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Zoning Permit

The second most important permit is the zoning and land use that needs to be filed by a commercial building services Washington. This review is a baseline for lot size and coverage, height, changes in current structure, parking requirements and street access.

Utility Connection Permit

Since a DADU is a separate entity from the main structure of the property, separate utility needs to be provided. Commercial subcontractor Seattle has to file for water, sewer, electrical permits which might include lateral lines, side sewer connections, electrical paneling and storm drain water compliance.

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Trade Permit

Some counties require separate permits for electrical, plumbing and mechanical systems. However, some counties allow bundling of these permits with the main permits explained above. Therefore, a building subcontractor Washington with experience and proper knowledge will save you time and money by applying for the correct permits with the exact documentation required.



Now, coming to the three counties where these questions are asked the most!

King County

·   SDCI manages all DADU permits and offers a fast track for pre-completed applications. This is something United Seattle has expertise in which helps in shortening the review time.

·   The energy code becomes strict in King County, where United Seattle's groundbreaking AeroBarrier technology comes into play.

·   Tree protection plans are required for plantations near the construction site. This is one of the most overlooked areas in the permit application process.

·   Sewer capacity charges apply for new dwelling units, and those must be reviewed by the King County Wastewater Division.

Snohomish County

·   PDS issues all the permits with a special septic review for non-connected sewer systems.

·   Design reviews are required in some cities to match the architectural heritage.

·   Some neighborhoods do not approve of second driveways and therefore, it needs to be catered to in the design phase.

·   WUI zones may ask for fire-resistant construction material which again has to be pre-planned 

Pierce County

·     Pierce County Planning & Public Works approves the DADU permits with additional strictness in the hilly neighborhoods.

·     Fire department clearance is additionally required for emergency access

·   Stormwater drainage reviews are more rigorous in Pierce County than in other areas.

·   Utility coordination may require working with Tacoma Power and Tacoma Public Utilities, which have their own timelines and application processes separate from city permits.

Where Does United Seattle Come In?

Working with a commercial subcontractor Seattle who understands the inspection schedule is key to avoiding work stoppages. This is especially where the expertise of United Seattle in the DADU construction area comes in. They assist you with permit-ready drawings, utility permit coordination, advising on local code variations, sequencing the whole process and being there for you every step of the way. The delay in time for the permit process can be used as an asset if the commercial construction subcontractor Seattle is an experienced company with loads of DADU construction under their belt.

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