How Much Does a Garage Conversion to an ADU Really Cost in Los Angeles?

If you live in Los Angeles, chances are you've thought about how to make better use of your space. With housing prices rising and square footage at a premium, it makes sense to turn that old garage into something more useful, maybe a rental, guest house, home office, or just an extra room for family.

One of the most popular ways homeowners are doing this today is by garage conversion to ADU — also known as an Accessory Dwelling Unit.

But the big question is... how much does it actually cost? Let’s talk about it in simple terms.

First—Why Convert a Garage into an ADU?

Before we dive into costs, let’s talk about the “why.” Los Angeles is not exactly known for its abundance of space. If you're like most homeowners here, every square foot matters. Converting a garage gives you:

• A private space for family or guests
• A rental opportunity for passive income
• A cozy home office, studio, or personal retreat
• An increase in property value

It's one of the smartest investments you can make as an LA homeowner—if done right.

So, What Factors Affect the Cost of Converting a Garage into an ADU in LA?

You won’t find a one-size-fits-all price tag here. In LA, garage conversions to ADU vary widely depending on a few key factors. Let’s break it down:

1. The Condition of Your Existing Garage

Start by taking a good look at what you’re working with. Is your garage in decent shape—with solid walls, a dry interior, and no visible damage? Or is it more like an old, dusty storage room with a sagging roof and flickering lights?

The more repairs or upgrades needed to bring it up to basic living standards, the more you’ll likely spend. Think of it this way: fixing what’s broken comes before building what’s new.

2. The Size of the Space

Size really does matter. A compact, single-car garage will cost less to convert than a larger two-car garage. More space means more materials, more labor, and often a more complex layout. Want to add walls or divide the space into separate areas? That will add to the total.

3. The Kind of ADU You Build

Not all ADUs are created equal. Are you just looking for a cozy guest studio with a bathroom? Or a fully equipped one-bedroom unit with a living room, kitchen, laundry, and sleek finishes? The more features and rooms you add, the more planning, plumbing, and permits are involved. It’s totally doable—and worth it—but it will shape the final cost.

We also provide paid conceptual design and budget planning services, including 3D renderings and 360-degree virtual walk-throughs, to help you visualize your project design and plan your budget effectively.

4. Plumbing, Electrical, and HVAC Needs

Here’s where things can really add up. Most garages weren’t built with living in mind, meaning no water lines, drains, heating, or cooling.

Installing plumbing for the kitchen and bathroom, HVAC for year-round comfort, or upgrading your electrical panel to power everything safely are significant investments. If your garage is far from your main house, trenching might be needed to connect utilities. Not fun, but necessary.

5. Permits, Plans, and Inspections

Navigating the legal side of a garage conversion is a critical step in the process. In Los Angeles, converting your garage into an ADU requires proper permits, approved plans, and inspections to ensure the structure is safe, up to code, and livable. While it may seem like a lot of red tape, a qualified ADU contractor will help guide you through the process and handle much of the paperwork on your behalf.

Additionally, it’s essential to understand that ADU laws are primarily for long-term rental purposes, not for extending an existing house for family use. Make sure to consult with your contractor to align your plans with current regulations.

Hidden Costs? Let’s Be Honest About That!

Many homeowners are surprised by the “extras” that pop up during a garage conversion. Things like:

• Upgrading the foundation
• Insulation and soundproofing
• Roof repairs or replacement
• Earthquake code compliance (yep, it is LA!)

That’s why it’s essential to build a little flexibility into your budget.

Your Dream ADU Might Be Closer Than You Think

So, how much does it cost for a garage conversion to ADU in LA? The honest answer is — it depends. But one thing’s for sure: it’s one of the smartest ways to improve your home, add usable living space, and build long-term value.

If you're thinking about converting your garage, take that first step. Talk to our local ADU contractor, get your space assessed, and ask questions. For a free consultation, contact us directly by phone or explore our past ADU projects for more ideas!