Building an ADU is not a cheap adventure. However, it doesn’t have to be overly expensive either. Here is the average ADU cost of construction for you to reference.
Hiring A Contractor
The first thing to keep in mind when thinking about how much it will cost just to construct the ADU is who will be constructing it. If you have experience with building and can build an ADU yourself, you will save a ton of money in this phase. However, if you need to hire someone, who you hire will greatly determine how much you will pay.
A tip of advice, don’t hire the cheapest contractor. They often cost you more in the long run due to inexperience that leads to mistakes and hidden fees. Your best bet is to go with a contractor who is local to your area and familiar with ADUs. They should also have a list of references you can check to verify that they do a good job.
The Scope Of Work
The complexity of your design, as well as the size of the ADU, will also impact the price. The simpler you design, the cheaper the construction.
However, this also includes things out of your control like whether or not you need to run a new sewage line or electricity and how difficult that will be. Along with whether or not the property is relatively level and easy to dig into.
Type Of ADU You Build
The type of ADU you build will greatly impact your construction price. Conversions are almost always cheaper than constructing a new ADU from the ground up. That is if the original structure is in good shape.
Materials You Use
The other main factor of your cost will be the materials you choose to use in order to construct the ADU. If you opt to use cheaper materials, this may result in your ADU not holding up as well, so be sure you do not give up too much quality for cost.
If you can, try to get bulk deals from local suppliers to help cut down on costs.
Cost Of Construction
The cost of ADU construction varies based on multiple factors. However, building a conversion ADU is between $175.00-$225.00 per square foot, and building a new construction ADU is between $250.00 to $300.00 per square foot.