Use Case Comparison

As-Built Drawings vs Shop Drawings: Understanding the Difference

An expert comparison to help you choose the right equipment for your project.

Feature	As-Built Drawings	Shop Drawings
Purpose	Document actual constructed conditions	Guide fabrication and installation of building components
Created	After construction or at any point for existing buildings	Before construction/fabrication begins
Created By	Surveyor, scanning technician, contractor	Subcontractor, fabricator, or manufacturer
Content	Actual dimensions, locations, and conditions	Fabrication details, dimensions, materials, connections
Direction	Backward-looking (what was built)	Forward-looking (how to build it)
Submittal Required	At project closeout	Before fabrication/installation
Service Pricing	$3,000-$50,000+ depending on building size and complexity	Included in subcontractor/fabricator contract

Pricing shown reflects average US rates. Actual costs vary by location based on local market conditions, regulations, and project logistics — both within the US and internationally. Get a custom quote

Option A Post-Construction Documentation

As-Built Drawings

Document What Was Actually Built

As-built drawings document what was actually built — the final, real-world conditions of a completed structure. They capture deviations from original design, field modifications, and the current state of all building systems.

Pros

Shows actual reality — verified field conditions
Essential for renovation and facility management
Captures all changes and deviations
Required for certificate of occupancy
Creates permanent building record

Cons

Created after construction (cannot prevent errors)
Requires field verification (site access)
Costs additional budget
Point-in-time accuracy

Best For

Project closeout documentationRenovation planningFacility managementInsurance documentationLegal records

Option B Pre-Construction Fabrication Guides

Shop Drawings

Guide Fabrication and Installation

Shop drawings are detailed fabrication drawings produced by contractors, subcontractors, or manufacturers showing how specific building components will be manufactured and installed. They translate design intent into buildable detail.

Pros

Prevents fabrication errors before they happen
Shows exact manufacturing details
Enables coordination between trades
Required by contract for most systems
Catches design conflicts early

Cons

Based on design intent — may not match field conditions
Does not reflect field changes during construction
Requires architect/engineer review and approval
Can be hundreds of pages for complex systems

Best For

Steel fabricationMEP system installationCurtain wall detailingPrecast concreteCustom millwork

Our Expert Verdict

Depends on Your Needs

As-built drawings and shop drawings serve fundamentally different purposes at different project stages. Shop drawings guide fabrication before construction; as-builts document reality after construction. Most projects need both.

Choose As-Built Drawings if...

You need as-built drawings for project closeout, renovation planning, or documenting existing conditions.

Choose Shop Drawings if...

You need shop drawings before fabrication or installation of building components — they tell manufacturers exactly what to build.

Frequently Asked Questions

Do shop drawings replace as-built drawings?

No. Shop drawings are pre-construction fabrication guides; as-built drawings are post-construction documentation of actual conditions. They serve different purposes at different project stages. Shop drawings say "build it this way"; as-builts say "this is what was actually built."

Who reviews shop drawings vs as-built drawings?

Shop drawings are reviewed and approved by the architect or engineer of record before fabrication begins. As-built drawings are typically reviewed by the owner, facility manager, or architect to verify accuracy against actual conditions.

When in a project do you need each?

Shop drawings are submitted before construction/fabrication begins (often weeks or months ahead). As-built drawings are created during or after construction, with final as-builts required before certificate of occupancy.

Can as-built drawings be created from shop drawings?

Not reliably. Shop drawings show design intent for fabrication, but field conditions, installation variations, and change orders mean the final construction often differs from shop drawings. As-builts must be verified against actual conditions.

Which is more detailed — shop drawings or as-built drawings?

Shop drawings are more detailed for specific components (exact bolt patterns, weld specifications, material grades). As-built drawings are more comprehensive for overall building documentation (entire floor plans, all systems, actual dimensions).

Do contractors need to update shop drawings to as-built?

Some contracts require contractors to redline shop drawings with field changes to create as-built documentation. However, this approach is less accurate than independent field verification through methods like 3D laser scanning.

How does 3D scanning relate to shop drawings and as-builts?

3D scanning is used to create as-built drawings — it documents what was actually built. Scan data can also be compared against shop drawings to verify that fabrication and installation match the approved shop drawing specifications (quality control).

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