Pre-Construction Services and the DB Business Model

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Estimators who don’t understand the business model they work within are less effective than those who do. This page explains how design-build GC/EPC firms get hired, what they’re paid to do before a GMP is signed, how the GMP contract is structured, and what the firm’s fee mechanics look like. Understanding this context makes you a better estimator — and prepares you for conversations with clients.

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How Design-Build Firms Get Hired

Most manufacturing plant projects follow this sequence:

Owner identifies a capital need
        ↓
Owner issues an RFP (Request for Proposal) or contacts a shortlist directly
        ↓
DB firms respond with qualifications (SOQ) or preliminary proposal
        ↓
Owner selects 2–4 DB firms for final competition
        ↓
Selected firms enter PCSA (Preconstruction Services Agreement)
        ↓
DB firms do preconstruction work (estimating + design development + scheduling)
        ↓
At FEED/Class 3 gate, DB firm presents GMP proposal
        ↓
Owner accepts, negotiates, or rejects the GMP
        ↓
GMP accepted → PCSA transitions into GMP contract → Construction begins

This is NOT a competitive bid. Design-build is a qualifications-based selection. Owners choose DB firms on reputation, relevant experience, team credentials, and their approach to the project — not (initially) on price. Price competition happens at the GMP proposal stage, not the selection stage.

Implication for the estimator: You are part of the selection differentiator. The quality of your Class 4 estimate, your risk narrative, and your ability to explain cost tradeoffs convinces owners that your firm understands the project.

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The Preconstruction Services Agreement (PCSA)

The PCSA is the contract that governs the DB firm’s work from selection through GMP commitment.

What the PCSA Contains

Element	Typical Terms
Preconstruction fee	Reimbursable; covers DB firm’s estimating, design management, scheduling labor during preconstruction
Scope of preconstruction	Defined deliverables at each FEL gate
Design engagement	DB firm engages the A/E and process engineer; A/E fees during preconstruction are reimbursable under the PCSA
GMP commitment date	The milestone by which the DB firm must deliver a GMP proposal
Termination provisions	Owner can terminate at any gate; typically pays for work done to date
Transition clause	If GMP is accepted, PCSA terms roll into the GMP contract

Preconstruction Fee Structure

The preconstruction fee covers the DB firm’s cost to estimate, develop the design, and build the project plan before the GMP. It is reimbursable — the owner pays actual costs, not a fixed amount.

Typical fee range:

Project Size (TIC)	Preconstruction Fee Range	Duration
< $5M	$50K–$150K	4–8 weeks
$5M–$25M	$100K–$400K	6–12 weeks
$25M–$100M	$300K–$1M	10–20 weeks
> $100M	$800K–$3M+	16–30+ weeks

What drives the fee higher: Complex process (many P&ID sheets, multiple equipment packages), owner requires multiple estimate revisions, competitive GMP (owner shortlisted 2–3 DB firms simultaneously, all doing parallel preconstruction), or aggressive schedule that requires more staff.

What happens if the GMP isn’t accepted: The owner pays for the preconstruction work done to date under the PCSA and parts ways. The DB firm’s sunk cost risk is the amount of non-reimbursable overhead allocated to the project (BD time, senior review time, executive time). This is why DB firms are selective about which competitions they enter.

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Gate Deliverables by FEL Stage

At each FEL gate, the estimator must produce specific deliverables. Understanding what’s expected prevents under-delivering (which loses the client’s confidence) or over-delivering (which wastes resources on precision that doesn’t yet exist).

FEL-1 Gate (Class 5 ROM) — Week 1–2

Owner’s question: “Is this project in the right budget range for us to pursue it?”

Deliverable	Detail Level
Class 5 ROM estimate	±50–100% accuracy; parametric $/SF with equipment ROM
Basis of Estimate narrative	1–2 pages; assumptions, exclusions, pricing date, major risks
Preliminary program confirmation	Does 20,000 SF actually accommodate what the owner wants?
Preliminary schedule	High-level (preconstruction + construction duration)
Key risks and open questions	5–10 items that must be resolved to improve accuracy

What NOT to deliver at FEL-1: A detailed breakdown by CSI division. Sub bids. A precise contingency calculation. These imply a precision the estimate doesn’t have.

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FEL-2 Gate (Class 4 Feasibility) — Week 3–6

Owner’s question: “Should we proceed to FEED engineering and GMP?”

Deliverable	Detail Level
Class 4 estimate	±20–30% accuracy; equipment-factored with budget sub quotes
Updated BOE	Expanded; methodology stated for each major cost category
Preliminary design concept	Floor plan + elevation concepts; confirms scope fits the program
Equipment procurement strategy	Long-lead items identified; procurement timeline impact on schedule
Updated schedule	Construction schedule at ±4 weeks accuracy
Design options presented	2–3 value engineering alternatives with cost comparison
Go/no-go recommendation	DB firm states whether the project is viable at this budget and schedule

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FEL-3 Gate (Class 3 GMP Proposal) — Week 7–12

Owner’s question: “Will I sign the GMP?”

Deliverable	Detail Level
GMP proposal document	Cover letter + GMP amount + scope narrative + BOE + schedule + exclusions and qualifications
Class 3 estimate	Full detail by CSI division; sub quotes for major trades
Complete BOE	Every major cost category documented; contingency basis explicit
Subcontractor list (proposed)	Who will bid each major scope; how many bidders per trade
Construction schedule	CPM schedule; key milestones; tie-in shutdown windows
Risk register	Project-specific risks + contingency allocation by risk type
Savings sharing proposal	How savings below GMP are split between owner and contractor
Contract exhibits	BOE, drawings list, scope inclusions/exclusions as contract exhibits

The GMP proposal is a commercial document, not just an estimate. The BOE becomes a contract exhibit. Every inclusion, exclusion, and assumption in it defines what the contractor is and is not responsible for. A weak BOE is a liability.

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GMP Contract Structure

Once the owner accepts the GMP proposal, the PCSA transitions into the GMP contract. The GMP contract has four financial components:

Cost of the Work
    + Contractor Fee
    + Contingency
    = GMP

Cost of the Work

Direct costs the contractor actually incurs: labor, materials, subcontracts, equipment, general conditions. Every dollar of cost of the work must be documented and auditable. Under most GMP contracts, the owner has the right to audit the contractor’s cost records.

Key point: General conditions (superintendent, PM, trailers, temporary utilities) are part of the cost of the work — they are direct project costs, not the contractor’s fee.

Contractor Fee

The contractor’s profit on the project. Usually a percentage of the cost of the work.

Typical GMP fee ranges by project size:

Project TIC	Typical Fee Range	Notes
< $5M	6–10%	Small projects are riskier relative to overhead; lower volume of work per project
$5M–$25M	4–7%	Sweet spot for DB manufacturing plant work
$25M–$100M	3–5%	Larger volume; lower risk per dollar; more competition
> $100M	2.5–4%	Thin margins; competition from national EPC firms

What the fee covers: Corporate overhead allocation, risk retention above contingency, shareholder return, business development cost. The fee does NOT cover general conditions — those are a direct project cost.

Fee negotiation: Owners frequently try to negotiate fee down. The counter-argument: a lower fee reduces the contractor’s ability to absorb unforeseen conditions and reduces the incentive for the contractor to be creative about saving money. A contractor with a 2% fee on a $30M project is managing significant risk for $600K — that’s a thin cushion.

Contingency

Funds held within the GMP to cover uncertainties not priced into the base cost of the work. See GMP Contingency Structure for the full framework.

Who controls contingency: This varies by contract:

• Contractor-controlled contingency: DB firm can draw on contingency without owner approval (up to the GMP). Standard for design development and execution risks.
• Owner-controlled contingency: Owner must approve each draw. Used for scope changes and risks the owner retained.
• Joint contingency: Some contracts split contingency between owner and contractor control.

Savings Sharing

If the final cost of the work is less than the GMP (excluding the contractor fee), the savings may be shared:

Structure	How It Works
Owner gets all savings	Simple; less incentive for contractor to find savings
50/50 split	Common; aligns incentives; contractor shares in value of VE ideas
75/25 owner/contractor	Slightly owner-favored; still incentivizes contractor
Contractor gets all savings	Rare; gives contractor excessive incentive to cut scope

Practical impact for estimators: A savings-sharing contract creates an incentive to spend more time on value engineering during preconstruction. Every dollar of VE that happens before the GMP is signed saves you the contractor’s GMP risk and improves the owner’s final cost. After the GMP is signed, VE savings split with the owner.

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The Estimator’s Role in the PCSA Process

At each gate, the estimator produces the primary deliverable (the estimate and BOE) and supports the project manager in the commercial narrative.

Where estimators often underperform in PCSA:

1. Not updating the BOE as information changes. The BOE at FEL-2 should reflect what you know at FEL-2, not just carry forward the FEL-1 language with updated numbers.

2. Not flagging risks early enough. If you discover at FEL-2 that the site has a stormwater problem, flag it then — don’t absorb it into contingency and hope it doesn’t materialize.

3. Not communicating the accuracy range. Every estimate should be presented with its AACE class and accuracy range. If an owner is treating your Class 3 estimate as a fixed price, correct that expectation in writing.

4. Accepting an unrealistic GMP timeline. If the owner wants a GMP in 3 weeks and the project requires 10 weeks of preconstruction to develop a defensible number, say so. A GMP issued without adequate preconstruction is a GMP with hidden risk.

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From PCSA to Construction — The Transition

When the GMP is accepted, several things happen immediately:

Action	Timing	Who
GMP contract executed	Within 1–2 weeks of acceptance	PM + legal
Schedule of Values (SOV) submitted	Before first pay app	Estimator + PM
Subcontractor bid packages issued	Immediately (many packages should be ready by GMP date)	Estimator + PM
Long-lead equipment POs issued	Within 30 days of GMP; often sooner	PM + procurement
First pay application submitted	30 days after contract execution	PM + estimator
Cost tracking established	Immediately	Estimator + PM

The estimator’s transition role: You built the GMP; now you own the cost baseline. Your estimate becomes the Schedule of Values — the financial structure of the project. Discrepancies between the estimate and the SOV are potential change orders before construction even starts. Make sure the SOV matches the estimate.

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What Owners Are Evaluating in a DB Competition

Understanding what owners want helps you present estimates in a way that wins work:

Owner Concern	What They’re Looking For
Risk transfer	Can this DB firm absorb the risk of incomplete design? Do they understand what they don’t know?
Domain knowledge	Do they understand F&B/CPG construction? Can they speak intelligently about CIP, FDA compliance, brownfield phasing?
Transparency	Is the BOE clear? Can I see where the money is going? Are the exclusions reasonable?
Schedule	Do they understand my operational constraints? Do they know when NOT to do tie-in work?
Cost confidence	Is this estimate calibrated to what similar projects cost, or is it pulled from thin air?
Team	Are the superintendent and PM on this project experienced, or are they backfilling with junior staff?

The estimate is the trust document. A well-structured BOE with a transparent risk narrative tells an owner that you know what you’re doing. A bare number with a thin narrative tells them you don’t.

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Related Pages

• Delivery Methods and Contracts — DB vs. EPC vs. CMAR comparison; contract form overview
• GMP Contingency Structure — the three-layer contingency structure and how draws work
• Estimate Classification and BOE — AACE classes and BOE structure
• Phase-by-Phase Workflow — the full project sequence this process sits within
• Worked Example Class 5 to Class 3 — what the estimates at each gate look like in practice

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