What Drawings Are Needed for Custom Steel Structure? Complete Guide 2026

1. Drawing Types Overview

A complete steel structure project requires multiple sets of drawings, each serving a different purpose in the project lifecycle. Understanding these drawing types helps you communicate effectively with your manufacturer and avoid costly delays.

2. What You Need to Provide for Quotation

To receive an accurate and detailed quotation, provide as much of the following information as possible. Don't worry if you don't have formal drawings — even basic information is enough to start.

2.1 Minimum Information Required

• Building dimensions: Length × width × eave height (e.g., 60m × 24m × 8m)
• Building purpose: Warehouse, factory, workshop, hangar, etc.
• Crane requirements: Capacity, span, lifting height (if any)
• Project location: Country and city (for wind/snow load design and shipping)
• Insulation requirements: Single skin, sandwich panel, insulated panel

2.2 Recommended Additional Information

• Architectural drawings (PDF or CAD format) with layout and elevations
• Door and window positions and sizes
• Production equipment layout (for factory buildings)
• Mezzanine or office area requirements
• Local building code requirements (if specific standards needed)
• Site photos or survey data

2.3 If You Have No Drawings At All

That's completely fine! Many of our clients start with just a hand sketch on paper or basic dimensions. Our engineering team can develop complete design drawings from your requirements. We offer free initial design consultation and can produce concept drawings within 2-5 business days.

3. Complete Design Drawing Sets We Provide

Once you place an order, our engineering team produces comprehensive drawing sets for every project. Here's what's included:

3.1 Architectural Design Drawings

• Site plan showing building position and orientation
• Floor plans with dimensions, door/window schedules
• All four elevation drawings showing building appearance
• Cross-section and longitudinal section drawings
• Roof plan showing slope, gutters, and roof openings
• Door and window detail drawings

3.2 Structural Design and Calculations

• Structural calculation report (PDF, 30-80 pages) including:
  • Load analysis (dead load, live load, wind load, snow load, crane load)
  • Member size verification (columns, beams, bracing, purlins)
  • Connection design verification (welds, bolts, base plates)
  • Deflection and vibration check
  • Foundation load data for local civil engineer
• Design according to specified standard (GB 50017, ASTM AISC, EN 1993, AS 4100)
• Software used: SAP2000, ETABS, STAAD.Pro, Tekla Structures, 3D3S

3.3 Fabrication Drawings (Shop Drawings)

These are the most detailed drawings, used directly by our factory production team:

• Individual member drawings for each column, beam, and bracing member
• Detailed dimensions with tolerances (±1mm for critical dimensions)
• Hole positions and sizes (bolt holes, access holes)
• Welding details (weld size, weld type, welding symbol per standard)
• Material specification (steel grade, plate thickness, section size)
• Part marking system (each piece uniquely labeled for site identification)
• Bill of materials (BOM) with weights and quantities
• CNC cutting files for automated production (when applicable)

3.4 Installation Drawings (Erection Drawings)

These drawings guide your local installation team through the erection process:

• Foundation plan with anchor bolt positions and sizes
• Column layout plan with grid lines and column numbers
• Erection sequence diagram (step-by-step assembly order)
• Connection detail drawings (column-base, column-beam, beam-beam, bracing)
• Purlin and girt layout drawings
• Roof and wall cladding layout with sheet cutting list
• Door and window installation details
• Gutter and downpipe installation details
• General notes and safety requirements

3.5 3D Model and Visualization

• Tekla Structures 3D model (can be viewed with free Tekla BIMsight)
• 3D rendering images for client presentation
• Installation animation videos for complex connections
• Clash detection report (for complex projects with MEP integration)

4. Drawing Approval Process

1. Initial concept (Day 1-3): We review your requirements and produce initial layout concept.
2. Preliminary design (Day 4-10): Structural design begins, preliminary drawings produced for your review.
3. Client review (Day 11-17): You review drawings and provide feedback. We allow 1-2 revision rounds included in design fee.
4. Final design approval (Day 18-21): You sign off on final design drawings. This is the point where production can begin.
5. Fabrication drawings (Day 22-28): Detailed shop drawings produced for factory (may overlap with production start for standard items).
6. Production begins (Day 29+): Factory fabrication starts according to approved drawings.

5. Common Drawing-Related Mistakes to Avoid

• Skipping design approval: Never start production without written design approval. Changes after production starts are very expensive.
• Not reviewing anchor bolt positions: Anchor bolt layout must be verified before foundation concrete is poured. Mistakes here are extremely costly to fix.
• Ignoring revision history: Always use the latest revision of drawings. Old versions may have incorrect dimensions.
• Not providing equipment loads: For factory buildings, equipment weights and positions affect structural design. Provide complete equipment list.
• Assuming local standards: Clearly specify which design standard you need (GB, ASTM, EN, AS). Different standards produce different member sizes.
• Not coordinating with MEP: For buildings with HVAC, electrical, or plumbing, coordinate with MEP designers to avoid clashes with steel structure.

6. Drawing File Formats We Accept and Provide

7. Design Service Pricing

• Standard design package: 2-3% of project value (minimum $1,500)
• Free design: Waived for orders over $50,000 (most projects qualify)
• Concept design only: $300-$800 (credited toward order if placed within 3 months)
• Expedited design (2 weeks): +50% design fee surcharge
• Additional revision rounds: $200-$500 per round (2 rounds included)
• On-site design consultation: $200-$350/day per engineer plus travel costs