Who Creates As-Built Drawings? Roles and Responsibilities Explained

As-built drawings are one of the most commonly required and least clearly assigned deliverables in construction. When disputes arise about incomplete or inaccurate as-builts, the first question is always: whose job was it?

The general contractor's role

The general contractor is typically responsible for delivering the as-built package at project close-out. This means:

• Coordinating as-built markups from all subcontractors throughout the project
• Maintaining a set of drawings that reflects field changes as they happen (not trying to reconstruct everything at the end)
• Consolidating subcontractor markups into a complete set
• Delivering the package to the owner at close-out

The practical challenge: GCs are often juggling multiple projects and the as-built package gets assembled at the end under time pressure, from notes and markups that weren't maintained consistently during construction. This is why as-built quality is often poor.

Subcontractor responsibilities

Each specialty subcontractor is responsible for as-built documentation within their scope:

• Mechanical subcontractor — ductwork routing, equipment locations, control systems as installed
• Electrical subcontractor — conduit routing, panel schedules, device locations, wire runs as installed
• Plumbing subcontractor — pipe routing, fixture locations, valve locations as installed
• Structural steel subcontractor — connection details and member sizes as fabricated and erected

The standard requirement is that each subcontractor maintains a set of job-site drawings and marks up field changes as they occur. These markups are then compiled by the GC into the overall as-built set.

The design team's role

Architects and engineers may or may not be responsible for updating the official design documents to reflect as-built conditions. This depends on what's in the contract.

Common arrangements:

• Contractor-produced as-builts — the GC and subs deliver a set of marked-up drawings showing changes. The design team is not involved in updating the documents.
• Design team record drawings — the contractor delivers markups, and the architect/engineer uses them to formally update the CAD drawings, delivering a clean record set.
• Joint responsibility — the design team processes shop drawings and RFIs and updates the model or drawings as changes are approved, with final confirmation from the contractor.

The owner's interest

Owners often don't know they should be asking for as-builts until they need them. Smart owners specify as-built requirements explicitly in the contract, including format requirements, delivery timeline, and what happens if the as-builts are incomplete or inaccurate.

For facility managers who will operate the building long-term, accurate as-builts are essential for maintenance planning, emergency response, and future renovations.

When as-built responsibility isn't clearly defined

When contracts don't clearly define who creates as-built drawings, responsibility typically falls on the GC by default — but disputes are common. The most protective approach for any party is to document their own scope regardless of what others do. If you installed it, photograph it. If you modified it from the drawings, note it. Your own documentation protects you regardless of what happens with the overall as-built package.

How phone-based tools change the as-built workflow

The traditional as-built process — manual measurement, drawing markup, CAD update — is slow, expensive, and often skipped. Modern phone-based tools make it practical to capture field conditions continuously throughout a project rather than trying to reconstruct them at close-out.

Manifold lets any team member photograph site conditions with GPS tagging and timestamps throughout the project. At close-out, the complete photo and 3D record is already assembled — no scramble to document what was done months ago.

See how Manifold captures as-built records → or start a free trial.