510-399-4090

Design-Assist + Design-Build

Commercial Mechanical Design-Build & Design-Assist

Bring the mechanical contractor into the project earlier. 3rdGen helps develop system strategy, equipment selection, routing, coordination, constructability, and execution from preconstruction through field installation.

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CA Lic 1086898 • Commercial • Tenant improvements • Renovations • New construction • Licensed & insured

Project Inquiry

Start Project Information

Share project location, timeline, drawings if available, and where the mechanical scope stands today. We will review the project and follow up with the right next step.

How We Engage

Two Paths for Early Mechanical Involvement

Early Mechanical Involvement

Solve the Mechanical System Before It Becomes a Field Problem

Mechanical decisions made early affect equipment locations, ceiling space, shafts, structure, electrical requirements, architectural conditions, controls, budget, and construction sequencing.

By involving the mechanical contractor during design development, the project team can evaluate those realities before the system is fully locked and expensive conflicts reach the field.

Bring Us Into the Project
Commercial mechanical project with boom lift at a Bay Area jobsite

System Strategy

Equipment type, zoning, ventilation, distribution, controls, and mechanical approach developed around the actual project.

Constructability

Routing, access, equipment locations, service clearances, installation sequencing, and field conditions considered during design development.

Cost & Procurement Awareness

Mechanical decisions evaluated with equipment availability, major scope drivers, long-lead considerations, and construction reality in mind.

From Concept to Construction

Mechanical Design Development Through Field Execution

The goal is not design for design’s sake. The goal is a coordinated mechanical solution that can move from project requirements into construction with fewer unanswered questions.

  1. Project Inputs

    • Architectural drawings
    • Owner / project requirements
    • Occupancy and use
    • Existing conditions
    • Performance goals
    • Project schedule

  2. System Development

    • HVAC system approach
    • Equipment strategy
    • Zoning
    • Ventilation
    • Distribution concept
    • Controls approach

  3. Design Coordination

    • Equipment locations
    • Duct / piping routing
    • Ceiling and shaft coordination
    • Structural conditions
    • Electrical coordination
    • Service / access requirements

  4. Preconstruction

    • Scope development
    • Budget feedback
    • Procurement strategy
    • Submittal planning
    • Long-lead review
    • Construction sequencing

  5. Field Execution

    • Installation
    • Field coordination
    • RFIs where required
    • Controls coordination
    • Startup
    • Closeout

Mechanical Strategy

Mechanical Systems Developed Around the Project

The right mechanical solution depends on the building, occupancy, architecture, project constraints, owner priorities, and construction strategy. We do not force every project into the same system type.

  • VRF / multi-zone systems
  • Ducted HVAC systems
  • Heat-pump systems
  • Ventilation
  • Exhaust
  • Outside air
  • Sheet metal / ductwork
  • Controls coordination
  • Equipment replacement / modernization where relevant

Constructability

Designed With the Field in Mind

A mechanical concept is only useful if it can be coordinated, installed, serviced, commissioned, and delivered within the actual project conditions.

  1. Routing

    Mechanical paths considered alongside framing, structure, ceilings, shafts, and other trades.

  2. Equipment Access

    Locations evaluated for installation, maintenance, service clearances, and replacement access.

  3. Trade Coordination

    Mechanical requirements coordinated with electrical, plumbing, architectural, structural, and controls conditions.

  4. Sequencing

    Design decisions considered against procurement, rough-in, equipment setting, startup, and project schedule.

Project Team

Built to Work With the Project Team

Design-Assist and Design-Build only work when the mechanical contractor can communicate clearly with the people shaping and managing the project.

  • General contractors & estimators
  • Architects & design teams
  • Mechanical engineers
  • Owners & developers

Audience pages explain how we support GCs, architects, and engineers from scope review through field execution.

  1. 01 For General Contractors

    Mechanical input that supports estimating, coordination, procurement, schedule planning, constructability, and field execution.

    Useful when the mechanical scope is still developing and the GC needs practical feedback before buyout.

    Mechanical Support for GCs

  2. 02 For Architects

    Mechanical collaboration around equipment locations, ceiling conditions, architectural constraints, routing, and project intent.

    Early feedback before routing, access, and visible components are locked by field conditions.

    Coordination for Architects

  3. 03 For Engineers

    Contractor-side feedback on equipment, installation conditions, coordination, procurement, constructability, and field execution.

    Design-Assist input that stays grounded in how the system will actually be built and serviced.

    Working With Engineers

  4. 04 For Owners / Developers

    A mechanical partner capable of helping move the system from early project requirements through installation and turnover.

    One team that can help shape the mechanical approach and carry it into construction.

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Selected Work

Commercial Projects & Mechanical Execution

Selected 3rdGen commercial and project-based mechanical work across the Bay Area.

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Common Questions

Design-Assist & Design-Build Questions

Early involvement, design roles, coordination with the design team, and when Plan-Spec is the better fit.

When should 3rdGen get involved in a Design-Assist project?

Earlier is usually better when major mechanical decisions are still open. That gives the team time to review system approach, equipment, routing, coordination, constructability, and procurement before the documents are locked.

What is the difference between Design-Assist and Design-Build?

In Design-Assist, 3rdGen contributes contractor-side mechanical input while the project design team may retain primary design responsibility. In Design-Build, 3rdGen takes a larger role in developing the mechanical solution and carrying it through construction.

Can you work with our architect or mechanical engineer?

Yes. Early collaboration with architects, engineers, general contractors, and other trades is a core part of Design-Assist delivery.

Can you help evaluate different HVAC system approaches?

Yes. Depending on the project, we can help evaluate equipment strategy, zoning, distribution, ventilation, routing, constructability, and other mechanical considerations before the final system is selected.

Can you provide budget feedback before the mechanical design is complete?

Yes. Early contractor involvement can provide useful construction and procurement context while the mechanical scope is still developing. Final pricing depends on the level of design definition and project information available.

Do you also bid projects that already have completed mechanical plans?

Yes. Projects with substantially complete engineered mechanical documents are handled through our Plan-Spec delivery path.

Still developing scope?

Have a project where the mechanical scope is still developing?

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Other Delivery Paths

Other Ways We Deliver Commercial Mechanical Work

Project Inquiry

Bring Us Into the Project

Have a commercial project where the mechanical scope is still developing? Send the project information, current drawings, and where the design stands. We will review the project and determine the right next step.

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