General Conditions (P&G) in Construction: A Practical Guide

By

Josh Krissansen

Last Updated Mar 25, 2026

By

Josh Krissansen

Pricing matters, but time on site is one of the most common ways margin is eroded on a construction project.

Every extra week incurs costs that do not scale with progress, including supervision, preliminary staff, site facilities, compliance, and insurance.

These costs do not pause when work slows, and they rarely attract the same scrutiny as trade packages. When they are underestimated or poorly controlled, general conditions, often referred to in Australia as Preliminaries or P&G (Preliminaries & General), quietly drain profitability long before the financials tell the story.

This article explains what preliminaries include, how they relate to contract conditions and project specifications, and how consistent planning and tracking can turn them into a controllable commercial lever rather than an unpriced risk.

What Are General Conditions (P&G) in Construction?

General conditions (called preliminaries or P&G in Australia) are the indirect, time-related resources and management costs required to run a construction project.

They do not define how a project is governed, but price the people, facilities, and overhead needed to meet the administrative, coordination, and compliance obligations set out elsewhere in the project documentation.

In practice, preliminaries cover indirect non-trade-specific costs that support the project as a whole rather than a single scope of work. These costs sit outside direct labour, materials, and plant and typically accrue over the duration of the project.

On Australian projects, the obligations that drive preliminaries are defined through the contract conditions and project specifications. The associated costs are then captured and managed through preliminaries within cost plans, tenders, and commercial reporting systems.

What Do General Conditions (P&G) Include?

Preliminaries consist of the indirect, time-related cost categories required to support site operations throughout the project.

These allowances typically cover project and site management staff, temporary facilities and utilities, safety and environmental controls, insurance and bonding, waste services, logistics, and the administrative effort required to comply with contract conditions and specifications. 

Because these costs are duration-driven, they increase when the programme extends, even if the physical scope of work remains unchanged.

For this reason, preliminaries must be planned and monitored separately from trade work. A clear breakdown allows project teams to forecast exposure, price variations accurately, and avoid margin erosion caused by extended supervision and site overhead.

Project Management

Project management forms the core of preliminaries because it coordinates delivery and ensures contractual and regulatory obligations are met.

This category includes project managers, site managers, construction managers, project engineers, and site administration staff responsible for coordinating subcontractors, maintaining documentation, and managing approvals and communication. It also includes the administrative effort required to support daily operations, such as RFIs, shop drawings, site diaries, progress meetings, and programme updates.

Project management labour is regularly one of the largest components of preliminaries. Accurately planning this effort is critical to avoiding under-resourcing and protecting project margins over the life of the works.

Site Management

Site management covers the physical conditions and controls required to allow work to proceed safely and efficiently.

It includes access control, delivery coordination, traffic and logistics planning, and compliance with noise, dust, and working hour restrictions. Safety activities such as toolbox talks, inspections, and incident reporting sit within this category, along with temporary facilities including site offices, storage containers, amenities, fencing, and signage.

Waste removal, recycling programs, erosion and sediment controls, and stormwater management are also typically managed through preliminaries. Strong site management reduces disruption, avoids regulatory intervention, and limits programme impacts that can quickly translate into commercial risk.

Regulatory Compliance and Approvals

Regulatory requirements shape sequencing, inspection cycles, and programme risk throughout the project.

Preliminaries must allow for the time and resources required to manage approvals, inspections, and ongoing compliance with statutory and authority requirements. This includes coordination with councils, building surveyors, and other approving bodies, as well as managing conditions imposed by planning approvals and environmental permits.

Under Australian Standard contracts, such as AS 4000, Work Health and Safety obligations and related documentation requirements further influence administrative effort and site supervision. 

Permit delays continue to be a significant cause of schedule overruns. The Infrastructure Australia National Study of Infrastructure Risk identifies approval process delays, including statutory and environmental permits, as a key contributor to schedule risk on major Australian projects

Insurance and Bonding

Insurance and bonding provide essential financial and legal protection for the project and are commonly managed through preliminaries.

This category typically includes public liability insurance, workers’ compensation, contract works insurance, professional indemnity where required by contract or delivery model, and the administrative effort associated with maintaining certificates and policy compliance. Performance and payment bonds are also managed within this scope when required by the contract.

Workers' compensation can represent a significant component of total labour costs. In some jurisdictions, construction and high-risk trades attract premium rates above the national average, typically in the range of ~2 % or more of total wages, depending on industry classification and claims experience.

This underscores the importance of accurately allocating these premiums. Maintaining complete coverage prevents work stoppages and reduces exposure to legal and financial risk.

General Conditions (P&G) vs Contract Conditions and Project-Specific Specifications

Preliminaries, contract conditions, and project-specific specifications each play a distinct role in how construction projects are scoped, governed, and costed. Understanding how they differ and interact is essential to allocating responsibility correctly and avoiding gaps that lead to underpriced time-related exposure.

• General Conditions (P&G)

  Preliminaries are the indirect resources and management costs required to run the project. They cover personnel, temporary facilities, logistics, compliance activities, and the site overheads that support delivery. 

• Contract Conditions

  Contract conditions define how the project is administered and governed.
  
  On Australian projects, these are typically based on Australian Standard forms and establish roles and responsibilities, approval pathways, notice requirements, payment processes, variations, extensions of time, and risk allocation. They set the rules for how decisions are made, how information flows between parties, and how time and cost are assessed during delivery.
  
  Administrative obligations imposed by the contract, such as reporting requirements, coordination meetings, inspection regimes, and approval workflows, create ongoing management and supervision effort. While these obligations are defined contractually, the cost of meeting them is carried through preliminaries.

• Project-Specific Specifications

  Project-specific specifications define the technical and performance requirements for the permanent works and are commonly structured using NATSPEC.
  
  In addition to materials, workmanship, and tolerances aligned with the National Construction Code and relevant Australian Standards, specifications often include procedural and coordination requirements. These may cover testing and inspection regimes, environmental controls, sequencing constraints, documentation requirements, and handover obligations.
  
  While these requirements form part of the scope of works, they frequently increase site supervision, coordination effort, temporary works, and logistics. The resources required to manage these impacts are not priced within trade packages but are captured through preliminaries.

How They Work Together

Contract conditions and project-specific specifications establish what must be done and how delivery must be managed. Preliminaries provide the resources required to support those obligations.

For example, if specifications introduce waste separation requirements or complex installation sequencing, the additional supervision, coordination time, facilities, and logistics required to manage those constraints are captured in preliminaries.

Similarly, if the contract conditions mandate weekly coordination meetings, formal inspection cycles, or extended approval processes, the associated project management and administrative effort is also funded through preliminaries.

Viewing these elements as an integrated system allows project teams to link contract obligations to resources, align budgets with delivery reality, and avoid underpricing time-related exposure that later erodes margin.

Applying These Distinctions to Live Projects

A practical way to apply these distinctions during budgeting is to review the contract conditions and project-specific specifications alongside the P&G allowance.

Each contractual and specification-driven obligation should be tested against the preliminaries to confirm that sufficient labour, supervision, facilities, and time have been allowed to support it. Where requirements impose ongoing coordination, inspection, or reporting effort, the associated project management and site overhead must be captured in P&G rather than assumed within trade pricing.

For example, specifications may require waste separation, environmental controls, or complex installation sequencing. While these obligations form part of the scope of works, the cost of bins, haulage, additional supervision, and coordination time sits within preliminaries. Similarly, if the contract conditions mandate regular coordination meetings, inspection cycles, or approval processes, the administrative and management effort required to support them is also funded through P&G.

When a variation extends the programme, these indirect costs increase even if the physical scope remains unchanged. Recognising this relationship early allows teams to forecast time-related exposure accurately, recover extended preliminaries where entitled, and maintain commercial control throughout delivery.

How to Estimate General Conditions (P&G) Costs

Accurate P&G estimating requires a structured approach that links contractual obligations, site conditions, staffing requirements, and time-related overheads.

The objective is to capture the full cost of running the project for its planned duration and to set allowances that reflect the resources required to comply with the contract conditions and project specifications. Because preliminaries escalate quickly when programmes shift, disciplined estimating is critical to protecting margin.

Start With Historical and Contractual Baselines

Review historical data from comparable projects to establish typical P&G ranges based on project type, duration, and location. This provides a credible benchmark during early estimating.

Examine the tender documentation, including the contract conditions, project-specific specifications, drawings, and schedules, to confirm the full set of administrative, coordination, and compliance obligations that will drive time-related costs.

Analyse Site Conditions and Local Requirements

Perform a site review to assess access, logistics, drainage, subsurface conditions, and the availability of utilities. These factors influence site establishment, temporary works, and ongoing overhead.

Identify council requirements, approval conditions, working hour restrictions, parking constraints, and Work Health and Safety obligations that affect daily operations. Project-specific risks such as weather exposure or environmental controls should be reflected in both duration-based and event-based allowances.

Calculate Personnel and Supervision Costs

Establish the staffing profile required for the full project duration, including project managers, site managers, project engineers, contract administrators, and site support staff. Apply fully loaded labour rates that account for wages, superannuation, workers’ compensation, and applicable allowances.

Staffing levels should align with programme length, site complexity, and contractual supervision requirements. Underestimating management effort remains one of the most common drivers of preliminaries overruns.

Estimate Site Overheads and Temporary Facilities

Quantify establishment and demobilisation costs for site offices, amenities, fencing, security, and services. Allow for ongoing expenses such as temporary power, water, communications, cleaning, waste removal, and general site maintenance.

Include logistics and material handling requirements associated with receiving, storing, and protecting materials. These costs scale with duration and must be aligned with realistic programme assumptions.

Account for Compliance, Insurance, and Quality Management

Include allowances for Work Health and Safety measures, environmental controls, required signage, inspections, testing, and quality assurance activities mandated by the contract and specifications.

Allocate appropriate premiums for public liability, workers’ compensation, contract works insurance, and performance bonds where required. These items carry material financial risk and should be accurately costed from the outset.

Use Duration-Based and Event-Based Costing

Use duration-based costing for time-dependent items such as management salaries, site offices, utilities, cleaning, and routine maintenance. Apply event-based costing for mobilisation, approvals, inspections, testing, and finalisation activities.

Validate duration assumptions against the programme to ensure preliminaries reflect the actual construction schedule.

Apply the Resource and Duration Method

Build preliminaries by applying resource costs over the projected site duration. Percentage-based allowances may be used during early design but should be replaced with detailed, resource-based estimates at tender.

This approach improves transparency and strengthens commercial control by directly linking cost exposure to time.

Include General and Administrative Allocation

Where applicable, include an appropriate allocation of business overheads in line with internal policy and project scale. This should be applied consistently and clearly separated from site-based preliminaries to avoid double-counting.

Add Contingency for Unknowns

Apply contingency based on project complexity, typically between 5-10% of the P&G allowance. Adjust for risks such as weather delays, design changes, and variationsthat extend the programme and increase time-based overheads.

Strengthen Accuracy Through Connected Workflows

Use integrated construction platforms to connect estimating, financials, and cost tracking. This provides real-time visibility into commitments and expenditure. Capture variation impacts immediately to avoid uncompensated extensions of supervision and overhead.

Compare actual costs with estimates on a monthly basis to identify variances early and adjust forecasts before overruns accumulate.

Why General Conditions (P&G) Affect Project Success

Preliminaries have a direct impact on financial outcomes, schedule performance, safety, and commercial control across the project. They fund the people, systems, and site infrastructure required to comply with contract conditions and specifications and to keep the project operating day to day.

When planned and managed effectively, preliminaries protect margin, reduce delivery risk, and support predictable outcomes.

Protect Financial Stability and Margin

Preliminaries can represent a significant portion of the total construction cost, making accurate allocation and tracking essential for project profitability. These allowances fund site resources, supervision, mobilisation, and demobilisation. When these items are undercosted, contractors absorb the gap, resulting in eroded margins.

Cash flow certainty depends on aligning P&G expenditure with Progress Claims and the Schedule of Values, which allows indirect costs to be recovered as they accrue.

Inaccurate billing remains a significant contributor to contractor insolvency in Australia, making tight control of these costs essential. Insurance and bond allowances within P&G form part of the same financial framework, which limits exposure and protects both the contractors’ and client's interests.

Support Operational Efficiency and Schedule Performance

P&G resources determine how effectively the site operates daily. Site management, logistics, utilities, and temporary facilities must be adequately funded to maintain productivity. Shortfalls often create avoidable delays caused by poor access, insufficient services, or inefficient material handling.

Project management roles funded through P&G coordinate subcontractors, maintain programme accuracy, and support timely decision-making. Variations must be managed through documented processes that capture extended overheads.

Because P&G items accrue daily, unmanaged delays have an immediate and material impact on margin.

Maintain Safety, Quality, and Compliance

P&G includes the resources required to maintain compliance with Work Health and Safety laws, environmental controls, and site-specific safety measures. These costs prevent incidents, penalties, and work stoppages.

Quality assurance activities, testing, and inspections are also conducted within P&G, ensuring compliance with specifications, the National Construction Code, and relevant Australian Standards. Structured closeout processes, including defects, warranties, and as-built documentation, rely on these allowances to meet contractual obligations and secure final payment.

Reduce Disputes and Strengthen Commercial Clarity

Clear preliminaries provide certainty about roles, responsibilities, and cost ownership. This reduces conflict between contractors, subcontractors, and clients and supports consistent commercial interpretation.

Well-documented P&G activities also support accurate valuation of variations.

This protects against underclaimed overheads and supports fair compensation for extended supervision and site costs. Reliable communication between the field and office keeps commercial decisions grounded in real site conditions rather than assumptions.

Drive Predictable, Profitable Delivery

Preliminaries should be treated as a core commercial control, not discretionary overhead. Maintaining real-time visibility of P&G expenditure allows project teams to identify variances early, protect margin, and keep delivery aligned with the programme.

Strong P&G management creates predictable budgets, compliant outcomes, and confident client relationships.

General conditions (P&G) determine the commercial performance and predictability of every construction project

Accurate planning and management of preliminaries gives projects the resources, controls, and oversight needed to meet contractual, financial, and compliance obligations.

Clear visibility into what preliminaries include and how they are estimated and tracked protects margin, supports programme certainty, and drives consistent commercial outcomes across the project lifecycle.

Written by

Josh Krissansen

62 articles

Josh Krissansen is a freelance writer with two years of experience contributing to Procore's educational library. He specialises in transforming complex construction concepts into clear, actionable insights for professionals in the industry.

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