I Already Have Factory Drawings. Can a Chinese Steel Structure Manufacturer Quote Directly?
In many overseas steel structure projects, buyers contact a Chinese manufacturer after the factory layout or building drawings have already been prepared.
A common question is simple:
“I already have factory drawings. Can you quote directly from them?”
In many cases, the answer is yes — but the accuracy of the quotation depends heavily on what information is actually contained in those drawings.
A general architectural drawing may be enough for a preliminary budget, while a complete structural drawing package can allow a manufacturer to prepare a much more detailed quotation.
For buyers, understanding this difference is important. Sending drawings does not automatically mean every supplier is pricing exactly the same scope.
This guide explains what a Chinese steel structure manufacturer can normally quote from, what may still be missing, and what buyers should confirm before comparing prices.
Yes, a Manufacturer Can Usually Start from Your Existing Drawings
If you already have factory drawings, they can provide a much better starting point than a simple building size such as “100 m × 50 m × 10 m”.
Depending on the level of detail, drawings may already show:
- Building length and width
- Eave height and ridge height
- Column spacing
- Clear spans
- Roof slope
- Door and window positions
- Office areas
- Mezzanines
- Crane positions
- Equipment zones
- Roof and wall systems
This information helps the manufacturer understand the building configuration and prepare an initial structural proposal.
However, the manufacturer still needs to determine whether the drawings are suitable for a preliminary quotation or detailed pricing.
First Check: What Type of Drawings Do You Have?
Not all factory drawings contain the same amount of information.
Before requesting a steel structure quotation, it is useful to identify which type of drawings you already have.
1. Architectural Drawings
Architectural drawings normally show the building layout, elevations, dimensions, doors, windows and functional areas.
These drawings are useful for understanding the project, but they often do not contain enough structural information to calculate the final steel quantity accurately.
A manufacturer may still prepare a preliminary proposal based on the architectural drawings together with the project design conditions.
2. Structural Design Drawings
If structural drawings have already been completed, the manufacturer can normally evaluate the project in much greater detail.
These drawings may include:
- Column sections
- Beam sections
- Bracing systems
- Connection concepts
- Foundation reactions
- Material grades
- Design notes
This information can significantly improve quotation accuracy.
3. Fabrication or Shop Drawings
If the project already has approved shop drawings or fabrication drawings, the quotation can be based on much more specific member sizes, plates, connections and quantities.
However, the manufacturer still needs to review whether the drawings match the intended fabrication standards, material availability and production requirements.
Buyers can also review our guide on steel building shop drawings and the details that should be confirmed before fabrication.
Architectural Drawings Alone May Not Be Enough for a Final Quote
This is one of the most important points for international buyers.
A factory layout can show what the building looks like, but it does not always show how the steel structure should be designed.
For example, two factories with the same dimensions may require very different steel quantities because of differences in:
- Wind load
- Snow load
- Seismic conditions
- Crane loads
- Mezzanine loads
- Roof equipment
- Column spacing
- Clear-span requirements
- Local design standards
This means that a quotation based only on building dimensions can be useful for budgeting, but it should not automatically be treated as the final project price.
The Manufacturer Still Needs the Project Location
Even if your drawings are complete, the project location remains important.
A steel structure in one country may require a different structural design from an apparently identical building in another country.
The manufacturer may need information such as:
- Country
- City or project location
- Local wind conditions
- Snow conditions where applicable
- Seismic requirements
- Applicable design code
These factors affect structural calculations and therefore influence member sizes and steel quantity.
For this reason, buyers should avoid comparing quotations if suppliers are using different design assumptions.
Does Your Factory Need an Overhead Crane?
For industrial factory buildings, crane information can have a major influence on the steel structure.
If your factory requires an overhead crane, the manufacturer should normally know:
- Crane capacity
- Number of cranes
- Crane span
- Crane working level
- Operating requirements
- Crane runway arrangement
The main columns and crane-supporting structure may need to be designed around these loads.
If crane information is missing from the drawings, the manufacturer should not simply assume that the factory is a standard warehouse building.
What About Mezzanines, Platforms and Production Equipment?
Factory buildings often contain much more than an empty steel frame.
A buyer may need:
- Office mezzanines
- Equipment platforms
- Pipe racks
- Maintenance platforms
- Production equipment supports
- Special openings
- Future expansion areas
If these loads interact with the main steel structure, they should be identified before the final quotation is prepared.
Otherwise, the supplier may quote only the basic building shell while the buyer expects additional structural systems to be included.
Roof and Wall Specifications Also Affect the Quote
The steel frame is only part of a factory building quotation.
Buyers should check whether the drawings already define the roof and wall systems.
Typical information may include:
- Single steel sheet or sandwich panel
- Panel thickness
- Insulation requirements
- Roof color
- Wall color
- Skylights
- Ventilation openings
- Gutters and downpipes
- Doors and windows
If one supplier includes these items while another quotes only the structural steel, the total prices cannot be compared directly.
Can the Manufacturer Quote from a BOQ?
If you already have a BOQ, material list or steel quantity schedule, it can be very helpful.
A BOQ can allow the manufacturer to understand the expected supply scope more quickly.
However, the manufacturer should still cross-check the BOQ against the drawings.
Possible differences may exist between:
- Drawing revisions
- Member quantities
- Steel grades
- Connection materials
- Bolts
- Purlins
- Bracing
- Roof and wall accessories
A BOQ should therefore be treated as part of the project information rather than the only basis for quotation.
Preliminary Quote vs Detailed Quote
Buyers should clearly understand whether they are receiving a preliminary budgetary quotation or a detailed project quotation.
Preliminary Quotation
A preliminary quotation may be suitable when you have:
- Architectural drawings
- Basic dimensions
- Project location
- General building use
- Basic roof and wall requirements
The purpose is normally to establish a budget range and determine whether the project is commercially feasible.
Detailed Quotation
A more detailed quotation normally requires clearer technical information, including structural requirements, design conditions, material specifications and supply scope.
The more complete the information, the less room there is for different assumptions between buyer and manufacturer.
Why Can Different Chinese Manufacturers Quote Very Different Prices from the Same Drawings?
This is another common buyer question.
Even when several manufacturers receive the same drawing package, their quotations may still be different.
The difference may come from:
- Different structural assumptions
- Different steel quantities
- Different material grades
- Different connection details
- Different surface-treatment specifications
- Different roof and wall materials
- Different quotation scopes
- Different packing methods
- Different shipping terms
A lower total price does not necessarily mean the manufacturer is more competitive.
It may simply mean that the quotation excludes items included by another supplier.
This is why buyers should compare both technical scope and commercial scope.
Check What Is Included in the Steel Structure Quotation
Before comparing prices, ask each manufacturer to confirm what is included.
Depending on the project, the quotation may cover:
- Main steel frames
- Secondary steel
- Bracing
- Connection plates
- High-strength bolts
- Ordinary bolts
- Purlins
- Roof panels
- Wall panels
- Flashing
- Gutters
- Downpipes
- Doors and windows
- Design or drawing services
- Packing
- Container loading
Do not assume that every supplier uses the same quotation boundary.
EXW, FOB or CIF?
The trade term also affects the final number shown on the quotation.
For example:
- EXW generally covers supply from the factory, with the buyer arranging onward transport.
- FOB generally includes delivery and export handling to the agreed Chinese port under the applicable trade terms.
- CIF includes additional ocean freight and insurance to the agreed destination port under the applicable trade terms.
When comparing two quotations, buyers should first confirm that the trade terms are the same.
A lower EXW quotation should not be compared directly with another supplier’s CIF quotation.
Should the Chinese Manufacturer Redesign the Structure?
This depends on the project.
Some buyers already have complete structural drawings and want the Chinese manufacturer mainly to fabricate according to the approved design.
Other buyers have only architectural or preliminary drawings and require the manufacturer to develop the steel structural proposal.
These are two different project situations.
Before quotation, the buyer should clarify whether the supplier is expected to:
- Quote according to existing structural drawings
- Review the existing design
- Optimize the steel structure
- Develop a new structural solution
- Prepare fabrication drawings after order confirmation
The responsibility for design approval should also be clearly defined according to the requirements of the specific project.
What Files Should You Send to the Manufacturer?
If you already have drawings, the most useful approach is to send the complete available package rather than only screenshots.
Useful files may include:
- Architectural drawings
- Structural drawings
- PDF drawings
- CAD drawings where available
- BOQ or material list
- Design specifications
- Crane information
- Roof and wall specifications
- Project location
- Destination port
If some information is not yet available, identify it clearly rather than leaving the manufacturer to make assumptions.
For projects at an earlier stage, see our guide on what information to prepare before requesting a steel structure building quotation.
What Should You Ask the Manufacturer After Sending the Drawings?
Instead of asking only “What is your price?”, buyers can ask several more useful questions:
- Is the quotation based directly on my drawings or on your own structural proposal?
- Which steel grades are included?
- What structural scope is included?
- Are roof and wall systems included?
- Is surface treatment included?
- Are connection bolts included?
- Are shop drawings included?
- What packing method is included?
- What trade term is quoted?
- Which items are excluded?
These questions help the buyer understand whether two quotations are actually comparable.
Do Not Send Only Drawings and Ask for the Lowest Price
For an international factory project, the objective should not be to obtain the lowest number as quickly as possible.
The objective should be to obtain a quotation based on a clearly defined technical scope.
If suppliers make different assumptions, the cheapest quotation may later require additional costs for missing steel, different materials, additional accessories or design changes.
A well-prepared quotation process reduces these uncertainties before the order is placed.
How Xinguangzheng Reviews Factory Project Drawings
Qingdao Xinguangzheng Steel Structure Co., Ltd. works with overseas project owners, contractors and industrial buyers on steel structure factories, warehouses, workshops and other industrial buildings.
If a buyer already has project drawings, they can be used as the starting point for technical review and quotation preparation.
The first step is to understand the drawing package, project location, building use and expected supply scope.
If key structural information is missing, those points should be clarified before the quotation is treated as a final commercial comparison.
This helps reduce the risk of comparing prices based on different assumptions.
You can also view Xinguangzheng’s completed steel structure projects to see examples of factories, warehouses, workshops, hangars and other overseas steel buildings.
Already Have Factory Drawings? Send Them for Review
If you already have factory drawings and are looking for a steel structure manufacturer in China, you do not need to start the discussion from zero.
Send the available drawings together with your project location, building use and expected supply scope.
We can first review whether the information is sufficient for a preliminary or detailed quotation and identify the main points that still need confirmation.
Contact Xinguangzheng to discuss your factory steel structure project.
