Aging in Place: Designing a DADU for Accessibility and Comfort

Building for Today and Tomorrow

A DADU designed for aging in place serves current needs while anticipating future ones. Whether you’re building for aging parents right now or planning ahead for your own future, incorporating accessibility features from the start costs a fraction of retrofitting them later. In King County, where the 65+ population is growing rapidly, accessible DADUs are both a family solution and a smart investment.

Universal Design Principles for DADUs

Universal design means creating spaces that work for people of all ages and abilities. These features benefit everyone — not just seniors.

Entry and Access

Zero-step entry: At least one entrance with no step — a ramp or flush threshold. Essential for wheelchair access and helpful for anyone carrying groceries.
Wide doorways: 36-inch minimum throughout (standard is 32 inches). Small upgrade, big impact.
Lever door handles: Easier to operate than knobs for anyone with reduced hand strength.
Covered entry: Protection from rain while unlocking the door — Pacific Northwest essential.
Well-lit paths: Motion-activated lighting from parking to entry.

Single-Level Living

Everything on one floor: Bedroom, bathroom, kitchen, and living space all accessible without stairs.
This is the most important aging-in-place feature — stairs become the primary barrier as mobility changes.
See our single-story vs. two-story guide for design considerations.

Bathroom

Curbless shower: Walk-in or roll-in access. No step to trip over. The gold standard for accessible bathrooms.
Grab bars: Installed at shower, toilet, and tub (if included). Install blocking in walls during construction even if you don’t install bars immediately — adding them later is easy if blocking exists.
Hand-held shower head: Adjustable height, usable seated or standing.
Built-in shower bench: Fold-down or permanent bench for seated showering.
Comfort-height toilet: 17–19 inches (vs. standard 15 inches). Easier to sit down and stand up.
Non-slip flooring: Textured tile or slip-resistant flooring in wet areas.

Kitchen

Varied counter heights: Some sections at standard height (36″), some lower (30–32″) for seated work.
Pull-out shelves: In lower cabinets — no bending or reaching into deep cabinets.
D-shaped cabinet pulls: Easier to grip than knobs.
Side-opening oven or wall oven: Avoids bending and reaching over a hot door.
Good lighting: Under-cabinet lighting and bright overhead lighting for safety.

Throughout the DADU

Wide hallways: 42 inches minimum (36 absolute minimum). Allows wheelchair or walker passage.
Rocker light switches: At 42–48 inches height. Easier to operate than toggle switches.
Outlets at 18 inches: Higher than standard — reduces bending.
Smooth flooring transitions: No thresholds or level changes between rooms.
Non-slip flooring: LVP, textured tile, or low-pile carpet throughout.

Technology for Aging in Place

Smart home integration: Voice-controlled lights, thermostat, and door locks reduce physical demands.
Video doorbell: See and communicate with visitors without opening the door.
Emergency alert system: Pre-wired for medical alert devices.
Robust Wi-Fi: Supports telehealth appointments, video calls with family, and smart home devices.

Cost of Accessibility Features

Most accessibility features add minimal cost when included in new construction:

Wide doorways: $0–$500 additional (specify during framing)
Curbless shower: $500–$2,000 additional vs. standard shower
Grab bar blocking: $100–$300 (just wood blocking in walls during framing)
Lever handles: $0–$200 (same price as knobs in many product lines)
Zero-step entry: $500–$3,000 depending on site grading
Total accessibility package: $2,000–$8,000 additional — a tiny fraction of the total DADU cost

Compare this to retrofitting an existing home for accessibility: $20,000–$50,000+. Building it in from the start is dramatically cheaper.

APEX DADU Designs for Every Stage of Life

We incorporate universal design principles into every DADU we build — because smart design serves everyone. APEX DADU creates homes that work beautifully today and adapt gracefully as needs change.

Contact APEX DADU to discuss accessible DADU design