Water Supply to Detached Garage/Living Space

philwgreenApril 16, 2013

Love the site and have learned so many things reading through the forum over the years. Finally had a question of my own. About to start work on a garage with living space above it and wanted to get everyone's opinion on getting water out to the new building.

Main house was built in 1949. House is one story on a hill with a walk out basement under about 1/3 of the house. The rest is crawl space. I spent some time this last week digging (always fun in a crawl space) to get a better idea of the current plumbing setup. Here's what I know.

Main line into the house is 3/4. That line passes to the back half of the house about 18" below grade about 30'. There are 1/2" branches as it passes my kitchen (sink, ice maker), hall bath (lab, toilet shower/tub), laundry and master bath (double lav, toilet, shower). At the end of that run is the tankless water heater and the 3/4" hot line runs back to the front of the house with 1/2" branches at the same locations (master bath, laundry, hall bath and kitchen.)

My question is two-fold.

Our GC and plumber want to tee off the end of the cold line, near the water heater, and run 3/4" to the new structure (about 50' away). In my head it makes more sense to tee off where the 3/4" enters the house and send one side to the main house and one side to the new building. I don't have any science/facts to back up that assertion - it just seems to make more sense to me - but then again I'm not a plumber. I'm just getting the impression from the GC/Plumber that their way would be 'easier' but I don't know if it's better or correct.

The second part of that question: is 3/4" even large enough to carry that many fixtures? The new building will have one bath (lab, toilet, shower).

Any help/advice would be greatly appreciated.

Thank you for reporting this comment. Undo
Sophie Wheeler

Contact your local utility about separate utility services for the detached building. You will need a separate sewage hookup and supply as well as a separate gas supply if that is planned. On a separate meter. That is if local codes even allow a separate detached living quarter. Many do not, to keep people from violating the single family zoning for the property. They don't want people creating rentable structures.

    Bookmark   April 20, 2013 at 1:14PM
Sign Up to comment
More Discussions
what brand water softener
have 2400 sq ft rancher on town water. do not have...
Fleck 5600 Econominder - Salty Tasting Water
I just installed a new 1.5 cu ft water softener with...
Under counter water filters…again
I've lurked here for over a year and have learned so...
Costco Water Ridge Dual Flush -- Need reviews
Any more reviews on the dual flush Water Ridge toilet?...
Water softener decision for Austin, Texas city water
I want to better protect my plumbing from wear and...
Sponsored Products
s: 1-Light 70 in. Bronze Finish Amber Glass CLI-C61173
Home Depot
Fanmats NHL 60 x 96 in. Utility Mat - 10626
$134.99 | Hayneedle
Braun Wrist Watch - White Face/Mesh Strap - BN32WHSMG - Braun
$200.00 | HORNE
Raleigh Sofa
Design Within Reach
Clara 22-inch Indoor/ Outdoor Throw Pillows with Sunbrella Fabric (Set of 2)
Florence Style Loft Armchair Loveseat and Sofa Set Leather 3 Piece Set in Tan
$2,369.00 | LexMod
© 2015 Houzz Inc. Houzz® The new way to design your home™