Is an ADU Right for Your Property? Here’s What to Know First.

Aug 4

Accessory Dwelling Units (or ADUs) have become a hot topic in residential design — and for good reason. Whether it's a detached guest cottage, a converted garage, or a modern backyard studio, these small-but-mighty structures can add space, flexibility, and even rental income to your property.

But before you start dreaming up a Pinterest-perfect tiny home, it’s important to understand what’s actually possible — especially here in the Triangle.

What is an ADU, Exactly?

An ADU is a secondary housing unit on a single-family residential lot. It might be:

A detached backyard cottage
An apartment above a garage
A basement or lower-level conversion
A space over a detached garage

These units can be used for long-term family stays, aging parents, guests, home offices, or rental income — and they’re often a smart investment if designed and permitted correctly.

Can I Build One in Cary, Raleigh, or Apex?

The short answer: it depends.

Local zoning rules vary across municipalities — some are embracing ADUs with open arms, while others still have tight restrictions. Raleigh has taken big steps forward recently to loosen requirements, allowing detached ADUs on most single-family lots without needing a rezoning. Cary and other nearby towns are moving more cautiously.

Key factors include:

Lot size and zoning designation
Setback and height limitations
Access and utility connections
Owner-occupancy requirements
Parking requirements

We can help you determine if your property is eligible — and more importantly, whether it’s worth it from a design and investment standpoint.

Design Considerations

Designing an ADU isn't just about squeezing a tiny home into your backyard. It should:

Complement the main home in style and scale
Feel private (for both you and your guests or tenants)
Use space efficiently — every square foot matters
Maximize natural light, views, and outdoor connections
Stay flexible: today’s guest suite might be tomorrow’s home office

As architects, we work with homeowners to balance function, aesthetics, and code — and design something that adds long-term value to your home and lifestyle.

Cost & Process

In our experience, a well-designed detached ADU in this area typically ranges from $175K–$350K+, depending on size, finish level, and site conditions. It's a serious investment — but one that can pay off through rental income or added resale value.

Our Feasibility Study process helps answer the big questions up front:

Can I build one on my lot?
What size and type make sense?
What’s the likely cost and timeline?
Are there design or permitting hurdles?

We’ll even give you 3D visuals to see how it could look and feel on your property before committing to full design and permitting.