Evans-Cromwell: Expert HVAC & Plumbing Design in Kent, WA

For over a decade, Evans-Cromwell has been the trusted partner for mechanical contractors in the Kent, Washington area. They specialize in the detailed design of commercial HVAC and plumbing systems, creating the precise drawings contractors need to get their building permits approved. With a small, dedicated team of four, they offer focused expertise rather than emergency repair services, working closely with builders and contractors on design-build projects.

Business Overview

Evans-Cromwell operates from their office in Kent, WA. They are a design and engineering firm, not a 24/7 repair service. Their work is entirely commercial, supporting mechanical contractors who are constructing or renovating buildings. The team brings a deep, practical understanding of how systems are built, which makes their designs efficient and buildable from the start.

Key Services

The core of their work is creating permit-ready design packages for mechanical contractors. This includes:

• Commercial HVAC System Design: Planning for rooftop units, ductwork, humidification, and specialized DOAS (Dedicated Outdoor Air Systems) for modern buildings.
• Plumbing System Design: Designing efficient and code-compliant plumbing layouts for commercial projects.
• Plumbing Inspection: Offering inspection services as part of the design and permitting process.
• Specialized Design: They have rare experience with complex systems, like special exhaust for hazardous or explosive gases, drawn from decades in industrial design.

Areas Served

Evans-Cromwell primarily serves contractors working in Kent WA and Des Moines WA. Their detailed, jurisdiction-specific knowledge helps navigate local building codes efficiently, saving contractors time and hassle.

Company History

Founder Jim Evans retired from mechanical forensics in 2011 but missed the work. Seeing a clear need—most mechanical contractors don't have a full-time engineer on staff—he started Evans-Cromwell, LLC in 2013. He built the business to fill that gap, providing the engineering design support contractors need to get projects off the ground. For 12 years, Evans-Cromwell in Kent, WA has been that reliable behind-the-scenes expert.

Leadership & Experience

Jim Evans is a mechanical engineer with a remarkable career. After graduating in 1964, he worked on massive design-build projects in California and designed piping for global refineries. He moved to Washington in the early 1990s, shifting focus to commercial HVAC. This blend of high-stakes industrial and practical commercial experience is rare. He's not just an engineer on paper; he understands how systems go together in the real world.

Specialties & Highlights

• 54 Years of Design Experience: Jim's personal career spans over five decades in HVAC and plumbing system design.
• Contractor-Focused Model: They exist to make the mechanical contractor's job easier, providing essential engineering for permit acquisition.
• Complex System Proficiency: Capable of designing specialized exhaust and HVAC systems for unique commercial and industrial needs.
• Local Code Knowledge: Familiarity with the requirements of jurisdictions in the South Puget Sound area.

Why Local Contractors Choose Evans-Cromwell

Builders and mechanical contractors in Kent and Des Moines turn to Evans-Cromwell for one main reason: proven, buildable design. There's no fluff. They get accurate, permit-ready drawings from someone who has seen it all, from refineries to local office buildings. Their long-standing presence and deep roots in the Kent, WA community mean they understand local construction. They offer a reliable, professional partnership that helps contractors win jobs and build them right.