What Are As-Built Drawings? Meaning, Examples and Requirements

No building is built exactly as drawn. Pipes are rerouted around beams, doors move a few inches, equipment is substituted, and the owner changes a room halfway through. The design drawings stop being accurate the day work starts. As-built drawings close that gap: they record what is actually in the walls, ceilings and ground, so the next person who works on the building is not guessing.

This guide explains what as-built drawings are, what they include, how they differ from record and shop drawings, who prepares them, and how to produce an as-built set that the owner will accept at closeout.

What Does “As-Built” Mean?

“As-built” means as actually constructed. An as-built drawing is a revised version of a design drawing that shows the final location, size and type of every element that was installed. In the field the term is usually shortened to as-builts, and you will also see it written as asbuilt, as-built plans or as-built sets.

The key difference from design drawings is intent. Design drawings show what the architect and engineers planned. As-built drawings show what the contractor built, including every deviation from the plan.

What As-Built Drawings Show

An as-built set covers the same sheets as the construction set, updated wherever the work changed. Typical changes recorded include:

Changes are usually highlighted with revision clouds and delta symbols, and a revision table on each sheet lists what changed and why.

As-Built Drawings vs. Record Drawings vs. Shop Drawings

These terms are often mixed up. They are related, but each has a different author and purpose:

In practice, many owners use “as-built drawings” and “record drawings” to mean the same final set. Your contract and specifications define which one you owe and in what format. For more on the drawing types, see our guides to shop drawings and types of construction drawings.

Who Prepares As-Built Drawings?

As-built information starts with the people who build the work:

• The general contractor keeps a master redline set on site and is usually responsible for delivering the as-built set at closeout.
• Subcontractors mark up their own trades, such as mechanical, electrical, plumbing and fire protection, and hand their redlines to the general contractor.
• A CAD drafter converts the redlines into clean, scaled drawings. This is often outsourced, because site teams rarely have time to redraw sheets at the end of a job.
• The architect or engineer may review the as-builts and issue the formal record set when the contract requires it.

When Are As-Built Drawings Required?

Requirements depend on the contract, the owner and the jurisdiction, but as-built drawings are commonly required:

• At project closeout, as part of the closeout package with warranties, O&M manuals and attic stock.
• Before final payment or release of retainage, when the specifications list as-builts as a closeout deliverable.
• On public and institutional projects, where owners usually specify the format, layering and file type in detail.
• For utilities and site work, where buried lines must be located accurately for future excavation.
• For facility management, when the owner plans to maintain the building from the drawings or a model.

Always check the closeout section of your specifications early in the project, so the field team records the right information as the work happens rather than trying to reconstruct it at the end.

As-Built Drawing Examples

Here is what as-built changes typically look like on different sheets:

• Architectural floor plan: a corridor wall shifted 8 inches to clear a duct riser, clouded and redimensioned, with the change order number in the revision table.
• Structural plan: a new slab opening added for a late equipment change, with the reinforcing detail referenced.
• Mechanical plan: a main duct rerouted below a beam instead of through it, with new elevations and the added fittings shown.
• Electrical plan: a panel relocated to the next room, with feeder routes and the panel schedule updated.
• As-built section: a ceiling section showing the actual stacking of duct, pipe and cable tray, with measured clearances.
• Site plan: a water line installed at a different depth and route, with tie-in points and measured offsets from fixed objects.

To see how a complete set is organized, look at our as-built CAD conversion samples.

How to Create As-Built Drawings

1. Keep a dedicated redline set on site. One master set, updated as work happens, not from memory at the end of the job.
2. Mark every change clearly. Use a consistent color, cloud the change, and note dimensions from fixed reference points.
3. Link changes to documents. Reference the RFI, change order or approved submittal next to each change.
4. Record concealed work before it is covered. Photograph and measure in-wall, in-ceiling and underground work before inspection close-in.
5. Collect trade redlines. Gather mechanical, electrical, plumbing and fire protection markups before the trades leave site.
6. Draft the changes in CAD. Update every affected sheet, add revision clouds and deltas, and keep the original title block and layering.
7. Review and deliver. Check the drafted set against the redlines, then deliver native DWG files and a PDF set in the format the specifications require.

Common As-Built Mistakes

• Waiting until closeout to collect redlines, when the people who made the changes have left the job.
• Recording changes without dimensions, so the location cannot be found later.
• Updating plans but not the sections, schedules or details affected by the same change.
• Missing concealed and underground work, which is the information owners need most.
• Delivering scanned redlines instead of clean CAD files when the contract asks for editable drawings.

As-Built Drawings for Existing Buildings

As-built drawings are also prepared long after construction, when an owner plans a renovation and the original drawings are missing or out of date. In that case the drawings are based on field measurements, laser scans or a surveyor’s data, and they show existing conditions before any new design starts. Starting a renovation from accurate existing-condition drawings avoids many surprises in both the design and the estimate.

As-Built Drawing Services: When to Outsource

Most contractors have the field knowledge but not the drafting time to produce a clean as-built set at the end of a job. Outsourcing the drafting lets the project team focus on punch lists and closeout while a drafter converts the redlines.

Our CAD drawing services include as-built drafting from redlines, change orders, field notes and scans, delivered as layered DWG files with print-ready PDFs. Every sheet is drawn and checked by a human drafter against your markups. If you also need fabrication drawings during construction, see our shop drawing services.

Part of Our Complete Guide

This article is part of our guide to construction drawings and documents, which explains each drawing type used from design through closeout.