Before You Celebrate the Margin, Ask What's Missing
Job margins become useful when everyone agrees which costs are included. A practical way to reconcile the estimate with the profit the business keeps.
Ask three departments what a house will make and you may get three reasonable answers to three different questions.
Purchasing subtracts the lot and construction budget from the sales price. Sales subtracts the buyer's incentive as well. Accounting includes additional costs that haven't reached either report. The owner hears “22% margin” and assumes everyone means the same thing.
Before debating whether the margin is good, define it.
An illustrative $500,000 home with $390,000 of lot and construction costs has $110,000 left, or 22% of revenue. If another $25,000 of financing, commissions and concessions hasn't been included, the remaining amount falls to $85,000, or 17%. Company overhead still has to be covered. Classification policies vary, so those figures need clear labels rather than three versions of “profit.”
NAHB's 2024 construction cost survey separates construction, finished lots, financing, overhead, marketing, commissions and profit. Its sample reported an 11% average builder profit share of sales price. The survey isn't a target for an individual builder, and NAHB cautions that it isn't representative of every home or market. Its useful lesson here is the breadth of the cost stack. Construction cost alone doesn't explain what the business keeps.
Show the movement from estimate to expected result
Keep the original underwriting visible. Then show approved changes, purchasing differences, buyer concessions, financing changes and other revisions as separate movements. Replacing the original number with today's number erases the explanation management needs.
The review should also distinguish recorded cost from expected final cost. An invoice that hasn't arrived can still represent work already performed. A trade package that hasn't been awarded can still be necessary to finish the house. Neither disappears because the report is based on posted transactions.
Assign each cost once. When an invoice replaces an open commitment, reduce the remaining commitment accordingly. When an approved upgrade replaces a standard item, capture the credit as well as the new purchase. Otherwise the forecast can swing from understated to double-counted.
Give managers a number they can influence
Sales needs to understand the contribution after the concessions it offers. Purchasing needs the revised cost of the complete scope. Construction needs visibility into rework, delays and unfinished obligations. Owners need the bridge from those job results to company earnings.
This doesn't require sharing every confidential detail with every employee. It requires enough financial context for people to understand the consequence of their decisions.
At the next margin meeting, pick one house and reconcile the reports in front of everyone. Agree on the definitions, identify the missing costs and name the person responsible for each update. That hour will do more for margin discipline than another dashboard built on inconsistent numbers.
Source: NAHB, Cost of Constructing a Home, 2024, January 20, 2025.