Nearly 90% of construction projects experience cost overruns — and the leading cause isn't unexpected conditions. It's an incomplete budget that missed cost categories before work started (KPMG, 2024).
Key Takeaways
- 90% of projects experience cost overruns — most from incomplete budgets, not unforeseeable events
- A construction budget has 6 distinct cost categories — missing any one creates a gap
- Contingency is not a slush fund — size it by project risk, draw it down with documentation
- Update the budget at every change order and major procurement — not just at project st
|
Document |
Purpose |
When |
|
Estimate |
Predict costs to set a price |
Before proposal |
|
Budget |
Control costs during execution |
Project start → closeout |
|
Job cost sheet |
Compare actuals to estimate |
Throughout + at closeout |
All three should share the same cost code structure so data flows between them. See our how to estimate construction costs guide and construction job costing guide.
The 6 Budget Cost Categories
1. Hard Costs (65–80% of budget)
Labor (35–45%) · Materials (25–35%) · Subcontractors (15–30%) · Equipment (3–8%)
2. Soft Costs (3–15% of budget)
Permits · Architect/engineer fees · Survey/geotech · Builder's risk insurance · Temporary utilities
3. Site Work and Utilities
Demolition · Grading · Excavation · Utility connections · Site access — frequently underbudgeted
4. Contingency
|
Project Type |
Recommended % |
|
Residential remodel, well-defined |
5–10% of hard costs |
|
Older home (pre-1980) |
10–15% |
|
New residential construction |
5–8% |
|
Historic renovation / gut rehab |
15–25% |
Drawn down by documented change orders only — not by quietly overspending line items.
5. Allowances
Budgeted amounts for owner-selected items (tile, fixtures, appliances). Every allowance needs a selection deadline. Overages are change orders.
6. Overhead and Profit
On cost-plus contracts: explicit line items. On lump-sum: embedded in contract price but tracked internally. See our construction overhead and profit guide.
Copy-Ready Budget Template
CONSTRUCTION PROJECT BUDGET
Project: ___________________________ Date: __________
Owner: _____________________________ Version: v1.0
Contractor: ________________________
═══════════════════════════════════════════════════════════
SECTION 1 — HARD COSTS
═══════════════════════════════════════════════════════════
GENERAL CONDITIONS
Site mobilization / setup $________
Temporary facilities $________
Dumpster and waste disposal $________
Final cleanup $________
SUBTOTAL: $________
SITE WORK
Demolition $________
Earthwork / grading $________
Site utilities $________
SUBTOTAL: $________
FRAMING / STRUCTURE
Structural framing + sheathing $________
SUBTOTAL: $________
THERMAL AND MOISTURE
Insulation / roofing / waterproofing $________
SUBTOTAL: $________
FINISHES
Drywall and plaster $________
Tile (see allowance) $________
Flooring (see allowance) $________
Paint and coatings $________
Finish carpentry / millwork $________
Cabinetry (see allowance) $________
SUBTOTAL: $________
MECHANICAL / ELECTRICAL / PLUMBING
Plumbing (rough + trim) $________
HVAC (rough + trim) $________
Electrical (rough + trim) $________
SUBTOTAL: $________
HARD COSTS TOTAL: $________
═══════════════════════════════════════════════════════════
SECTION 2 — SOFT COSTS
═══════════════════════════════════════════════════════════
Permit and plan check fees $________
Architectural / engineering $________
Builder's risk insurance $________
Other: ____________________ $________
SOFT COSTS TOTAL: $________
═══════════════════════════════════════════════════════════
SECTION 3 — ALLOWANCES
═══════════════════════════════════════════════════════════
Tile: _____ SF × $___/SF $________
Flooring: _____ SF × $___/SF $________
Plumbing fixtures: ___ × $____ $________
Lighting: ___ fixtures × $____ $________
Cabinetry: ___ LF × $____/LF $________
Countertops: _____ SF × $___/SF $________
Appliances: $________
ALLOWANCES TOTAL: $________
Selection deadline: _______________________
═══════════════════════════════════════════════════════════
SECTION 4 — CONTINGENCY
═══════════════════════════════════════════════════════════
___% of hard costs $________
(Drawn by documented change order only)
═══════════════════════════════════════════════════════════
SECTION 5 — OVERHEAD AND PROFIT
═══════════════════════════════════════════════════════════
Overhead: ___% of hard costs $________
Profit: ___% margin $________
═══════════════════════════════════════════════════════════
BUDGET SUMMARY
═══════════════════════════════════════════════════════════
Hard Costs: $________
Soft Costs: $________
Allowances: $________
Contingency: $________
Overhead + Profit: $________
──────────────────────────────────────────────
TOTAL PROJECT BUDGET: $________
Contract Value (signed): $________
Variance: $________
BUDGET HISTORY
v1.0 — [Date] — Original
v1.1 — [Date] — [Change order / procurement update]
Prepared by: __________________ Approved by: ______________
Budget Tracking: 4 Columns You Need
|
Column |
Definition |
|
Original Budget |
Set at project start — never changes |
|
Revised Budget |
Updated for approved change orders |
Committed Cost |
Contracts awarded + POs + invoices received |
|
Forecast at Complete |
Best current estimate of final line item cost |
Update after every approved change order, every subcontract award, and every allowance selection. See our construction change order template.
Relevant Article：Roofing PM Tips: Stay On Time & On Budget
5 Common Budget Mistakes
- Forgetting general conditions — dumpsters, cleanup, temp power aren't in trade budgets (budget 5–8% of hard costs)
- Using $/SF benchmarks without adjustment — regional averages need market, condition, and access adjustments
- 10% contingency on a pre-1980 home — knob-and-tube, galvanized, asbestos, lead paint; 10% is the floor, not the target
- Not updating for change orders — every approved CO must trigger a budget revision
- Allowances with no selection deadlines — open-ended allowances cause schedule delays; set the deadline at budget issue
Sources: KPMG Global Construction Survey 2024 · FMI/Autodesk Construction Disconnected 2024 · NAHB Cost of Construction Survey 2025 · CFMA Benchmarker 2024