Part two of the Cost Plus Contract series delivers the structure that prevents $100K+ overruns. If you caught Episode 56 last week, you know Cost Plus is when your contractor gets reimbursed for every cost plus profit margin on top—and it only works for three kinds of homeowners: the very experienced, the truly indifferent to total cost, or someone working with a great craftsman who's horrible at bookkeeping. If you went through the seven questions at the end of Episode 56 and your answer was walk away, you're done. Catch Episode 58 next week when we cover fixed price contracts. But if you decided Cost Plus is still the path—by choice, because that's what your contractor offers, because you're rebuilding after a fire, or because you're doing a complex remodel where Cost Plus is honestly the right call—this episode is for you. In the book, I talk about Cost Plus contracts like rappelling down a cliff. You can do it. People do it all the time. But you better secure the rope at the top before you start. This episode is all about securing the rope. The 5 Things to Settle Before Work Starts Settle these with your contractor before the first bill arrives, before there's anything to argue about: 1. Billing Frequency — How often will you get billed? Once a week, twice a month. Most contractors bill on their payroll cycle. If they pay their crew every two weeks, they want to bill you every two weeks. Match yours to theirs. Predictable timing means you can plan reviews, set aside money, catch problems early. Unpredictable timing means you're always reacting, writing checks in a hurry, hoping to catch up later. 2. Employee Hourly Rates — Each worker should get billed at their actual loaded cost: wages plus payroll taxes, workers comp, unemployment insurance, health benefits, vacation. On a worker making $30/hour in wages, you might pay $45/hour loaded. That's not markup—that's the actual cost of having an employee. The markup comes later as profit and overhead. Watch for double-dipping: some contractors tack P&O onto each individual hour, then add it again at the bottom of the bill. Ask upfront what's included in the hourly rate. 3. Payroll Honesty — Every worker on your job should be on the contractor's actual payroll with full benefits and proper insurance. The loophole: some contractors hire day laborers, pay them cash, bill you the full loaded rate as if those workers were on payroll, and pocket the difference. It's illegal. It's insurance fraud. If a day laborer gets hurt on your property and the contractor wasn't carrying proper coverage, you can be on the hook. Ask for certificates of insurance for workers comp covering everyone on site. Verify them with the carrier directly. 4. How the Contractor's Own Time Gets Billed — Your contractor spends real time on your project that isn't on site: ordering materials, meeting with your designer, calling subs, writing emails. Settle how that gets billed. Common arrangement: contractor's on-site time gets billed hourly. Off-site administration time gets covered in profit and overhead at the bottom of the bill. Pick one and put it in writing. 5. Mistakes — They're going to happen. On a strict reading of Cost Plus, the homeowner pays for all time and materials regardless of whose fault. On a fair reading, when the mistake is clearly the contractor's, they should absorb it out of profit and overhead. Most Cost Plus mistakes happen because of poor plans, thin specs, and missing information. Have the conversation before you start, agree on how mistakes will get handled, put it in writing. When the inevitable happens, you have a framework instead of an argument. The Documentation Discipline On a Cost Plus contract, documentation is the protection. Every receipt, every bill, every supplier statement, every time card that gets billed to you should clearly identify your project. Pick a code—your last name, your street number, doesn't matter what, just be consistent. Don't pay for handwritten bills. Don't pay for receipts that don't identify your job. Every invoice from your contractor should identify which work breakdown structure category it belongs to. When an invoice is tagged to a WBS category, you can see at a glance whether spending is on track. Plumbing budget $20K, plumbing invoices to date $18K, project 60% done—are we on pace? You can answer that question. Without WBS tagging, you have a stack of paper. With WBS tagging, you have a project dashboard. Set a review window. Seven to ten working days is reasonable. During that window, spot check three line items, look at dates, check whether the time card matches the calendar and what you know has progressed. Call a supplier or two and confirm materials match what they say they're for. This isn't paranoia. This is professional billing review. Every commercial owner does it. You should too. The Hybrid Model: 4 Moves That Take Risk Off the Table These don't turn Cost Plus into fixed price. They inch it that direction. Enough to sleep at night. Enough to catch problems before they become disasters. Move One: Overall Budget by Work Breakdown Structure — Ask your contractor to prepare a high-level look at total project costs broken down by category. Site prep, demolition, foundation, framing, electrical, plumbing—every category with an estimated dollar value. This budget becomes your reference. Everything else builds from here. Move Two: Not-to-Exceed (NTE) Clause — Once you have the budget, attach a written ceiling on total project cost. The contract says final cost shall not exceed the budget plus a reasonable percentage except for owner-approved changes. This caps your exposure. You know your maximum. The contractor takes on risk above that cap, which gives them real reason to manage costs. The critical detail: the cap moves only when scope changes through a written change order signed by you. Move Three: Cost Accounting Against the Budget — Every dollar that gets spent gets tagged to the WBS in the budget. Compare actual to estimate every month. Month three: plumbing budget $20K, plumbing invoices to date $14K, plumbing rough-in complete, fixtures installed—you're in good shape. Compare that to foundation budget $40K, foundation invoices $52K, foundation work isn't done—you have a problem. Cost accounting surfaces that problem now, not at the end when there's nothing left to do about it. Move Four: Completion Incentive — Cost Plus structurally rewards delay. The longer the project takes, the more the contractor bills. The fix is a written incentive for finishing on time and on budget. If final cost comes in under the NTE cap, savings get split 50-50 or 70-30 in your favor. Frame it as "we both win when costs come in lower." Most contractors will go for that. Who Reviews Your Bills? Open-book transparency only works if someone is actually opening the book. Most homeowners don't have the time, expertise, or stomach to do trust-but-verify on every line item every month for two years. You probably already have the perfect person: your architect. Your architect already knows the project. They drew the plans. They wrote the specs. When an invoice comes in for tile installation that doesn't match the spec, your architect catches it because they wrote the spec. Adding bill review and on-site supervision to the architect's role is called construction administration (CA services). Typical cost: 1-3% of project cost. On a $500K project, that's $5K-$15K. Until you remember that Cost Plus exposure can run 20-40% over budget without proper management—that's $100K-$200K of risk. $5K-$15K to manage $200K of risk is a deal. If your architect can't or won't take on the role, there's a separate professional called an owner's representative or owner's agent. Same job: review invoices, attend meetings, audit billing, supervise construction on your behalf. Related Episodes: Episode 56 — Cost Plus Contracts: The Decide Episode Episode 52 — Work Breakdown Structure Episode 58 — Fixed Price Contracts (coming next) Cost Plus without structure is rappelling without a rope. This is your playbook. Get the book — The Awakened Homeowner: https://www.amazon.com/dp/B0F1MDRPK7 Also available on all platforms: https://books2read.com/u/bpxj76 Free Download — The Tale of Two Homeowners: https://the-awakened-homeowner.kit.com/09608e1727 BuildQuest Planning Platform: https://buildquest.co More resources: https://www.theawakenedhomeowner.com/ Questions? 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