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3D Models for Construction Estimating
- 2. About
- 3. Ian McGaw Vice President of Technology & Innovation ENGworks • Degree’s in Computer Science and International Business • AEC/O Consulting & Software Development for over 15 years • Started with AutoCAD R13 & Revit 9.1
- 4. For three decades ENGworks has maintained a dual focus; as engineers on MEP design, and as technologists constantly reviewing the new means which impact the AECO community. ENGworks has continuously developed new processes, tools and services for architects, engineers, and the industry at large. We’ve taken cutting edge technology, sharpened it and then applied it to everything we know about MEP engineering, to create the most comprehensive suite of services available to our industry. About ENGworks
- 5. Prologue
- 6. • Understand why it is crucial to engage the team early-on in the process. • Recognize process efficiencies to become more effective during the life-cycle of a project. • Understand what the important factors for estimating BIM efforts are. • Consider the leanest way to estimate BIM Service execution on a project. BIM + Cost Key Takeaways
- 7. BIM is becoming the single point of truth about the project. How do we prepare for the future? BIM is just a TOOL But it’s becoming a tool for EVERYBODY! BIM + Cost Why?
- 8. 5D Estimating Connects Design to Construction Data and Workflows BIM + Cost Why?
- 9. BIM + Cost Traditional Estimating Workflow
- 10. • Analogous • Bottom-up • Parametric • Expert Judgement • Three-Point estimating • Reserve analysis • Vendor Bid Analysis • Cost Estimating Software • Cost of Quality • Delphi • Empirical • Resource Costing Estimation Methods
- 11. Direct Cost: • Labor • Material • Equipment • Subcontracting Indirect Cost: • Software • Hardware • Facilities • Repairs/Maintenance • Contingency Costs • Other Indirect Costs • Wages • Training • Insurance • Bonds • General & Administrative Expenses • Benefits • Legal • Accounting • Travel expense Types of Costs Direct vs. Indirect
- 12. Automation has found its place in many industries and has improved efficiency by many folds. More and more companies are incorporating technology and custom workflows to increase the outreach and accuracy of bids. Digital Estimating can help in the following ways: • Save time, utilize historical cost data, predict costs with better accuracy. • Bid more jobs by reducing the preparation time. • Bid more accurately with the 3D model. • Track cost overruns and execute cost control. • Integrate Cost data directly into accounting software for further checks and balances. • Easy updates during design changes, change orders, RFIs, etc. • Clearer design information lead to lesser changes/RFIs. Digital vs. Manual Takeoff
- 14. Model Based Estimates Suggested Workflow
- 15. • No Building Information Model from Design Team o Import CAD to Revit, then Trace o Analyze Modeled Results with Schedules o Export Matrix of Values • Building Information Models from Design Team o Create / Import Schedules into the Revit Model o Export Matrix of Values Revit For QTO
- 16. • Automation o Dynamo • Data Analysis o Excel o Google Docs o BIM 360 Integrations Revit For Estimates
- 17. Navisworks
- 18. • Mapped Property Takeoff • Search Set Takeoff • Drag and Drop Takeoff • 2D Drawing Takeoff • Export to Excel Navisworks For QTO
- 19. • Automation o Engyn by ENGworks Dynamo for Navisworks • Data Analysis o Excel o Google Docs o BIM 360 Integrations Navisworks For Estimates
- 20. Technology
- 21. Better Communications Maximized Budget Utilization Higher Accuracy / Quality Fast-Tracked Project Delivery Transparent Assumptions Collaborative Strategies Technology Benefits
- 22. • Involves a lot of manual effort and considerations. Due to that, this method is prone to human error. • Any updates to design will lead to manual update of the adjusted costs resulting in loss of time and money. • It is preferred due to its simplicity and acceptable accuracy. • Accepts manual, Revit and Navisworks takeoff data. Technology Excel / Google Docs
- 23. • Bluebeam offers quantity takeoff features from a PDF drawing. Again, this process is time consuming and prone to human error. • Suitable for small-scale jobs where the team has minimal to none software proficiency. • Offers the Quantity Link tool which can update the takeoff quantities dynamically with excel. • Requires excel assistance for estimation. Technology Bluebeam
- 24. • ProEst can be utilized to manage bids, quotes, subcontractors, and proposals. • Ability to refer to historical cost data for improved accuracy. • Built-in digital takeoffs are claimed to be 50% faster. • Accepts model takeoff data. Technology ProEst
- 25. • Cost & Risk Estimation for any WBS and Detail • Slice & Dice Views, Analysis & Simulation • Activity, Rate & Resource Quantity Listing • Reporting, Documentation, Tender List(s), etc. • Cost Database & Lists • Project & Assembly Descriptions • 2D/3D & Non-Design Quantities & Properties • Validation & QA Estimation & Data Technology Sigma
- 26. • Saves offers the ability to modify the estimates and the cost databases specific to the project/company. • Cost databases make estimation more predictable. • Sage also provides scheduling, electronic takeoff, accounting and report creation features. • It can input 2D and 3D information for its estimates. Technology Sage Estimating
- 27. • Adds transparency to the process. • Relieves PM from its micromanagement responsibilities. • Software integrations provide surplus options to manage and track data. • Procore handles data for GCs, Estimators, PMs, Subs, VDC team, Architects, MEP Designers & Owners. Technology Procore - Budget Tool
- 28. Integrate Assemble with your workflow • Web-based platform that serves varied user workflows like scheduling, bidding, estimation, project management, document management, & model sharing. • Reduces duplication of data. • Ensures every team member has the latest project data. • Simplifies management of data. • The integration gives management control over documents, models, clash detection data, cost estimates, and bid packages. Technology Assemble
- 29. Integrate Assemble with your workflow • Sort Data • Easier to Use for Data Manipulation than Revit. • Schedules • Use Custom Parameters. • Great for Breaking Up Systems and Cost Codes. • Sync Data Back to Revit • Compare Various Model Versions Technology Assemble
- 31. Workflow Time Cost Required Skill Additional Output Drawbacks Excel High Low Accuracy of calculations N/A Excessive manual Human error, time consuming. Bluebeam High Medium Basic Software Proficiency Quantity Link PDF drawings time consuming. Revit Low High Advanced Proficiency Easy Updates estimation software integration required. Navisworks Low High Advanced Proficiency Simulation (6D) estimation software integration required. Assemble Low High Advanced Proficiency Data Sharing Cost Timberline (Sage) Low High Advanced Proficiency Integration with Navisworks, Assemble, etakeoff, Easy Updates Cost Procore Budget Tool Low High Intermediate Software Proficiency Integration with ERP System, Forecast feature Cost Cost of Workflows Comparison
- 32. 0 25 50 75 100 Excel Bluebeam Revit + Excel Navisworks + Sage Accuracy Estimating Hours Accuracy The data below compares different workflows against the accuracy of the estimates and the estimating hours taken to complete the estimation. Higher accuracy and lesser estimating hours mean more bids go out with greater accuracy.
- 34. • VDC Scope as Defined in the RFP / BxP? o Modeling o Coordination Changes Meetings o Drawings Installation Shop Spool o Pre-Fabrication BIM Service Estimation Considerations o Required Technologies Revit Fabrication Suite o BIM to Field Bluebeam BIM 360 Trimble Points o Contingency
- 35. • Per Square Footage • Per Percentage of Total Project Cost • Per WBS Breakdown • Historic Data BIM Service Estimation Pricing Options
- 36. Future Thoughts
- 37. Allowing the entire project team to visualize, understand and optimize the design and maintainability of future facilities ahead of the construction process. VR Conceptual Estimates Advanced Visualization Technologies
- 38. Dynamo integration can help perform conceptual estimates to modify the baseline design of the project. Dynamo Based Estimation Construction Technologies
- 39. Closing Remarks
- 40. Contractors looking to expand their business’ need better strategies for accurate cost estimates. Being well versed in the power of technology will help establish a leadership position in the industry. The motives should be: • Focus on productivity and efficiency within all operations • Expect to use software tools to solve most problems • Improve and adapt to newer and faster workflows • Push for transparency of information and responsibilities Changing for Growth
- 41. A younger generation, well versed in the power of technology, is moving into leadership positions within consulting engineering firms, contractors and owners. These digital natives are: • Focused on productivity and efficiency within their operations • Expect to use software tools to solve most problems • Possess a 24/7 mentality – expecting to find what they need, whenever they need it • Seek out vendors who are easy-to-do-business with, having little regard for legacy relationships or brand Changing Demographics
- 42. It’s All About the savings… • Using model data to replace manual input. Reducing input cost and increasing quality of estimates. • Providing actual visualization of area will limit design changes. • Interaction with data from model on accounting, reporting, and cost control. Begin With the End in Mind
- 43. Thank You Ian McGaw Vice President of Technology & Innovation, ENGworks Ian.McGaw@ENGworks.com
Notas del editor
- What is the why, what are they taking away…this is why you are here for this presentation
- What is the why, what are they taking away…this is why you are here for this presentation
- Analogous Estimation involves using historical data on similar projects to estimate the overall costs and risks involved. Bottom-up Estimation is most tedious method as it involves starting at the work breakdown structure, building work packages, estimating the cost and risks involved in each work package and finally adding them up for a total cost estimate. Parametric Estimation involves identifying the unit price, duration and the number of units required for an activity to calculate costs which are totaled to give the total cost. Expert Judgment estimation is the estimated cost predicted by an experienced estimator. It can have high chances of error depending on the estimator. Three-point estimation is a method of cost estimation which is the calculated average of three possible outcomes for any activity i.e. optimistic, most likely and pessimistic outcomes. Formula: (o+4m+p)/6 Reserve Analysis involves factoring in a contingency fund in the estimation based on various factors like project size, anticipated risk, available manpower, project timeline, etc. Vendor Bid Analysis involves requesting bids from vendors, collecting the bids, and picking the best options considering all the factors affecting the project. It is the project manager’s responsibility to adhere to quality, safety, budget and time constraints. Cost Estimation Software involves utilizing cost estimation software that can quickly create and update estimation spreadsheets. The cost estimation software can give an estimator a lot of flexibility to work with. Cost of Quality Estimation (mainly used in PM or Product Manufacturing) includes calculating the money spent during the projects to avoid failures and the money spent during and after the project due to failures. Delphi Estimation is a consensus based estimating technique where several group meetings are organized to arrive at a final cost estimate. During the initial rounds, all estimates from the attendees are kept anonymous and the discussion is focused on the factors and assumptions considered in the individual estimates. In the following rounds, the individual estimates would ideally narrow down to an acceptable range which is selected as the final cost estimate. Empirical Costing Methods use the costs of a similar project size, scope, etc. to predict an overall cost estimate for any project at hand. Resource Costing involves listing the required resources (equipment, material, services or labor) for a project and totaling up their costs to arrive at a total cost estimate.