Question about plumbing a detached garage

[aunsafe2015]

Assume detached garage is behind my house, about 30 feet away from the main sewer line in the basement of my house. If I want to add a bathroom to the detached garage, could I just run the sewer line from the detached garage into the basement of my main house and connect it to the sewer line there?

Or would I have to bypass the house and connect it to the sewer line in front of my house?

I've googled this and I saw one site that said the sewer line from an outbuilding cannot go into the main house, and must connect to the house's sewer line somewhere outside of the house. In my case, that would presumably be somewhere in my front yard, and that would be problematic because I would have to destroy (or tunnel under) my permeable paver driveway to get there. Whereas, if I could run it straight from the detached garage to the basement of my house, it would be relatively simple.

I'm in Virginia, if it matters.

Thanks in advance for any feedback.

 

[larry4406]

I did exactly as you described, Fauquier County VA about 15 years ago.

Core drilled foundation wall of house, brought detached garage sewer lateral into house foundation, turned down into house stack, which then connected to house ground works and out to septic field it went.

Some of the health/building departments may frown on this as they think you are trying to add additional bedrooms etc to your property. I recall one poster on this site who had to demo a basement bath in order to add one for his detached garage, house on public sewer.

 

[pgray007]

I have a lift tank at the detached, which pumps up grade a bit to the house sewer. This was done when the house and garage were built in SC.


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[aunsafe2015]

Thanks to both of you for the replies.

Are both of your garages and plumbing setups permitted and inspected?

If so, I guess that gives me hope, because it would at least mean that there is no universal code rule against connecting the outbuilding plumbing into the basement of the main house (unless code has changed since then)!

 

[rburke65]

No em petulance here....in the trades but no plumber....I don't see a problem with connecting it to the house.

 

[LS6 Tommy]

Is the neighbor's waste line closer?































Tommy

 

[pgray007]

Yes, I was permitted twice, and it’s been inspected and passed twice (once when the house/detached was built and the waste line and lift tank were installed and only serving a slop sink, and once after adding a bath and shower, vanity, and bar sink).

We’re under IPC down here in SC without many funny amendments that I recall. It does seem that plumbing is a bit more variable between jurisdictions, as I’d find something that was the “right” approach in one part of the US and a potential portal into Satan’s domain in another.

I did find my local building department very helpful for random inquiries. Just ring them up or swing by and ask as they’re the final answer anyway.


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[larry4406]

Yes mine was inspected and permitted

 

[aunsafe2015]

Is the neighbor's waste line closer?





























[emoji38]2:

Tommy

Hah hah!

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[kbs2244]

This is a local code issue.
One mile difference can be "go/no go"

 

[01-7700]

Gawd, I loved living in the no code zone.

 

[aunsafe2015]

This is a local code issue.
One mile difference can be "go/no go"

I know. I thought it might be a universal no go though, so it's good to know it's not.

I've actually got a plumber coming over today. I'll see if he knows for certain one way or the other what code permits in my area.

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[larry4406]

When you talk to the plumber, make sure you vet his approach to cutting thru the foundation wall and water proofing the penetration. Many ways to do this, some more leak prone than others.

I used a expanding seal. Resembles rubber links of a chain. Link size and number of links chosen based on the core drill size and pipe OD. At the link pins are bolts which get tightened in a star sequence radially expanding the link and sealing the gap. Sorry can't remember the name of this seal.

 

[Jackfre]

Will it work? Yes, if the grade is correct or if you get a sewage ejector to pump it up. Just be aware that when it come time to sell the house, if you intend to, if it doesn't fit the letter of the law it has/should to be disclosed. If done neatly, it may slide by any inspections.