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Douglas Krantz - Technical Writer - Describing How It Works
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What is an As-Built Plan?

Because a building sometimes can't quite be built exactly the way it was designed, As-Built plans show the exact way the building is constructed.

As builts are more than just blueprints of what should be done, they show how it was actually done.
As builts should be drawn as the building is constructed, but they really are intended to show how the building was actually put together vs how it was supposed to be put together.


By Douglas Krantz

The owner of the building project is the beginning of the planning process and the end of the planning process.

The Conception Plans

Before a shovel is put into the ground to dig the foundations, the building is planned.

The owner either has an architect in mind, or has several architects bidding on a general idea of the design. If there are multiple architects, each one conceives of a design.

This conception includes the overall design and shows a general cost of construction for that design. These plans are the original conception plans of the building.

Bid Plans

Working with the architect, the engineer creates plans showing details of construction that make the building work.

The engineer specifies the overall structure, the materials that make up the walls, floors, ceilings, the location of electrical outlets, ventilation systems, communication systems, fire alarm systems, etc. Once the engineer is finished, the plans are ready for construction bidding.

Rather than being the final or finished blueprints, the plans become the basis for the contractor and sub-contractors to submit their bids.

These plans are the Bid Plans of the project.

Submittal Plans

The bid plans show how the completed building will look, but the plans don't show how the contractor constructs the building. Unless the make or model of equipment is specified by the engineer, the plans don't even show exactly what equipment will be used.

To show what is going to be done to make it work, the contractor and sub-contractors make changes to the bid plans, then submit the changed plans, along with the cost of construction, back to the engineers.

These plans are the Submittal Plans for the project.

As-Built Plans

Once the contractor's bid is accepted by the architect and owner, construction can begin.

The owner will want blueprints showing how the building is constructed. The problem is what was planned never is exactly what was done. In other words, even the submittal plans don't really show what was done.

For the contractor or sub-contractor to make it work:
The architect and engineer can't visualize every detail, and once construction is started, often the owner makes changes. To show the details of how a building is constructed, it's up to the contractor and sub-contractors to correct the plans showing what was actually done.

The person on site in charge of construction or installing the system makes corrections to the submittal drawing to create the As-Built drawings.

This is the basis for the final drawings As it was finally constructed or Built, showing:

Plan Conception vs As-Built Completion


For each building project, the planning and construction process is different, but this outline shows a general idea.
Based on his electronics training, and his understanding of Life Safety, Douglas Krantz has compiled his knowledge of Conventional Fire Alarm Systems into the book Make It Work - Conventional Fire Alarms. The book covers the basics of the Conventional Fire Alarm System, and shows how Life Safety and internal supervision affects the fire alarm system.

Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer

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