Preliminary and General Cost Management: How GCC Contractors Stop Underpricing Site Overheads

The P&G Problem No One Talks About

On GCC construction projects, most margin conversations focus on subcontractors and materials. Yet project after project, the cost overrun that surprises the commercial team is not a concrete pour that went wrong — it is site overhead that ran six months longer than the contract programme.

Preliminary and General costs — P&G — cover everything required to deliver the project that is not the permanent works: site compound, project management team, security, welfare facilities, temporary cranes and hoists, scaffolding, utilities, communications, quality and HSE management, insurance, and general administration. On a SAR 200M project, P&G typically runs SAR 18M to SAR 30M — between 9% and 15% of contract value. That is a significant cost centre to price correctly at tender and track carefully during execution.

Most contractors get both wrong.

What Belongs in P&G: A Structured Breakdown

The confusion starts at tender. Contractors without a structured P&G schedule either lump everything into a single line item ("site overheads") or scatter P&G costs across work packages in ways that make post-contract tracking impossible.

A clean P&G schedule organises costs into five categories:

• Staff and management: Project manager, engineers, QS, HSE officers, document controller, foremen — salary, allowances, accommodation, and transport for the entire project management team
• Site establishment: Compound construction and removal, welfare facilities, site offices and furniture, temporary roads and fencing, site lighting, signage, and full demobilisation costs
• Temporary plant: Tower cranes, hoists, generators, scaffolding systems, formwork where cost-plus, dewatering — all equipment serving the project but not allocated to a specific work package
• Utilities and communications: Temporary power, water, telecommunications, and internet infrastructure for site and compound
• Quality, HSE, and admin: QA programme costs, safety training, insurance premiums, permits and fees, survey teams, and third-party testing costs

Each category needs a budgeted monthly rate and a duration — because duration is exactly where P&G goes wrong.

Why P&G Bleeds on GCC Projects

A GCC contractor wins a SAR 180M hospital project on a 24-month programme. The P&G schedule prices 24 months of staff, utilities, compound rental, and crane hire. The project runs 34 months. Ten extra months of P&G at SAR 1.2M per month is SAR 12M in cost the contractor pays unless variation entitlement is captured and claimed under FIDIC.

Three mechanisms cause this bleed:

Lump Sum Pricing Without Duration Records

When P&G is priced as a lump sum — "SAR 22M for site overheads" — the underlying assumption disappears the moment the project starts. There is no record of whether that sum assumed 18 months or 30, how many staff were modelled, or what crane hire rates were used. Any delay event becomes impossible to quantify properly. The contractor cannot build a time-related variation claim against a basis that was never documented.

No Monthly Rate Comparison

Most cost reports show P&G as a single budget versus cumulative actual. SAR 9M budget, SAR 7.2M spent to date. That looks healthy — until you realise it is month 18 of a 24-month project and staff costs are running SAR 420K per month against a tendered rate of SAR 375K. That gap has been compounding for 18 months without anyone noticing.

P&G Not Linked to Programme Extension Events

Delay events that extend the programme should automatically flag their P&G cost implications. A six-week client-caused access delay identified in week 14 carries an immediate P&G consequence — but if P&G tracking is disconnected from the schedule, the commercial team only discovers the cost impact months later, when assembling the claim under time pressure.

Building a Live P&G Cost Tracker

A working P&G tracker needs four components:

Monthly Rate Cards Per Line Item

Every P&G cost item gets a budgeted monthly rate derived from the tender pricing. For staff: role, headcount, monthly salary plus allowances. For plant: daily or weekly hire rate and utilisation assumption. For compound: monthly lease cost. For utilities: estimated monthly consumption. These rates become the benchmarks for ongoing comparison.

Live Monthly Variance

Each month, actual P&G spend by category is compared against budgeted rate multiplied by elapsed months. A SAR 850K actual against SAR 720K budget in month 7 triggers an investigation — is this a rate variance (more staff than planned) or a timing variance (accelerated mobilisation that will self-correct)? That distinction determines whether the response is a variation claim or a management action.

Duration Extension Flagging

When a delay event is logged in the project change register, the P&G tracker calculates the P&G cost at risk per additional week. If the monthly run rate is SAR 1.4M and the programme is threatened with an eight-week extension, that is SAR 2.56M of P&G exposure requiring a FIDIC Clause 20 notice within 28 days of the delaying event becoming apparent.

Forecast to Complete

Each month the P&G forecast is updated: remaining duration multiplied by current monthly rate, adjusted for known scope changes, equipment release schedules, and planned demobilisation costs. This feeds directly into the project EAC. A project on budget for permanent works can be loss-making on P&G if the programme is extending and nobody is tracking it.

P&G in Variation and EOT Claims

Time-related P&G is typically the largest recoverable cost component in EOT claims — and consistently the most under-quantified, because the contractor cannot demonstrate the original tender basis.

Under FIDIC Yellow and Silver Book, time-related costs are recoverable under Clause 20.2 when the delaying event is an employer risk. The quantification requires three things: the original P&G duration assumption from tender, the actual monthly P&G cost from project records, and the number of delay months attributable to the specific event.

Contractors with a structured P&G schedule in their contract submission can answer all three questions in a day. Contractors who priced P&G as a lump sum spend weeks reconstructing assumptions that the client QS will then challenge.

On a SAR 300M project in Riyadh, a GC recovered SAR 11.4M in time-related P&G under a 4.5-month EOT — possible only because the original contract appendix included a P&G schedule broken into categories with monthly rates. The same claim without that schedule would likely have settled at SAR 5–6M after negotiation. The practical rule: always price P&G on a rate schedule, even when the BOQ only asks for a lump sum. Include the schedule as a contract appendix. It costs nothing at tender and is worth millions at final account.

Five Practical Starting Steps

If your current P&G management is a single budget line and a monthly actuals figure, here is how to close the gap without a system overhaul:

1. Reconstruct the tender P&G assumption: For every active project, recover the P&G basis from the tender submission. What duration was assumed? What staff levels? What plant hire rates? This becomes the baseline for all comparison and claim quantification going forward.
2. Build a P&G line-item register: One row per cost item with budgeted monthly rate, start month, end month, and total budget. Two to four hours per project. The foundation for everything else.
3. Set up monthly rate comparison: Compare actual P&G by category against budgeted rate multiplied by elapsed months each month. Flag any category running more than 10% over rate for investigation at the next commercial meeting.
4. Link to the change register: When a delay event is logged, add a standing agenda item to calculate P&G cost at risk at the current run rate and prepare the preliminary Clause 20 notice quantum if the event is employer-risk.
5. Budget demobilisation explicitly: P&G does not stop at practical completion. Compound removal, equipment handover, as-built documentation, DLP staffing, and close-out audit costs are all P&G. Price them specifically rather than assuming the final month of normal run rate covers everything — on a SAR 200M project, demobilisation P&G routinely runs SAR 1.5M to SAR 3M beyond practical completion.

The GCC Context

P&G management is particularly critical on Vision 2030 mega-projects where programme extensions are structurally common. NEOM packages, ROSHN residential clusters, and Aramco capital programmes regularly run longer than the original contract period — not because contractors perform poorly, but because interdependencies across parallel packages, late client decisions, and permitting delays compound across long programmes.

Contractors working in this environment need P&G schedules embedded in their project cost system, not managed in a standalone spreadsheet that nobody updates. The P&G register should be updated monthly as part of the cost report cycle, forecast to completion reviewed at each commercial meeting, and delay-event P&G implications captured within 14 days of the event becoming apparent — in line with FIDIC Clause 20.2.1 notice timing.

The contractors who build this discipline early protect margin on every project that runs long. The contractors who do not discover the problem at final account — when the opportunity to recover is significantly reduced and the relationship with the client is already under pressure.