From Site Prep to Siding: How to Plan an Efficient DADU Construction Project

Viktor Zherdiev • August 1, 2025

With construction-friendly laws aimed towards helping people build DADUs in already built homes or properties, the demand for a good commercial subcontractor Seattle has skyrocketed. This is when even GCs are looking for an efficient commercial construction subcontractor Seattle to hand over their usual projects. However, not any construction management subcontractor can just come in and get a DADU done. Without research and experience, a construction management subcontractor might remain stuck in the permit process altogether. Therefore, we at United Seattle have come up with a blueprint that any homeowner, commercial construction subcontractor Seattle or GC in Seattle should follow to get a DADU done right the first time and without unnecessary delays.

Site Evaluation (2-3 weeks)

This is the first and most important step where every wrong call has implications throughout the project for a commercial subcontractor Seattle. Checking out local laws, codes, permit processes, utility access, geography, current building restrictions and design flaws all fall into this category. The more detailed a site evaluation is, the easier it gets for a construction subcontracting services Seattle in the long run.

The Permit Process (6-10 weeks)

This is where most of the time is spent due to inexperience and a lack of understanding of the local laws. The key to solving this slow-moving mystery is detailed knowledge of the system and a checklist that has everything that needs to be done or submitted. Now this is a lengthy process so some of the tasks coming later in the project are aligned by a smart commercial subcontractor Seattle to save this null period time. Efficient construction management subcontractors use this permitting window to prep, not pause.



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Site Prep (1-2 weeks)

This might be one of the smallest phases in the DADU construction project. However, an inexperienced commercial subcontractor Seattle can stretch this to a time where the project seems impossible. Excavation needs equipment and the right equipment for the right job is to be planned earlier at the site inspection phase. Furthermore, the current construction and neighborhood need to be catered for by the building subcontractor Washington before the first trench is dug. Working with construction management subcontractors who understand trenchless methods and local soil conditions can eliminate major headaches.

 

Foundation: The First Important Concrete Step (1 week)

There are a number of pre-made or site-developed options for laying the foundation. However, it mostly depends on the site and the kind of overhead construction involved. A smart commercial subcontractor Seattle will keep the GC / client in the loop from the design phase, explaining the reason for every choice. This hugely avoids any disputes in the future where the groundwork is done but now requires changes because a specific type of foundation was not informed about!


The Framing (2-3 weeks)

This is where all the fun work starts and the client sees the structure standing up finally. Smart construction subcontracting services Seattle aim for tandem working of teams so that there is no lag period in between. The same goes for delivery of materials, which should reach just before they are needed rather than earlier or later which has its own cost-bearing consequences. Framing for a typical 500–800 sq ft DADU takes 2 to 3 weeks, and staying on schedule requires material staging and clear communication with crews.


The Dry Envelope (203 weeks)

With Seattle's unpredictable weather a solid weatherproof envelope is a must. Therefore, the materials for windows, doors, roof and siding must all be selected keeping the weather in mind. This is where a local like United Seattle beats the competition as they have the knowledge and latest patent AeroBarrier technology for keeping your home insulated and reducing the living cost as well. 


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By Victor K February 18, 2026
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By Victor K February 10, 2026
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