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It’s typically less expensive to buy a garage-building kit than to build a garage from scratch if you’re supplying all the labor. However, unless you are an experienced builder, you will still need to hire pros to install the foundation, concrete floor, and add electrical and plumbing to your garage kit. In that case, it’s worth the investment to build a garage through a local garage builder who can coordinate the hiring of other necessary pros.

Adding a detached garage can increase the home's value by a healthy amount, provided it's well-constructed, permitted, and inspected. The return on investment for a detached garage depends on the structure's size and function, as well as its quality. On average, consumers who add a detached garage can expect their home's value to increase by between $12,000 and $36,000. 

Most contractors aim for about a 20% profit on a job, leaving themselves room for unexpected expenses or delays. After accounting for materials, labor, and insurance, the profit margin for most contractors is between 10% and 20%. Fluctuating costs of materials and labor affect the ultimate percentage.

If you're handy, you may want to take on building a garage as a do-it-yourself project. However, whether it's a good idea to build a garage on your own or not depends on the type of structure you want to build and local permitting laws. If you want to work with a pre-fab structure, you may be able to DIY. However, if laying a foundation is involved, you're better off working with a professional builder.