BlenderBIM Add-on/BlenderBIM Costing

Please remove this "BlenderBIM_Addon_Documentation" template.

W.I.P. Demonstrations

Live Session 1 15/05/2021

Main Topics

1. How to convert IFC2x3 to IFC4
2. Discovering the Scheduling Tools
3. Discovering the Costing Tools
4. Discovering the Quantity Take Off Tools

Project Setup and Costing Tools

Project setup

• Option 1: Native authoring of IFC in Bonsai

Create New Project

1. You can find the command in Blender-Bonsai under File --> New IFC Project and Choose which unit, template, or from the wizard panel
2. Make sure to use IFC4 or IFC4x3, otherwise convert your IFC2x3 file to IFC4 or IFC4x3

• Option 2: Open an existing .ifc file

Open an Existing IFC Project

1. Go to File --> Open IFC Project
2. Navigate to your .ifc file and click Load Project or

1. Open Recent IFC Project from the drop-down menu

Creating a Cost Schedule

Entity Definition of IfcCostSchedule
An IfcCostSchedule brings together instances of IfcCostItem either for the purpose of identifying purely cost information as in an estimate for constructions costs or for including cost information within another presentation form such as a work order.

Cost Schedules can be added under the Blender Scene Properties > Cost and Scheduling > Cost Panel.

Clicking "+ Add Cost Schedule" will add as many schedules as required.

Create a New IfcCostSchedule

Assign Name and Type, as described below in Editing attributes

Editing Cost Schedule attributes

Before populating our Cost Schedules with cost items, it is best to give further information about the Cost Schedules. This is done by editing the Cost Schedules attributes, by clicking on the "Grease Pencil"

Edit Cost Schedule Properties

A Cost Schedule has the following attributes you can edit:

• Name,
• Description,
• ObjectType,
• Identification,
• PredefinedType,
• Status (PLANNED, APPROVED,AGREED,ISSUED,STARTED),
• Submitted On,
• Update Date,

Note:

• The Cost Schedule's Predefined Type can either be chosen from the dropdown list, or set as "USERDEFINED". If the latter is set as "USERDEFINED", then the attribute Object Type should denote the particular type that further defines the object.
• If "SCHEDULEOFRATES" is selected its format does not use quantities, more on this in the dedicated paragraph
  

Creating Cost Items

Entity Definition of IfcCostItem
An IfcCostItem describes a cost or financial value together with descriptive information that describes its context in a form that enables it to be used within a cost schedule. An IfcCostItem can be used to represent the cost of goods and services, the execution of works by a process, lifecycle cost and more.

Click on the Folder Tree to Enable Editing Cost Items

Open a Cost Schedule for Editing

To add a Cost Item click on "+ Add Summary Cost"

Add Summary Cost

Refering to the figure below, and the attached template, a basic cost item structure would look like this:

Cost Item entities

Attributes editable directly from the panel (in the green frame) by double-clicking on them

• ID : the Identification value of the Cost Item, typically according to a Cost Breakdown Structure (CBS) or similar
• Name : the name assigned to the Cost Item or a short description of its scope

Other attributes can be edited by selecting the "Edit" icon and clicking on the "pencil" as indicated below

Cost Item Edit Menu

Items editable activating the Edit icon:

1. Cost Item parenting hierarchy
2. Sorting order
3. Quantity
4. Value
5. Edit attributes

The parent items should contain calculations of overall quantities and/or overall costs, whilst the related nested items would contain the specific quantites and costs of assigned Building Elements, Processes, or Resources.

In the image below parent Item S.01 contains the `SUM` of the child items 1.1 and 1.2 below

Cost Item Hierarchy

Cost items can be further nested like in the image below where the top item contains cost items 1.1 and 1.2, and a summary cost item 1.3 which itself contains cost items 1.3.1, and 1.3.2

Cost Items Nested Structure

Adding Cost Item Values

To add a value to a cost item, select the item, then "Edit", and click on the "disc" icon

now some options become available at the bottom of the panel

in this example select "Fixed" from the drop-down menu, enter the desired value, click on "Add Value", and close the cost item edit

The cost item has a value that is multiplied times the "quantity" to calculate its "Total Cost"

If the cost item represents a "Summary" or a parent of nested child cost items, the procedure is as follows (Select "Sum" from the drop-down menu, click on "Add Value", close the cost item edit):

Creating Cost Item Quantities

There are different ways to create a Cost Item Quantity

the first one is by manually enter it, select the Cost Item, "Edit", click on the "switch" icon

then click on the "pencil" to edit it

Once the panel below is available enter the quantity in the box (in this case it shows CountValue, if a different unit is used, like volume or area, it may not look the same), click on the tick icon to close it

Assigning Building Elements to Cost Items

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Deriving Quantities from linked Building Element Quantities

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Caclulating Cost Item Totals

1. Component Values and how to use them
2. Calculating overall cost based on nested cost items

Useful Tools

Copying Unit Costs between cost items

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Quantity Take off Tools

1. Derive Heights, Areas, Volumes
2. Derive formwork areas

Sample Files

- .ifc template for costing