What is an Attached ADU?

In Massachusetts, an Attached ADU (Accessory Dwelling Unit) is a livable home of no more than 900sf built on the same lot as your primary residence.

The difference is in the name. Attached means the ADU is built onto or within the existing home. This is commonly referred to as an ADU attached to a house, and it often includes its own kitchen, bathroom, entrance, and utility connections.

These are sometimes called in-law apartments, basement apartments, or guest houses. No matter what you call them, they serve the same purpose. More space. More flexibility. More long-term value.

Why Worcester Homeowners Are Building Detached ADUs

• Earn rental income
• Make room for aging parents or family
• Boost resale value
• Add living space without touching the main house

Our Process for Designing Detached ADU Plans

VIACAD, LLC designs attached ADU plans that meet code and match the vision you have for your property.

Our ADU Design Services

• Basement conversions
• Garage to living space
• Rear or side home additions
• First-floor in-law apartments
• Studio rentals
• One-bedroom layouts
• House plans with attached ADUs
• Attached ADU floor plans

Whether you're planning for income, family, or future flexibility, we help you build whatever your next chapter needs.

Here is how we make it happen:

1. You reach out with your address and project goals
2. We research zoning, setbacks, and the attached ADU requirements specific to your property in Worcester
3. We meet in person to walk the property and better understand your vision
4. We design plans that align with code and your goals
5. You review and approve the layout before we finalize
6. We deliver a set of plans that gets your project rolling

Every project is unique, but we make the process simple. VIACAD, LLC has over 18 years of local experience, across Massachusetts, designing residential & commercial plans that move from concept to construction.