Steel structure engineering quotation is the core link that determines a project's profit floor. 2026 industry data shows that the bid-rejection rate for steel structure projects rose 27.4% year on year, and over 60% of bid rejections stemmed from inaccurate quotation and price control. A large number of awarded projects ultimately incurred losses because hidden risks at the quotation stage were not identified in advance. Combining the latest pricing norms with industry practice, the core risks across the whole quotation process can be divided into six categories, supported by a directly implementable control system to avoid major losses caused by quotation errors from the source.

1. Price-Deviation Compliance Risk: Directly Triggers the Bid-Rejection Red Line

This is the most prevalent explicit risk in 2026 bidding scenarios. 87% of prefecture-and-above public-resource trading platforms nationwide have enabled a steel-structure-specific intelligent price-control verification module. A comprehensive unit price deviating from the market benchmark price by ±15% directly triggers a warning and may even be judged an invalid bid.

Core causes: when quoting, the latest local steel-structure price index was not strictly referenced to embed a dynamic price-adjustment formula, still using fixed floating coefficients for pricing; the steel-structure detailed-design fee was not listed separately as required by the new rules, with BIM modeling, weld inspection, etc. all lumped into vague provisional-measure items; the fireproofing and anti-corrosion process quotation had missing items, failing to distinguish the coating thickness and unit prices corresponding to different fire-resistance ratings of 1.5 h / 2.0 h / 3.0 h, causing reverse point deductions by evaluation experts against GB 50205-2026.

Prevention points: before bidding, download the Excel source table of the bid control price, separately filter the five core main materials - steel columns, steel beams, profiled steel sheet, shear studs, and fireproof coating - and compare them with the official local quarterly steel guidance price and mainstream material market average price; if a single-item deviation exceeds 8%, immediately initiate review and adjustment to ensure the overall quotation falls completely within the compliance range.

2. Main-Material Price Fluctuation Risk: Devours 70% of Project Profit

Steel structure project main-material cost accounts for over 70%. Market prices of core materials such as steel, welding materials, and anti-corrosion coatings can fluctuate noticeably within a single day, making it the most easily uncontrolled hidden risk at the quotation stage.

Core causes: pricing entirely at the current steel spot price when quoting, without forecasting the price trend over the next 6 months or pre-embedding price-fluctuation adjustment room in the quotation; some projects were quoted when steel prices were at a periodic low, but by the time the project entered centralized procurement, steel prices had surged more than 10%, directly causing material cost overruns of several million yuan and turning the project from slim profit to large loss in an instant.

Prevention points: at the quotation stage, coordinate with three or more mainstream steel suppliers simultaneously to lock an intended price range; reserve a 5%-8% material price-difference provision in the comprehensive unit price; and clearly mark in the quotation notes a price-adjustment mechanism stating 'when the steel market price fluctuates by more than ±5%, the price is adjusted according to actuals,' fully hedging raw-material price-fluctuation risk.

3. Omission and Miscalculation Risk: Hidden Costs with No Backstop

Steel structure joints are complex, with many special-shaped members and accessory small parts. Omissions and miscalculations at the quotation stage often do not appear immediately but are discovered during construction, with large cost gaps that fall outside the variation-compensation scope.

Core causes: manually omitting the weight of small members such as steel-column brackets, stiffeners, and connection plates; special-shaped polygonal steel plates not measured by the circumscribed-rectangle rule, directly undercounting hundreds of tons of work; at quotation, failing to list separately the special construction costs of large lifting-equipment mobilization/demobilization, temporary-support measures, and high-altitude work protection, lumping them into general provisional measures, resulting in severe cost shortfalls during actual construction.

Prevention points: implement a 'dual-person quantity-check review system' where two cost engineers independently complete quantity take-off and pricing, cross-checking all member details and measure items; for special-shaped steel structure projects, directly extract quantities from the BIM detailed model with one click, controlling quantity error within ±2% and completely eliminating omission and miscalculation hazards.

4. Rule-Misunderstanding Risk: Quotation Non-Compliant with National Standards

Quota rules and bill-of-quantities pricing details differ by region. Applying general rules when quoting easily produces deviations that do not meet local requirements, directly affecting quotation validity.

Core causes: confusing the boundary between bill pricing and quota pricing when quoting, double-counting the 1.5% steel construction loss into the bill quantities, whereas the national bill rule explicitly requires that loss already be included in the comprehensive unit price and not repeatedly added to the quantities; some provincial quotas require separately applying corresponding coefficients for steel-structure fabrication, transportation, and installation, but the quotation directly applied general rules, causing pricing non-compliant with local quota requirements.

Prevention points: before quoting, specifically sort out the latest local steel-structure pricing rules, and check each item against the 2025 edition of 'Standard for Measurement of Building Construction and Decoration Works' GB/T 50854-2024 to ensure all pricing logic fully complies with local official pricing rules.

5. Low-Price Vicious-Competition Risk: Falls Directly into a Loss Trap

Some enterprises in the industry deliberately suppress quotations to win bids, completely cutting reasonable risk costs. They seem to win the project, but are actually destined to lose from the moment of signing.

Core causes: to fight on price, directly giving up all 5%-8% risk cost in the comprehensive unit price, with no reserve for drawing deviations, working-condition changes, or minor rework; some even quote below steel procurement cost, hoping to profit later through large variation orders - once the client has no new variations, the project cost directly goes upside down.

Prevention points: establish a project-quotation red-line mechanism, clarifying the minimum gross-margin floor for different types of steel structure projects: gross margin for conventional portal rigid-frame projects shall not be below 12%, and for long-span complex steel structure projects shall not be below 18%; projects below the red line are directly abandoned, eliminating malicious low-price winning.

6. Special Working-Condition Underestimation Risk: On-Site Cost Far Exceeds Expectation

The quotation stage did not fully survey the site, and special working conditions were under-anticipated; only after mobilization is it found that construction conditions far exceed expectations and the quotation cannot cover the actual cost at all.

Core causes: before quoting, failing to verify the project's local wind and snow loads and geological conditions; failing to consider the secondary re-handling cost of members caused by a confined site; failing to anticipate the impact of the proportion of winds above force-6 on lifting efficiency; for projects in high-cold and high-corrosion regions, failing to additionally include special costs for low-temperature welding processes and special anti-corrosion coating, causing large cost overruns during actual construction.

Prevention points: before quoting, organize a joint full-dimensional site survey by technical and commercial personnel; separately calculate special-measure costs for special working conditions; and incorporate all unforeseeable working-condition increments into the quotation system, avoiding the discovery after mobilization that the quotation cannot cover actual expenditure at all.