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  • Writer's pictureKeith Groninger

Contracts and Risk

Updated: Dec 25, 2023

What's the difference between a "Fixed Price" or a "Cost Plus" construction contract for a new custom home in Winter Park, Orlando and Central Florida?


Also known as a Lump Sum agreement, with a Fixed Price contract, the Builder agrees to perform the work for an established total price. The price is based on the construction plans and specifications provided to the Builder.


When a Cost Plus agreement is used, the total price may not be known until all of the work is completed. The Owner pays for all of the construction costs, plus a fee to the Builder, often resulting in “sticker shock” when the final price is tallied.


On the surface, a Fixed Price agreement may seem like it offers less risk to the Owner, because the total price is known up front. Often associated with competitive bidding, the Fixed Price contract is usually awarded to the low bidder; or the Builder that has figured out how to build your home the cheapest way. This relationship creates risks and challenges that may result in other surprises.


In order to establish a fixed price on a project, the Builder needs an extraordinary set of documents to follow. The construction drawings and specifications must adequately describe every aspect of the project down to the finest detail, otherwise the fixed price may be based on assumptions or exclude omitted items. Imagine the effort necessary to make every decision and provide accurate information about every detail before choosing a Builder.


Oftentimes, when designs and drawings are completed, they are done so without a detailed construction budget. All too often when the project is finally ready for bidding, the resulting bids exceed the budget expectations of the owner, resulting in expensive re-design fees or even abandonment of the project.


Note: Do not select a builder based on a ballpark or preliminary estimate. It's very likely that the total cost will change substantially before construction is ready to begin.

Fixed Price agreements also operate under a cloud of uncertainty. The Owner has no knowledge of the construction costs or the fees the Builder is charging for their work. If changes are requested, the Owner may be forced to pay whatever the Builder demands otherwise the change won’t be incorporated. To avoid this, it emphasizes the importance of the construction drawings and specifications. Again, imagine the effort necessary to make every decision and provide accurate information about every detail before choosing a Builder.


This magnitude of information and decisions associated with a one-of-a-kind custom home, is often the reason why some Owners opt for a Cost Plus relationship with their Builder.

While the type of contract is usually associated with the construction side of the relationship, some designers prefer Cost Plus agreements because it offers them freedom to make design changes even after construction has begun. From the Builder’s perspective, Cost Plus frees them from the risk of losing a project to the competitive bid process and eases the burden of creating a detailed upfront estimate for the project. Many Owners go into a Cost Plus relationship believing that it will save money because they can be involved in the “open book” nature of the project. In our opinion, each of these perspectives creates an environment where incomplete decisions and the production of loose information is deemed acceptable.


Nobody wants surprises related to the budget or time schedule of a project. A responsible Builder should provide accurate upfront pricing and an organized process that supports an efficiently managed project. Other approaches, regardless of implied benefits, are simply lazy attempts at moving the project forward.


A Better Way


At Groninger Custom Homes, our design-build process, hybrid construction agreement and open book project management, provide a flexible approach that reduces risks to all parties and creates a relationship that fosters trust and mutual benefit.


While our contract is fee-based, it features a guaranteed maximum price and also offers incentive to save money and share the savings between Builder and Owner. During the design phase of the project, we will provide constant detailed budget updates as the home design and drawings take shape. We share our fee and costs openly so that you have the information to help direct the budget for the home. Once the scope of the project has been established, we set our fee at a fixed number, essentially removing any motivation to increase costs since our fee is not based on the construction cost of the project.


Our entire design-build process is full of transparency and designed to remove uncertainty and establish a team approach to the management of your project. We share everything openly, so please don’t hesitate to ask if you have any questions.


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Little is more meaningful and personal than a home, and the experience of designing and building your own home should be rewarding and enjoyable. Choosing a builder is difficult. The process of designing and building a home involves numerous decisions about components, systems and services selected from criteria that includes price, quality, appearance and performance. How can you possibly understand everything unless the builder is willing to share all of the information?


Allow us to introduce you to The GCH Way of building your next home. Please let us know if you have any questions. Keith Groninger

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