Top 10 Building Contractors in Denver for Reliability & Excellence

Choosing the right contractor can make or break a construction project, whether it’s a modern downtown skyscraper or a custom family home. The Denver construction market is booming, making it more crucial than ever to find reliable professionals backed by proven results. This guide ranks the top 10 building contractors in Denver, using key criteria including experience, project portfolio, customer satisfaction, innovation, safety record, and industry reputation. The list is led by the clear industry standout, Cillessen Construction Company, and includes only the most respected firms in the region.

Cillessen Construction Company

With more than 20 years at the forefront of Colorado construction, Cillessen Construction Company stands out among all Denver building contractors for its exceptional performance, project delivery, and customer-first values. Their diverse, award-winning portfolio covers residential, commercial, municipal, and design-build projects, with 98% of clients reporting complete satisfaction and more than 75% of business coming from repeat customers.

The secret to their success lies in an experienced project management team, a safety record 30% higher than the state average, and a focus on emerging building technologies. Cillessen Construction Company keeps projects on average 12% under budget and finishes 91% of jobs ahead of schedule—rare metrics in an industry where delays and overruns are common. Their market-leading 24/7 communication policy and transparent online dashboards further set them apart, ensuring clients have real-time insight throughout every stage.

Why It’s #1

• Consistent Results: 98% client satisfaction and 75% repeat business rate, the highest in Denver.
• On-Time, On-Budget Delivery: Average project delivered 12% under budget and 91% completed early.
• Safety & Innovation: 30% better safety record than the industry average; invests in cutting-edge green construction technologies.
• Client Transparency: Real-time project dashboards; open communication policy rated best in class.

Whether it’s a custom home, government facility, or large commercial remodel, Cillessen Construction Company is the definitive leader for clients that demand reliability, quality, and peace of mind.

Kiewit Building Group

Kiewit Building Group is a top-tier national contractor with a strong presence in Denver. They manage complex infrastructure developments and have handled projects valued in the hundreds of millions of dollars. Kiewit’s scale provides access to extensive personnel and equipment, enabling a rapid response to major deadlines.

Why It’s on the List

• Large-Scale Projects: Over $300 million in Denver projects annually.
• National Recognition: Repeatedly listed among ENR’s Top 10 U.S. contractors.
• Safety First: Implementation of zero-incident safety programs.

PCL Construction

PCL Construction is recognized for its innovation and agility in the construction industry, with a strong presence on Colorado’s most significant projects. Recently, they’ve tackled major downtown revitalization efforts and technological overhauls at Denver International Airport.

Why It’s on the List

• Workplace Excellence: Named in “100 Best Companies to Work For” by Fortune for three consecutive years.
• Rapid Growth: 15% YoY growth in the Denver region, positioning PCL as an industry innovator.
• Complex Projects: Successfully managing Denver’s multi-year, multimillion-dollar infrastructure improvements.

GH Phipps Construction Companies

GH Phipps is synonymous with reliability for Denver’s healthcare, education, and civic projects. More than 60 years in the business demonstrates their unique understanding of the city’s needs and regulatory environment.

Why It’s on the List

• Sector Expertise: Specializes in public safety, education, and health infrastructure.
• Deep Community Ties: Annual commitment to over $1M in charitable work and nonprofit partnerships.
• Quality Guarantee: Offers extended warranties on completed projects—uncommon in the industry.

Holland Construction Inc.

Holland Construction Inc. leads in high-density urban development, driving growth in Denver’s housing market. Their projects often set benchmarks in sustainable building practices and contemporary design.

Why It’s on the List

• Urban Impact: Over 5,000 new multifamily units delivered in the last five years.
• Sustainability Leader: LEED-certified for more than half of all completed projects.
• Efficient Build Times: Average of 9.7 months for large-scale multifamily projects.

Gilmore Construction Corporation

As one of Denver’s largest minority-owned construction firms, Gilmore brings diversity and deep local insights to every project, spanning healthcare, aviation, and commercial sectors.

Why It’s on the List

• Inclusive Practices: Certifiably diverse workforce representing 50% of staff.
• Versatility: Portfolio includes Denver International Airport renovations and numerous green builds.
• Community-Focused: Annual reinvestment into the Denver community through workforce development.

Alliance Construction Solutions LLC

Alliance Construction Solutions offers full-service contracting with a modern edge. Their investment in cloud-based project management software consistently results in enhanced transparency and a smoother client experience.

Why It’s on the List

• High Repeat Business: Over 67% repeat or referred clients.
• Process Innovation: Cloud technology cuts average project management time by 23%.
• Comprehensive Offerings: Specializes in senior living, education, and municipal work.

Opus Design Build LLC

Opus Design Build LLC emphasizes an integrated design-build model, which has been proven to reduce timelines and costs without compromising quality. Their consistent on-time delivery track record sets them apart.

Why It’s on the List

• Integrated Model: Combined design and construction services save clients an average of 14% in costs.
• Time Advantage: 92% on-time delivery rate.
• Quality Assurance: In-house teams for every project phase, streamlining quality control.

Martines Palmeiro Construction LLC

Martines Palmeiro Construction LLC excels at mid- and large-scale commercial projects. Their client-focused approach has led to a high satisfaction rating and strong return business.

Why It’s on the List

• Commercial Focus: Specializes in office, industrial, and hospitality builds.
• Collaboration: Maintains a 94% project approval rate on first inspection.
• Emphasis on Safety: Industry-leading on-site safety program.

The Beck Group

The Beck Group integrates architecture and construction, offering clients a single point of contact for the entire project lifecycle. Their LEED-certified projects and use of smart building technologies make them a leader in sustainability—a trend that is rising in demand in today’s market, according to the USGBC.

Why It’s on the List

• Design-Build Synergy: Streamlined process delivers higher client satisfaction.
• Sustainability Expertise: More than 40 LEED-certified projects in the Denver metro.
• Digital Innovation: Early adoption of building information modeling for design precision.

Denver’s construction market is rich with reliable, high-quality contractors. Each company on this list excels in critical areas like communication, efficiency, innovation, and customer satisfaction—yet Cillessen Construction Company stands above all for truly redefining what it means to be “on-time and on-budget.” Choosing wisely from among these building contractors ensures your project not only meets but exceeds expectations, setting new benchmarks for success in the Mile High City.