Creating Accurate Square Foot Estimates | Gordian (2024)

For any construction project, several estimates can be prepared during planning to ensure stakeholders have a clear understanding of the projected scope, cost and timeline. In general, initial estimates are intended to be created quickly and economically. As planning proceeds and the project nears kickoff, there comes a need for more accurate and more time intensive estimate types.

In a previous post, we discussed how conceptual estimates are typically prepared at the beginning of the planning phase to make crucial decisions quickly. These help project owners make high-level decisions, but conceptual estimates have an inherent limitation – the accuracy of the predicted cost. When the basics of a project are set and owners need a better idea of what their projects might cost, including how some details might affect the cost, preparing a square foot estimate will help.

What is a Square Foot Estimate?

In simple terms, square foot estimates use an historical cost per unit, which is one square foot, and multiply that cost by the total number of square feet a building is expected to be. This may sound just like a conceptual estimate, but there is more that goes into creating a square foot estimate. It also considers many details of the building – materials, fixtures, and finishes – that can influence the total cost, sometimes by a large margin. When changes are made, project owners can easily see how they affect the overall cost per square foot and how these cost changes scale with the project.

Read more about how different estimate types are used at various stages of project planning.

How Square Foot Estimates Better Inform Project Owners

We’ve established that a square foot estimate considers project details. But how does this help project owners?

When a Chambers, Arizona developer looked to one of Gordian’s engineers to help create a square foot estimate for a new apartment building, the engineer was able to quickly build an estimate of what the building might cost using RSMeans Data Online. The process of creating the initial estimate was as simple as selecting one of RSMO’s many pre-built square foot models and selecting the location and rough square footage. From there, he input details of the project, like how many apartments the building would include and how many bathrooms, kitchens and bedrooms would be in each apartment. This information alone was enough to present a general project cost to the project’s stakeholders. But what happens when stakeholders want to make modifications?

The flexibility of using RSMeans Data Online when creating a square foot estimate was evident when the stakeholders asked the engineer how much adding an additional elevator would impact cost. The engineer was able to edit the estimate within the platform by simply increasing the number of elevator assemblies. RSMeans Data Online took care of all of the details, accounting for the entire elevator assembly and all associated costs of adding more elevators. From there, the engineer could quickly present the cost impact of the changes. With this information, the project’s decision makers were able to better assess whether or not installing additional elevators would be worth the additional cost.

See how RSMeans data can help you quickly and reliably estimate the costs of your projects with accurate, location-specific data.

Creating Estimates Backed by Trusted Data

The power of a square foot estimate, backed by powerful software, is in its flexibility. Estimators can change project details with as much granularity as the project calls for. With RSMeans Data Online, estimators can instantly see the impact that these changes make.

For any construction project, having more information sooner leads to better outcomes. And when decision makers need to see how different decisions might affect their bottom line, having accurate, localized cost data can give them the confidence to make hat call. That’s where RSMeans Data Online can help. With the power to access over 40 square foot models and accurate costs for more than 970 locations, estimators, engineers and other RSMeans Data Online users can make fast changes to square foot estimates and provide clients with options that maximize their budgets, exceed their functional expectations or both. For creating square foot estimates, where accuracy and flexibility are key, a powerful online platform like RSMeans Data Online enhances productivity.

Creating Accurate Square Foot Estimates | Gordian (1)

Creating Accurate Square Foot Estimates | Gordian (2024)

FAQs

Why are detailed estimates more accurate than square footage estimates? ›

Because this type breaks down cost data into more minute details than a square foot estimate would, it gives a more accurate total cost.

How do you accurately estimate construction costs? ›

Construction Cost Estimating: A Step-By-Step Guide
  1. Review bid package.
  2. Conduct a site visit.
  3. Perform a material takeoff.
  4. Solicit pricing from suppliers and vendors.
  5. Evaluate labor requirements.
  6. Determine insurance and bonding costs.
  7. Calculate overhead and indirect costs.
  8. Account for profit and contingency.

Which type of estimate is the most accurate? ›

Definitive estimate:

Typically, bottom-up estimates are placed in this category – the most accurate estimate is a definitive estimate, since the way to create one is to estimate the individual costs for the different parts of the project and then put them together into one estimate.

How do I make my estimate more accurate? ›

Six Tips for Making Project Estimates More Accurate
  1. Designate a Lead Estimator. ...
  2. Encourage Bottom-Up Estimating. ...
  3. Gather Detailed Requirements. ...
  4. Determine Pessimistic, Best Guess, and Optimistic Estimates. ...
  5. Encourage Communication Among Project Members. ...
  6. Include Finance and Legal Staff. ...
  7. Takeaway.

What is the most accurate estimation method? ›

Detailed estimate is the most accurate method and consist of working out the quantities of each of item of works and working the cost. The dimensions are taken directly from the drawings and quantities of each item are calculated.

What are the 4 steps to accurate estimation? ›

In the process of estimating, there are four things a project manager must consider:
  • Project scope.
  • Timeframe.
  • People.
  • Budget.
Apr 1, 2024

What is the most reliable estimate? ›

Answer: Detailed estimate is the most reliable estimation. A imprecise calculation of the value, number, quantity, or extent of something is defined as an estimate. When a solution is acceptable and is also very close to the true answer, estimates of numbers are employed to make mental calculations easier and faster.

What is the most reliable estimate in construction? ›

The elemental cost estimate or elemental cost plan is a more accurate method and analysis of construction costs as it is based on further detailed drawings and specifications.

What is the formula for calculating construction cost? ›

What is the formula to calculate construction cost? To calculate the construction cost, you simply need to multiple your area value by the construction rate per square feet or square metre. The construction rate depends on various factors such as the plot's location, potential cost of labour and raw materials, etc.

How accurate does an estimate have to be? ›

An estimate can be verbal or in writing — there's no legal difference between a written or verbal estimate. It's a best guess. The actual price may be more or less, but it is commonly expected that it should be within 10 to 15 percent of the final cost. For bigger jobs, it is a good starting point while you plan.

Which method of estimating will provide the most accurate estimate? ›

Bottom-up estimating is also called analytical estimating. It is the most time-consuming technique, but it is also the most accurate. It's a complete work breakdown that divides project deliverables into a series of work packages in which the project team will estimate the cost of completing each task.

What is the most reliable form of estimating? ›

Bottom-Up Estimate

In fact, bottom-up estimates are the most accurate type of cost estimate. This method also takes lots of time to prepare and should only be used if there's sufficient information and time to do so. For example, LinkedIn looks at doing a bottom-up estimate for a web design project.

How accurate is detailed estimate? ›

How Accurate is a Detailed Estimate? It can be very accurate depending on how thorough a job is done in the planning phase. The final costs can be within a very acceptable margin of error of 0%-15%.

Which estimating technique typically provides the most accurate results? ›

The “bottom-up” estimate used to take the longest amount of time to prepare, but provided that sufficient component detail is taken into account, this project estimation technique can provide the highest level of accuracy and can be automated with artificial intelligence.

What is the difference between a detailed estimate and a square foot estimate? ›

What is the difference between a detailed estimate and a square-foot estimate? A detailed estimate requires complete drawings and documents and considers all quantity and cost aspects needed in order to complete the project, while a Sq. Ft. Estimate considers the cost of the building in terms of cost per sq.

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