A fixed-price contract locks in a total cost before you break ground, while a cost-plus contract bills you for actual materials and labor as they happen, plus a builder’s fee. Fixed-price offers security against rising material costs, but cost-plus provides transparency and flexibility if you decide to change your finishes mid-build.
Why do some homeowners prefer a fixed-price contract?
You want a firm number you can take to the bank and sleep soundly knowing your wallet is safe. It shifts the risk of fluctuating lumber prices or subcontractor spikes onto the builder rather than you.
When the price is set in stone, you know exactly what you’re signing up for before the first shovel hits the red clay in Alpharetta. You won't be sweating every time a shipment of copper wiring arrives. The trade-off is that if you want to upgrade your tile or add a pantry cabinet later, the change order process can be rigid and expensive. The builder builds a buffer into the initial price to protect themselves from uncertainty. You are paying for that peace of mind.
What is the actual reality of a cost-plus contract?
You pay exactly what the materials and labor cost, and you see the receipts. It is an open book. You and your builder act as partners looking for the best value for your specific home in Milton or Suwanee, rather than adversaries trying to protect margins.
This isn’t a blank check. We set a target budget, and we track it weekly. You aren't surprised by the total because you saw the costs rolling in as they occurred. If a vendor drops their price or we find a way to save on site prep, that money stays in your pocket. It requires a high level of trust and active participation from you. You’ll spend more time reviewing line items at the kitchen table.
Does the location of my project change which contract works best?
The soil conditions and permit requirements in Forsyth County can be unpredictable, but the contract type depends more on your personality than your zip code. Fixed-price works well when the design is finalized down to the last door handle.
If you are building a home on a steep grade or a tear-down lot where hidden conditions are likely, cost-plus often handles the surprises better. You don't want to get into a dispute over a "fixed" price when the site work digs up an old concrete foundation that wasn't on the original survey. A fixed-price builder will protect themselves by over-estimating these risks upfront. A cost-plus contract allows you to pay only for the work that actually needs to be done.
How do change orders affect the final price in either contract?
Change orders are the place where budgets go to die, regardless of the contract type. Changing your mind about the kitchen layout or the roofline after we’ve poured the slab is always an expensive move.
In a fixed-price build, every change requires a formal amendment that usually comes with a premium for the builder's time and administrative work. In a cost-plus build, the cost is simply the difference in materials and the labor to move the wall. You still pay for the rework, but you aren't paying a mark-up on a mark-up. Either way, the best way to keep costs down is to finish your design choices before you sign the contract.
Frequently asked questions
Is it easier to get a construction loan with a fixed-price contract? Most banks prefer fixed-price because they can easily assess the risk of the loan. Some lenders may require more documentation and a more hands-on review process if you choose a cost-plus structure.
Does a fixed-price contract mean I can't upgrade anything? You can upgrade, but you have to negotiate the cost of those changes as you go. Those changes are no longer "fixed" and will be treated as separate line items throughout the build.
Can I switch from one to the other midway through? It is rare and usually creates a mess of legal and accounting paperwork. You should commit to one structure before the construction documents are finalized and the permits are submitted.
Talking it through with a builder
You have to live in the home long after the construction dust settles. You should choose the payment structure that makes you feel in control, not the one that makes the process easier for the builder. If you want to sit down and walk through how these numbers might look for your specific lot, give the team at Kade Homes & Renovations a call. We can look at your plans and help you weigh the risks before you write a check.