Custom ADU Layouts Built for Real Properties
Not every ADU should start with a floor plan.
At Amex Construction, we build custom stick-built ADUs based on your property, your family’s goals, and the real site conditions that shape the project. Layout, lot access, drainage, septic capacity, utility routing, grading, and foundation scope all affect what kind of ADU actually makes sense. That is why we start with feasibility first and design the right path from there.
If you are comparing ADU ideas, the better question is not “Which plan do I like best?”
It is “Which ADU layout actually works for my property?”
Call or text Amex Construction today to schedule a free ADU feasibility review.
ADUs Are Not Catalog Homes
A true ADU is not something most homeowners should pick out of a lineup.
An ADU is usually tied to a major family decision:
making room for parents
giving adult children more independence
planning for caregiving or aging in place
adding flexible living space
creating long-term value on the property
That means the project should be shaped around the people using it and the land supporting it.
At Amex Construction, we do not sell pre-packaged ADUs. We build custom stick-built ADUs that fit the property and the purpose of the space.
Start With the Property, Not the Plan
Before choosing a layout, we look at the issues that actually drive the project:
Where can the ADU realistically sit on the lot?
How will drainage and grading affect the build?
Does the property have septic or sewer?
Can the existing septic system support the added use?
How will utilities reach the new space?
What foundation and excavation work will be required?
Does the lot support a detached ADU, attached ADU, or conversion better?
That is the difference between shopping and planning.
Common ADU Types We Build
Detached Backyard ADUs
A detached ADU gives the most privacy and flexibility, but it also requires the most site planning. Placement, utilities, drainage, foundation work, and septic impact all need to be evaluated early.
In-Law Suites
A strong option for multigenerational living, caregiving, and long-term family flexibility. These projects need the right balance of privacy, accessibility, and practical site planning.
Garage-Related ADUs
Garage-based projects can work well on some properties, but they still need to be evaluated based on structure, layout, utilities, access, and zoning.
Basement or Interior Conversions
Some homeowners already have usable square footage and want to turn it into independent living space. These projects can be efficient, but they still need real feasibility review.
Family Expansion ADUs
Some projects do not fit into a simple category. They are built around how the family wants to use the property over time. That is where a truly custom layout matters most.
How We Help You Choose the Right ADU Layout
We do not ask you to pick from a catalog first.
We help you narrow the right direction by looking at:
family use
privacy needs
lot size and layout
building placement
septic or sewer conditions
site access
utility routing
drainage and grading
construction complexity
long-term flexibility
The result is a layout direction that actually fits the land instead of fighting it.
ADUs on Septic Need a Different Starting Point
If your property is on septic, layout decisions affect more than just the building.
Bedroom count, system capacity, Title 5 implications, and potential upgrades can all change what kind of ADU makes sense. That is why septic review should happen before a homeowner gets attached to a floor plan.
Amex Construction is built for that process. We handle excavation, site work, septic coordination, utilities, drainage, and construction as one connected project.
What Makes Amex Different
A lot of companies sell the framed structure first and leave the hard property questions for later.
Amex takes the opposite approach.
We control the parts of the job that usually create the biggest problems:
excavation
site prep
foundations
grading
drainage
underground utilities
septic coordination
custom stick-built construction
That gives homeowners a more realistic path from idea to finished ADU.
Our Process
1. Free Feasibility Review
We review the property, likely layout options, site conditions, utilities, drainage, and septic implications.
2. Project Direction
We identify the ADU type and layout direction that makes the most sense for the lot and intended use.
3. Site and Infrastructure Planning
Excavation, foundations, utility routing, grading, drainage, and septic upgrades are addressed early.
4. Construction
Your ADU is built as a custom stick-built project tailored to the property.
5. Completion
The structure and site come together as one usable, long-term addition to the property.
Frequently Asked Questions
Do you offer standard ADU floor plans?
We build custom stick-built ADUs. Some layout ideas can serve as a starting point, but the final direction should be based on the property and the intended use.
Can you help me figure out which ADU type fits my lot?
Yes. That is exactly what the feasibility review is for.
What if my property is on septic?
Then septic capacity, layout, and possible upgrades need to be part of the conversation early.
Do you handle site work too?
Yes. Excavation, drainage, utilities, grading, and foundation work are a major part of what makes Amex different.
Can I still build a detached ADU if my property has site constraints?
Possibly. The answer depends on the lot, the infrastructure, and the scope. That is why the property should be evaluated first.
Request a Free ADU Feasibility Review
If you are comparing ADU layouts, start with the property first.
Amex Construction helps Massachusetts homeowners choose the right ADU type based on real site conditions, family needs, septic or utility constraints, and what it will actually take to build the project the right way.
Call or text Amex Construction today to schedule your free ADU feasibility review.