Can You Build an ADU on a Beach Front Property?

Dustin Edwards • August 30, 2023

Accessory dwelling units (ADUs) can provide a number of opportunities for investors, both experienced and new. Beach city rentals are always in demand, which makes building ADUs to add to your real estate portfolio for an additional income incredibly alluring. 


While in most beach cities, there are limits to the size and location of your ADU. There are different
challenges when building an ADU on a beachfront property.


In today’s article, we’ll review the challenges of building an ADU on a beachfront property to see if you can increase your passive income.


Understand your Zoning

Different municipalities have different regulations that must be followed. For example, in Long Beach, ADUs are allowed in all areas zoned for single-family detached housing except for r-3-t and r-4-m, which typically refer to multi-family residential zoning. However, this can change depending on where you are building. It can also significantly affect how wide or tall the ADU can be.


For ADUs built on beachfront properties in California, you also need to be aware of the coastal overlay zones. These zones are often protecting beaches and ocean access points. This can limit your project and options when building in or near these zones. Because these areas are protected, there will likely be more regulations and restrictions when building an ADU on a beachfront property.


While building an ADU on the coastal overlay zones is possible, permits may be more expensive and require more time to process. Some locations on the coastal overlay zones make it unlikely that you will be allowed to build on them. These include:


  • Very High Fire Hazard Areas
  • Wildland Urban Interface Site
  • Hillside Overlay zones
  • Bluff Top Sites
  • Environmentally sensitive habitat areas


Getting the Right Permits

Assuming you’ve already had your ADU designed and drafted, you'll next need to request your building permits. For ADUs built on coastal overlay zones, you'll need more than the typical building permits. You also need a coastal development permit. This means you’ll need two reviews before starting the project. You'll need the standard review required for every ADU in California and the coastal department review for ADUs built on the coastal overlay zone. With some luck, these will happen simultaneously, which can save time. However, this isn’t always the case.


Start Building

Once everything is done with the city and you are allowed to build, purchase the proper material for the job. To ensure the longevity of the new building, it's best practice to keep in mind that you are building on the coast, and many factors can affect the maintenance required in the future. Nearly every surface must be abrasion-resistant as the sand can chip away at wood, metal, and even scratch glass. The salt and moisture can quickly work out of most metals if unprotected. Hardwood decks constructed of cedar, redwood, and ipe are commonly used due to their rot resistance, though they should still be treated regularly to maximize their lifespan. Composite materials such as fiberglass, PVC, and concrete are famous for building near the coast.


Building an ADU on the coast can seem like too much for some people, but the reward of having a second beautiful rental that can provide you with great passive income for years to come is worth it for those who go through with it. If you need help understanding the coastal zones and how to build on them or help
manage your current beachfront property, we invite you to call us today at (562) 888-0247 or fill out our Owner Application online.

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By Dustin Edwards June 6, 2025
With the real estate market as competitive as it is, many landlords are looking into building an Accessory Dwelling Unit (ADU) or Jr. ADU to improve their bottom line with additional monthly income. While this is a great way to earn more, you need to be sure you’re investing in the right upgrade to your property. Below are some of the key differences between ADUs and Jr. ADUs; this way, you can make the right decision for your property. Differences between Junior ADUs and ADUs On the surface, the primary difference between an ADU and a Jr. ADU is the square footage. However, there are many considerations for each type of ADU , significant differences include costs and build limitations. ADUs are generally seen as a larger and more versatile build when compared to a Jr. ADU. They can be built detached from the main home, converting an existing structure, most commonly the garage. In Long Beach, an ADU can be up to 800 square feet or 50% of the gross floor area of the primary dwelling, whichever is smaller. For reference, an 800 sqft living space can be arranged as a 2-bedroom 1-bath home, though with creative use of the space, many investors have been able to fit 2 bedrooms and 2 bathrooms comfortably. If listing the ADU for rent is the goal, this can produce a higher yield, though at the cost of a higher initial investment. Jr. ADU, on the other hand, can only be a maximum of 500 sqft and must be built attached to the existing single-family home. While you can build an entire new addition to accommodate the Jr. ADU, it's not uncommon for homeowners whose homes are bigger than they need to convert a bedroom into a Jr. ADU in order to have additional income . A Jr. ADU does still require an efficient kitchen. Bathrooms can be shared with the main house, though this can deter some prospective tenants. Additionally, the utilities are oftentimes shared with the main house, which can simplify installation, though it can complicate utility costs with your tenant. When an ADU is Right Being able to build a full ADU provides an entirely separate and private living space, which is more desirable to prospecting tenants. This is the preferred choice for most investors, especially those who have unused space in their property. By being built apart from the main house, an ADU may cause less disturbance to those living in the main house, whether that be yourself or another tenant. In Long Beach, CA. ADUs can’t be listed as short-term rentals on apps like Airbnb; that being said, an ADU can command more in rent because of the aforementioned features. If you’re looking for a long-term investment, ADUs increase your property’s value while generating a consistent cash flow. Finally, if you ever plan on selling your rental property, the additional ADU can improve the appeal of your property to future buyers. When a Jr. ADU is Right While a Jr. ADU doesn’t have the same potential as a full-sized ADU, Jr. ADUs are far more budget-friendly. These are a great option for investors who have limited funds. Since Jr. ADUs generally require less work to be done in less time, allowing you to begin making a return sooner. Finally, if your property doesn’t qualify for a full-sized ADU permit due to the size of the property lot, a Jr. ADU can be built primarily through interior work, which may only require reconfiguring existing interior space. Whether you choose a full-sized ADU or a Jr. ADU, the decision depends on more than just the size of the structure, you’ll have to manage filling the vacancy and managing the new tenant. If you need help choosing which ADU is right for you or you need help managing your Beach City rental property, we invite you to call us today at (562) 888-0247 or complete our Owner Application online .
By Dustin Edwards May 30, 2025
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