How To Run Plumbing To A Detached Garage

How To Run Plumbing To A Detached Garage
  • Author: Amanda Arnold
  • Posted On: March 8, 2022
  • Updated On: September 26, 2023

You have a significant undertaking on your hands, whether you’re adding a toilet and shower to your garage as part of a larger redesign or want to make your utility room more efficient. The most difficult problem you’ll have is drainage, especially if your garage is located downhill from any available sewer connection.

Running utilities might be expensive or highly cost-effective depending on numerous circumstances, such as the garage’s foundation or the distance between your water main and your garage. Here are some things to think about when figuring out how much this job will cost and how to run plumbing into your garage.

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Is It Essential To Get A Permit To Run Plumbing To A Detached Garage?

Well, you don’t need to get a permit in all cases to run plumbing to a detached garage. A permit is nearly necessary to construct something new or make significant changes to an existing building or structure.

What would necessitate permission is entirely up to your city’s or municipality’s approving body. There is no universally applicable general rule. As a result, the only way to acquire the correct answer is to ask the approving authority in your region.

Adding a bathroom to a detached garage necessitates constructing a room, installing utility lines, and doing other tasks. Because plumbing is involved, adding a bathroom to a detached garage nearly usually necessitates a permit.

Steps To Install Plumbing To A Detached Garage

You can surely use a detached for storage and even a guest room. You’ll need to run underground water lines to your detached garage if you want to add a bathroom or shower room to your garage for some revamp or renovation. New water line installation might be a major, costly project or a low-cost option.

Create A Plan

Following the determination of the quote, the plumber and homeowner must establish a plan of action. The plumber will select which of your home’s major plumbing lines to connect to and will walk you through the entire process.

Start Digging For New Pipe’s Installation

A plumber or plumbing team will begin drilling holes in the garage foundation, outside ground, or even within your home to make way for new pipes.

Add Plumbing Fixtures

After the excavation is complete, the plumber will begin constructing the plumbing system in the detached garage by adding fixtures, pipes, values, and ventilation. Depending on the style of home, garage, and homeowner’s expectations, each detached garage project is unique.

If cost is a concern, ask your professional plumber for advice on reducing the overall cost of the plumbing installation.

Check with your licensed plumber about local plumbing rules during the initial pricing process to avoid code penalties after the job is completed.

What Are The Main Factors To Consider While Running Plumbing To A Detached Garage?

For many homeowners considering this renovation, the first question that comes to mind is: how much will it cost? A plumber’s quote for running plumbing to your detached garage may be affected by several things. Consider the following points:

Depth And Garage Foundation

If your garage foundation is concrete, it will surely add up more plumbing cost. The reason is that plumber will require more time to drill or dig concrete as compared to other materials. However, you can choose alternative methods to reduce plumbing cost for concrete floor.

Secondly, the depth of main sewer line will also have a great impact on the overall plumbing cost. If the main sewer line is deeper than usual, it will surely add more cost to overall plumbing project.


In case of having an insulated garaged, there will also be heaters. In plumbing or adding a new pipeline, you have to work more technically because of heaters.

No doubt, heaters can supply hot water more efficiently than installing hot water lines. So, you don’t need to remove it. But you have to deal with it technically. More technicalities mean high costs!

Pipe’s Material

The plumbing cost also varies in each project based on used plumbing pipes. So, you have to choose piping material according to your budget.

Installation Of Ventilation System

In the case of installing a plumbing system, you will also need to install an appropriate ventilation system. The main reason to install appropriate ventilation is to save your garage from moisture and mold because of the plumbing system.

Garage’s Layout Also Matters

If the garage is detached or apart from your home, you will need to spend more time and budget to install plumbing lines to a detached garage. Moreover, the cost will increase if the plumbing is already not closed appropriately in your home.

That’s why if the addition of plumbing lines is not renovating or revamping your home, there is no need to waste your money or time. However, you will need to install plumbing lines to add a bathroom to a detached garage.

Final Thoughts

Hopefully, this article will help you focus on all factors to consider before installing a plumbing line to a detached garage. You can also add plumbing lines yourself by following discussed steps.

However, hiring professionals or plumbers for this task would be great. Several factors determine the final cost of home renovation projects. To minimize surprises once the project begins, ensure the skilled plumber answers all of your questions before leaving.

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Author: Amanda Arnold

Amanda has been working with ConstructionHow since 2021. Her experience spans over 5 years in the creative niche such as home decor and trends, landscaping, renovations, and custom architectural values. As a home designer expert, she has a keen eye for the latest home improvement trends with accurate facts that readers find impossible to ignore. Being invested in home-building trends is how she has gained her lucrative expertise exploring more to bring a positive ambiance for all homeowners (and even tenants!). Currently, she lives in a beautiful beach home, a source of fascination for her.