You’ve spent days crafting the perfect budget. Your teams have accurately bid on everything, the subcontractors have given the right numbers for installations, and material pricing is transparent, yet your estimated 12% profit margin has actually fallen to 4%. Why is that? Most people immediately assume that the budgeting went wrong somewhere. But the truth is that it is rarely the direct cost. This deviation occurs because of construction preliminaries.
In most projects, estimators spend a significant amount of time configuring the direct costs, and end up using a rough estimate for construction preliminaries, which ruins their profit margin. To counter this, we discuss the best way to approach prelims and how to use them to your advantage. Continue reading to explore more!
Key Takeaways
- Construction preliminaries fall between 8 to 15% of the total project budget but vary significantly depending on the project type and duration.
- Bottom-up estimation based on actual requirements beats generic percentages every time.
- Site-specific factors, like access, location and constraints significantly impact preliminary needs.
- Once you start tracking actual costs, you’ll also have the data foundation for improving future estimates.
- Configuring the items based on time, in alignment with the schedule duration, will protect your margin.
What Are Construction Preliminaries?
Before we dive into how construction preliminaries affect the budget, let’s understand what it actually means. Also called “general conditions” or “general requirements” in the United States, construction prelims are the indirect costs of facilitating and managing a construction work-site. They are the particulars in the list that don’t even show up in the finished project, but without them, it would be impossible to build anything at all. For instance, items like temporary facilities, project management, safety equipment, temporary utilities, site fencing, access, and the dozens of others that support your subcontractors and keep the project compliant.
The significant difference between direct costs and construction prelims is that the latter exists only for the duration of the project, unlike labor costs, materials, equipment, main office rent, back-office salaries, etc. Typically, project managers or contractors allocate 8 to 15% of the total budget to construction preliminaries but this estimate rarely works. There are multiple factors that can drastically affect the numbers.
For example, consider this situation. You have to overlook a $2M office renovation over the course of 6 months. Some of the expected preliminaries may include:
- Project manager (25% time allocation x 6 months = $30K)
- Full-time superintendent ($75K)
- Job trailer rental ($1,200 per month x 6 = $7,200)
- Temporary power ($800 per month x 6 = $4,800)
- Waste management
- Safety equipment
- Testing
This entire list totals around $250K to $300K, which is 12 to 15% of the contract value. Thus, the actual numbers need to be considered rather than rough estimates.
In the following table, we look at the core components and what’s actually included in preliminaries:
| Categories of Construction Preliminaries | Examples |
| Site Establishment & Temporary Facilities | – Job trailers, storage containers, and break areas – Temporary facilities (portable restrooms, hand washing stations) – Site fencing, barricades, and gates Signage (project boards, wayfinding, branding) |
| Management and Supervision | – Project manager and superintendent time allocation – Project engineer and scheduling support – Document control and coordination – Progress meetings and reporting |
| Temporary Services and Utilities | – Temporary power supply and distribution- Water connections and metering – Temporary heating and cooling – Internet, Wi-Fi, and communication systems |
| Safety & Compliance | – Safety manager/officer time- PPE supply and management – Safety barriers, fall protection, and guardrails – Toolbox talks and OSHA compliance – Insurance and payment/performance bonds |
| Equipment & Machinery | – Tower cranes and material hoists- Scaffolding and aerial lifts- Temporary shoring and formwork design – Small tools and consumables |
| Site Operations | – Waste management (dumpsters, recycling, removal) – Housekeeping services (daily and final cleaning) – Traffic control and pedestrian protection – Security (personnel, cameras, alarm systems) |
| Testing & Commissioning | – Material testing and special inspections – Quality control procedures – Building commissioning and TAB services – Record drawings and O&M manuals |
| Logistics & Coordination | – Material handling and distribution – Delivery scheduling and coordination – Off-site storage and staging (if required) – Parking coordination and haul routes |
What Mistakes Kill Your Preliminaries’ Budget?
In order to understand how construction preliminaries factor into the overall construction budget, let’s look at some of the common mistakes contractors and site managers make.
#1 Mistake: Using Blanket Percentages
Risk: 20 to 40% budget variance
When the total budget of different projects keeps changing, it barely makes sense to apply a blanket percentage on all of them. Most contractors tend to use a standard of 10 to 12% across all projects. But consider this – you have a $1M, 6-month office build-out that needs around $120K prelims, translating to 12% of the budget; and you have a $1M, 3-month fast-track equipment installation that needs $60K, translating to 6% of the budget. When the difference is so clear, it becomes evident that a standard number will not suffice.
#2 Mistake: Forgetting Project-Specific Requirements
Risk: $15K to $50K in unforeseen costs.
Templates and spreadsheets typically have permanent requirements that you need for all projects. But it is important to keep in mind that prelims are inherently items you’ll need temporarily. Thus, forgetting project-specific requirements will add on to unforeseen costs. For instance, a jobsite beside an occupied building will require extra protection, noise monitoring, and restricted working hours.
#3 Mistake: Underestimating Duration
Risk: Direct cost increase of 15-30%.
Several times, unforeseen circumstances have delayed construction projects. In such cases, time-based prelims will increase by the same proportion. For example, job trailers, supervision costs, and other utilities continue to run and cost money.
#4 Mistake: Ignoring Seasonal and Regional Factors
Risk: $10K-$40K in unbudgeted environmental controls.
Different regions have varying needs. Winter projects in the Northeast will need temporary enclosure, heating, and snow removal. Similarly, projects in the Southwest will need dust control and excess water for heat mitigation. Thus, when planning your budget, factor in seasonal and regional requirements for your construction prelims.
#5 Mistake: Poor Cost Tracking During Construction
Risk: Inability to identify and correct 20 to 30% cost overruns
If you’re unable to understand and analyse where the budget money is actually going, the prelims are bound to overrun, and you’ll be forced to estimate which items are costing the most. Thus, avoid lumping all construction preliminaries under one cost category, and bifurcate as much as possible.
How To Get Construction Preliminaries Right? Explore The Best Practices
Now that we’ve looked at the common mistakes, let’s understand some of the best practices for figuring out construction preliminaries. Consider these and analyse how quickly your budgeting transforms!
#1 Start from Scratch
As discussed above, most contractors and project managers tend to slap a randomly estimated percentage in front of prelims. Instead of this, start from square one and figure out the actual project requirements. Consider this table for further examples:
| Particulars | Basics | Example: Bottom-Up Calculation for 6-month Commercial TI ($1M Project) |
| Time-based items | – Calculate weekly rates × anticipated schedule duration – Add mobilization and demobilization costs – Include a realistic contingency (5-10%) | – Superintendent: 26 weeks × $2,500/week = $65,000 – Project Manager (30% allocation): 26 weeks × $900/week = $23,400 – Temporary utilities (power, water, internet): 6 months × $1,200/month = $7,200 – Job trailer & facilities: 6 months × $1,800/month = $10,800 |
| Fixed items | – Price based on actual quantities needed – Get quotes from suppliers for major items – Consider procurement timing and market conditions | – Mobilization/demobilization: $8,500 – Permits & bonds: $12,000 – Safety equipment & barriers: $6,500 – Signage & site protection: $3,200 |
Subtotal: $136,600
Contingency (8%): $10,928
Total Preliminaries: $147,528 (14.8% of contract value)
Thus, via this bottom-up approach, you’ll be able to reveal the actual cost structure instead of applying a generic 5 to 10% estimate, which would have left you short of money.
#2 Conduct Thorough Site Analysis
Before you start working on the prelims’ costs, you must take some time out in understanding the fundamentals of your job site. For instance, here are some pointers you can consider:
- Access constraints
- Delivery logistics
- Existing utilities
- Service locations
- Adjacent property
- Tenant considerations
- Local jurisdiction requirements
- Permit conditions
- Soil conditions affecting temporary works
#3 Differentiate by Project Phase
Another great way to tackle construction preliminaries is to break them into smaller pieces. You start with a smaller chunk and move your way up. For instance, you can start with mobilization first, like initial setup and working on the intensity. Then, consider the actual construction work to figure out the steady-state running costs. Next, focus on closeout to reduce management and elevate testing. Lastly, analyse which prelims’ costs will come into the picture for demobilization, that is, removal and site restoration.
#4 Track and Learn
Finding out the construction preliminaries for merely one project isn’t enough. You need to maintain detailed records of these across all projects. Only when you have a strong database of weekly running costs by project type, fixed costs for common items, regional variations, supplier rates, and lessons learned from overruns, will you find that historical data has become an invaluable tool for future estimates. This will also help your trend analysis and pattern recognition.
#5 Collaborate Early
Contractors, sub-contractors, job owners, and traders who actually work in the field often find practical requirements that project managers or superintendents will miss. Thus, actively engage them during the bidding stage. A few minutes’ worth of conversation in the beginning can actually save thousands of dollars later.
The Future of Construction Preliminaries
As the field of construction moves towards a more digitalised way of project management and handling tasks, tracking and managing construction preliminaries is also evolving. Here are a few pointers that you might want to consider to fast-track your project.
- Digital project management: Most construction management platforms are now cloud-based. Because of this, real-time monitoring of temporary facility usage, utility consumption and equipment deployment is possible. This adds on to the visibility of the project.
- Sustainability requirements: An increasing number of companies are turning towards sustainability practices, like carbon tracking, waste diversion and reporting, EV charging infrastructure, and renewable temporary power solutions. These are gradually becoming standard requirements for construction prelims.
- Modular and prefabricated solutions: Even though construction preliminaries are temporary, modern sites are deploying reusable systems and solutions so they can be relocated between projects. This makes preliminary costs a capital investment and also reduces the per-project expenses.
- Regulatory evolution: As safety measures around construction sites become more prevalent, the budget for construction prelims also grows. Stricter environmental, safety and quality standards are given increasing importance now, especially in urban and environmentally-sensitive locations.
- Data-driven estimation: As we move towards digitisation, machine learning and AI tools are being incorporated in the workflow to analyze historical project data and generate more accurate preliminary estimates. This will help teams reduce the reliance on rule-of-thumb percentages.
Final Thoughts
Construction preliminaries rarely come into focus. They’re not the kind of budget items that appear in project completion photos or reviews, because of which superintendents and owners rarely acknowledge them. But it is this accurate preliminary estimation and management that makes projects successful. It is equally important for general contractors and project managers to understand that preliminaries aren’t rough estimates but actual requirements your construction crew and project have. Thus, it is crucial that you price and manage these costs accurately.
Stop Leaving Money On The Table! Choose Track3D
With the help of modern construction management platforms like Track3D, contractors can track the costs of construction preliminaries in real-time, benchmark against historical project data and transform prelims management from budget risk into competitive advantage. In fact, contractors who have used our data-driven preliminaries’ tracking system have reported 25 to 40% improvement in accuracy of estimating prelims.
Thus, to see how Track3D transforms preliminary cost management, Schedule a demo today!
Frequently Asked Questions
What percentage of project budget should go to preliminaries?
Most contractors allocate 8 to 15% of total project value to preliminaries, but this range varies significantly based on project type, duration, and site complexity. A bottom-up estimate based on actual project requirements will always be more accurate than a percentage applied at bid review.
What Is The Difference Between Preliminaries and General Overhead
Preliminaries are project-specific costs that exist solely for the duration of a particular job site supervision, temporary facilities, utilities, and safety. General overhead covers company-wide expenses such as main office rent and back-office salaries that would exist regardless of any individual project.
Why do preliminary costs cause so many project overruns?
Because most time-based prelim items scale directly with schedule duration. When a project runs longer than planned, every weekly cost of supervision, facilities, utilities, and equipment rental increases automatically. Poor initial estimation and inadequate tracking during construction compound the problem.
What are the biggest overrun risks within preliminaries?
Supervision costs, temporary utilities, and equipment rental are the highest-risk time-based items because they run for the full project duration. Site-specific requirements such as access constraints and adjacent occupancy protections are the highest-risk fixed items because they are often missed during bid preparation.
How Should Contractors Track Preliminary Cost During Construction?
Track prelims by category, not as a single lump sum. Supervision, utilities, facilities, safety, and equipment should each have separate cost codes. Review actuals spend against budget weekly and investigate any category trending over budget before the overrun accumulates.
