The following information must be submitted when applying for this kind of permit. Since every project is unique, there may be some situations where you will be asked to provide additional information.
- Completed Building Permit Application
- Four sets of complete Construction Drawings, including Site, Architectural and Structural plans as listed in our Additions Submittal Guidelines handout.
- Erosion control plan (may be a part of the site plan) or completed simple site erosion control form, if the project will result in ground disturbing activity. Note: Erosion control measures shall be installed, even when a simple site erosion control form has been accepted.
- Mitigation form and/or a stormwater manual if your project will add more than 500 square feet of impervious area
- Completed Residential Energy Efficiency Additional Measures Requirements form
- Completed Residential Fixtures Worksheet for Additions or Remodeling, if you will be applying for Plumbing, Electrical, or Mechanical permits at the same time.
- If lot slope exceeds 20%, a geotechnical engineering report prepared by an engineer registered in the State of Oregon is required.
- Cesspool or Septic System information, as indicated below.
To submit for a permit, bring the above materials along with intake fees to the Development Services Center.
If you are hiring sub-contractors to do work on your project, and know who they are when applying, they will be listed on your permit at that time. If you don't know when you apply for your permit, they can be added after issuance. Sub-contractors you hire must be registered with the State ofOregonand carry a current CCB license.
THINGS TO CONSIDER
(1) Included work, such as an Attached Garage or Additional Floor
If your project will include the addition of a garage, please also see our page on Garage, Shed and Accessory Structures for special requirements.
Additional requirements may apply if the scope of work includes converting existing unfinished space to living space, or adding a dormer or additional floor to the house. Please refer to the summary page for more information.
(2) Residential Engineering
Your project must be designed to meet all structural requirements in the building code. The construction drawings must show how both gravity and lateral (wind and earthquake) loads will be resisted. Please see our page on Residential Engineering for more information on these requirements.
If your house is located in a floodplain, there are restrictions that may limit your ability to add to or significantly improve your house without retrofitting it to be flood-resistant. Please contact Site Development staff at (503) 823-6892 to discuss your project.
(4) Decommissioning a Septic Tank or Cesspool
When enlarging the footprint of an existing structure, septic tank/cesspools must be located and shown on the site plan.
- Visit the records staff at the Development Services Center to research plumbing records showing septic systems/cesspools
- If the septic system/cesspool has been decommissioned, and is within 10 feet of the new structure, you must sign a disclaimer for on-site-sewage disposal system form
- If the septic system/cesspool is within 10 feet of the new structure and has not been pumped and filled, it will need to be decommissioned
Call Environmental Soils staff at (503) 823-6892 for more information on decommissioning septic tanks and cesspools.