Costs for building an DADU in Seattle

Victor K • Sep 02, 2023

A simple Google search by any commercial subcontractor Seattle about the cost of building a DADU (Detached Accessory Dwelling Unit) in Seattle will give a range between $250,000 to $550,000. However, the range can gallop below or above or stay within depending upon several factors. Today we discuss these factors for any person reading to have a good insight into what kind of a bank-breaking structure they are looking at (or not) with this new construction.

 

What Is A DADU?

Before we lunge into the factors affecting the price which are also the prerequisites of a DADU construction, we look at what is a DADU. DADU (Detached Accessory Dwelling Unit) is a separate unit detached from the main house whereas ADU (Accessory Dwelling Unit) is attached to the main house and accessible from inside.

 

Your choice not only depends upon the current structure but also on your aspirations and requirements while discussing it with your building subcontractor Washington. If you prefer to avoid a complicated construction project involving a detached structure, you can opt for a simpler solution by renovating existing space to build an ADU. For example, you could transform your basement into a guest suite.

 

The advantages that come along with a DDU include increased living space for family members and/or home office, the potential for additional income through long/short-term rentals, enhanced property value and tax rebates.

 

Factors Affecting the Cost of DADU

Basic six factors affecting the cost of a DADU addition in your existing property for Seattle, include:-

 

Plans & Design

The first and foremost thing affecting the cost is the design (interior and exterior) of the DADU. A lavish-designed DADU with high-cost wall paper and additional washroom accessories with an island bath would be a fortune. However, a smart building subcontractor Washington will play inside the allocated budget and get the desired result.

 

Building Codes and Associated Fee

This is something that is beyond the control of any of the parties involved in the design and construction process. Permit fees cover various components including site inspections, zoning assessments, and environmental reviews. Allocating a reasonable estimate of $10,000 to $20,000 for these permits and fees is advisable.




Construction Cost

The construction cost is again highly dependent upon the design and material used. However, a generic range any construction management subcontractor will quote will be between $200 to $400 per square foot. The lower limit might be a good guess but the higher limit depends upon the material used by the building construction subcontractor Washington.

 

Utility Connections

For your DADU, essential utility links for water, sewer, and electricity are needed. Extending connections from your property or existing residence could incur extra expenses, ranging from $5,000 to $10,000+, based on distance and potential infrastructure enhancements.

 

Extra Budget

As a standard rule, all commercial construction project management Seattle goes over and beyond the budget for a variety of reasons. Therefore, always keep a 10-15% additional budget margin owing to unforeseen expenses once the construction starts.

 

Final Verdict

Therefore, if you are looking to add space to your home, extra revenue or tax rebate, a DADU is an ideal construction as opposed to a full-blown renovation. However, factors like Architectural plans and design, construction cost, utility connection cost, and additional unforeseen expenditures must be catered for before commissioning such a project. However, companies like United Seattle ensure that proper feasibility is carried out before the first dollar bill is spent.

 

Furthermore, if you are looking for benefits of a design build approach, then this old blog here will assist you in making an informed decision.

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