Key Takeaways
- Garage conversion costs vary widely, from $6,000 on the low end up to $180,000+ for a full ADU conversion.
- Homeowners in California can legally handle their own conversions, but everything still has to pass inspection.
- Hiring a licensed general contractor is the best way to ensure your garage conversion provides an ROI of 80% or more.
- The type of conversion and the size of your garage have a huge impact on the overall cost. A project that needs electrical and plumbing will always cost more than a basic room conversion.
Whether you’re interested in adding a home office or an apartment equipped with a bathroom and kitchen, a garage conversion is a great way to add livable space to your home. But how much does a garage conversion cost?
In this guide, we’ll cover everything you need to know about cost before planning your garage conversion.
Cost of Converting Your Garage
In California, garage conversions are one of the most popular ways to add living space without building from scratch. Garage conversions cost less than ground-up construction because the structure already exists. You’re essentially remodeling and upgrading rather than building new.
According to Angi, the average cost is between $6,007 and $27,702 for simpler projects. Full ADU conversions, on the other hand, range from $80,000 to $180,000. The prices vary considerably, however, based on the scope and extent of the project, the materials used, and your location.
What Affects the Garage Conversion Cost?
A lot of variables come into play when determining how much a garage conversion costs. The biggest driver is the scope of the project. A simple office conversion that doesn’t require plumbing will cost a lot less than a full apartment.
The size of your garage also has an impact. A 240sqft garage will cost quite a bit less to convert than a 500sqft garage. Other variables include location, labor rates, structural and utility upgrades, permits, materials, and finishes. Mid-grade fixtures and standard materials will keep costs down, while custom cabinetry or premium materials will push the cost up.
Garage Conversion Cost Per Square Foot
A garage conversion in California typically costs between $25 and $75 per square foot, with an average of $40 per square foot. The bigger your garage, the higher the cost. For a 240sqft garage, expect a garage conversion cost of $6,000 to $18,000.
On the other hand, the cost of converting your garage to a full ADU ranges between $250 and $350 per square foot. A 240sqft garage will range between $60,000 and $84,000, while a 600sqft garage will range between $150,000 and $210,000.
Cost by Type of Garage Conversion
What you plan to use the space for determines everything about the cost. The main dividing line is whether you need plumbing. A simple room without water or sewer ties stays in a much lower price range. Once you add a bathroom, kitchen, or both, the cost goes up quite a bit.
The Cost to Convert to a Bedroom
One of the most common projects is a garage-to-bedroom conversion. It typically includes insulation, drywall, flooring, lighting, windows for egress (required by code), and HVAC extension. In California, a simple bedroom will cost around $12,000. If you add a bathroom, that’s another $10,000 to $25,000.
Cost to Convert to a Room
If you’re just looking to convert the garage to a general-purpose room, such as a den or media room, the cost will be similar to a bedroom. However, it doesn’t require an egress window, which can save you some money, so expect to pay at least $7,500.
Cost to Convert to an Office
A home office conversion is similar to a general room but might include more electrical work for outlets, data cabling, and dedicated lighting. You might also want soundproofing if the garage shares a wall with the main house. The cost of converting your garage to an office starts at $5,000.
Cost to Convert to an Apartment
Converting your garage into a full apartment–also known as an Accessory Dwelling Unit, or ADU–is the most expensive option. The cost ranges between $60,000 and $180,000, but it also adds the most value to your home. You’ll need a kitchen, bathroom, and a separate entrance. Plus, you’ll need to fully comply with California’s building code.
Cost to Convert to a Gym
Converting your garage to a gym is one of the least expensive options on this list at around $6,000, not including the exercise equipment. You’re essentially finishing the space with durable, workout-friendly materials and no heavy finish work.
Some people choose to leave the garage door operational to open it for ventilation, though that reduces climate control efficiency. One thing to consider: if you’re adding heavy equipment like squat racks, plate-loaded machines, or a treadmill, make sure the concrete slab is in good condition.
How Much Does it Cost to Hire a Contractor for a Garage
Conversion?
With so many different trades required and numerous local codes to comply with, hiring a general contractor for your garage conversion typically provides the best results. Expect to pay a licensed general contractor 50% to 60% of the total project cost in labor. For a project that costs $25,000, about $12,500 to $15,000 will go to the general contractor.
Other Factors That Influence the Cost
When it comes to garage conversion costs, a number of factors influence the total price. The size of the garage and the scope of the project are probably the two biggest factors. The cost of permits can vary widely depending on your location. Here’s a look at some of the other factors that influence cost:
How Much Do Permits Cost?
California has streamlined its ADU permitting process, but fees vary widely by city. Some cities charge a flat fee while others charge based on the value of the project. Expect to pay at least $300 to $1,000 for permits, but the cost can go as high as $15,000 for a full ADU conversion.
Electrical Costs
Most garages have minimal electrical service, which means you’ll likely need new circuits, outlets, lighting, and possibly a panel upgrade. A typical cost for electrical work ranges from $1,000 to $3,000.
Plumbing Costs
Plumbing is one of the biggest variables when it comes to garage conversion costs. If you’re adding a bathroom or kitchenette, you’ll pay at least $1,500 to $4,000 for basic tie-ins. A full kitchen and bath can hit up to $35,000, depending on how far the existing plumbing is from the garage.
Door Costs
While some home gym conversions leave the garage door operational, most require the door to be replaced with a wall. The cost to remove the garage door, frame in a wall with insulation, and add a standard entry door usually ranges between $200 to $1,000.
Window Costs
If the converted space is a bedroom, you’ll need an egress window that’s large enough to escape through. This is a code requirement and cannot be skipped. The cost to add one or more windows typically ranges between $500 and $2,000.
Insulation Costs
Garages usually don’t have any insulation, but it’s required in California under Title 24. Bringing walls, ceiling, and floor up to living-space standards with insulation typically costs between $500 to $2,000.
HVAC Costs
Ductless mini-splits are the most common and affordable HVAC option for garage conversions at $1,500 to $4,000. Tying the garage into your existing HVAC system can cost closer to $3,000 to $5,000+.
Flooring Costs
The type of flooring you choose will majorly impact how much it costs. Carpet and laminate are usually on the more affordable side, while tile and hardwood cost more. Expect to pay between $1,000 and $4,000 for flooring.
Drywall Costs
Drywall typically costs between $1,000 and $3,000, or $2 per square foot. While ADUs and bedrooms need to be finished with drywall, a home gym or office may be fine without it.
Can You Legally Do a Garage Conversion Yourself?
Yes! In California, if you live in and own the home, you can legally pull your own permits and do your own work. However, the better question is: should you do it yourself? A garage conversion is not a DIY project for beginners. If you decide to do the work yourself, take these caveats into consideration:
- You assume full liability. You don’t have contractor’s insurance if something goes wrong, and you still need to pass inspections.
- Financing and resale can be harder if the work isn’t done by a licensed contractor.
- Many jurisdictions require licensed pros for structural, electrical, or plumbing work beyond basic repairs.
If you’re doing a simple garage-to-office with no plumbing and minimal electrical, DIY is feasible. But for a full ADU with a kitchen and bathroom, hiring a licensed contractor is worth the cost. They’ll help you avoid delays, code violations, and safety risks.
Ways You Can Save Money on Your Garage Conversion
Looking to lower your garage conversion cost? Here are a few tips:
- Use the existing layout. Don’t move walls or the garage door opening unnecessarily. Any structural change adds engineering and labor costs.
- Go with a ductless mini-split rather than extending your existing HVAC system.
- Get quotes from multiple contractors to find the best prices.
- Do the demo and prep work yourself. Clearing out the garage, demoing old drywall, and basic cleanup are straightforward DIY tasks that can save quite a bit in labor costs.
- Use standard fixtures and finishes rather than opting for custom features.
How Much Does a Garage Conversion Increase Home Value?
A garage conversion can increase your home value, but how much depends on the quality of the conversion and the market. In general, you can expect an 80% ROI if the work is done by a licensed contractor. If, for example, you spend $20,000 to convert the garage to a bedroom, your home value may increase by $16,000.
In some markets, a well-done conversion can return more than you put in, especially for ADUs that can generate rental income. A poorly or illegally done conversion (no permits, bad finishes, or ugly work) can decrease value, so make sure you take that into consideration.
Finding the Right Contractor for Your Garage Conversion
If you’re looking to add more liveable space to your home, a garage conversion is one of the highest-value home improvement projects you can do. But the cost can vary widely depending on a number of factors. The scope and size of your project have the biggest impact on the garage conversion cost.
Have more questions about the cost of converting your garage? Looking for an experienced contractor to handle the project? You can count on LNL Construction! Our experienced contractors provide high-quality work to customers throughout Sacramento. Give us a call today to schedule an estimate!
FAQs
Does a garage count toward home square footage?
No, a garage doesn’t usually count toward your home’s liveable square footage. However, after completing a garage conversion with insulation, heating, and finished walls and flooring, it will count as square footage.
How long does a garage conversion take?
The total time depends on the scope and complexity of the project. A simple room that doesn’t need plumbing may take a few weeks after the permits are approved, while a full ADU with kitchen and bath is closer to 3 to 5 months. Overall, from design to completion, expect between 6 to 10 months.
How long does it take to get garage conversion permits?
It can take between 4 to 10 weeks, depending on your city and how complex the project is. Thanks to California ADU laws, permits for garage-to-ADU conversions are supposed to be processed faster than other construction projects.
Do you need a contractor for a garage conversion in California?
Legally, no, you can do the work yourself if you’re the homeowner and live on the property. You will need to pull the permits as an owner-builder and do the work or hire individual subs yourself. Anyone you hire for work that requires a permit or that’s valued at more than $1,000 for labor/material needs to hold a valid CSLB license. Even if you do all the work yourself, it will need to pass inspections. If you ever sell the home, you’ll be asked to disclose whether the work was done by a licensed contractor.
Do you need to replace the parking after converting your garage?
No, you don’t. California law specifically prohibits cities from forcing you to build replacement parking. After your garage conversion, you can park in your driveway or any legal parking spots.
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