When three offers arrive from three pre engineered steel building manufacturer candidates, the price per kilogram rarely tells the full story. The offers often cover different design loads, steel grades, coating systems and documents, so the comparison must start with scope.
Start from a common design basis
Give every bidder the same loads, code and building geometry, and ask each to confirm them in writing. If one bidder assumes a lower wind speed or ignores a collateral load, its weight and price will be lower for a reason that has nothing to do with efficiency. Our guide to loads on a steel building lists the items to fix.
Compare the structure line by line
Ask each manufacturer to list the primary frames, secondary members, bracing and accessories separately. Then compare:
- Primary frame section sizes and plate thicknesses
- Steel grade and its governing specification
- Purlin and girt sections and spacing
- Bracing system and anchor bolt size
- Total steel weight, split by part
A difference in weight is only a warning if you can see where it comes from. The article on comparing steel structure quotations shows eight line items that often differ.
Check how the steel is made
Ask where the primary frames are welded and what quality system the workshop holds. A manufacturer with a controlled welding process can show welding procedures, inspection records and member identification. Our overview of the welding procedure specification explains what to request.
Check coating and corrosion protection
The same frame will last differently in an inland warehouse and a coastal plant. Compare surface preparation, paint layers and dry film thickness, or galvanizing where specified. See Sa 2.5 blast cleaning for what the preparation standard requires.
Check what is excluded
Exclusions explain many price gaps. Look for foundations, anchor bolts, cladding, insulation, erection, crane, transport to site and permits. A low offer that leaves out cladding and anchor bolts is not comparable with a complete one.
Check documents and schedule
Ask for the drawing submission schedule, the fabrication period and the shipping plan. A pre engineered steel buildings project needs approved drawings before production, so the real start date follows your approval. Our article on lead time shows what controls it.
Check the pre-engineered steel building manufacturer's own evidence
Ask for the factory address, certificates with scope and a project reference of similar type. At Truong Thinh the information is public on our PEB manufacturer page, and the same questions should be put to every bidder. For a general description of the building system, see the entry on pre-engineered buildings. Where an industrial steel building has crane loads, also confirm the runway beam design.
A scoring sheet for technical offers
Build a sheet with the headings below and fill it for each bidder.
- Design basis confirmed in writing: yes or no
- Steel grades and thicknesses listed
- Welding procedure and inspection records offered
- Coating system and thickness stated
- Exclusions listed clearly
- Drawing and delivery schedule provided
- References for similar projects
Add price only after these lines are complete. This keeps attention on what is being supplied and avoids choosing a lower price that hides gaps.
Clarification round
Send each bidder a short list of clarification questions based on the sheet. The replies show how a pre engineered steel building manufacturer handles the interface with the customer. Slow or vague answers during the tender are a preview of the project.
Award and contract points
Once you decide, write the agreed assumptions into the contract: design code, loads, steel grade, coating, drawing approval time and defect handling. Our guide on how to choose a steel structure manufacturer lists further contract points. Ask the manufacturer to include the PEB weight table as a contract appendix, so later changes can be priced against it.
To receive a comparable offer, request a fabrication quotation with your drawings or loads, and we will list what we assume and what we need confirmed.
Frequently Asked Questions
Is the lowest-weight offer the best one?
Not necessarily. Lower weight may reflect lower assumed loads, thinner plates or exclusions. Confirm the design basis first.
How many offers should I request?
Three comparable offers are usually enough to understand the market.
Should the manufacturer design to my local code?
Yes, if your project specification requires it. State the code and load values so that all bidders design to the same basis.
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