TRUSTED LOCAL ADU EXPERTS

Custom ADUs Built for Your Property

Expand Your Living Space with a Professionally Built Accessory Dwelling Unit

From design to construction, we build high-quality ADUs that add value, functionality, and long-term flexibility to your home.

Family Owned & Operated

22+ Years of Experience

Fully Licensed & Insured

Free ADU Consultation & Quote

High-Quality Materials & Craftsmanship

Owner On-Site for Every Project

Up to 20-Year Workmanship Warranty

Financing Options Available

22+ Years of Experience

100% Satisfaction Guaranteed

Owner On-Site for Every Project

Up to 20-Year Workmanship Warranty

High-Quality Materials & Craftsmanship

Financing Options Available

22+ Years of Experience

100% Satisfaction Guaranteed

Custom ADU Design & Construction Services

We design and build accessory dwelling units (ADUs) that are functional, durable, and tailored to your property and goals.

Standalone living spaces perfect for rental income, guest homes, or private living quarters.

Seamlessly integrated additions that expand your existing home.

Convert unused garage space into a fully functional living unit.

Comfortable, private living spaces for family members or guests.

Built for Long-Term Value

We are not the cheapest option and not the fastest and that’s intentional.

ADUs require proper planning, permits, and construction to ensure safety, durability, and long-term value.

We focus on building high-quality units that are done right the first time.

Why Homeowners Choose McCarthy Exteriors

Building an ADU is a major investment. We focus on doing it right the first time.

Proven expertise building high-quality decks and exterior projects.

Personal service and accountability on every project.

Hands-on oversight ensures consistent quality from start to finish.

We prioritize quality materials and proper installation over shortcuts.

Up to 20-year workmanship warranties plus manufacturer warranties.

Affordable monthly payment options available.

Our ADU Building Process

1

Consultation & Planning

We discuss your goals, property, and ADU options.

2

Design & Permitting

We guide you through design considerations and approvals.

3

Professional Construction

Our in-house team builds your ADU with precision and care.

4

Final Walkthrough

We ensure everything meets our standards and your expectations.

Trusted for Quality Construction

Homeowners choose us because we deliver high-quality work and stand behind every project.

"Definitely recommend Tyler and his guys! Did really good work, showed up and even cleaned up really well daily! But what really stood out to me was the way him and his guys were great about explaining everything they were doing in a way I could understand it, which made me feel so much better about the whole project from start to finish. Can't say enough about these guys! Wish I found them sooner!"

- Chris Attaya

"Tyler and his crew were awesome to work with. They were efficient with all their work and materials and left a fantastic finished product. I would highly recommend them to any family or friends for any of their projects."

- Larry Bruno

"I had a fantastic experience working with Tyler McCarthy from McCarthy Exteriors. Tyler maintained excellent communication throughout the entire project, always keeping me informed and promptly addressing any changes that arose. His attention to pricing was impressive, and he consistently provided me with options to manage costs effectively."

- Kristi Legere

Ready to Add Space and Value to Your Home?

Whether you’re building for rental income, family, or extra space, we’re here to help.

Schedule Your Free ADU Consultation!

Free design consultation

No pressure, no obligation

Expert guidance from start to finish

Proudly Serving Southern New Hampshire

©2026 McCarthy Exteriors, LLC

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