Connecting Job Costs to Client Estimates

Beyond the Textbook

The textbook focuses on internal cost accumulation—measuring what things cost. This note covers how job costing connects to the client-facing side: estimates, pricing, and variance communication.

What the textbook covers vs. what actually happens

Topic	Textbook	Real Practice
Accumulating costs on job cost sheets	✓ Covered	Foundation for everything below
Using job costs to set prices	Brief mention	Requires estimating before actual costs
Developing client estimates	Not covered	Critical for winning work
Mid-project variance communication	Not covered	Essential for client relationships
Handling scope changes	Not covered	Where most budget problems originate

The full project lifecycle

CLIENT-FACING                          INTERNAL (Chapter 5)
──────────────                         ────────────────────

1. ESTIMATE/QUOTE                      Based on: POHR × estimated hours
                                               + estimated materials
                                               + target margin
              │
              ▼
2. CONTRACT/SOW          ────────►     Becomes the "Sales Order"
                                       Job number created
              │
              ▼
3. PRODUCTION                          Job cost sheet accumulates actuals
              │
              ▼
4. MID-PROJECT CHECK     ◄────────     Compare estimate to actuals
              │
              ▼
5. FINAL DELIVERY        ◄────────     Final job cost sheet
              │
              ▼
6. POST-MORTEM                         Estimate vs. actual analysis
                                       → improves future estimates

How estimates are developed

The estimating formula:

$\text{Estimate}=(\text{Hours}\times \text{Billing Rate})+\text{Materials}+\text{Contingency}$

The billing rate itself comes from job costing logic:

Component	How It’s Calculated
Labour cost	Hourly wage or salary allocation
Overhead recovery	POHR per hour
Margin	Target profit percentage
= Billing rate	What you charge per hour

When actuals diverge from estimates

Scenario	Cause	Response
Under budget	Faster than expected	Deliver as quoted; build goodwill
Over budget (your fault)	Underestimated, inefficiency	Absorb the overage (margin erosion)
Over budget (scope change)	Client added requirements	Change order conversation

The change order conversation

The worst time to discuss overages is on the final invoice.

Good communication pattern:

Timing	Message
At 50% of budget	”Quick update: on track. [X] complete, [Y] in progress.”
When variance emerges	”The additional [Z] will add ~$X. Proceed, or discuss alternatives?”
Before final delivery	”Final costs: $X.[Onbudget/$Y over due to Z]. Here’s the breakdown.”

Contract structures and risk allocation

Structure	How It Works	Who Bears Risk
Fixed bid	Client pays agreed price	You absorb overages, keep underages
Time & materials	Client pays actual + markup	Client bears risk
Estimate with cap	T&M up to maximum	Shared risk
Hybrid	Fixed fee + T&M for extras	Split by phase

The feedback loop

Job costing isn’t just backward-looking. It feeds forward:

Estimate Job #1 → Actual costs → Variance analysis
                                        │
                                        ▼
Estimate Job #2 ← Improved accuracy ←───┘

Every completed job cost sheet should make your next estimate more accurate. If it doesn’t, you’re not learning from your data.

Connection to Chapter 5 concepts

Chapter 5 Tool	How It Supports Estimating
POHR	Determines overhead recovery per billable hour
Job cost sheet	Tracks actuals for variance analysis
Document flow	Creates audit trail for scope changes
Cost accumulation	Provides historical data for future estimates