Revit API is a mechanism that allows you to flexibly extend the functions built into Revit, developed by Autodesk. By using programming languages such as the following, you can add functions that are not supported by standard Revit.
Revit API helps solve common problems that arise when using Revit, such as “I wish there were a function for this” or “This task takes too much time.” In particular, Revit API can significantly reduce repetitive manual tasks, helping improve work efficiency. If you are not fully satisfied with your current Revit workflow, consider exploring and applying Revit API.
In addition, if you want to start learning the basic operations in Revit, check out this article for more information before getting started.
Here are some typical examples of what Revit API can do:
| Function | Examples |
|---|---|
| Task Automation | ・Batch drawing export (export multiple files to PDF at once) ・Automated quantity takeoff (generate quantity schedules) |
| Custom Functionality | ・Add drawing-checking functions based on custom rules ・Create easy-to-use shortcut buttons （grouping only the functions frequently used in daily work） |
| Integration with External Tools | ・Connect with Excel or databases ・Connect with cloud platforms to share information |
| AI Integration | ・Combine with Generative AI to develop new APIs ・Connect with Model Context Protocol to automate API generation |
With Revit's standard features, users may sometimes only be able to create structures and perform quantity takeoffs. With Revit API, however, you can integrate custom tools directly into Revit to check whether a design complies with building standards and regulations, such as building codes.
If you want to complete your work directly within Revit without having to switch between multiple separate applications, Revit API is a solution worth considering.
Revit API is a convenient mechanism for extending Revit with additional functionality. However, implementing it also comes with certain challenges. Here are some of the main advantages and disadvantages of using Revit API:
| Advantages | Disadvantages |
|---|---|
| ・Automates tasks, allowing users to focus more on core design work ・Reduces human errors through automated checking functions ・Centralizes data management by connecting with external tools ・Builds a “custom Revit” with functionality tailored to the company’s needs | ・Programming knowledge is required for development ・Existing add-ins need to be managed and updated for each Revit version ・Learning and developing add-ins takes time ・If development depends on a single individual, it can lead to dependency on that person |
Revit API provides many benefits, but it also has a relatively steep learning curve, so these challenges should be considered when implementing it.
In addition, if a company has employees with strong programming skills, development should not be assigned entirely to one person. Instead, the rules, knowledge, and system-building information should be shared across the team. Revit API development can easily lead to individual dependency, so it is important to establish an environment where the company can continue to use and maintain the system even if the person responsible for development leaves the organization.
Many people believe that Revit API is difficult without programming experience. However, even beginners have several ways to get started with and use Revit API.
Below are three approaches, ranging from the simplest and easiest method to options for users with basic programming knowledge:
If you are a beginner and want to use Revit API in a simple way, you can install add-ins available on Autodesk’s official website. The official App Store offers a wide range of add-ins developed by developers around the world, covering areas such as:
For basic additional functionality, you often do not need to develop an add-in from scratch. Instead, you can simply install a suitable add-in.
However, if a foreign-language interface makes the add-in difficult to use or the add-in you need is paid software, you may want to consider developing your own solution, as described below.
If your company has employees with programming skills, you can use languages such as C# or Python to develop Revit API solutions. Even if your company does not have dedicated API developers, you can consider the following options:
Add-ins available on the App Store provide pre-developed functionality. By developing your own API, however, you have greater freedom to customize and add functionality.
You can integrate company-specific workflows into the API and combine multiple functions so that they run automatically in sequence, helping improve work efficiency. Therefore, if you want to build a Revit API solution specifically tailored to your company, custom development may be worth considering.
With recent advances in AI, another approach is to use Generative AI tools such as:
For example, as shown in the image above, you can ask AI to create a function that checks elements and highlights in red those whose dimensions contain values below three decimal places. The AI can then generate code such as:
from Autodesk.Revit.DB import *
from Autodesk.Revit.UI import *
from Autodesk.Revit.UI.Selection import *
from Autodesk.Revit.ApplicationServices import *
from Autodesk.Revit.Exceptions import *
import clr
import math
# Get the active Revit document
doc = __revit__.ActiveUIDocument.Document
～ part of the code omitted ～
except Exception as e:
print("Error with element: {}".format(e))
t.Commit()
TaskDialog.Show(
"Check Complete",
"{} dimensions have been highlighted in red".format(count_flagged)
)In this way, Generative AI can generate relatively sophisticated Revit API code based on the requirements provided by the user.
However, code accuracy can vary depending on the requirements and the Revit version being used. Therefore, after AI generates the code, you should still test and verify that it works correctly in the actual Revit environment before using it in production.
Revit API opens up many possibilities for extending Revit, from task automation, model checking, and data integration to building tools tailored to a company’s specific workflows. However, to make effective use of Revit API, users need a solid understanding of Revit, programming knowledge, and an appropriate development process.
For companies looking to automate Revit workflows but without an in-house team with specialized development expertise, working with an experienced provider in BIM/CAD and Revit API development can help shorten implementation time and create solutions that closely match real-world requirements.
BIMCAD Vietnam develops BIM/CAD solutions, Revit API, and custom software, helping businesses automate repetitive tasks and optimize project workflows.
