and relatively stable, though customization adds engineering time on the front end.

Tuff Shed can deliver a shell in weeks, not months, because the product is a storage shed, not a dwelling unit. The timeline for a permitted ADU conversion depends entirely on the construction work that follows – foundation retrofitting, insulation, drywall, plumbing, electrical, and finishes. A realistic total timeline for a Tuff Shed ADU conversion is 6 to 9 months, comparable to other systems but with more site work and more permits.

One more reality check: prefab lead times do not include Costa Mesa’s permitting review period, which currently runs 2 to 4 months for a standard ADU application if the project complies with the state’s streamlined ADU approval requirements. Your total timeline from signed contract to move-in should factor both numbers.

Total Cost of Ownership: Maintenance, Warranties, and Interior Finish Integration

Purchase price is the number everyone focuses on. Total cost of ownership is the number that actually matters over 10 or 20 years. Here’s how Costa Mesa-specific factors shift the math.

Maintenance Cost Drivers by Brand

• Abodu and other wood-frame units: Expect exterior repainting every 7 to 10 years in Costa Mesa’s sun and marine-layer humidity. Budget $4,000 to $8,000 per repaint for a typical ADU exterior, depending on size and access.
• Cover steel-frame units: Steel doesn’t rot, but exterior finishes still age. Repainting or refinishing intervals extend to 12 to 15 years, but when refinishing is needed, access and specialty coatings can push costs higher than wood repainting.
• Dvele and Plant Prefab SIP units: The continuous insulation and tight air sealing mean less mechanical stress on HVAC systems and fewer moisture-related repairs. Expect lower annual utility costs and fewer unplanned repairs. The OSB skins are still susceptible to moisture if flashing fails, so regular inspection of roof and window seals is important.
• Mighty Buildings: The composite material requires minimal maintenance. There’s no rotting, no corrosion, no termite risk, and limited refinishing needs. If their delivery timeline works for you, the long-term maintenance profile is attractive.
• Boxabl: The steel-and-foam sandwich is relatively low-maintenance, but the unit’s compact size and fixed interior design limit flexibility if your needs change. Maintenance is less the concern than obsolescence.
• Tuff Shed conversions: Lowest upfront cost, highest ongoing maintenance of any option on this list. The original structure was never designed for habitation, which means the retrofit work carries ongoing risk in areas like foundation settlement, moisture management, and mechanical system integration.

Warranty Reality in California

California’s consumer protection laws are stronger than most states when it comes to construction and manufactured housing defects. The Song-Beverly Consumer Warranty Act and the Right to Repair Act (SB 800) provide legal frameworks that homeowners can use if a product fails to perform. But warranty strength matters less than the warranty issuer’s willingness and ability to honor claims. A manufacturer that has shut down its ADU line or shifted focus to other markets is not going to be responsive ten years after your unit arrives.

We’ve seen homeowners chase warranty claims with manufacturers who no longer staff the department that handled their product category. The practical advice: evaluate not just what the warranty covers, but whether the company is actively building and delivering ADUs in Southern California today. Active delivery volume is a proxy for the likelihood that warranty support will exist when you need it.

Interior Finish Integration

This is where your choice of ADU brand intersects with your overall project plan. A prefab ADU arrives as a structural shell with factory-installed finishes that vary by manufacturer. What happens if you want a custom kitchen in your ADU? Or a bathroom layout that differs from the manufacturer’s standard? Or you want the ADU’s interior finishes to match your primary home’s remodeled kitchen and bathroom?

Some manufacturers offer customization. Others do not. Boxabl’s Casita does not. Tuff Shed offers no habitable interior finishes at all – everything happens on-site. Abodu offers limited customization within their floor plans. Plant Prefab and Cover offer the most customization headroom, but the coordination between the prefab shell and the interior finish work is where projects break down.

We built our company around solving this specific problem. We compare every leading prefab brand in one conversation. We also handle Kitchen Remodeling in Murrieta and Bathroom Remodeling in Murrieta in-house, which means the interior finish work on your ADU happens under the same contract as the structural delivery. No handoff between a prefab manufacturer, a general contractor, and a separate kitchen-and-bath subcontractor. When the ADU and the primary home remodel happen in the same project phase, that single-contract structure eliminates the coordination gaps that stall multi-contractor ADU projects. If you’re also considering a larger ADU project in the Inland Empire, our ADU Builders in Murrieta page covers the same brand comparison for that market.

A Step-by-Step Framework for Choosing Your ADU Brand

Here’s the process we walk Costa Mesa homeowners through when they’re comparing brands, with more guides & resources available on our blog. It works whether you work with us or go direct to a manufacturer.

1. Survey your lot. Measure the actual buildable area, accounting for Costa Mesa setbacks, existing structures, utility easements, and significant trees. Don’t guess. If your lot is 50 feet wide and 100 feet deep, you have different options than if it’s 40 feet wide with an irregular rear lot line.
2. Confirm your access path. Do you have alley access? Is the alley wide enough for a crane or flatbed? If you’re street-accessed, is there room for a crane setup without closing the street? This single factor can eliminate whole-module systems before you spend time evaluating them.
3. Set a hard timeline. If a family member is moving in by a specific date, or you’re planning rental income starting in a specific month, work backward from that date. Subtract Costa Mesa permitting time (2 to 4 months), site work (1 to 2 months), and installation (1 to 3 months). The remainder is your maximum acceptable manufacturer lead time.
4. Define your interior requirement. Are you okay with the manufacturer’s standard finishes, or do you want custom kitchen and bathroom work? If custom, factor that into your brand shortlist. Some brands integrate customization more cleanly than others.
5. Price the real total. Get quotes for the factory unit, delivery, crane (if needed), foundation, site utilities, and interior finishes. Compare total installed cost, not factory price. A $150,000 factory quote that requires $50,000 in site work is more expensive than a $180,000 factory quote with $10,000 in site work.
6. Check active delivery volume. Is the manufacturer currently delivering ADUs to Southern California? Call references. Ask for recent Costa Mesa or Orange County installations. A brand that was popular three years ago but has since stalled is a risk.
7. Decide who manages the interior. If your ADU needs interior finishing beyond the factory standard, decide whether you’ll manage that separately or bring it under one contract. This decision affects both price and timeline.

Common Mistakes to Avoid

• Choosing a brand before assessing lot access. You fall in love with a Dvele floor plan, then discover your alley won’t accommodate the crane. Start with your lot, not with a brand’s marketing materials. Lot constraints in older Costa Mesa neighborhoods can eliminate whole-module delivery as a practical option.
• Comparing factory prices instead of installed prices. A $100,000 factory unit can cost $180,000 installed after foundation, crane, utilities, and permits. A $140,000 panelized system might install for $160,000. The gap between factory price and total installed cost varies enormously by system.
• Ignoring the marine-layer factor. Costa Mesa’s coastal humidity is not a neutral condition. Wood-frame construction needs proper flashing, sealing, and paint maintenance to avoid moisture problems. Choosing the cheapest cladding option makes the problem worse. James Hardie fiber-cement or equivalent durable cladding is not a luxury in this climate.
• Assuming manufacturer lead times are accurate. Quoted lead times are targets. Some manufacturers hit them consistently. Others don’t. If your timeline has a hard deadline, build in buffer or choose a manufacturer with a track record of on-time Southern California delivery.
• Underestimating the interior finish scope. A prefab unit arrives as a structural shell with limited interior finishes. If you want a functional kitchen, a real bathroom, and finishes that match your standards, that’s additional work. Plan for it in both budget and timeline.
• Treating ADU delivery and interior remodeling as separate projects. If the ADU shell arrives from one vendor and the interior work happens under a separate contract, you become the project manager. Coordination gaps, schedule conflicts, and finger-pointing when something goes wrong are common. A single contract covering structure and interior avoids these problems.
• Chasing viral marketing over delivered product. Boxabl’s Casita looks great in a video. The delivery reality in California has been less impressive. Evaluate brands based on recent Southern California installations, not social media presence or search volume.

When to Call a Professional

If your lot is standard, your timeline is flexible, and you’re comfortable managing the coordination between a manufacturer, a crane operator, a foundation contractor, and an interior finish crew, a direct-to-manufacturer approach can work. But if your lot has access constraints, if your timeline has a hard deadline, if you want a custom kitchen or bathroom in the ADU, or if you’ve never managed a construction project before, professional guidance pays for itself in avoided delays and rework. Costa Mesa ADU Builders offers free estimates in Costa Mesa and can walk through the brand comparison, the site feasibility check, and the interior finish planning in a single consultation. Call (833) 589-8273 to schedule yours.

Frequently Asked Questions

The Bottom Line

The best ADU brand for a Costa Mesa homeowner is not the one with the strongest marketing or the highest search volume. It’s the one that matches the lot dimensions, access path, timeline, and budget of the specific property. Panelized wood-frame and steel-frame systems deliver the most consistent results in this market. Whole-module and budget-shell alternatives solve specific problems but carry specific trade-offs. Your choice should start with your lot, not with a brand’s website. Costa Mesa ADU Builders compares all seven major prefab brands in one conversation and carries the project from structural shell through finished interior under one contract.

Written by the team at Costa Mesa ADU Builders, serving Costa Mesa since 2012.