An engineer joining a tendering department is usually handed the same first job: remeasure the quantities and price them. Many do it exactly as they were taught at university. Apply the state norms, apply published rates, add the prescribed percentages, produce a number. That number usually loses the bid. Or worse, wins it and loses money.
The reason is that a cost estimate versus tender price are two different pieces of work, even though both start from the same drawings. This article separates the two by purpose, sets out an eight-point comparison, explains who prepares each and when, then lists the seven things you must change when turning an estimate into a bid.
Two documents, two purposes
A cost estimate is the expected cost of building the works. The designer, or a consultant hired for the job, prepares it for the client using the norms, rates and method issued by the state. Its purpose is cost control: a basis for approval, for setting the package price, for comparing bids and for managing payment.
The estimate answers one question. If this project is built to the design at reasonable market rates, what does it cost? The article Where to start learning construction cost estimating describes that work in detail.
A tender price is what a contractor offers to carry out the package, stated in its bid. Its purpose is to win the work and make a profit: low enough to compete, high enough to cover real costs, tight enough not to unravel on site.
The tender price answers a different question altogether. Given my capability, my input prices and how I organise the work, what price can I do this for? Two questions lead to two ways of pricing.
In short: the estimate is what the project is worth, the tender price is what one particular contractor charges. On the Institute's construction cost estimating course, students price a building that has already been built and then compare their figure with what the contractor actually bid, so the gap between the two becomes a real number rather than a theory.
The eight-point comparison
| Point | Cost estimate | Tender price |
|---|---|---|
| 1. Who prepares it | The design or cost consultant, for the client | The contractor, for itself |
| 2. Purpose | Cost control: approval, package price, comparison, payment | Winning the work at a profit |
| 3. Quantities | Measured from the design, following the measurement rules | Remeasured, allowing for the construction method |
| 4. Norms | State-issued norms, or approved project norms | In-house norms: the real output of the crews and plant available |
| 5. Material, labour and plant rates | Published and market rates per the guidance, at the date of preparation | Actual supplier quotations, wages actually paid, own or hired plant |
| 6. Overheads and profit | Prescribed percentages | The company's real overhead and the profit it expects, which may be above or below those percentages |
| 7. Risk | Contingency at the prescribed rate | Assessed by the bidder: contract terms, price movement, programme, slow payment, weather, ground conditions |
| 8. Result | One approved figure, the same for every bidder | A different figure for every bidder, varying with strategy |
The cost estimate versus tender price split shows up hardest in rows 4 and 5. An estimate uses common norms and rates; a tender price uses the norms and rates of that contractor.
The consequence is practical. A contractor with productive crews, cheaper material supply and its own plant can bid below the estimate and still profit. A contractor hiring plant, buying materials in small lots and working far from base may not manage even at the estimate figure.
Who prepares each, and when
On a publicly funded project the two appear at different moments and sit in different documents.
- Design stage. The consultant prepares the construction cost estimate using the method in Circular 36/2026/TT-BXD, in force from 1 July 2026 in place of Circular 11/2021. The estimate is appraised and then approved; who appraises it depends on the funding source and the grade of the works. The approved estimate is the basis for the package price in the contractor selection plan.
- Tender stage. Each contractor prices the work and submits it in its bid. The client evaluates bids under the Law on Procurement No. 22/2023/QH15 and its amendments. Each bid price is corrected for errors and deviations, any discount is deducted, and only then is it compared with the package price. The law sets one hard condition: a bidder can be recommended for award only if its proposed award price does not exceed the approved package price.
- Contract and construction stage. The winning price becomes the contract price, administered under Decree 210/2026/ND-CP on construction contracts. The estimate still has a role here, as a reference for variations and during audit of the final account.
On privately funded projects the client is not obliged to follow the state method. Most still prepare an estimate or a budget, simply to have something to compare bids against. The substance does not change.
The career consequence is just as clear. Someone estimating at a consultancy needs command of norms, rates and the published method. Someone pricing bids at a contractor needs real costs, construction methods and contract terms on top of that. The second role is usually called quantity surveyor or tendering engineer, described in What is a quantity surveyor?.
Seven things to change when pricing a bid
The gap between an estimate and a bid is not a percentage. New engineers often take the estimate, shave a few per cent off it and call that a tender price, which skips all seven adjustments below.
1. Remeasure. Do not trust the tender quantities. The quantities in the tender documents may be short or over. Under a lump sum contract, a shortfall is the contractor's loss. Under a remeasurement contract, wrong quantities change your rate strategy. What is quantity take-off? lists the measurement mistakes that recur.
2. Replace standard norms with real output. State norms are an average. Your crews may be faster or slower than that average. Established contractors keep an in-house output table by work type, updated from projects already completed.
3. Replace published rates with real quotations. Get quotations for the main materials, including delivery to site. Use the wages actually paid in that region. Price plant according to whether you own or hire it. This is where the widest spread between bidders comes from.
4. Price temporary works to your own method. Formwork, scaffolding, tower cranes, temporary power and water, concrete pumping. An estimate usually folds these into overheads or a general allowance. A contractor must price its actual method, because this is where losses hide.
5. Use company overhead and profit, not the prescribed rate. Real overhead means offices, indirect salaries, bond fees and interest. Expected profit replaces the prescribed percentage. A company short of work may accept a thin margin to keep its crews together; a busy one will not.
6. Price the contract risk. Read the conditions of contract in the tender documents: lump sum or remeasurement, price adjustment or none, size of advance, payment period, delay damages. Every unfavourable clause is money that belongs in the price.
7. Decide the pricing strategy. Once you know your true cost, the figure you submit is a commercial decision rather than an arithmetic result. Bid low to win, bid high to stay safe, or load rates deliberately across items on a remeasurement contract. A new engineer should understand this stage before being asked to decide it.
Put another way, the estimate is a starting point and a benchmark, not a bid with a few per cent taken off.
Three ways contractors win and still lose money
The three situations below repeat so often that experienced tendering staff spot them while reading the tender documents.
A lump sum contract priced on the tender quantities. A lump sum moves the quantity risk onto the contractor. If your remeasure shows the tender quantities are short, that shortfall belongs in the price now, not in a variation claim later.
Material prices fixed at bid date under a contract with no price adjustment. On a package running many months, a rise in steel or cement is carried by the contractor. That exposure has to be priced from the start, or locked in with suppliers before the bid goes in.
Forgetting what the payment terms cost. A small advance, slow interim payments and retention all mean money the contractor funds while it waits. The cost of that money belongs in the tender price, and What goes into a construction payment and final account file? describes the paperwork that decides how fast it comes back.
None of the three is an arithmetic error. Each comes from treating cost estimate versus tender price as the same exercise. All three come from reading the contract conditions too quickly and using common figures instead of your own.
Frequently asked questions
Can a tender price be higher than the estimate?
On publicly funded work, no: the proposed award price may not exceed the package price, and the package price itself comes from the approved estimate. If every bid exceeds it, the client handles the situation under procurement law, usually by inviting all bidders to re-quote, or by re-quoting alongside a review of the package price. On privately funded projects it is for the client to decide.
How far below the estimate is a normal bid?
There is no standard figure across packages. The spread comes from each bidder's capability and strategy. A reduction far below the package price may prompt the client to ask the bidder to demonstrate that the price is workable.
Is the package estimate the same as the package price?
No. The package price is the figure approved in the contractor selection plan and used as the benchmark when bids are evaluated. The package estimate is the basis for setting or updating that price. The two are close but belong to different steps.
Can an estimator move into tender pricing?
Yes, and it is the usual path. Measurement, norms and rates carry across. What has to be learned is the company's real costs, construction methods and contract conditions.
Should you learn estimating or tendering first?
Estimating first. Without being able to read the structure of an estimate you cannot build a tender price, because a bid rests on the same work breakdown and quantities. Contracts and procurement come after that.