One Simple Trick for Fixing Construction
Construction cannot price work accurately when nobody knows what it costs. Cost-plus contracts use transparency to align owners and builders today—and improve the market over time.
“A good estimate is the accurate summation of many small errors.”
An experienced estimator said this to me recently. It may be the most honest description of construction estimating I've heard.
It is also an admission that the industry doesn't really know what things cost.
If underestimating one scope is expected to cancel out overestimating another, the final price isn't accurate because the estimate is good. It's accurate because enough bets happened to offset each other.
That's not a sober financial projection. It's a portfolio of small gambles.
Construction doesn't need one more estimating trick. It needs to know what construction costs.
Construction has a price-visibility problem
Every fixed-price proposal conceals the same question: how much of the number is the expected cost of the work, and how much protects the builder from being wrong?
The builder has to account for incomplete documents, future price changes, schedule risk, market conditions, and every assumption that may prove false. Those risks become contingency, margin, exclusions, or qualifications. The owner sees a price, but neither side learns much about the cost beneath it.
For builders and owners, the clearest way to solve that problem today is a well-run cost-plus contract.
Cost plus replaces a hidden risk premium with visible project costs and an explicit contractor fee. The owner can see what labor, material, equipment, and subcontracted work actually cost. The contractor doesn't have to guess at every future price, bury a contingency inside the bid, and hope the combined errors still leave a profit.
None of this makes cost plus a blank check. A serious cost-plus agreement defines:
- which owner-provided items are excluded from the contractor's fee;
- the expected contingency;
- the approval process for subcontracts and material purchases;
- predefined labor rates; and
- what constitutes a change order—and how that change in scope is communicated and approved.
Those terms give the owner control in exchange for accountability from the builder. Budgets, commitments, invoices, approvals, and forecasts create a shared record of the project as it evolves. The owner can make informed choices about scope, schedule, quality, and cost; the builder can make those tradeoffs clear before they become surprises.
That exchange puts both parties on the same team. Transparency doesn't automatically make a project cheaper, but it does make the price more honest—and steadily more predictable—as the work progresses. The point isn't “spend whatever it takes.” It's to control cost collaboratively using current information instead of defending a guess made before the work began.
Fixed price turns uncertainty into a wager
Fixed price can work when the scope is complete, the schedule is known, and the builder can price the risk responsibly. But construction rarely holds still long enough for every early assumption to remain true.
When actual cost is lower than the contract price, the builder generally keeps the difference. When it is higher, the builder loses money unless the added cost can be classified as a change. That makes the boundary of the original scope a commercial fault line: the owner has reason to argue that work was included, while the builder has reason to argue that it wasn't.
This is the gamble baked into the model. The owner bets that the fixed price buys certainty. The builder bets that contingency and buyout savings will cover what the estimate missed. Even when everyone acts in good faith, the contract makes actual cost proprietary and gives the parties opposing interests in each surprise.
Cost plus changes the incentive
Cost plus turns the wager into a partnership. Direct job costs become the part of the project where the owner, builder, and trades can hunt for value together. The contractor's fee becomes explicit compensation for running the work well—not a hoped-for remainder hidden between revenue and cost.
The model gives owners real authority—and asks for real participation in return. They have to review choices, approve purchases, and make timely decisions. In return, the builder has to maintain legible accounts, explain forecast changes, and show that project money is being used as agreed.
That is the alignment: control for the owner, accountability from the builder, and a common interest in improving the value of the project. It is especially useful when design is evolving, lead times are unstable, or the work contains too many unknowns for a reliable fixed price.
The difficult sell is cultural. Owners have been taught that a fixed number is control, even when that number rests on allowances, exclusions, and invisible contingency. Builders have been taught to protect their cost knowledge because it is the source of their margin. Cost plus asks both sides to trade that defensiveness for a transparent operating process.
What a Kerala fish market teaches construction
Robert Jensen's influential study, The Digital Provide, examined what happened as mobile phone service reached fishing communities in Kerala, India, between 1997 and 2001.
Before phones, fishermen at sea had limited information about prices at different coastal markets. They had to choose where to land without knowing which market had demand. One market could have excess fish going unsold while another had scarcity and higher prices.
Mobile phones made price information available before the fishermen committed to a destination. Jensen found a dramatic reduction in price dispersion, the elimination of waste, and gains for both producers and consumers.
The striking result is that this wasn't a zero-sum transfer from buyers to sellers or from one group of fishermen to another. Information recovered value that the market had been wasting.
Modern construction already has phones, messaging, social media, estimating software, and project management platforms. Yet construction pricing can still resemble the old fishing market. The industry has faster ways to communicate, but powerful incentives keep cost information locked inside individual bids and businesses.
What is Buildplus?
Buildplus is the payments, expenses and invoicing platform built for contractors running cost-plus jobs. Every payment, swipe and reimbursable expense stays tied to the project it belongs to.
Better incentives drive the search for better value
The Kerala study operated across regional markets, and construction services are regional too. Builders generally buy labor and subcontracted work within the area where they build. That makes local cost knowledge particularly valuable.
A builder who has always bought a scope for one price may treat that price as a fact. It may only be a local minimum: the best value the business has found so far, from the familiar bidders it has asked. Without a reason to compare the result, neither the estimate nor the market improves.
Cost plus supplies that reason. Because direct job cost is visible and savings benefit the project, owners and builders can compare bids, question assumptions, and chase savings without negotiating against each other. The knowledge from one buyout improves the next control estimate. Better estimates make future comparisons more meaningful. Those gains compound.
Better incentives start the search for value; better information accelerates it—first within one business, eventually across an industry.
Transparency can make the whole market more profitable
Project transparency creates an immediate benefit between one owner and one builder. A culture of transparency extends the benefit across a regional market.
When builders know the going rate for comparable work, they can test whether a bid reflects scope, quality, market capacity, or simply a lack of competition. When owners understand the same costs, they can compare builders without forcing each one to conceal a different risk premium inside a lump sum.
Smaller contractors often have the least room for estimating error. They can't spread one bad job across a large portfolio, and they may lack the historical data or buying power of larger competitors.
More predictable pricing gives those firms a better chance to submit competitive bids with sustainable margins. It also helps established contractors grow without multiplying their exposure to uncertain work.
Owners benefit from clearer choices. Contractors benefit from more dependable profits. Efficient subcontractors benefit when buyers can compare real value. As in Kerala, transparency doesn't require one side to lose for the other to win. It reduces the waste created when buyers and sellers make decisions without enough information.
At an industry-wide level, that culture can make competitive bidding easier and gradually drive costs down. But that is the coda, not the immediate promise. The first benefit is a more collaborative project whose price sharpens as the work unfolds.
The takeaway
Transparency is easy to say and hard to practice. It requires clear agreements, disciplined project accounting, timely decisions, and owners and builders willing to be accountable to each other.
Cost plus is not an experiment. It is an industry-tested model—and, for work with evolving scope or meaningful uncertainty, many consider it best in class. It separates the builder's profit from project revenue and turns direct job cost into a place for collaboration instead of conflict.
That is how a builder earns profit deliberately, improves project value with the client, and builds a more sustainable business—not by hoping enough estimating errors cancel each other out.
And it is how the industry, one transparent project at a time, finally learns what construction costs.