Can Automated Construction Estimating Reduce Cost Calculation Errors?

Construction estimates are a multitude of calculations of materials, labor, equipment, overhead and scope of work. All errors can have an impact on the final bid and expected margins of a project. Manual data entry can also cause inconsistencies in the process of managing a lot of information by estimators. So, contractors must have a process that involves all the right data for the project, the same numbers in the calculations, and professional review. This will take care of eliminating unnecessary mistakes and ensure there is accurate cost information all throughout the estimating process.

Digital tools are a growing part of the contractor’s toolbox to tackle intricate estimating challenges. These platforms can structure quantities, pricing, labour rates, etc., and make calculations within a single workflow. Automated construction estimating can minimize repetitive calculations and manual data entry in preparing construction estimates. But it is not possible for software to confirm all assumptions in a project without independent efforts. Even after the quantities, prices and scope details are finalised, the estimator has to review the other inputs before completing an estimate or even before bidding a competitive construction project to its clients.

Why Do Cost Calculation Errors Occur in Construction Estimates?

A lot of costs must be accurately estimated for construction. Estimators: Determine quantities of materials, labor, equipment, overhead, mark-up and contingencies. There are potential errors for each of the categories.

With lots of project information, there is more risk in using manual calculations. One wrong number can impact multiple calculations that rely on that number. 

Common Sources of Estimating Errors

One error type that is still frequently caused by manual calculations is incorrect time entries. A frequent type of estimating error is incorrect time entries, which is still caused by manual calculations. Repeated arithmetic can lead to errors in totals and/or formulas.

Another risk is related to data entry. The quantity, unit, labor rate, or material price could be entered incorrectly by the estimator.

An outdated pricing can also have an impact on the accuracy of the estimate. Because of supplies’ price fluctuations, market conditions and geographical variations, material costs may vary.

Another concern is for missing scope items. An estimate might seem to be a correct estimate, but leave out vital work from a project budget. 

How Small Errors Affect Project Costs

A small quantity error can make a big difference for a large project. The effect is magnified if the same error occurs on several line items.

The incorrect labor rates also can impact the final bid. Contractors can have a tendency to lowball their estimated manpower requirements and pressure expected margins.

Work, once begun, can cause further financial issues due to scope gaps. Then it’s possible for the contractors to get a surprise or a change order conversation.

For these reasons, it is not enough to make an accuracy estimate by just arithmetic. Contractors require accurate information about projects, consistent calculations and professional review. 

How Does Automated Construction Estimating Work?

Digital estimating solutions use project data to run the project information through a structured process. Labor rates, material costs, and other project information can be inputted based on the platform used.

The system is then able to perform predefined calculations on those inputs. This process will cut down on the need to perform the same manual arithmetic work on several estimate sections.

The quality of the result is still dependent on the information that is provided. When software calculates the math correctly, but the quantities or prices are incorrect, that’s where problems can arise. 

Data Collection and Quantity Inputs

Estimators can use digital drawings as well as project specifications, quantity data and historical cost information. A handful of platforms also link up take-off data with estimation workflows.

Estimator will still need to carefully read the source information. Drawings are subject to revision, exclusion and/or interpretation.

Units should also be used consistently for the quantity of materials used. The combination of measurements can be a source of calculation problems that software programs cannot recognize automatically.

Labor information is equally a critical area that needs attention. Estimators should confirm crew size, rates, production and hours worked.

Automated Cost Calculations

The cost of materials can be estimated by multiplying the quantities by the unit material cost, as applicable for estimating platforms. They may also be able to determine the amount of labor required if production assumptions, rates and hours are known.

An equipment estimate category can be another estimate category. Equipment costs can be added for the contractor based on the need for the project and likely use.

Markup, overhead, and contingencies can also be applied to the system. The above numbers should, however, be in accordance with the actual estimating policy of the contractor. 

Can Automation Reduce Manual Calculation Errors?

Automation can help to eliminate repetitive arithmetic in big estimates. Software uses formulas that have been programmed for use to create extensions all at the same time, without having to do the calculations on each extension individually.

This can lessen some of the errors in calculations. It can also reduce the risk of entry of the same data into multiple estimating functions when information is passed from one function to another. Automation, however, does not take the place of human judgement. There is still work to be done on quantities, pricing, assumptions and project scope for the estimators. 

Reducing Repetitive Data Entry

Centralized information can decrease the amount of duplicate information entered. Estimators can structure details of a project in a uniform estimating workflow.

Reusable cost data can also help eliminate the need to re-enter data manually. Common material, labor types and equipment can be maintained as standard categories for teams.

But the standardized information must be reviewed on a regular basis. Teams can continue using old rates/inaccurate cost records, which can impact multiple estimates. 

Consistent Calculation Methods

Standard formulas can be used throughout estimate line items. This uniformity can minimize variations due to different calculation methods.

A contractor may, for instance, set the same markup policies for different types of projects that are similar. The rules can then be applied based on the configured workflow in the system.

Making estimates based on consistent calculations is easier to review. Comparing figures with known estimating procedures can be done by team members. 

How Does Automated Estimating Handle Material Costs?

Construction costs can be a major cost component in the project budget. The necessary quantities and the up-to-date unit prices are, therefore, important when preparing estimates.

Estimators can access supplier data, previous project data or their own cost data bases. There are specific requirements for the review of each source before use.

Changes in market conditions are also likely to affect the cost of materials. Contractors should take into account how often their cost information needs to be updated. 

Material Price Updates

The cost of materials may vary and be subject to fluctuations depending on supply, transportation, demand and regional conditions. A cost database should, therefore, be kept up to date.

There are some estimating platforms that enable their users to update their pricing information. Contractors can be able to keep supplier pricing and internal pricing records in their workflows.

But software can’t tell if a price is an accurate representation of a particular project. Before a final estimate, be sure to check out important pricing in detail. 

Quantity and Unit Cost Accuracy

The correct quantities are the basis for material cost calculations. The estimator needs to verify measurements and/or specs before utilizing unit prices.

It is also important to have uniformity in the units. The quantity used should correspond to the price unit used to calculate the price.

For instance, the price of materials might be in terms of square feet, linear feet, cubic yards, tonnes or pieces. The wrong conversions can cause a big difference in costs. 

Can Automated Estimating Reduce Labor Cost Errors?

When making labor calculations, a number of assumptions are made. These may include crew size, working hours, production rates, working conditions on the project and hourly rates.

Labor calculations can be programmed in the software and applied consistently. However, the estimator will need to give suitable parameters depending on the requirement of the project.

Automated construction estimating can, therefore, minimize some of the risks involved in construction labor estimates. It can’t be sure that the chosen production rate is correct for all the project conditions. 

Labor Rate Calculations

Labour costs will depend on trade, location, experience, project conditions and company policies. Contractors should keep records of labour up to date.

Different categories of labour and labour rates can be stored in a cost database. This process can simplify the estimation process and the reviewing process.

Rates should, however, be based on the given project conditions. Before finalising the numbers, estimators should make sure that key assumptions are correct. 

Production and Productivity Assumptions

Production rates are an approximation of the amount of work that a crew can perform in a specified amount of time. These assumptions may differ greatly from project to project.

Productivity can be influenced by site conditions, weather, conditions of the project, experience of the crew and working conditions.

The software for estimating software can estimate costs based on the selected production rates. The estimator will still need to decide on the reasonableness of those rates for the project. 

What Role Does Quantity Takeoff Accuracy Play?

The cost of materials and labor are directly impacted by the quantity takeoffs. This can lead to false estimates if the software carries out all calculations correctly but the takeoffs are wrong.

Not having the quantities can leave key work beyond the estimate. When quantities are duplicated, it can lead to an unnecessary cost within the bid.

Digital takeoff software can link measured quantities to estimating workflow. This connection can minimize multiple entry points between different processes. 

Identifying Quantities From Digital Plans

Digital plans can contain length, area, count and other measurable aspects of a project. The details are examined by estimators based on the scope of the project.

Revisions of plans need to be especially examined. Quantities from an earlier version can be changed in a newer drawing.

Specifications also come into play when it comes to take-off. The cost may be influenced if the quantities are not changing but there is a need for material change. 

Connecting Takeoffs With Cost Data

The estimating process can determine extended costs more reliably when quantities are linked to estimating costs.

For instance, an estimator is able to relate a measured quantity to a suitable material unit price. The system can then be used to determine the cost of the resulting system.

This relationship will minimize the number of times the same amount of data needs to be re-entered into the estimate sections. Nevertheless, the estimator has to double-check the quantity and pricing data. 

Can Automated Construction Estimating Improve Estimate Consistency?

Standard estimating procedures can make project reviews easier. Routine templates can be used to arrange costs in accordance with the company’s regular procedure.

Contractors can also establish categories for materials, labor, equipment, overhead, and markups.

The automated construction estimating can easily apply configured calculation rules to every estimate. This can help minimise variation due to repetitive manual calculation. 

Standardized Estimating Templates

Templates can set up a consistent structure for estimates. Cost categories can be set up by the contractor based on the usual needs of the project.

Material, labor, equipment, overhead, and markup sections may be included in a template.

Templates do need to be reviewed, however. There is no one universal template that would be suitable for every project, so estimators need to customize templates as needed. 

Centralized Cost Information

Having all the cost information in one place provides an estimating team with a common reference. All historical pricing, supplier data and labor rates are kept in one workflow.

However, teams should make sure to check how old the information is and how reliable it is. Older records may pose issues for several estimates.

A cost information database can remain up to date with regular maintenance. It is important for contractors to set their responsibilities regarding the updating of pricing and estimating data. 

What Errors Can Automation Still Miss?

There are some calculation errors that can be prevented with automation, but not all estimating problems. Software is driven by the information & assumptions given by users.

An error in the input can then return an error as an output. The system may calculate the wrong quantity correctly and not know that it has made a mistake.

Professional judgement can also be necessary for project conditions. New or ambiguous conditions or requirements on a construction site could require an estimator to make interpretations. 

Incorrect Project Inputs

The choice of the wrong units can have a big impact on a calculation. If the wrong measurement is input, it will result in an incorrect cost.

If the scope items are not addressed, another problem exists. Software cannot determine costs for work that was not entered by the estimator.

Material pricing may also be impacted if the specifications are not correct. The estimator needs to thoroughly examine the project documents and verify critical specs. 

Human Review and Validation

Professional review is still a key component of estimating. With experience, the experienced estimator can compare software results to drawings, specifications, and project requirements.

They can also detect abnormal amounts and cost differences. These checks offer context which cannot be achieved independently from automated calculations.

Validation should be done prior to giving out tenders to contractors. Numbers, prices, labor, equipment, overhead, assumptions and exclusions should all be topics of the review. 

How Should Contractors Verify Automated Estimates?

Contractors need to have a review system in place before committing to an automated estimate. The calculations and scope of the project should be included.

Estimators may use drawings and specifications for quantities to compare quantities. They can then check unit prices and labour assumptions.

Also overhead, contingency, markup, and expected profit margins should be taken into account in the final review. 

Reviewing Quantities and Pricing

Important takeoff quantities should be checked against project documentation by estimators. They should also check that unit prices are comparable to the appropriate materials.

For larger and/or special order items, supplier pricing may need to be confirmed. Deliveries or regional differences should be taken in account by the contractor.

The same should be done for labor rates. The estimator needs to establish that the rates are consistent with the project location and the amount of labour to be used.

Reviewing Scope and Assumptions

The scope review process can help uncover missing work before submission of bids. Estimators should take the time to compare estimate line items to project specifications and contract documents.

It is important to pay attention to the exclusions also. Exclusions that are clear will help avoid confusion in subsequent discussions of the project.

Allowances and contingencies should be in keeping with project conditions. Important assumptions should be recorded as part of the documentation of your estimate for the contractor’s review. 

What Should Contractors Consider Before Adopting Automated Estimating?

Depending on the type of projects and current workflow, contractors need to analyze software. What works for one company will not necessarily work for another.

Integration also matters. Estimating platforms might require integration with accounting systems, project management, takeoff or other business applications.

Data quality is still a priority. Accurate cost data is essential for a sophisticated platform and producing accurate estimates. 

Software and Workflow Compatibility

Contractors need to consider software in the context of the existing estimating process. There are several factors that teams need to keep in mind when setting up a project, including takeoffs, cost databases, reporting and bid preparation.

Can cut down on duplicate data entry with integration with accounting systems. Other links with project management systems can also help to ensure the continuity of information.

Contractors should draw a diagram of their current process before adopting. They are then able to pinpoint where the software can be placed and where process changes may be needed to accommodate the software. 

Data Quality and User Training

Cost databases should include valid and pertinent data. There needs to be procedures in place for contractors to regularly check and refresh saved rates.

It’s also important to train users. Estimators must have an understanding of software functions, data requirements and quality control procedures.

There should be training on how to operate the system and on internal estimates standards. This method will provide uniformity in the estimating process among estimating teams. 

Conclusion

The variations in cost calculation may be due to arithmetic mistakes, quantity problems, incorrect prices and lack of scope data. Repetitive calculations can be avoided or streamlined, and estimating workflow can be more consistent with automation. But correct inputs are still crucial for correct outputs. Assumptions, material costs, quantities, labor rates and project requirements should be checked by the professional estimator. Automated construction estimating is best suited in a systematic process that involves accurate and sound data, uniform calculations, expert judgement, and a detailed review prior to a contractor signing on to a project price. 

FAQs

Can Estimating Errors Be Avoided Using Automated Construction Estimating?

No. Automation will not eliminate calculation or data entry mistakes, but if the data entered is wrong, then the results of the automation will be wrong. A profile review is still required.

Is automated estimating better than manual estimating?

The accuracy will be based on the quality of the data, software configuration, project complexity and estimator review. Automation can help to ensure uniformity with repetitive calculations.

Which construction costs can be automated and calculated by the automated estimating?

The estimates can vary based on the platform and may contain cost categories specific to a project, as well as materials, labor, equipment, overhead, and markups.

Should the estimates, made by the computer, be checked by the estimator?

Yes. When submitting a bid for experienced estimators, it is important that quantities, pricing, assumptions, scope and final calculations be checked.