Yes, building an attached garage is usually cheaper than a detached one. An attached garage typically costs 10% to 15% less because it shares a wall with your house. This means you need fewer building materials and less work to finish the job.
In this guide, you’ll learn the real cost differences between these two garage types. We’ll break down construction costs, show you money-saving tips, and help you pick the right option for your home and budget.
Understanding the Main Cost Difference
When you’re planning a new garage, cost matters; the difference between attached and detached garage construction comes down to how much building you need to do.
Why Attached Garages Cost Less:
An attached garage connects right to your house. This setup saves money in several ways:
- Shared Walls: You only build three new walls instead of four
- Foundation Work: The garage uses your home’s existing foundation
- Utility Hookups: Electricity and heating connect easily to your home’s systems
- Labor Time: Builders spend less time on the project
An attached garage only requires you to build three walls, which cuts down on materials like lumber, siding, and insulation. Your contractor doesn’t need to create a completely separate structure.
The Extra Costs of Detached Garages:
A detached garage stands apart from your house. This means more work and higher costs:
- Four Complete Walls: You’re building an entire new structure
- New Foundation: The garage needs its own concrete base
- Separate Utilities: Running electricity and heat costs more
- More Materials: Siding, roofing, and framing for all sides
Breaking Down Garage Construction Costs
Let’s look at real numbers. Homeowners typically pay between $35- $70 per square foot to build a garage, but this changes based on the type you choose.
Attached Garage Costs:
For a standard two-car attached garage (around 24×24 feet):
- Average Cost: $19,600 to $28,200
- Price Per Square Foot: $30 to $50
- Total Project Time: 2 to 4 weeks
The lower end gives you basic construction with standard materials. Higher prices include better finishes and custom features.
Detached Garage Costs:
The same size detached garage costs more:
- Average Cost: $20,000 to $57,600
- Price Per Square Foot: $40 to $100
- Total Project Time: 4 to 6 weeks
A detached garage is about 10% to 15% more expensive than building an attached garage because of the extra structural work needed.
Cost Comparison Table:
Garage Type Two-Car Size Cost Range Cost Per Sq Ft
Attached 480 sq ft $19,600-$28,200 $30-$50
Detached 480 sq ft $20,000-$57,600 $40-$100
What Makes Each Garage Type Different
Beyond the price tag, each garage style offers different benefits for your home.
Benefits of Attached Garages:
Easy Access: Walk straight from your car into your house. This helps on rainy days or when carrying groceries.
Lower Heating Costs: The shared wall helps keep both your home and garage warmer in winter.
Faster Construction: Building onto your existing home takes less time than starting from scratch.
Simple Permits: Most areas have easier rules for attached additions.
Benefits of Detached Garages:
More Design Freedom: Build the size and style you want without matching your house perfectly.
Noise Separation: Workshop sounds and car noise stay away from living spaces.
Room to Grow: Add a second floor or expand later without touching your house.
Safety Buffer: Keep fumes and garage activities separate from your home.
Hidden Costs to Watch For
Both garage types come with extra expenses that surprise homeowners. Plan for these from the start.
Foundation and Site Work:
Your property might need:
- Ground leveling: $500 to $3,000
- Soil testing: $300 to $800
- Drainage systems: $1,000 to $5,000
Rocky or sloped ground adds to these costs.
Permits and Inspections:
Obtaining a permit for an existing structure tends to be more difficult and costly for attached garages in some areas. Check with your local building department before starting work.
Budget for:
- Building permits: $200 to $1,500
- Electrical permits: $100 to $400
- Inspection fees: $200 to $600
Utility Connections:
Attached Garages: Running electricity and plumbing to an attached garage is generally cheaper because the utilities are already accessible from your home.
Detached Garages: Need separate electrical lines run underground or overhead. This adds $1,000 to $3,000 to your project.
Choosing Between Attached and Detached
The right choice depends on more than just the upfront Cost.
When Attached Makes Sense:
Pick an attached garage if you:
- Want the lowest construction cost
- Need easy access from your house
- Have limited yard space
- Live in a cold climate
- Want faster completion
When Detached Is Better:
Choose a detached garage if you:
- Need a workshop or hobby space
- Want to protect your home from garage noise
- Have a small house that would look odd with a big garage
- Plan to add a living space above the garage later
- Need room for three or more cars
Money-Saving Tips for Your Garage Project
Keep costs down with these smart choices:
Do Site Prep Yourself: Clear the area and level the ground before your contractor starts.
Choose Standard Sizes: Custom dimensions cost more than standard garage sizes.
Skip Extra Features at First: Add storage systems, windows, and finishing touches later.
Get Multiple Quotes: Compare at least three contractors before deciding.
Buy Materials in Off-Season: Prices drop in late fall and winter.
Use Basic Materials: Vinyl siding and asphalt shingles cost less than premium options.
If you’re planning a custom garage for your property, professional builders can help you make the most of your budget.
Converting Between Garage Types
Already have one type but want the other? Converting a detached garage to an attached one is possible but expensive.
Converting Detached to Attached:
This major project involves:
- Building a connecting structure or breezeway
- Extending utilities from your home
- Matching rooflines and siding
- Getting new permits
Expect costs of $15,000 to $50,000, depending on the distance between buildings.
Impact on Home Value
Both garage types add value to your property, but in different ways.
Attached Garages: Most buyers prefer the convenience. Homes with attached garages sell faster and often command higher prices.
Detached Garages: Appeal to buyers wanting workspace or who value privacy. They’re popular in rural and suburban areas.
Either option provides a good return on investment when you sell your home.
Making Your Decision
Think about these key questions:
- What’s your total budget, including permits and site work?
- How do you plan to use the garage daily?
- Does your property have enough space for a detached garage?
- What do similar homes in your area have?
- Do you need workshop space away from your house?
Your answers will point you toward the right choice. For many homeowners, the lower Cost and convenience make attached garages the smart pick. Others value the flexibility and separation of a detached structure.
Working With Professional Builders
Whether you choose attached or detached, work with experienced contractors. They can:
- Give accurate cost estimates for your property
- Handle permits and inspections
- Spot potential problems before construction starts
- Finish the job on time and on budget
Quality construction matters more than saving a few dollars. A well-built garage lasts decades with minimal maintenance.
If you’re planning other home additions or residential construction projects, consider how your new garage fits into your overall plans.
Final Thoughts
Building an attached garage saves you money upfront, typically costing 10% to 15% less than a detached option. The shared wall, easier utility hookups, and reduced building materials make it the budget-friendly choice.
But the cheapest option isn’t always the best. Think about how you’ll use the space, your property layout, and your long-term plans. A slightly more expensive detached garage might serve your needs better and add more value to your home.
Ready to start your garage project? Contact us for a free quote and expert advice on the best garage type for your property and budget. Our team will help you make a smart choice that fits your needs and saves you money.