What Each Line of a Steel Quotation Measures

Most buyers read a quotation as a shopping list. That reading produces one number and one question, which is whether the number is acceptable. It also discards almost all of the information in the document, because a quotation contains a description of the building that no other document contains: the supplier's own understanding of what they were asked for.

Reading it line by line as a set of measurements returns that information. It also makes the comparison between two suppliers a comparison of documents rather than a comparison of totals, which is the only form of comparison that produces a decision.

Why a quotation has lines at all

The lines exist because the building is assembled from parts that are bought, cut, welded, painted and packed by different people. Each line is a place where money leaves the supplier's account, and a well-built quotation follows the money. A quotation with very few lines is therefore not a simpler document; it is a document in which several of those places have been merged, and merged places are where a scope boundary disappears.

Fewer lines means less control, not less work

A single lump-sum line tells the buyer nothing about composition, so nothing can be removed, added or checked. A quotation with thirty lines lets a buyer delete the insulation and see what the insulation was costing, which is a decision the buyer may want to make. The number of lines is a proxy for how much of the building the supplier is willing to describe, and a supplier who will not describe it cannot be held to a description.

The line you cannot find is the line that costs

Before reading any figure, list the physical parts of the building and mark which of them appear as a line. The frame, the purlins, the bracing, the cladding, the insulation, the flashings, the doors, the bolts, the base plates, the gutters, the downpipes, the sealants. Anything on that list with no line against it is either inside another line, in which case it is unquantified, or absent, in which case it will be quoted later.

The lines that measure steel

These are the only lines with a physical quantity behind them that can be recalculated independently. They are also the lines where two quotations for the same building diverge most sharply, and where that divergence is usually legitimate rather than sinister.

Tonnage, and what the number is weighing

A tonnage line should state whether it is a calculated weight or an allowance, and it should separate the primary frame from the secondary members. Primary frame tonnage follows the span, the bay spacing and the wind load. Secondary tonnage follows the purlin spacing and the cladding span. Two suppliers quoting a materially different primary tonnage are not quoting the same frame, and no amount of reading the totals will reveal that.

Surface area, and why cladding is measured twice

Cladding is quoted by area, and the area quoted is rarely the floor area. It is the developed roof and wall area, plus an allowance for laps, openings and waste. Ask for the roof area and the wall area separately, and ask what waste allowance is included. A wall area that equals the perimeter multiplied by the eave height has ignored the gable ends, and that omission is one of the most common silent reductions in a competitive quotation.

Fasteners, and the count that is never checked

Fixings are usually inside the cladding line, which is why nobody counts them. Ask for the screw count as a number, and ask what spacing it assumes. Fixing spacing at the edges of a roof sheet is tighter than in the field, and an allowance that treats the whole roof uniformly is an allowance that is short at exactly the locations where wind uplift is highest. The number is small and the consequence is not.

The lines that measure work

Work lines describe hours rather than tonnes, and they are the lines a buyer can influence most, because most of the work in a steel building can be moved between the factory and the site. Where it sits is a commercial choice that the quotation has already made on the buyer's behalf.

Drawing work, and whether it is a line at all

Shop drawings and the connection design behind them are the largest fixed cost in a small order and the most commonly buried. If there is no line for drawings, the cost is inside the tonnage rate, which means the buyer cannot tell whether the drawings are included or excluded. Ask for it as a separate line even if the total does not change, because a line can be argued about and an unstated inclusion cannot.

Fabrication hours, and the operations that dominate them

Fabrication is not one operation. Cutting, assembly, welding, drilling, surface preparation and painting each behave differently, and the one that dominates a given building depends on the design. A frame with many small members costs more in handling than a frame with few large ones, and a frame with full-penetration welds costs more in welding than one with fillet welds throughout. Ask which operation dominates and listen for whether the answer matches the drawing.

Erection, and why it is usually excluded

Erection is excluded from most factory quotations, which is honest, because the supplier cannot control a site eight thousand kilometres away. What matters is whether the quotation says so explicitly and whether it offers any assistance: a lifting plan, a marked member schedule, a recommended sequence. A supplier who excludes erection and provides nothing to support it has excluded the risk without transferring any of the knowledge.

The lines that measure risk

These lines have no physical quantity. They are priced allowances for events that may not happen, and because they cannot be checked, they are the lines most often used to make a total look better than the building is.

Freight, and the allowance hidden inside it

Freight is quoted as an allowance when the supplier is not certain of the volume, and an allowance is a guess with a margin. Ask whether the freight line is based on a calculated container count or on an estimate, and ask for the volume it assumes. If the steel is packed badly, the volume grows and the freight allowance is exceeded, and the conversation about who pays happens after the containers are already booked.

Currency, validity and escalation

Steel moves, so a quotation has a validity period and often an escalation clause. Read both as risk lines: a short validity with an escalation formula transfers price risk to the buyer, while a long validity with a fixed price transfers it to the supplier and is usually paid for in the rate. Neither is wrong, but a buyer who has not noticed which one they are being offered is being told the price is one thing when it is another.

The tolerance clause, and what it quietly permits

Almost every quotation contains a phrase permitting normal fabrication tolerances. Written as a number, that phrase is a definition. Written as a phrase, it is a permission, and it will be interpreted against the buyer at the moment of dispute. Ask for the tolerance as a figure, in the units the drawings use, and ask which dimensions it applies to.

Reading the document as a whole

Once the lines have been sorted into steel, work and risk, the document can be read in a different order: not from the total backwards, but from the exclusions forwards. That reading produces a scope rather than a price, and a scope is what the order will actually be built from.

Two readings, and which one to send back

The first reading answers whether the price is acceptable. The second answers whether the building is the one that was asked for. Send the second reading back to the supplier as a list of questions rather than as a counter-offer, because a supplier who is asked to explain lines will often correct the document, and a corrected document is worth more than a discount on an unclear one.

The one line worth adding yourself

If a line is missing and the supplier will not add it, add it yourself as an assumption stated in the order: the coating thickness, the bolt grade, the tolerance, the wind speed. A written assumption that the supplier accepts becomes part of the contract by silence. It is the cheapest way for a buyer to close a scope gap without a negotiation.