Shop Drawings vs. Construction Drawings: What Is the Difference?

Shop drawings and construction drawings are both essential to a construction project, but they are not the same type of document.

Construction drawings communicate the designer’s requirements for the completed building. Shop drawings show how a specific contractor, supplier, manufacturer, or fabricator proposes to provide part of that work.

The simplest distinction is:

Construction drawings define what must be built. Shop drawings explain how a specific product, assembly, or system will be supplied, fabricated, coordinated, or installed.

The two document types work together, but they are prepared by different parties, contain different levels of detail, and serve different purposes.

Shop Drawings vs. Construction Drawings at a Glance

Topic	Construction drawings	Shop drawings
Primary purpose	Communicate the design and contract requirements	Show the specific product, assembly, or fabrication proposed
Typically prepared by	Architects, engineers, and other design consultants	Contractors, subcontractors, suppliers, manufacturers, or fabricators
Issued when	Before tender and construction, with revisions during the project	After contract award and before procurement, fabrication, or installation
Level of detail	Overall design, layout, performance, materials, and system requirements	Product-specific, fabrication-specific, installation-specific, or coordination-specific information
Project-specific	Yes	Yes, when properly prepared
Part of the original contract documents	Usually yes	Usually not part of the original contract set, subject to the project agreement
Used for fabrication	Generally not by themselves	Often yes, after the required review process
Reviewed by consultant	Prepared or coordinated by the consultant team	Reviewed by the relevant consultant for general conformity with the design intent and contract requirements
Field dimensions	May show design dimensions	Often requires contractor or fabricator verification
Product selection	May identify basis-of-design products or acceptable requirements	Identifies the actual proposed manufacturer, model, size, options, and accessories
Coordination responsibility	Coordinates the design disciplines	Must be coordinated by the contractor with actual products, trades, and field conditions

What Are Construction Drawings?

Construction drawings are documents prepared by the project’s design team to communicate the intended construction.

Depending on the project, the design team may include:

• Architect
• Mechanical engineer
• Electrical engineer
• Structural engineer
• Civil engineer
• Landscape architect
• Interior designer
• Fire-protection consultant
• Controls consultant
• Specialty consultants

Construction drawings are often issued together with project specifications and other contract documents.

They describe the work that the contractor is expected to provide.

What Do Construction Drawings Include?

Construction drawings may include:

• Site plans
• Floor plans
• Reflected ceiling plans
• Elevations
• Sections
• Details
• Equipment schedules
• Room layouts
• Ductwork layouts
• Piping layouts
• Plumbing layouts
• Electrical power layouts
• Lighting layouts
• Structural framing
• Control diagrams
• Fire-protection layouts
• Demolition plans
• Phasing information
• General notes

These drawings communicate the design intent and establish the arrangement, performance, materials, dimensions, and interfaces required for the project.

However, construction drawings do not usually contain every fabrication or product-specific detail needed to manufacture and install the work.

That additional information is often developed through shop drawings.

What Are Shop Drawings?

Shop drawings are project-specific documents that show how a contractor, subcontractor, supplier, manufacturer, or fabricator proposes to provide part of the work.

The term “shop drawing” can refer to more than a traditional drawing.

A shop drawing package may include:

• Product data
• Fabrication drawings
• Equipment schedules
• Certified performance selections
• Wiring diagrams
• Control schematics
• Installation details
• Coordination drawings
• Calculations
• Material samples
• Certifications
• Test reports
• Manufacturer literature

A complete shop drawing should identify the actual product, material, system, or assembly proposed for the project.

Who Prepares Construction Drawings?

Construction drawings are generally prepared by the project’s architects, engineers, and design consultants.

The consultant team develops the design based on:

• Owner requirements
• Applicable codes
• Performance criteria
• Available infrastructure
• Site conditions
• Coordination between disciplines
• Project budget
• Project schedule
• Regulatory requirements

The consultants may also revise the drawings during construction through addenda, supplemental instructions, change documents, or other formal processes.

Who Prepares Shop Drawings?

Shop drawings are commonly prepared by:

• General contractors
• Subcontractors
• Manufacturers
• Suppliers
• Fabricators
• Specialty contractors
• Delegated design professionals

The responsible party depends on the type of submission.

For example:

• A fan manufacturer may prepare certified fan selections.
• A pump supplier may provide pump curves and motor information.
• A sheet-metal contractor may prepare duct coordination drawings.
• A structural-steel fabricator may prepare fabrication drawings.
• A controls contractor may prepare wiring diagrams and points lists.
• A curtain-wall supplier may prepare engineered system details.
• A millwork fabricator may prepare casework elevations.
• A fire-protection contractor may prepare sprinkler layout drawings.

The general contractor typically reviews and coordinates the submission before forwarding it to the consultant.

The Main Difference: Design Intent vs. Specific Solution

Construction drawings communicate the design intent and required outcome.

Shop drawings communicate the specific solution proposed to satisfy that intent.

For example, a mechanical construction drawing may show:

• A supply fan identified as SF-1
• Required airflow
• Required static pressure
• Motor characteristics
• Connection sizes
• Location
• Controls requirements
• Accessories
• General installation arrangement

The fan shop drawing may then show:

• Exact manufacturer
• Exact model
• Fan size
• Wheel type
• Fan speed
• Certified performance
• Fan curve
• Brake horsepower
• Motor selection
• Sound data
• Dimensions
• Weight
• Materials
• Coating
• Vibration isolation
• Selected accessories
• Connection arrangement

The construction drawing establishes the required performance. The shop drawing shows the specific fan proposed to meet it.

Difference in Level of Detail

Construction drawings provide the level of detail needed to communicate the design and establish the contract requirements.

Shop drawings provide the additional level of detail required for product selection, fabrication, coordination, installation, or procurement.

Construction drawing detail may include

• System layout
• Design flow
• Equipment capacity
• General dimensions
• Required materials
• Connection sizes
• Major accessories
• Design criteria
• Typical details
• Control intent

Shop drawing detail may include

• Exact product dimensions
• Fabrication dimensions
• Connection orientation
• Selected materials
• Selected accessories
• Motor and electrical data
• Maintenance clearances
• Product-specific controls
• Certified performance
• Installation requirements
• Weight and support loads
• Field assembly requirements

Shop drawings should not simply copy the construction drawings. They should add the specific information needed to execute the work.

Are Construction Drawings Contract Documents?

Construction drawings are commonly part of the contract documents.

The full contract package may also include:

• Specifications
• Agreement
• General conditions
• Supplementary conditions
• Addenda
• Schedules
• Amendments
• Other listed documents

The contract documents define the obligations of the parties and establish the requirements for the project.

The exact list of contract documents depends on the agreement.

Are Shop Drawings Contract Documents?

Shop drawings are generally not part of the original contract documents unless the contract specifically states otherwise.

However, reviewed shop drawings can still become important project records.

They may be used to:

• Confirm the product selected
• Guide fabrication
• Coordinate installation
• Document reviewed information
• Support commissioning
• Support operations and maintenance
• Assist with future renovations
• Demonstrate how part of the work was executed

A reviewed shop drawing does not normally override the contract drawings or specifications unless the change is formally accepted through the project’s change process.

The contract should always govern.

Do Shop Drawings Override Construction Drawings?

Generally, no.

A shop drawing is intended to demonstrate how the contractor proposes to comply with the contract documents. It should not silently change the design requirements.

When a shop drawing differs from the construction drawings or specifications, the deviation should be identified clearly.

Examples include:

• Different manufacturer
• Different material
• Increased equipment size
• Different connection arrangement
• Different electrical characteristics
• Reduced capacity
• Alternate control sequence
• Omitted accessory
• Changed finish
• Different support arrangement

The deviation may require:

• Consultant review
• Owner acceptance
• Substitution approval
• RFI response
• Change order
• Electrical redesign
• Structural review
• Coordination with other disciplines

Submitting a different product without identifying the deviation creates risk for the contractor and the project team.

What Is the Difference Between Design Drawings and Shop Drawings?

The term “design drawings” is commonly used to describe drawings prepared by architects and engineers.

In many situations, design drawings and construction drawings refer to the same general group of consultant-prepared documents.

However, “design drawings” may also describe documents issued at an earlier stage, such as:

• Schematic design
• Design development
• Permit submission
• Tender submission
• Issued for construction

Shop drawings are different because they are generally prepared after the design has been developed and after a contractor or supplier has selected a specific product or fabrication method.

What Are Issued-for-Construction Drawings?

Issued-for-construction drawings, often called IFC drawings, are the version of the consultant’s drawings authorized for construction use.

They typically incorporate:

• Tender revisions
• Addenda
• Permit comments
• Owner changes
• Coordination changes
• Final design updates

Contractors should prepare shop drawings using the latest applicable construction documents.

Using an older drawing revision can lead to:

• Incorrect product selections
• Wrong connection sizes
• Coordination conflicts
• Missing accessories
• Incorrect dimensions
• Resubmissions
• Rework

The shop drawing cover sheet should identify which drawing and specification revisions were used.

What Is the Difference Between Shop Drawings and Coordination Drawings?

Coordination drawings show how multiple building systems and trades fit together in the available space.

They may include:

• Ductwork
• Piping
• Plumbing
• Electrical conduit
• Cable tray
• Fire-protection piping
• Structural elements
• Ceiling systems
• Access zones
• Equipment clearances

A coordination drawing may be considered a type of shop drawing or submittal, depending on the project requirements.

The main distinction is that product shop drawings focus on the proposed item or assembly, while coordination drawings focus on the spatial relationship between multiple systems.

What Is the Difference Between Shop Drawings and Fabrication Drawings?

Fabrication drawings provide the detailed information required to manufacture or assemble a component.

They may show:

• Exact dimensions
• Materials
• Welds
• Fasteners
• Connections
• Tolerances
• Piece marks
• Assembly sequences
• Cutting information
• Bending information
• Finishes

Fabrication drawings are often a type of shop drawing.

For example, structural-steel fabrication drawings, duct fabrication drawings, and millwork drawings may all be submitted as shop drawings.

What Is the Difference Between Shop Drawings and Product Data?

Product data usually consists of manufacturer information describing a product.

Examples include:

• Catalogue sheets
• Technical data
• Performance tables
• Installation instructions
• Material information
• Certifications
• Electrical information

Product data becomes project-specific when the actual model, size, material, accessories, and options are clearly identified.

A shop drawing package may include both drawings and product data.

The terms are sometimes used interchangeably in casual conversation, but contracts may treat them as separate submittal types.

What Is the Difference Between Shop Drawings and As-Built Drawings?

Shop drawings are generally prepared before fabrication or installation.

As-built drawings are prepared or updated to record what was actually installed.

Shop drawings show the proposed solution. As-built drawings show the completed condition.

For example:

• A duct shop drawing may show the coordinated duct route planned before installation.
• The as-built drawing should record the final route, including changes made during construction.

A reviewed shop drawing should not automatically be treated as an as-built record because field conditions may have changed after the review.

Example: Air-Handling Unit

A construction drawing may show:

• AHU tag
• Airflow
• Heating and cooling capacity
• Filter requirements
• Fan arrangement
• Coil requirements
• Electrical characteristics
• Controls sequence
• Location
• Connection sizes

The AHU shop drawing may show:

• Manufacturer and model
• Unit dimensions
• Section arrangement
• Coil selections
• Fan curves
• Motor sizes
• Filter configuration
• Casing construction
• Leakage performance
• Drain-pan construction
• Access-door locations
• Sound data
• Weight
• Shipping splits
• Controls
• Selected accessories
• Maintenance clearances

The consultant reviews the AHU submission against the design requirements. The contractor remains responsible for coordinating how the actual unit will be delivered, supported, connected, and installed.

Example: Variable Air Volume Box

A construction drawing or schedule may show:

• VAV box tag
• Maximum airflow
• Minimum airflow
• Inlet size
• Reheat capacity
• Control type
• Location

The VAV shop drawing may show:

• Manufacturer
• Model
• Exact inlet size
• Airflow range
• Sound performance
• Pressure requirements
• Casing construction
• Reheat-coil selection
• Water flow
• Pressure drop
• Controls package
• Damper actuator
• Access requirements
• Connection orientation

The shop drawing adds the project-specific selection needed for procurement and installation.

Example: Pump

A construction drawing or schedule may show:

• Pump tag
• Design flow
• Design head
• Motor requirements
• Pump type
• System served
• General arrangement

The pump shop drawing may show:

• Manufacturer
• Model
• Pump curve
• Duty point
• Impeller diameter
• Speed
• Efficiency
• Motor horsepower
• Electrical characteristics
• Net positive suction head
• Dimensions
• Weight
• Connection sizes
• Materials
• Accessories
• Base and isolation requirements

The shop drawing should demonstrate that the selected pump meets the scheduled duty point.

Example: Architectural Millwork

The architectural drawings may show:

• Millwork location
• Overall size
• General appearance
• Materials
• Finish
• Hardware requirements
• Relationship to walls and equipment

The millwork shop drawings may show:

• Exact fabrication dimensions
• Panel sizes
• Joint locations
• Edge details
• Hardware
• Supports
• Cut-outs
• Finishes
• Field dimensions
• Assembly details
• Installation details

The shop drawings convert the design intent into information that the fabricator can use.

Example: Structural Steel

The structural drawings may show:

• Member sizes
• Grid locations
• Design loads
• Framing arrangement
• General connection requirements

The structural-steel shop drawings may show:

• Piece marks
• Exact member lengths
• Connection details
• Bolt sizes
• Welds
• Plate dimensions
• Holes
• Camber
• Fabrication notes
• Erection information

Where connection design is delegated, a professional engineer retained by the contractor or fabricator may also provide sealed calculations and drawings.

How Are Shop Drawings Reviewed?

A typical review process is:

1. A supplier or fabricator prepares the shop drawing.
2. The subcontractor checks the selection and installation requirements.
3. The general contractor reviews the package for completeness and coordination.
4. The contractor applies its review stamp.
5. The package is submitted to the prime consultant.
6. The relevant architect or engineer reviews the information.
7. Comments and a review status are returned.
8. The contractor addresses the comments.
9. The package is revised and resubmitted where required.
10. The current reviewed version is distributed to the project team.

The exact process depends on the contract and project procedures.

What Does the Consultant Check?

The consultant generally reviews the shop drawing for general conformity with the design intent and relevant contract requirements.

The review may include:

• Product type
• Manufacturer and model
• Materials
• Capacity
• Performance
• Design operating conditions
• Major dimensions
• Connection requirements
• Required accessories
• Certifications
• Controls intent
• Compatibility with the designed system
• Disclosed deviations

The consultant’s review does not normally replace the contractor’s review of field dimensions, quantities, fabrication methods, installation sequencing, or coordination between trades.

What Does the Contractor Check?

Before submitting the shop drawing, the contractor should check:

• Correct project
• Correct specification section
• Correct equipment or product tags
• Latest drawings and specifications
• Exact manufacturer and model
• Selected sizes and options
• Required accessories
• Dimensions
• Field conditions
• Service clearances
• Connection sizes
• Electrical requirements
• Controls requirements
• Structural requirements
• Coordination with other trades
• Quantities
• Deviations
• Submission completeness

The contractor’s review should be completed before the package is sent to the consultant.

Why Shop Drawings Get Rejected

A shop drawing may be returned for revision when:

• The product does not meet the specification.
• The selected model is unclear.
• Required performance information is missing.
• Accessories are omitted.
• The package conflicts with the construction drawings.
• Dimensions do not fit the available space.
• Electrical information does not match.
• Controls requirements are incomplete.
• Deviations are not identified.
• The contractor review stamp is missing.
• Previous comments were not addressed.
• The submission uses outdated documents.

A complete pre-submission review can reduce many of these issues.

Can Construction Drawings Be Used Instead of Shop Drawings?

Construction drawings may provide enough information for some simple work, especially where the contract does not require a separate shop drawing.

However, they generally do not replace required shop drawings for products or assemblies that need:

• Specific selection data
• Fabrication details
• Coordination
• Certified performance
• Delegated design
• Manufacturer information
• Installation information
• Consultant review before procurement or fabrication

The contract documents should identify which shop drawings and submittals are required.

Can Shop Drawings Be Used for Construction?

Reviewed shop drawings may be used to support procurement, fabrication, coordination, and installation, subject to the project requirements.

However, they must be read together with:

• Construction drawings
• Specifications
• Consultant comments
• Addenda
• Change documents
• RFIs
• Reviewed revisions
• Manufacturer instructions

A shop drawing should not be used to ignore a conflicting contract requirement.

When a conflict exists, it should be resolved through the formal project communication process.

Common Misunderstandings

“The consultant prepared the shop drawing”

Usually, the consultant prepares the construction documents. The shop drawing is usually prepared by the contractor, supplier, manufacturer, or fabricator.

“A reviewed shop drawing changes the contract”

Not automatically. A change to the contract requirements generally requires the appropriate formal change process.

“The consultant checked every dimension”

Consultant review does not normally confirm all field or fabrication dimensions.

“A shop drawing is only a drawing”

A shop drawing package may contain product data, calculations, schedules, diagrams, performance selections, and certifications.

“Reviewed means no further action is required”

A status such as “reviewed as noted” still requires the contractor to incorporate and coordinate the comments.

“A generic catalogue is a shop drawing”

Generic literature may form part of the submission, but the actual project selection must be clearly identified.

Shop Drawings vs. Construction Drawings Checklist

Use this checklist when deciding which document contains the information you need.

Look at the construction drawings for:

• Design layout
• Equipment tags
• Required capacities
• System arrangement
• Required materials
• Design criteria
• Connection sizes
• Locations
• General details
• Controls intent
• Contract requirements

Look at the shop drawings for:

• Actual manufacturer
• Actual model
• Exact dimensions
• Selected materials
• Certified performance
• Product-specific connections
• Motor information
• Selected accessories
• Fabrication details
• Maintenance clearances
• Installation requirements
• Product-specific controls
• Identified deviations

Both documents should be reviewed together.

How AI Can Help Compare Shop Drawings With Construction Requirements

Reviewing shop drawings requires information from several sources.

A reviewer may need to compare:

• Product data
• Equipment schedules
• Specifications
• Construction drawings
• Controls requirements
• Previous review comments
• Addenda
• Consultant changes

AI-assisted review can provide an additional quality-control step by helping identify:

• Missing technical information
• Unmarked product selections
• Apparent specification mismatches
• Performance discrepancies
• Missing accessories
• Electrical inconsistencies
• Controls coordination items
• Potential deviations
• Information requiring consultant review

Shopdrawing.AI allows contractors, coordinators, designers, and project managers to upload a project specification and shop drawing package for a preliminary comparison before formal submission.

AI does not replace the contractor’s coordination responsibilities, professional judgment, or the consultant’s formal review.

Check a Shop Drawing Before Submission

Frequently Asked Questions

What is the main difference between shop drawings and construction drawings?

Construction drawings communicate the designer’s requirements for the completed project. Shop drawings show the specific product, assembly, fabrication, or installation proposed by the contractor, supplier, manufacturer, or fabricator.

Who prepares construction drawings?

Construction drawings are generally prepared by architects, engineers, and other design consultants.

Who prepares shop drawings?

Shop drawings are generally prepared by contractors, subcontractors, suppliers, manufacturers, fabricators, or delegated design professionals.

Are shop drawings more detailed than construction drawings?

Shop drawings are often more detailed for a particular product or assembly. However, construction drawings contain the broader design, system, and project requirements that the shop drawing must satisfy.

Are shop drawings part of the contract documents?

Shop drawings are generally not part of the original contract documents unless the agreement states otherwise. Their exact status depends on the project contract.

Do shop drawings override construction drawings?

Generally, no. A shop drawing should comply with the construction drawings and specifications. Any deviation should be identified and formally reviewed.

Can construction begin before shop drawings are reviewed?

The project contract and submittal requirements should govern. Proceeding before required review may expose the contractor to rework, replacement costs, delay, and coordination risk.

What is the difference between shop drawings and as-built drawings?

Shop drawings show what is proposed before fabrication or installation. As-built drawings record what was actually installed after construction.

Are product data sheets considered shop drawings?

Product data may be included within a shop drawing submittal. The actual model, size, options, materials, and accessories should be clearly marked.

Why are shop drawings reviewed by consultants?

Consultants review relevant shop drawings to determine general conformity with the design intent and contract requirements before the product or assembly is fabricated, procured, or installed.

Final Takeaway

Construction drawings and shop drawings serve different but connected purposes.

Construction drawings define the project’s design and performance requirements. Shop drawings translate those requirements into specific products, assemblies, fabrication details, and installation information.

The construction drawings tell the project team what is required.

The shop drawings show what is actually proposed.

A successful shop drawing should:

• Use the latest construction documents.
• Clearly identify the proposed product or assembly.
• Demonstrate required performance.
• Show relevant dimensions and connections.
• Include required accessories.
• Identify coordination requirements.
• Disclose every known deviation.
• Be reviewed by the contractor before consultant submission.

For more guidance, read:

• How to Review Shop Drawings Before Sending Them to the Consultant
• Why Shop Drawings Get Rejected
• Who Reviews Shop Drawings?
• What Should Be Included in a Shop Drawing Submittal?

You can also use our AI shop drawing review tool to compare a shop drawing against the applicable project specification.