What Are As-Built Drawings in Construction?
As-built drawings — also called as-builts or record drawings — are the design and construction drawings updated at the end of a project to show exactly how the works were actually built, rather than how they were originally designed. Every variation, site change, substituted material or relocated service that happened during construction gets marked up onto the drawing set, so the final document matches what is genuinely in the ground and in the building. As-built drawings are typically a contract deliverable, handed over to the client at practical completion alongside other close-out documentation, because they become the reference record used for maintenance, future renovations, and locating services years after the builder has left site.
Key takeaways
- As-built drawings show what was actually constructed, including every variation from the original design — not what was originally planned.
- They are usually a contract deliverable, produced and handed over at or around practical completion as part of project close-out.
- As-builts differ from shop drawings — shop drawings are produced before fabrication to plan how something will be made; as-builts are produced after completion to record what was actually built.
- Accurate as-built drawings are essential for future maintenance, renovations and locating buried or concealed services.
What are as-built drawings?
As-built drawings are a marked-up version of the project’s design and construction drawings, updated to reflect exactly what was built rather than what was originally specified. Every approved variation, site substitution, relocated service or dimensional change made during construction is captured on the final drawing set.
They exist because no project is built with zero deviation from the original design — services get rerouted around unexpected obstructions, materials get substituted, dimensions shift slightly on site. Without as-builts, that gap between “designed” and “actually built” is undocumented and effectively invisible to anyone who did not work on the original job.
In plain terms
As-built drawings are the “what actually happened” version of the plans — the record that matches the building, not the version drawn before a single wall went up.
As-built drawings vs shop drawings vs design drawings
As-builts, shop drawings and design drawings all describe the same building at different points in time. Design drawings come first and describe intent, shop drawings come next and describe fabrication method, and as-builts come last and describe outcome.
Where shop drawings are forward-looking — this is how we plan to make and install this element — as-built drawings are backward-looking: this is what actually ended up on site, variations and substitutions included.
| Design drawings | Shop drawings | As-built drawings | |
|---|---|---|---|
| Prepared by | Architect / engineer | Contractor / fabricator / supplier | Contractor, updated at completion |
| Describes | Design intent | Planned fabrication method | What was actually constructed |
| Captures variations? | No | No | Yes — this is the whole point |
Why as-built drawings are a contract deliverable
Most construction contracts explicitly require as-built drawings as part of practical completion or close-out documentation, alongside items like warranties and certificates. They are frequently a condition of final payment, not an optional nicety.
- Often listed explicitly in the contract as a close-out or handover requirement.
- Frequently tied to release of final retention or the final completion certificate.
- Usually the contractor’s responsibility, compiled from markups, variation records and site notes gathered throughout the job.
- Increasingly delivered digitally — marked-up PDF or CAD drawings — rather than only as paper records.
How My Trade Hub supports accurate project records
My Trade Hub keeps the original plans, priced Bill of Quantities and variation history for a job linked together from tender through to close-out, so the trail of what changed during construction is easier to track back to when and why it happened, rather than scattered across separate emails and site diaries.
Having that documented variation history in one place makes compiling accurate as-built records at project completion a far more straightforward exercise than reconstructing changes from memory at the eleventh hour.
Frequently asked questions
What is the difference between as-built drawings and shop drawings?
Shop drawings are produced before fabrication to show how an element is planned to be made and installed. As-built drawings are produced at project completion to record what was actually constructed, including any variations from the original design.
Are as-built drawings a legal requirement?
They are not a general legal requirement across all construction, but they are very commonly a contractual requirement — specified in the building contract as part of practical completion or close-out documentation, and sometimes tied to release of final retention.
Who is responsible for preparing as-built drawings?
The contractor is usually responsible for compiling as-built drawings, typically drawing on markups and variation records gathered from the site team and subcontractors throughout the job, then consolidating them into a final drawing set at close-out.
Why do as-built drawings matter for future renovations?
They are the only reliable record of what is actually behind finishes and under slabs — concealed services, structural changes and material substitutions. Without accurate as-builts, future renovation or maintenance work has to rely on guesswork or exploratory demolition.
What is the difference between as-built drawings and design drawings?
Design drawings describe the original design intent before construction starts. As-built drawings are those same drawings updated after completion to show what was actually built, including every approved variation and site change along the way.
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