Project delivery

What are as-built drawings in construction?

As-built drawings are a marked-up set of the construction drawings that shows what was actually built, including every field change in dimensions, routing, and equipment location, turned over to the owner at closeout.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

As-built drawings, or as-builts, are the drawings that show the building as it really went in. The design drawings show intent. As-builts show where the conduit actually runs, where the sewer line actually crosses, and which wall the shutoff valve ended up on. They are usually kept as a red-lined field set during the job and handed to the owner as part of closeout.

Some specs separate the contractor's marked-up as-builts from record drawings, which the architect or engineer produces by folding those markups into clean CAD or BIM files. Others use the terms interchangeably. Check the closeout section of the specs.

How as-builts get made on a real job

Picture a $480,000 restaurant tenant improvement. During rough-in, the plumber finds a beam where the drawings show a clear path for the grease waste line. After an RFI and a field decision, the line drops below the beam and runs 6 feet east before turning down.

If nobody marks that on the drawings, the next contractor who cuts the slab for a floor sink in five years will hit it. So the plumbing foreman red-lines the change on the field set that week, with dimensions from a fixed gridline and the elevation. The superintendent checks the field set during weekly walks to make sure each trade is keeping up.

  • Changes in routing for pipe, duct, and conduit, with dimensions.
  • Concealed items: valves, cleanouts, junction boxes, and blocking above the ceiling.
  • Underground utilities with depth and tie-in points.
  • Equipment substitutions with model numbers.
  • Changes from approved RFIs, change orders, and field orders, with references.

Why as-builts hold up money

Most specs list as-builts as a closeout submittal, and many contracts tie final payment and release of retainage to receiving them. Trying to rebuild six months of field changes from memory in the last week is miserable and inaccurate. Subs who never kept a red-line set end up holding up retainage for the whole job.

Common as-built problems

  1. Waiting until the end. Field memory fades fast, and walls get closed.
  2. Red-lines with no dimensions, which are close to useless for future work.
  3. Several field sets drifting apart instead of one master set.
  4. Not photographing work before it is covered. Photos tied to locations are a cheap backup.
  5. Turning over drawings that do not match the O&M manuals equipment list.

Related terms

As-builts are part of project closeout along with the punch list, warranties, and O&M manuals. They draw on shop drawings and field changes logged in the daily log. The project closeout checklist lists as-builts with the other turnover items.

Frequently asked questions

Who is responsible for as-built drawings?

Usually the general contractor, who collects markups from each subcontractor. The contract or specs set who produces the final record set.

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

As-builts are the contractor's marked-up field drawings. Record drawings are often the clean set the design team produces from those markups. Some contracts use the terms the same way.

Do residential jobs need as-builts?

They are less often required, but marking where utilities, blocking, and shutoffs ended up is a service homeowners and future trades appreciate.

Can as-builts be digital?

Yes. Many teams mark up PDF sheets on tablets in the field, which keeps one master set and adds photos to each change.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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