The Mobile/Manufactured Home Permit Submittal Checklist is the Snohomish County Planning and Development Services (PDS) checklist of the items a standard mobile/manufactured home permit application must contain to be treated as complete under SCC 30.70.040. Applicants complete the checklist and submit it as part of their Residential Building Permit (RBP) application, marking any item that does not apply as "N/A". On this page you can fill out the form online on FillingPDF and download or print the completed PDF; the county publishes the original checklist and its permit forms at snohomishcountywa.gov.
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What is Mobile/Manufactured Home Permit Submittal Checklist – Snohomish County, WA?
The Mobile/Manufactured Home Permit Submittal Checklist is the Snohomish County Planning and Development Services (PDS) checklist that lists the documents and information needed for a complete standard mobile/manufactured home permit application. PDS verifies completeness against it before accepting the application for further processing.
The checklist has ten numbered submittal items: site plan; wetland worksheets for sites with wetlands; critical area study; tie-down and foundation installation plans; model-specific floor plan; the Mobile/Manufactured Home Plan Review Specification form; drainage submittal packet; water/sewer letter; drive access permit; and submittal fees. Items that do not apply are marked "N/A", with the rationale discussed in the narrative when needed.
It also carries two reference notes. One quotes the county's corner clearance standard for access to residential corner lots (section 2-05 of the Engineering Design and Development Standards 2003). The other lists criteria for mobile homes in zones R-7200, R-8400, R-9600, T, NB, CB, GC, CRC, RU, R-12,500 and WFB (30.22.130(6)); those criteria do not apply to structures considered "manufactured" homes.
This is a checklist, not the permit application itself. The application is a Residential Building Permit (RBP) for a Mobile/Manufactured Home, filed through the PDS Permit Portal. The checklist refers to separate documents, including the Residential Site Plan Submittal Checklist and the Mobile/Manufactured Home Plan Review Specification form. The Director of PDS may waive individual requirements case by case for site-specific or project-specific circumstances. The printed revision is dated July 16, 2025.
Who needs to file Mobile/Manufactured Home Permit Submittal Checklist – Snohomish County, WA?
Applicants for a standard mobile/manufactured home permit in Snohomish County complete and submit this checklist as part of their application. The county states that the items on it are required to determine a complete application under SCC 30.70.040.
Conditions that change what you provide:
- Sites with wetlands add wetland delineation field worksheets and wetland categorization worksheets (item 2).
- Development in critical areas or their buffers requires a critical area study (item 3).
- New single-family residences or duplexes (installation or conversion of a mobile/manufactured home) require a water and sewer availability letter (item 8).
- New or modified access to a County maintained road requires a Drive Access/Culvert Permit (item 9).
- New or replaced hard surface on a property outside a subdivision with a previously reviewed drainage plan requires a drainage plan (item 7).
Projects that need approvals other than a building permit have additional submittal requirements. The checklist names an Administrative Conditional Use Permit (for example, temporary dwellings), a Shoreline Variance or Shoreline Development Permit, a Forest Practices Permit or Land Disturbing Activity Permit, and Flood Hazard Permits in the 100-year floodplain. The list is not comprehensive; consult PDS staff if you think you need other approvals.
When to file Mobile/Manufactured Home Permit Submittal Checklist – Snohomish County, WA
Complete the checklist when you prepare your Residential Building Permit (RBP) application for a mobile/manufactured home, and submit it with that application. The checklist prints no separate due date. PDS verifies completeness before accepting the application for further processing.
Before you submit, check whether your project needs other permits, such as an Administrative Conditional Use Permit, a Shoreline Variance or Shoreline Development Permit, a Forest Practices Permit or Land Disturbing Activity Permit, or Flood Hazard Permits in the 100-year floodplain. Those carry their own submittal requirements. If your site has no address, ask the PDS Addressing Specialist to assign one before you apply. The county's checklist page lists 425-388-3311 for questions.
Documents you need
- Site plan drawn to a standard engineer's scale (1" = 10', 20', 30', 40', 50', 60', 100' or 200') with all information listed on the Residential Site Plan Submittal Checklist.
- Sites with wetlands only: wetland delineation field worksheets (see WAC 173-22-035) and wetland categorization worksheets based on the latest edition of the Washington State Wetland Rating System for Western Washington named on the checklist.
- Critical area study, for development activity or action requiring a project permit in critical areas and/or their buffers (SCC 30.62A.140), including effective impervious surface calculations.
- Tie-down and foundation installation plans, available from the manufactured home dealer, showing sizing and spacing of footings and blocking at perimeter, frame and marriage lines.
- Model-specific floor plan with dimensions, layout of rooms, doors, windows and point loads at the marriage line; the dealer can provide it.
- Mobile/Manufactured Home Plan Review Specification form, completed and signed.
- Drainage submittal packet if you add or replace hard surface and your property is not in a subdivision with a previously reviewed drainage plan; the type depends on the square footage.
- Certificate or letter of water and sewer availability from the local purveyor, for installation or conversion to a NEW single-family residence or duplex.
- Drive Access/Culvert Permit application (Right of Way Type D1), only if you need new or modified access to a County maintained road.
How to fill out Mobile/Manufactured Home Permit Submittal Checklist – Snohomish County, WA
Check whether other permits apply
Before filling anything in, review the list of other approvals on page 1: Administrative Conditional Use Permit, Shoreline Variance or Shoreline Development Permit, Forest Practices or Land Disturbing Activity Permit, and Flood Hazard Permits. Consult PDS staff if unsure.
Gather parcel number and address
Find your tax parcel number on your tax statement, or call (425) 388-3433 or visit the County Assessor's office. If the property has no address, ask the PDS Addressing Specialist to assign one.
Mark item 1, the site plan
Check the line for item 1 once your site plan is drawn to a standard engineer's scale and includes everything on the Residential Site Plan Submittal Checklist.
Complete items 2 and 3
For item 2, mark the wetland delineation and categorization worksheets if your site has wetlands, otherwise write N/A. For item 3, mark the critical area study if you develop in critical areas or buffers.
Mark items 4 and 5
Item 4: tie-down and foundation installation plans from the dealer, with footing and blocking sizing and spacing. Item 5: the model-specific floor plan with dimensions, rooms, doors, windows and point loads at the marriage line.
Complete and sign the Plan Review Specification
Item 6: fill out and sign the Mobile/Manufactured Home Plan Review Specification form, then mark the line.
Select the drainage submittal for item 7
Choose the drainage plan that matches your new plus replaced hard surface square footage, or write N/A if you add none or your subdivision has a previously reviewed drainage plan.
Handle items 8 and 9
Item 8: attach the water/sewer availability letter for a new single-family residence or duplex. Item 9: mark the Drive Access/Culvert Permit if you need new or modified access to a County maintained road; otherwise N/A.
Acknowledge submittal fees in item 10
Mark item 10 to confirm you understand the site review fee, base fee, technology surcharge and other review fees are collected at submittal. See Bulletin #18 for calculation details.
Review the zone notes
Read the Important Note and the corner clearance standard on page 3 to see whether the criteria for your zone apply to your home. They do not apply to "manufactured" homes.
Review and download the completed PDF
Check that every item is marked or shows N/A with a rationale in the narrative. Download or print the completed PDF from FillingPDF and upload it with your application as described under How to submit.
How to submit Mobile/Manufactured Home Permit Submittal Checklist – Snohomish County, WA
The checklist is submitted online as part of the Residential Building Permit (RBP) application for a Mobile/Manufactured Home, filed through the PDS Permit Portal.
- PDS Permit Portal: Submit the RBP application through the portal described on the county's Online Permitting page. The county's checklist page at https://snohomishcountywa.gov/1438/Checklists says checklists that must be uploaded appear in the dropdown menu of the "Upload Documents" phase of the online application.
- Drive access permit: If you need one, submit a Right of Way Type D1 Drive Access/Culvert Permit application online through the same portal.
- Fees: A site review fee, base fee, technology surcharge and any other applicable review fees (for example critical areas, drainage/stormwater, or Health Department water/septic fee) are collected at submittal, plus an access permit fee if required. Amounts are not printed on the checklist; see Residence Building Permit Fees – Bulletin #18 or ask PDS.
- Questions: For your tax parcel number, call (425) 388-3433 or visit the County Assessor's office. For an address assignment, contact the PDS Addressing Specialist at (425)388-3709 or [email protected]. General questions: 425-388-3311.
FillingPDF lets you fill out and download the PDF; submission follows the county channels above.
Common mistakes to avoid
- Drawing the site plan at a scale other than the standard engineer's scales listed (1" = 10' through 200'), or omitting information required by the Residential Site Plan Submittal Checklist.
- Leaving an item blank instead of writing "N/A" and explaining the rationale in the narrative when it does not apply.
- Skipping the water/sewer availability letter for a new single-family residence or duplex; the checklist says it is required.
- Submitting the wrong drainage tier: 1 to 1,999 sq. ft. Small Project SWPPP, 2,000 to 4,999 sq. ft. LDA with Targeted Stormwater Site Plan, 5,000+ sq. ft. LDA with Full SWPPP and Drainage Plan.
- Not contacting staff when clearing more than 7,000 sq. ft., grading more than 100 cubic yards, or working in critical areas without adding 2,000 sq. ft. of hard surface.
- Submitting the Mobile/Manufactured Home Plan Review Specification form unsigned or incomplete.
- Not checking for other required permits (conditional use, shoreline, forest practices, land disturbing activity, flood hazard) before submitting.
- Using a private easement for access without first verifying you have rights to it.
- Applying the zone criteria in the Important Note to a structure considered a "manufactured" home; notes A) through E) do not apply to those.
Frequently asked questions
What is the Snohomish County Mobile/Manufactured Home Permit Submittal Checklist?
It is the Snohomish County Planning and Development Services (PDS) checklist of items required for a complete standard mobile/manufactured home permit application under SCC 30.70.040. You complete it and submit it with your Residential Building Permit application; PDS checks completeness before accepting the application.
Is this a Snohomish County property tax form?
No. It is a building permit checklist, not one of the Snohomish County property tax forms. The only tax link is that you need your tax parcel number, printed on your tax statement; the County Assessor's office or (425) 388-3433 can help you find it.
Where do I submit the mobile/manufactured home permit application?
Submit a Residential Building Permit (RBP) application for a Mobile/Manufactured Home online through the PDS Permit Portal. The county says checklists that must be uploaded appear in the dropdown of the portal's "Upload Documents" phase. For questions, call 425-388-3311.
Do I need a water and sewer letter for a manufactured home?
Yes, for installation or conversion of a mobile/manufactured home to a NEW single-family residence or duplex. Get a certificate or letter of availability from the local purveyor, such as the PUD or Alderwood Water District. Properties using a well go through the local Health District for the well permit.
What drainage plan does the checklist require?
It depends on new plus replaced hard surface: 1 to 1,999 sq. ft. needs a Small Project SWPPP; 2,000 to 4,999 sq. ft. needs a Land Disturbing Activity Permit with a Targeted Stormwater Site Plan; 5,000+ sq. ft. needs an LDA permit with a Full SWPPP and Drainage Plan. Subdivisions with a reviewed drainage plan are excepted.
What do I write if an item does not apply to me?
Write "N/A" on that item and, where needed, explain the rationale in the narrative. The checklist's instructions say to do this for any item that is not applicable to your project.
Is there a fee when I submit the application?
Yes. A site review fee, base fee, technology surcharge and other applicable review fees are collected at submittal, plus an access permit fee if required. The checklist does not print amounts; see Residence Building Permit Fees – Bulletin #18 or contact PDS.
Do the zone criteria on page 3 apply to manufactured homes?
No. The criteria for zones such as R-7200, R-8400 and RU cover mobile homes and require things like multi-section design, a pitched non-metallic roof, and wheels and tongue removed. The checklist says notes A) through E) do not apply to structures considered "manufactured" homes.
Can I fill out this checklist online on FillingPDF?
Yes. You can fill out the PDF online on FillingPDF and download or print it. FillingPDF is an independent service and does not submit anything to Snohomish County; you upload the checklist through the PDS Permit Portal with your application.
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