As-Built Drawings
As-built drawings are amended construction drawings that capture the difference between what was actually built compared to the original design. During construction, modifications such as materials changes, dimension changes, and pipeline pathway changes can occur due to miscommunication, resource priorities, unforeseen site elements, and many more. These changes need to be documented in the as-built drawing for a successful project completion.
The architecture or main builder are usually the main parties responsible to create as-building drawings as they are responsible for the final documentation and are most familiar with the original design. However, the architect or main builder usually also uses redline drawings created by the contractors and trades on site as a basis for making the as-built drawing. Redline drawings usually refer to original plans that are marked out by contractors with red linings to indicate changes on-site. Redline drawings in essence function similarly to as-built drawing, but it is more specific to certain trade and not compiled with other trade changes.
Benefits of As-Built Drawing
Clear as-built drawings are useful in
- Assisting the main builder to communicate to stakeholders on on-site changes.
- Assisting building surveyors in approving occupancy permits for the building.
- Assisting client to maintain building performance by showing where services inspections are possible.
- Assisting the process of future demolition, renovation, and upgrade by showing where services, structures, and other important elements are located.
On top of the benefits above, in most scenarios, an as-built drawing will be required by the building surveyor for them to be able to issue occupancy permits or a certificate of final inspection. So while it does take some resources to produce it, an as-built drawing is an essential part of the successful construction project completion