What’s an ADU? Why they’re popular in 2025
An ADU, or Accessory Dwelling Unit, is basically a fully functional small-scale house. These are small
homes but complete in every way, including essential features like a kitchen, bedroom, and bathroom.
The trend of ADUs actually started growing during the time of COVID, when people began facing a lack
of workplaces and financial resources. In such a situation, ADUs proved to be very beneficial for people
from all professions. In 2025, this ADU trend has increased even more.
- Garage Conversion ADU
Do you also have a garage at home that is rarely used or completely wasted? If yes, you can convert it
into an Accessory Dwelling Unit (ADU).
This idea is currently very popular and beneficial because it’s more affordable. You get to use your own
space for a useful purpose that benefits you directly. It doesn’t require heavy construction, and getting a
government permit is much easier compared to a regular house. Adding this small ADU instantly
increases your home’s value.
Space-saving ideas:
In these ADUs, you can use foldable furniture (like a bed that hides in the wall), build built-in storage,
and use smart lighting and mirrors to make the small space look bigger and more beautiful. Sliding doors
are a better option than regular doors in ADUs.
Approx. cost (Mayson County):
Usually $60,000 to $120,000.
The price mainly depends on garage size, plumbing/electric upgrades, permit fees, and the finishing
quality.
LM Stevens Design can help assess if your garage qualifies for a legal conversion and handle the entire
design-to-permit process. - Detached Backyard ADU
Basically, this is an independent building constructed separately in your home’s backyard.
Do you have empty backyard space that’s not being used properly? If yes, you can turn it into a
Detached ADU and make the most out of it.
Benefits:
The biggest benefit is that you get a fully private space where you can do anything—use it as a co-
working area or a guest house, it’s completely your choice. Plus, it significantly boosts your home’s
resale value.
Space-saving ideas:
➤ Loft-style bed to save space underneath for living area
➤ Open shelves and under-stair storage for smart organizing
➤ Sliding glass doors to let in natural light
➤ Compact bathroom fixtures for more room
Approx. cost (Mayson County):
Usually $100,000 to $250,000
As mentioned earlier, the cost depends on:
➤ Size of the unit (400–800 sq ft
➤ Utility hookups (water, sewer, electric)
➤ Design complexity
➤ Permits and landscaping
Pro Tip:
LM Stevens Design helps homeowners like you turn unused backyard space into beautiful, fully
permitted ADUs. Reach out today for a site review or a custom design consultation.
- Over-Garage ADU
Imagine turning the unused airspace above your garage into a sleek studio or a cozy one-bedroom flat.
That’s exactly what an Over-Garage ADU offers.
Over-Garage ADUs come with many benefits. You get a completely separate entrance and a private
upstairs space, which makes it perfect for rental income or a guest suite. Plus, you get to enjoy a nice
elevated view every day. It’s a smart way to add functional space without using extra ground area.
Approx. cost:
Usually $150,000 to $300,000
Cost depends on:
➤ Whether the garage already exists or needs to be built
➤ Structural support and engineering work
➤ Staircase, plumbing, permits, and design quality
LM Stevens Design will assess your current garage and provide custom design plans that are permit-
ready and beautifully efficient.
Ready to explore this idea? Let’s talk.
- Two-Story ADU
Need extra living space but don’t want to give up your backyard?
A Two-Story ADU could be the perfect solution.
A Two-Story ADU is a small building built on two floors, usually in the backyard. The ground floor
typically includes the kitchen and living area, while the upper floor has the bedroom and bathroom. It
gives you more space without taking up much ground area.
This type of ADU is great for rental income, a guest house, or even for grown-up kids. It looks stylish and
also increases your home’s resale value.
Design ideas:
You can add a spiral staircase or slim stairs to save space. Skylights and big windows make the interior
feel more open and brighter. Built-in shelves help with storage, and a small balcony or outdoor deck
adds charm and functionality.
Approx. cost:
Around $200,000 to $350,000
LM Stevens Design can help you design a beautiful and efficient Two-Story ADU, customized to fit your
space and needs—from start to permit.
Ready to Build Your Ideal ADU in 2025?
Whether you’re planning to add a cozy guest suite, earn rental income, or just need extra space for your
growing family—ADUs are one of the smartest home upgrades in 2025. They offer flexibility, privacy,
and major value boosts to your property.
From garage conversions to stylish two-story builds, today’s ADU designs are more efficient, elegant,
and customized than ever. And the best part? You don’t have to figure it all out alone.
LM Stevens Design, with over 50 years of architectural excellence in Mayson County, is here to guide
you—every step of the way. We’ll help you:
Explore the best ADU design ideas for your space
Navigate local permits and building code
Create a 3D design and floor plan that fits your lifestyle
Turn your vision into a legal, livable, and lasting space
Call us today at 360 227-9861 or
Email at lmsdesignsllc@gmail.com to get started with your ADU project consultation.
Let’s design something smart, beautiful, and perfectly you.