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Commercial Construction & Renovation in Southern NH

603 Contracting provides high-quality commercial construction, renovations, and tenant improvements for businesses across Southern New Hampshire. Whether you need a full build-out, a storefront upgrade, or association property work, our team delivers professional results with clear communication and minimal disruption to your operations.
Call us today to start your project: (603) 324-0507
Outdoor porch project
Yellow house finished

Commercial Construction & Renovation Services

Why Businesses Choose 603 Contracting

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Proven Commercial Experience

We have worked with well-known brands, retail chains, and business owners throughout Southern New Hampshire.
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Efficient & Reliable Execution

We understand commercial project timelines and work efficiently to meet deadlines while minimizing business disruption.
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Clear Communication & Project Management

Our structured approach ensures smooth coordination between property owners, corporate teams, and our construction crew.
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Full-Service Solutions

We manage every aspect of the project, including permits, inspections, and compliance with industry regulations.

Our Clients

Here are just a few of the brands we've worked with:
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Let's Discuss Your Project

Every commercial project is unique. Whether you need a small renovation or a large-scale build-out, we’re here to help. Contact us today to schedule a consultation and get started on your commercial construction needs.
Get in Touch
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Our Financing Partnership

Need Help Financing Your Project?

Looking to renovate or build but not sure how to pay for it? 603 Contracting has partnered with Elite Mortgage Group to help you explore financing options using the equity in your home. It only takes a few minutes to find out how much you qualify for—and what your monthly payments could look like.
Check Your Home Equity Options