A work estimate involving steel is not read the same way as a painting or plumbing estimate. The presence of load-bearing or structural metal elements introduces regulatory requirements, cost variations related to raw material prices, and technical aspects that many individuals discover when comparing the received offers.
EN 1090 Standard and Execution Class: What the Estimate Must Mention
When steel contributes to the stability of a structure (framework, walkway, column, composite floor), the EN 1090 standard governs its manufacturing and assembly. This standard conditions the CE marking of the structure. An estimate that omits the execution class, material traceability, or control methods cannot be seriously compared to a compliant offer.
The execution class (EXC1 to EXC4) defines the level of rigor expected for welds, assemblies, and inspections. For a single-family home, class EXC2 is sufficient in most cases. For a building receiving the public or a large-span structure, EXC3 or even EXC4 may apply.
In practice, if a contractor offers a significantly lower price without specifying these elements, the price difference likely reflects a lower level of compliance, rather than better productivity. Professionals who have support from chantieraccess.fr for steel structure their offers around these requirements, making it easier to compare item by item.
Increase in Steel Prices in 2026: Impact on the Validity of Estimates
The French Federation of Building reports that between February and June 2026, steel products increased by nearly 10%, while the overall materials cost of BT01 rose by 4.3%. This price pressure has a direct consequence on how an estimate should be read.
Two points to check before signing:
- The validity period of the estimate: an estimate valid for 30 days in a context of rapid increase protects better than an estimate without a deadline, which could be revised upwards at the time of project launch.
- The existence of a material price revision clause: some contractors index the cost of steel supply to an official index (BT01 or specific steel index). This clause, if included in the estimate, frames possible adjustments and avoids unpleasant surprises.
- The detail of the supply item: an estimate that clearly separates the cost of raw steel, surface treatment (powder coating, galvanization), and labor allows for measuring the real impact of price fluctuations.
A global estimate without breakdown makes any negotiation impossible. If the price of steel drops between signing and starting, a detailed supply item offers a concrete lever to request an adjustment.
RE2020 and Metal Construction: Verify the Compliance of the Estimate
For building permits submitted from May 1, 2026, the RE2020 extends to many tertiary, industrial, and artisanal buildings. Metal works (envelopes, frames, sunshades, canopies) can affect the energy and carbon indicators of the project.
This means that an estimate for steel elements integrated into a new building must specify whether the products have an Environmental and Health Declaration Sheet (FDES). Without an FDES, the thermal study office cannot properly integrate these elements into the regulatory calculation, which can block the permit submission or impose costly compensations on other items.
A contractor or metal construction company that anticipates this requirement mentions it in their offer. The absence of reference to RE2020 in a 2026 estimate for new construction is a warning sign, not necessarily of bad faith, but of a lack of regulatory update.
Reading Grid to Compare Steel Estimates Item by Item
The comparison is not only about the total including tax. Three estimates for a metal framework may show similar amounts while covering very different services. Here are the items to isolate in each offer:
- Steel supply: steel grade (S235, S355), origin, material certificate. S355 steel is more expensive but allows for thinner sections, reducing overall weight.
- Surface treatment: hot galvanization, powder coating, metallization. Each process has different costs and durability. An estimate that simply states “paint” without specifying the type of protection is insufficient.
- Workshop manufacturing labor: welding, drilling, assembly. This item varies according to the geometric complexity of the work.
- Transport and lifting on site: the weight of steel elements sometimes requires a crane or special convoy, the cost of which does not always appear in the initial estimate.
- Assembly and bolting on site: estimated duration, number of workers, lifting means included or not.
An estimate that combines manufacturing, transport, and assembly into a single line prevents any analysis. Requesting a breakdown by item remains the first reflex before comparing competing offers.
Qualifications and Insurance to Check
Beyond the price, professional qualification conditions the quality of execution. For metal structure work, a qualification issued by a recognized organization (Qualibat, for example, in the metal construction category) attests to verified know-how. The ten-year insurance must explicitly cover load-bearing metal works, as some policies exclude this type of service.
The cheapest estimate loses all interest if the company does not have appropriate coverage. In the event of damage to a non-covered structural element, the project owner bears the full cost of repairs.
Comparing estimates for steel work is about comparing technical commitments as much as prices. Compliance with EN 1090, consideration of RE2020, item breakdown, and insurance coverage form a minimal foundation. An estimate that ticks these boxes, even if slightly more expensive, reduces the risk of cost overruns and disputes on site.
