When a Connecticut family builds an ADU for aging parents, the goal is not just square footage — it is independence, safety, and dignity. An ADU that is designed thoughtfully for aging in place is a completely different project from one designed purely for rental income. The choices you make at the design stage will determine whether your parents can comfortably live in that space for 10, 15, or 20 years — or whether you are back in front of a contractor in three years making expensive modifications after a fall or a health change.
Here is how Lagace Construction approaches ADU design for families in eastern Connecticut who are building for aging parents — and the specific features that make a real difference.
Start with Universal Design Principles
Universal design is the practice of creating spaces that work for people across the full range of human ability and mobility — not just people with current disabilities, but people at every life stage. A universally designed ADU works well for a healthy 65-year-old today and continues to work as mobility changes. The added cost of building these features in from the start is a fraction of what it costs to retrofit later.
Zero-Step Entry
This is the most important feature to get right. A zero-step entry — no stairs, no threshold step, a smooth transition from outside to inside — is the difference between an ADU your parent can use independently and one that requires assistance every time they enter or exit. This matters even if your parent is healthy and mobile today. By the time a step becomes a hazard, it is already a fall waiting to happen.
Achieving zero-step entry requires planning the ADU grade carefully so that exterior doors open to a level landing at the same height as the interior floor. For basement ADUs, this typically requires a walk-out at grade level. For additions, it means designing the foundation and floor framing to meet grade without a step. This is much easier to accomplish at the design stage than as a retrofit.
Wide Doorways
Standard interior door widths of 28 to 30 inches are adequate for most people but become a barrier for anyone using a walker, wheelchair, or rollator. Universal design calls for a minimum of 36-inch clear opening at all doorways, including bathrooms. At 32-inch rough opening, a standard door becomes 29 to 30 inches clear — too narrow. Specify 38-inch rough openings throughout to achieve the 36-inch clear opening standard.
This costs almost nothing extra at framing stage. It costs significantly more to widen doors after drywall, tile, and trim are installed.
The Bathroom: Roll-In Shower and Grab Bars
The bathroom is statistically the most dangerous room in any home for older adults — and in an ADU designed for aging in place, it deserves serious design attention.
A roll-in shower (also called a curbless or zero-threshold shower) eliminates the step or curb that makes traditional showers a tripping hazard. The floor slopes gently toward a linear drain, with no barrier to stepping in. Pair this with a fold-down shower bench and a handheld showerhead on an adjustable slide bar, and you have a shower that works well for anyone regardless of mobility.
Grab bars should be blocked and installed at the toilet (one each side), inside the shower, and outside the shower entry. Specify blocking in the walls during framing — 3/4-inch plywood backing behind the drywall in the grab bar locations — so bars can be mounted anywhere in the future as needs change. Retrofit grab bar installation into unblocked walls requires finding studs or using specialized anchors; it is inferior and more expensive.
Lever Door Handles and Single-Lever Faucets
Round doorknobs require grip strength and rotation — both of which decline with arthritis. Lever handles can be operated with a closed fist or elbow. Specify lever hardware throughout the ADU at no meaningful cost premium. Similarly, single-lever kitchen and bathroom faucets are far easier to operate than two separate hot/cold handles.
Single-Floor Layout
All living functions — bedroom, bathroom, kitchen, and living area — should be on a single level. Multi-level ADUs with sleeping lofts or split-level designs are appealing architecturally but become inaccessible when stairs are no longer manageable. Keep the layout entirely on one floor, and make sure that floor is accessible from outside at grade or via a minimal-slope ramp.
Lighting
Older adults need significantly more light than younger people to see clearly. Design the ADU with higher lighting levels throughout — particularly in the bathroom, kitchen workspace, and at exterior stairs if any exist. Night lights in hallways and bathrooms are essential. Specify light switches with large paddle-style rockers rather than small toggles, and consider motion-activated lighting in the bathroom for nighttime safety.
Emergency Features
Consider rough-in for a future medical alert system or smart home monitoring. A 120V outlet inside the bathroom at a reasonable height allows for a medical alert base unit. Ensure the ADU has reliable cell signal — test this before construction is complete. Some families install a dedicated emergency call button in the bathroom and bedroom that connects directly to the main house.
These Features Do Not Have to Look Clinical
One of the most common concerns we hear from families is that they do not want the ADU to look like a hospital room. The good news is that thoughtful universal design does not have to look institutional at all. Curbless showers are a standard feature in luxury bathrooms. Lever hardware is a design staple. Wide doorways are barely noticeable in a well-designed space. The goal is a beautiful, comfortable home that happens to be safe — not a medical facility.
The Emotional Case for Getting This Right
Building an ADU for your parents is about more than construction. It is about keeping the family close while preserving your parents’ independence and dignity. When the space is designed well, your parent can have their own kitchen, their own bathroom, their own entrance, their own routines — while you are twenty steps away. That proximity is a safety net that enables independence, not one that undermines it.
Lagace Construction has built in-law ADUs for eastern Connecticut families throughout Coventry, Tolland, Andover, Hebron, Glastonbury, and surrounding communities. We understand that these projects are personal, and we bring that understanding to every design conversation.
Call us at (860) 933-2700 to talk about what a well-designed ADU for your parents would look like and cost. We will help you build something that works for the next 20 years, not just the next 2.
Lagace Construction — Building in Eastern Connecticut Since 2001. Licensed CT New Home Construction Contractor #NHC-0016939.
