Steel Estimating Services: What a Fabricator Quote Covers

A steel estimating service takes your structural drawings and turns them into a price: a take-off of every member, plate and connection, priced for material, detailing, fabrication, finishing, delivery and installation, with a written list of what's included and what isn't. When you ask a fabricator for a quote, that is the work behind the number. Knowing how it's built helps you send the right information, read the quote you get back, and compare quotes on equal terms.

This guide looks at estimating from the buyer's side. It doesn't give rates, because steel prices move with the mill market and every job is different. It explains what drives the price and how to get an accurate one.

What goes into a steel estimate

An estimator works through the drawings in layers:

1. The take-off. Every beam, column, brace, lintel, post and plate is listed with its size, length and quantity. Weights are calculated from the section tables. Connections are counted: shear tabs, end plates, base plates, cap plates, stiffeners, bolts and welds.
2. Material. The take-off is priced at current material costs, allowing for the lengths the steel comes in and the drop (offcuts) that can't be reused.
3. Detailing and engineering. Shop drawings, and connection design if the specification delegates it to the fabricator.
4. Shop labour. Cutting, drilling, coping, fitting, welding, cambering, grinding and marking. This is driven far more by piece count and connection complexity than by weight.
5. Finish. Bare steel, shop primer, a specified paint system or galvanizing (usually by a separate galvanizer).
6. Delivery. Number of loads, distance, any long or oversized pieces, and whether deliveries are phased.
7. Erection, if included. Crew time, crane, field bolting and welding, and site conditions.
8. Allowances and qualifications. Assumptions the estimator had to make where the drawings were incomplete.

This is why "price per tonne" figures you see online can mislead. Two jobs with the same tonnage can need very different amounts of work. We explain the per-tonne view and its limits in steel fabrication cost per tonne in Ontario.

What drives the price up or down

Things that add cost:

• Many small or unique pieces. Each one has to be detailed, handled, fitted and marked.
• Moment connections and full-penetration welds. More fitting, more welding, more inspection.
• Heavy plate work: built-up members, large base plates, stiffeners.
• Camber, curved members, or tight tolerances for architecturally exposed steel.
• Special finishes and their surface preparation.
• Incomplete drawings, which force the estimator to carry allowances.
• Difficult access on site: no crane access, steel carried in by hand, work inside an occupied building.

Things that help:

• Repetition. The same connection used many times is detailed once and fabricated efficiently.
• Bolted field connections where the design allows, so welding happens in the shop.
• Standard sizes that are readily available.
• Clear, complete drawings and early answers to questions.
• A realistic schedule that doesn't force overtime or split deliveries.

What a good steel quote includes

A useful quote isn't just a total. It defines scope. Look for:

If a quote doesn't mention an item, assume it's excluded until you've confirmed otherwise.

How to compare steel quotes

Quotes that look far apart are often pricing different jobs. Before comparing totals:

1. Check that every quote is based on the same drawing revision.
2. Build a scope grid using the table above and fill it in for each bidder.
3. Add back the missing pieces. If one quote excludes the crane or shop drawings, estimate what it would take to cover them.
4. Read the qualifications. A low price with a long list of exclusions and allowances may not stay low.
5. Ask about the assumptions. Where the drawings were unclear, what did each estimator assume?
6. Check certification and capacity, not just price. Our guide on how to choose a structural steel fabricator covers the rest of the vetting.

For residential jobs with one or two beams, the same principles apply on a smaller scale. Our checklist on how to request a steel beam quote shows what to send.

What to send for an accurate estimate

The quality of an estimate depends on what the estimator receives. For the tightest number, send:

• Complete structural drawings at the latest revision, with the general notes.
• The structural steel specification, which sets finish, inspection, connection design and shop drawing requirements.
• Architectural drawings where steel interfaces with stairs, openings, canopies or cladding.
• Your scope: supply only, supply and deliver, or supply and install.
• Site information: address, access for trucks and a crane, and any height or weight limits.
• Schedule: when you need anchor bolts, when steel is needed on site, and any phasing.

If the drawings aren't final, say so. An estimator can price preliminary drawings, but the quote should then say it's budgetary and list the assumptions, so nobody treats it as firm.

Why estimates change after award

A firm quote should hold for its stated scope and validity period. It changes when the job changes:

• Drawing revisions after the quote, especially added members or heavier sections.
• Connection design results that differ from what was assumed at bid time.
• Material price movement if the order is placed after the quote expires.
• Schedule changes that split deliveries or add mobilizations.
• Site conditions that differ from what the quote assumed.

The fix is simple: tell the fabricator which revision you're pricing, ask that the quote list its basis, and send revisions as soon as you have them.

Estimating services for rebar

Reinforcing steel is estimated differently: by bar size, length, bends and laps, converted to weight, then priced for fabrication and placing. If you want to check a rebar quantity yourself, our rebar calculator guide walks through the method, and how rebar is priced explains the cost side.

Getting an estimate from Procut

Send us your structural or architectural drawings and we'll prepare a detailed take-off and quote, free of charge. We estimate both structural steel and reinforcing steel, prepare shop drawings in-house once the job is approved, and fabricate, deliver and install across the GTA and Ontario. Tell us the drawing revision, your schedule and whether you need supply only or supply and install, and we'll price the scope you actually need.

Request a quote, or see our estimating, detailing and fabrication services.