Services and Mains

Natural gas installation for new construction.

NW Natural will install gas service to your new residential or commercial building using conduit installed by a builder or excavator.

Natural gas services

  • We will install the service within seven business days of receiving your order.
  • Request gas service after the conduit has been installed properly in a trench; the trench has been backfilled and at least two feet of upright conduit has been inserted to mark the ends of the buried conduit.
  • NW Natural provides conduit free of charge at our resource centers. Visit the Conduit page for conduit placement requirements and information about conduit pickup availability.
  • Once the gas service has been installed and the house piping has passed inspection, contact NW Natural to order the gas meter.

As of Jan. 1, 2015, NW Natural will no longer install services in an open trench provided by the owner, builder or developer. We have eliminated this option to reduce erosion problems, conflicts with local regulations and timing issues that sometimes resulted in wasted trip charges.

Natural gas mains

NW Natural will install main in a trench provided by the developer/contractor within a subdivision.

  • See trench specifications for details of trench construction.
  • The trench must be padded with 12 inches of select or clean native backfill material to separate other utilities from the natural gas pipeline.
  • Contact NW Natural at least seven business days before the pathway is available for main installation.

Note: These specifications assume that no sewer, water, storm drains or other wet facilities will be located in a trench with natural gas mains. In the case of exceptions, contact NW Natural as early as possible.

To help with coordination and planning, NW Natural will:

  • Provide a sketch of proposed gas mains within the subdivision.
  • Make conduit material available for pickup if needed.
  • Provide gas-only road crossings in existing public right-of-way, unless other utility crossings are planned.
  • Make all necessary tie-ins.
  • Will begin main installation within seven business days* after trench inspection and approval by NW Natural.

Note: NW Natural may need to visit the site prior to start of installation in case of unusual work conditions. If the installation requires a permit to work in a public right-of-way easement, start of work will depend on receipt of necessary documentation. Locates are required, and work will begin after the locates are complete.

Required/recommended steps prior to main installation include:

  • The developer/contractor must submit a copy of the civil engineering designs and a copy of the electric designs to NW Natural before NW Natural agrees to provide service.
  • NW Natural recommends an on-site meeting with representatives of all utilities before construction begins. NW Natural will design its infrastructure to parallel the electrical facilities whenever possible, as gas installations typically shadow other utilities and can be installed in a joint trench. However, NW Natural may require additional trenching.
  • Once all designs have been submitted, NW Natural will provide the developer with a sketch of the required gas facilities and street crossings. Upon request, NW Natural will provide a location where the developer’s contractor can pick up conduit for the crossings.
  • The developer/contractor must notify NW Natural at least seven business days before excavation of the joint trench.
  • The developer or contractor should call four days prior to shading to set the inspection date.
  • NW Natural will begin installing the main within seven business days of the date the trench is approved by a NW Natural representative.