Home Addition vs. ADU: Which Is Right for Your Property?

As families grow, lifestyles change, and housing demands shift, homeowners often find themselves facing a big question: Should I add onto my existing home, or build an accessory dwelling unit (ADU)? Both options can increase livable space and boost property value, but they serve different purposes and come with unique considerations.

Below, we’ll break down the pros and cons of each to help you decide which approach might work best for your needs—and your property.

What’s the Difference Between a Home Addition and an ADU?

A home addition expands the footprint of your existing house. It can be anything from a new bedroom or sunroom to a second-story extension or a larger kitchen. A home addition contractor in MA like Provost Companies can help guide this process from design through construction.

An ADU (Accessory Dwelling Unit) is a standalone or semi-detached unit—like a garage apartment, basement suite, or backyard cottage—that typically includes a separate entrance, kitchen, and bathroom. It’s designed to function as an independent living space.

Pros of a Home Addition

✅ Seamless Integration – Additions are designed to feel like a natural extension of your existing home.
✅ No Zoning Surprises – In many towns, zoning for additions is more straightforward than for standalone units.
✅ Keeps the Household Together – Ideal if you’re expanding for your own growing needs (vs. for rental income).
✅ Boosts Square Footage and Value – Adds value while keeping the house under one roof.

Cons of a Home Addition

🚫 Can Be Disruptive – Construction often occurs right next to your daily living areas.
🚫 Requires Thoughtful Design – A poorly designed addition can throw off flow or curb appeal.
🚫 Less Flexible Use – Additions are usually tied to the main home, which can limit their use as income-generating or independent spaces.

Pros of an ADU

✅ Independent Living Space – Great for aging parents, adult children, or rental income.
✅ Privacy for Everyone – ADUs give both parties their own space and entry.
✅ Flexibility – Rent it out, use it as a guest house, or convert it into a home office.
✅ Future-Proofing – ADUs are in high demand and can significantly increase property value.

Cons of an ADU

🚫 Zoning & Permitting Can Be Tricky – Not all Massachusetts towns allow ADUs, or they may have strict rules.
🚫 Higher Upfront Costs – Building a fully independent structure requires its own plumbing, HVAC, etc.
🚫 Takes Up Yard Space – Detached ADUs reduce open outdoor areas.

Which One Is Right for You?

If your goal is to simply expand your current home’s functionality—such as adding a bedroom, expanding your kitchen, or creating a bigger family room—then a home addition in Massachusetts may be the most practical route.

On the other hand, if you want flexibility, rental income, or a multigenerational living solution, building an ADU could be a smarter long-term investment.

Need Help Deciding? Let’s Talk.

Every property and family is different. The best way to determine whether a home addition or an ADU is right for you is to talk with a trusted local expert. Provost Companies is an experienced general contractor in Stoughton, MA, ready to walk you through zoning, design, and build options from start to finish.

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