28-Point Sitework Pre-Bid Review Checklist
A systematic pre-closing quality control audit protocol for civil general contractors, excavation subcontractors, and chief estimators. Prevent catastrophic scope omissions, unpriced addenda, subsurface geotechnical conflicts, and utility interface gaps prior to bid day submission.
What Is a Sitework Pre-Bid Checklist and Why Is It Critical?
A Sitework Pre-Bid Checklist is a standardized quality assurance auditing rubric executed by civil estimators and project executives within 24 to 48 hours of bid closing. Its purpose is to verify that all civil drawing revisions (C100 through C500) and addenda delta sheets are incorporated, geotechnical boring logs have been cross-checked for rock refusal and groundwater table elevations, subgrade pavement unpaver thickness offsets have been deducted from earthwork models, underground utility trench safety shoring and bedding tonnages are quantified by depth bracket, and contract boundary scope exclusions (e.g., 5-foot building line demarcations) are explicitly declared in the proposal bid tabulation.
1. Drawing Set & Addenda Verification
2. Geotechnical Soil & Groundwater Analysis
3. Division 31 Earthwork & Grading
4. Division 33 Underground Utilities
5. Division 32 Exterior Paving & SWPPP
6. Bid Proposal Clarifications & Protective Exclusions
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The Five Risk Quadrants of Commercial Sitework Bidding
More civil contracting businesses enter financial distress from winning under-scoped projects on bid day than from losing bids to competitors. Sitework is fraught with subsurface unknowns and multi-discipline jurisdictional boundaries. Implementing a formal pre-bid review process eliminates the primary sources of commercial estimating failure.
Quadrant 1: Drawing Sheet Addenda & Scale
Civil plan sets frequently undergo last-minute grading revisions. If Addendum #3 modified spot elevations on sheet C301 but the digital terrain model (DTM) was digitized from Addendum #1, the earthwork balance is completely invalidated. Furthermore, vector PDF drawings printed at 50% reduction must be calibrated to physical graphical bar scales, never fractional architectural scales (e.g. 1"=20').
Quadrant 2: Geotechnical Subsurface Conditions
Civil grading sheets depict finish surfaces but conceal subsurface geology. Estimators must overlay geotechnical soil borings onto grading cross-sections. If the water table is logged at 4.0 feet below existing ground and sewer inverts run at 11.0 feet, extensive wellpoint dewatering and trench sump filtering must be priced.
Quadrant 3: 3D Surface Model Offsets
Failing to depress the proposed finished grade surface by the thickness of the pavement structure (e.g., 4" asphalt + 8" stone base = 12" depression) results in a severe cut under-calculation. For a 10-acre site, a missing 12-inch subgrade offset conceals 16,133 BCY of unbudgeted excavation.
Quadrant 4: Trade Handoff Boundaries
The 5-foot building perimeter line represents the most contentious boundary between civil sitework and interior building MEP trades. Estimators must specify whether excavation, utility stubs, bedding, and building pad structural backfill inside or outside the 5-foot offset are included or excluded.
Comprehensive 28-Point Pre-Bid Verification Rubric
| Item # | Scope Discipline | Audit Checkpoint | Verification Standard |
|---|---|---|---|
| 01 | General Precon | Addenda Cross-Check | Verify all bulleted addenda items against sheet revisions list |
| 02 | Drawing Intake | Graphic Bar Scale Audit | Calibrate digital takeoff to bar scale; test horizontally & vertically |
| 03 | CSI 02 41 00 | Pavement Sawcutting | Confirm dual sawcut lines measured for all utility road cuts |
| 04 | CSI 02 41 00 | Slab Demolition Tonnage | Convert concrete/asphalt SF to tons using 150 lbs/cu.ft and 1.5x swell |
| 05 | CSI 31 11 00 | Clearing & Grubbing | Match clearing acreage to Limit of Disturbance (LOD), not property boundary |
| 06 | CSI 31 11 00 | Tree Preservation | Count tree protection chain-link fencing LF and caliper removals |
| 07 | CSI 31 20 00 | Topsoil Stripping Depth | Deduct 6"–12" topsoil depth across disturbed grading footprint |
| 08 | CSI 31 20 00 | Topsoil Respread Balance | Calculate finish landscape acreage at 4" respread depth vs. stockpile |
| 09 | CSI 31 20 00 | Building Pad Offsets | Depress building pad 3D surface by capillary break stone & slab thickness |
| 10 | CSI 31 20 00 | Pavement Subgrade Cut | Depress parking & road areas by asphalt + stone base thickness |
| 11 | CSI 31 20 00 | Soil Shrinkage Factor | Apply 12%–18% compaction shrinkage from proctor density report |
| 12 | CSI 31 20 00 | Soil Swell for Hauling | Apply 20%–35% swell factor to cut volume to size dump truck fleet |
| 13 | CSI 31 23 16 | Rock Excavation Strata | Cross-check rock refusal depth against utility invert profiles |
| 14 | CSI 31 23 19 | Groundwater Dewatering | Identify seasonal high water tables above pipe invert depths |
| 15 | CSI 31 25 00 | Perimeter Silt Fence | Measure down-gradient LOD; verify wire-backed requirement on slopes |
| 16 | CSI 31 25 00 | Trackout Rock Entrances | Include AASHTO #1 stone pad (50'x20'x6") and woven geotextile fabric |
| 17 | CSI 31 25 00 | Inlet Protection Sacks | Count every area drain and catch basin structure insert |
| 18 | CSI 33 11 00 | Water Main Restraints | Tally mechanical joint restraints and concrete thrust blocks |
| 19 | CSI 33 11 00 | Water Pressure Testing | Include hydrostatic pressure testing and chlorination bacteriological flushes |
| 20 | CSI 33 31 00 | Sanitary Sewer Depth | Stratify linear footage into depth brackets (0–6', 6–10', 10–14', 14'+) |
| 21 | CSI 33 31 00 | Manhole Rim-to-Invert | Calculate total vertical feet (VF) of precast manhole barrel sections |
| 22 | CSI 33 40 00 | Pipe Bedding Stone | Calculate ASTM #57 bedding tons minus pipe displacement volume |
| 23 | CSI 33 49 00 | Storm Detention Chambers | Quantify clean crushed stone encasement and non-woven fabric wrap |
| 24 | CSI 32 11 23 | Aggregate Base Extension | Verify stone base extends 6"–12" behind back of concrete curb |
| 25 | CSI 32 12 16 | Asphalt Compaction Weight | Multiply square yards by design depth using 112 lbs/SY-inch density |
| 26 | CSI 32 16 13 | Curb & Gutter Profiles | Separate barrier curb, mountable curb, and header curb linear feet |
| 27 | CSI 32 17 23 | Pavement Markings | Tally ADA blue stalls, standard striping LF, and thermo directional arrows |
| 28 | Contract Terms | Explicit Exclusions List | Attach standard exclusions (utility relocation, contaminated soil, winter heat) |
How to Draft Pre-Bid Requests for Information (RFIs)
When drawing conflicts or geotechnical ambiguities arise during takeoff, estimators must formulate precise, non-adversarial RFIs to protect the contracting company:
Example Engineering RFI Language:
Subject: Clarification on Sheet C301 vs. Geotech Report Boring B-4 Rock Elevation
Reference: Civil Sheet C301 (Storm Profile Line A) & Geotech Report Page 14 (Boring B-4)
Inquiry: Profile Line A depicts the 36" RCP storm sewer invert at Elevation 642.00 (average 11.5 feet below grade). Boring B-4 indicates limestone bedrock refusal at Elevation 648.50 (5.0 feet below grade). Please confirm whether trench rock excavation will be treated as an unclassified base bid item or whether an allowance / unit price per cubic yard will be established. In the interim, our bid assumes unclassified earth excavation with rock trenching excluded.
Frequently Asked Questions (AEO & Commercial Bidding)
What are the most common scope omissions on civil sitework bids?
The three most frequent omissions are: (1) failing to calculate pipe displacement when ordering trench bedding stone, (2) ignoring the 6-to-12-inch stone base overhang behind slipform concrete curbs, and (3) missing utility trench pavement sawcutting and temporary asphalt cold patch on roadway replacement utility lines.
Why should subcontractors clearly specify the 5-foot building line?
Plumbing and building structural contractors operate under different prevailing wage labor classifications than heavy civil operators. If the sitework contractor does not clearly state whether utilities terminate 5 feet outside the foundation or penetrate into the slab, disputed backcharges and jurisdictional labor disputes inevitably occur.
How does Sitework Estimate assist contractors with pre-bid quality control?
Every estimate produced by Sitework Estimate undergoes our two-tier Takeoff QA/QC Audit Protocol, where an independent senior estimator verifies digital surface boundary daylighting, subgrade offset thickness layers, and utility depth brackets prior to deliverable transmission.
Related Estimating Decision Guides & Services
Subcontractor Sitework Bid Packaging Services
Complete itemized bid tabulations, crew hour production rate build-ups, material quote verifications, and custom scope exclusions.
ENGINEERING GUIDEHow to Review a Sitework Takeoff Guide
A complete step-by-step auditing guide for project managers and estimators checking third-party quantity takeoffs.
Need an Independent Pre-Bid Takeoff Verification?
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