Legacy

Built,

Sheet Metal Contractors Inc.

Family-owned and union-based, SMCI embodies a Legacy Built and Future Focused approach — delivering trusted HVAC and sheet metal craftsmanship throughout De Soto, St. Louis, and Jefferson County.

Future

Focused

Commercial

Services

Mechanical Design Build

Legacy Built, Future Focused—Sheet Metal Contractors Inc. Mechanical Design-Build services unite innovation and craftsmanship to design smarter, more efficient mechanical systems built to stand the test of time.

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Architectural Sheet Metal

SMCI’s Architectural Sheet Metal team crafts durable, custom metal solutions that combine form and function. From roofing and façades to canopies and custom details, we bring precision and artistry to every project.

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Sheet Metal Roofing

Trusted by contractors and owners alike, SMCI’s Sheet Metal Roofing team designs, fabricates, and installs high-quality roofing systems that stand up to the toughest conditions while enhancing curb appeal.

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Plan and Spec

With a proven record of precision and performance, SMCI’s Plan-and-Spec team brings engineered designs to life—executing projects with accuracy, efficiency, and total compliance to plans.

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24 Hour Emergency Service

When the unexpected happens, SMCI is ready. Our 24-Hour Emergency Service team is on call day and night to restore comfort, safety, and system performance for our customers.

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Commercial Custom Ductwork Fabrication

Sheet Metal Contractors Inc. continues to elevate that standard with the introduction of our new Vicon Coil Line — an advanced fabrication system designed to enhance the quality, consistency, and efficiency of every piece we produce.

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Behind

The Brand

Built on Family Values

Sheet Metal Contractors, Inc. was founded in 1980 by Lawrence P. “Larry” Krodinger, Sr., whose vision was to build a company rooted in craftsmanship, integrity, and hard work. After years in the mechanical and heating industry, Larry took a leap of faith to start his own union heating and air conditioning business. What began with just four employees has grown into a trusted, full-service mechanical contractor with more than sixty full-time team members serving commercial and residential clients across the region.  What started as one man’s dream has become a multi-generational commitment to excellence. Larry’s daughter, son, and grandson continue to build upon his foundation — honoring the legacy he started while driving SMCI toward a future of innovation and growth. At SMCI, our past is our foundation and our future is our focus — a company truly “Legacy Built, Future Focused.

Industry

Expertise

Educational Facilities

SMCI’s Mechanical Design-Build, Architectural Sheet Metal, and Plan-and-Spec services deliver comfort, efficiency, and craftsmanship to schools across the region.

Municipal & Financial Institutions

From government facilities to financial centers, SMCI’s integrated mechanical and sheet metal solutions support comfort, control, and operational stability.

Restaurants & Hospitality

Our team blends mechanical performance with architectural detail—creating efficient HVAC systems and custom metalwork that enhance both function and design.

General Portfolio

SMCI’s General Portfolio highlights our diverse capabilities in Mechanical Design-Build, Architectural Sheet Metal, and Plan-and-Spec projects—delivering quality, precision, and performance across every industry.

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Our Custom Planned

Maintenance

Sheet Metal Contractors Inc.

Family-owned and union-based, SMCI embodies a Legacy Built and Future Focused approach — delivering trusted HVAC and sheet metal craftsmanship throughout De Soto, St. Louis, and Jefferson County.

Learn More

Residential

services

At SMCI, we bring the same level of craftsmanship and expertise trusted by our commercial clients to every home we serve. From precision HVAC installations and custom sheet metal roofing to tailored maintenance plans, our team delivers comfort, quality, and reliability built to last. With in-house fabrication, 24-hour emergency support, and decades of experience, SMCI provides residential solutions that truly live up to our legacy — and your home’s future.

HVAC Installation & Replacement

Upgrade your home’s comfort with expertly installed heating and cooling systems built for performance and peace of mind.

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Sheet Metal Roofing

Protect what matters most with custom-crafted metal roofing that’s as durable as it is beautiful.

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24 Hour Emergency Service

Around-the-clock support from trusted SMCI technicians — because home comfort can’t wait until morning.

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Design-Build Solutions

Streamlined design-build services that bring engineering, fabrication, and installation together for efficient, tailored home comfort systems.

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Heating & Cooling

Around-the-clock support from trusted SMCI technicians — because home comfort can’t wait until morning.

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Custom Ductwork Fabrication

In-house Vicon coil line fabrication for precise, efficient air distribution and superior system performance.

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Manufacturers,

Specialties

Our Expertise | Our Partners | Our Industry

We work with leading HVAC and sheet metal manufacturers to ensure high-quality materials and equipment, and we’re proud to be affiliated with trusted industry organizations that uphold the highest standards of workmanship and safety.

Legacy

Built,

Sheet Metal Contractors Inc.

Future

Focused

Commercial

Services

Mechanical Design Build

Architectural Sheet Metal

Sheet Metal Roofing

Plan and Spec

24 Hour Emergency Service

Commercial Custom Ductwork Fabrication

Behind

The Brand

Built on Family Values

Industry

Expertise

Educational Facilities

Municipal & Financial Institutions

Restaurants & Hospitality

General Portfolio

Ask About

Our Custom Planned

Maintenance

Sheet Metal Contractors Inc.

Residential

services

HVAC Installation & Replacement

Sheet Metal Roofing

24 Hour Emergency Service

Design-Build Solutions

Heating & Cooling

Custom Ductwork Fabrication

our service

areas

Manufacturers,

Specialties

& Affiliations