Transform Your Garage: Why New ADUs Outperform Conversions

We often receive inquiries from homeowners interested in transforming their garages into Accessory Dwelling Units (ADUs), with cost savings as the main motivation. While reusing an existing structure sounds appealing, we typically recommend demolishing the garage and building a new, customized ADU from the ground up. Here are the main reasons why a fresh start often provides better results:

Renovating Existing Garages: More Work Than You Think

Garages were not originally designed for living. Converting one to an ADU typically involves extensive renovations that quickly add complexity, time, and cost to the project.

1. Structural Limitations: Many garages lack adequate foundations or structural reinforcements, and their walls, roofs, and floors may be in poor condition. You might face additional work to stabilize walls or completely overhaul roofing.
2. Space Constraints: Existing garages often have awkward layouts, minimal natural lighting, and limited space for insulation, which complicates design and reduces comfort.
3. Plumbing and Electrical: Few garages are prepped for residential plumbing or electrical systems. Adding these features involves cutting through concrete floors, which can be labor-intensive and costly.

For example, one recent Dwelly client’s garage required digging out sections of foundation by hand to add footings, adding over $12,000 in costs. Ultimately, the process is more involved, leading to unexpected expenses, prolonged timelines, and design limitations.

Garage Conversions Don’t Save Money in the Long Run

While converting an existing garage might seem like a budget-friendly choice, costs for these projects are often similar to—or even exceed—the cost of building a new ADU.

• Construction Costs: The cost to bring a garage up to code, add proper insulation, repair damage, and install plumbing and electrical typically falls in the same range as a new build—between $175,000 and $250,000.
• Unforeseen Repairs: Many garages require extensive repairs, from replacing damaged siding to re-pouring concrete slabs. These hidden costs can quickly add up, leaving little room for meaningful savings.

Instead of settling for a retrofitted structure, investing in a ground-up ADU enables you to design a home that suits your needs and maximizes your budget.

Better Comfort, Health, and Sustainability with New Construction

A purpose-built ADU allows you to create a more comfortable, energy-efficient, and sustainable living space from day one.

• Enhanced Insulation: New ADUs can be built with thicker walls and roofs, which accommodate better insulation. This ensures more consistent indoor temperatures, reduces energy costs, and lowers the carbon footprint.
• Healthier Air Quality: With a new build, you can choose sustainable materials and ensure proper ventilation, which promotes better indoor air quality.
• Energy Savings: By designing to modern standards, a new ADU can be optimized for reduced energy consumption, leading to significant savings over time. For example, higher R-values in walls and roofing reduce reliance on heating and cooling, providing a more comfortable home while minimizing environmental impact.

Customize Without Limits

Garages weren’t designed for residential use, and the limitations of the structure often lead to cramped or inefficient layouts.

• Tailored Design: Building from scratch gives you flexibility in size, layout, and design to create a living space that fits your lifestyle and integrates seamlessly with your property.
• Natural Light: New ADUs can be positioned and designed to optimize natural light and ventilation, creating a more open, airy, and comfortable environment.

Prioritize Environmental Responsibility: Request Waste Recycling

At Dwelly, we’re committed to building responsibly and minimizing waste. When starting an ADU project, ask your contractor about recycling and waste management to ensure that construction materials are reused or recycled where possible. Diverting waste from landfills not only supports environmental sustainability but also reduces the project’s carbon footprint. With recycled materials and sustainable disposal practices, you can contribute to a greener building process.

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In some cases, a garage conversion may still make sense, particularly if the garage is in excellent condition and on a tight budget. However, for most clients, a new ADU brings greater value, comfort, and sustainability. Building new allows you to create the space you envision—without compromise.