Lennen Commercial Builders, Inc. makes the often complex building process an exciting experience for you. With Lennen Commercial Builders, Inc. you can feel confident that we make the process of building as efficient and cost effective as possible. Our values of Integrity, Quality, Value and Performance and Experience result in professionally designed, engineered and constructed facilities with guaranteed customer satisfaction.


Our Services

Lennen Commercial Builders, Inc. offers these services on a national level:

  • Project Consultation
  • Project Planning
  • Site Evaluation
  • Space Planning
  • Interior Design
  • Architecture
  • Engineering
  • Value Engineering
  • Project Management
  • Construction

Single Responsibility or Traditional Contracting?

Also known as “turnkey” or “design-build”, Single Responsibility is a method whereby one entity is contracted to preform both the architecture/engineering design portion of the project as well as the actual construction. The Single Responsibility approach involves start-to-finish partnership versus mere piecemeal advisement. You become a vital part of a “design-build” process as we work with you to meet your needs and overcome any challenges that arise.

The “Traditional” contracting approach differs from the Single Responsibility in that you commission an architect and/or engineer to prepare your drawings and specifications. Once the drawings and specifications are complete, you then hire a General Contractor either by bidding, preference or negotiation. This approach requires two separate entities, two separate contracts and two separate costs.

Both approaches work! Both approaches have been utilized throughout our economy. It is up to the client to decide which process best meets their needs.

Advantages of Single Responsibility

  • Undivided Responsibility

    One contract covers all aspects of your project – architecture, engineering and construction. This allows you to focus on just one firm that is responsible for maintaining cost, quality, schedule and performance. The result is clear responsibility, immediate responses and maximum cost control.

    Another advantage is the ability to exercise your desired level of control over the design of your project while remaining completely aware of the cost relief and/or implications from each decision. Also, your control of the entire process is strengthened by contracting with a single entity that is committed to the success of your project, unconditionally.

  • Early Knowledge of Costs

    Because you are working with a design-build team, the concept of your project can be completed at an early stage. Continuous estimating, concurrent with the design development, results in overall cost knowledge much sooner than traditionally possible. Also, you have the ability to make decisions early, which is one of the key factors in cost management.
  • Time & Money Savings

    Working with a Design-Build team eliminates redesign delays and bidding periods that can cost you valuable time and money. With the Single Responsibility approach, not only is the design-build period significantly reduced, but it also anticipates methods and materials more efficiently and accurately. Cost-affecting decisions are continuously reviewed in the design process allowing you to maintain your budget and schedule, resulting in earlier utilization of your completed project.

Project Responsibility Flow Chart

Project Responsibility Flow Chart

How is a Single Responsibility Contractor Selected?

Single Responsibility Contracting replaces the process of having to select a design professional as well as a construction contractor. Numerous proposals can be obtained from a variety of different selection approaches.

  • Direct Selection

    You select a Single Responsibility contractor directly, using such factors as reputation, past performance, qualifications, prior association and/or referrals.
  • Competitive Negotiation

    You interview multiple Single Responsibility contractors and make your selection based on recent comparable costs, fees, scheduling obligations and personnel assigned to your project.
  • Cost Competition

    You provide criteria for your project and request the bidders to prepare both preliminary designs and cost quotations. Each proposal will be different in design and cost. This approach allows you to evaluate each proposal and determine the best design and value for you and your money.

What Type of Contracts Are Used?

Single Responsibility offers you quite a bit of flexibility. A variety of contract formats have been developed to tailor a design-construct contract that meets the needs of both you and your contractor. Generally, both you and your selected contractor enter into a “multi-phase” agreement with an initial design cost at a nominal fee. When initial costs are determined and both you and your contractor are in agreement, detail and construction phases are then added using one of the contract formats below:

  • Fixed Fee-Guaranteed Maximum

    You and your contractor agree upon a fee for your contractor’s profit and overhead and your contractor produces the absolute maximum cost for your project. This type of contract provides for sharing of any savings between you and your contractor and protects you from costs in excess of the maximum cost you originally agreed upon.
  • Lump Sum

    Your contractor provides a stipulated Lump Sum amount for both the design and the construction of your entire project. You pay only the contracted Lump Sum whether there are any increases or decreases in the actual cost of your project.
  • Cost-Plus-Fee

    The Cost-Plus-Fee contract is used when accurate cost estimates are difficult to determine. With this type of contract, you and your selected contractor agree upon a “lump sum” for the design portion of your project as well as a profit and overhead fee for your contractor.