How to Review Construction Plans: A GC's Complete Pre-Bid Guide

Pre-bid construction plan review is a contractor's systematic process for identifying scope gaps, coordination conflicts, and specification errors before submitting a bid. It is not code compliance checking — that's a different job done by building department plan examiners. Manual plan review for a complex commercial set takes a GC estimator 4–8 hours; AI-assisted review compresses that initial pass to under 10 minutes.

When most people search "how to review construction plans," they find guides written for building department plan checkers — government reviewers ensuring code compliance before issuing permits. That's a different job than what a general contractor or subcontractor needs to do before submitting a bid.

A GC's pre-bid plan review isn't about code compliance. It's about bid risk. The goal is to find every scope gap, coordination conflict, and missing detail that could turn a profitable bid into a money-losing job. Those are different failure modes, and they require a different review process.

This guide covers how to review construction plans from the contractor's perspective — what to look for, what order to look in, and how AI is changing what's possible within a typical bid turnaround window.

Pre-Bid Review vs. Permit Review: Know What You're Doing

Before getting into process, it's worth being clear about what kind of review you're doing, because the two are often confused:

This guide is about the second column. If you need the first, you're looking for building department resources, not this.

What You're Looking For (The 4 Categories of Bid Risk)

A pre-bid plan review is hunting for four categories of problems. Every item on your review checklist should trace back to one of these:

1. Scope Inclusions Nobody Defined

Work that's shown on the plans but attributed to no specific trade. "By others" without identifying who "others" is. Design-build scope (performance spec, no detail) that shows up as a defined product by submittal time. Equipment curbs, housekeeping pads, and utility connections at trade boundaries. These are the items that generate disputes about who's carrying the scope — and if nobody's carrying it, somebody's eating it.

2. Coordination Conflicts

Two trades trying to occupy the same space. Ductwork routing through structural members. Plumbing stacks misaligned with floor penetrations. Ceiling heights that can't accommodate all the systems required to run through them. These exist because the design disciplines work somewhat independently — the structural engineer and the MEP engineer are often not coordinating their models in real time.

3. Drawing-to-Spec Conflicts

The drawings say one thing, the specifications say another. The drawings reference a spec section that doesn't exist. The material specified conflicts with what's shown. Alternates in Division 1 don't match the drawing annotations. These are quiet errors that surface during submittals — but if you catch them at bid, you can clarify before your number is locked.

4. Dimension and Detail Inconsistencies

Section details that don't match plan dimensions. Door schedules listing sizes that don't match structural rough openings. Gridlines that shift between disciplines. Column locations that don't agree between architectural and structural. These are usually honest drafting errors, but they generate field RFIs and change orders unless caught early.

The Plan Review Process: Step by Step

Here's a systematic approach to working through a plan set before bid.

Step 1: Start with the Project Manual, Not the Drawings

Before you open a drawing, read Division 1 of the specifications. Division 1 controls the whole project — scope inclusions and exclusions, alternates, allowances, bidding requirements, contract terms, and work sequence. Understand the project delivery method, what the GC is responsible for, and what's potentially excluded before you start counting sheets.

Also pull the drawing index and confirm you have all sheets. Missing sheets at bid = missing scope at bid = problem after contract award.

Step 2: Establish a Review Sequence

Don't open sheets randomly. Work in a consistent order: civil drawings first (site work extent and utility connections), then architectural (building layout and envelope), then structural (framing, foundations, and gravity system), then MEP (mechanical, electrical, plumbing against the structural and architectural backdrop). Work from large-scale plans to small-scale details within each discipline.

This sequence matters because you're building a mental model of the project as you go. When you hit MEP routing, you need to already know the structural framing. If you review in random order, you'll miss conflicts that span disciplines.

Step 3: Check Trade Coordination

This is the highest-value step in any pre-bid review. Overlay MEP routing against the structural framing plan. Check ceiling plenum heights — identify the zone with the tightest clearance and mentally fit all the systems that need to run through it (structure, HVAC duct, sprinkler piping, electrical conduit, plumbing). If it doesn't fit, you have an RFI.

Specific things to look for:

• HVAC supply and return duct routing at structural beam lines
• Sprinkler mains and branches at tight ceiling areas
• Electrical conduit routing through the same ceiling cavity as HVAC
• Plumbing horizontal runs and their required slope in shallow ceiling areas
• Rooftop unit structural support — is the roof framing adequate for the equipment weight?
• Equipment access clearances — can maintenance crews actually get to the units?

Step 4: Cross-Reference Specifications

Every time a drawing notes a specification reference ("see spec section 09 21 16"), add it to a list. At the end of your drawing review, verify each reference exists in the project manual and that the spec content doesn't conflict with what's shown on the drawings. Missing spec sections are either scope exclusions or scope additions waiting to happen.

Also review alternates carefully. Alternates are often described in both Division 1 and on individual drawings — and they sometimes don't match. A bid form alternate that doesn't agree with the drawing annotation is a bid error risk.

Step 5: Identify Scope Boundaries

Read every "by others," "NIC" (not in contract), "by owner," and "design-build" notation in the drawings and specifications. For each one: is it clear who is responsible? Is it included in your scope or excluded? Is it priced somewhere, or is it a gap?

Pay particular attention to:

• Utility connections — where does the GC's work end and the utility company's begin?
• Equipment curbs, pads, and supports — who furnishes and installs?
• Fire suppression system — sometimes split between GC and owner
• Temporary utilities — who pays for construction power and water?
• Technology and low-voltage — often excluded from base bid

Step 6: Check Dimensions and Details

Verify that detail drawings agree with their parent plan views. Column grid spacing on the architectural floor plan should match the structural plan exactly. Door and window rough opening dimensions in the structural drawings should match the door and window schedule in the architectural drawings. Section cuts should show what the plan implies they show.

This step is tedious and fatigues quickly — which is why it's also one of the most common failure modes in manual review. An estimator who's been in a plan set for four hours checking coordination is not reliably catching dimension conflicts on sheet A-501. In a 50-sheet commercial plan set analyzed by SheetIntel, 7 of 30 identified RFIs were dimension or detail inconsistencies — collectively representing $47,000+ in potential change order exposure.

Step 7: Build Your Clarifications List

Every issue you find is either a bid clarification or an RFI. Clarifications go in your bid letter: "This bid includes X and excludes Y; assumes Z." RFIs go to the architect during the bid period for formal responses. Both protect you.

A well-constructed clarifications list also signals to the owner that you reviewed the documents seriously. That matters when you're competing against bidders who didn't flag the same issues you did.

Common Plan Review Mistakes GCs Make

• Reviewing on deadline fatigue. A six-hour continuous plan review on a complex project will miss things. Break it up. Fresh eyes on the second pass catch what tired eyes missed on the first.
• Skipping civil drawings. Site work is where scope gaps hide. Utility service connections, paving limits, and grading extents are frequently under-reviewed at bid time.
• Trusting the last set they reviewed. If you've done three similar projects and they all had the same equipment layout, your brain will fill in details on this one that may not actually be there. Each set is different.
• Not flagging "design-build" scope. Performance specs with no design detail are a blank check. Flag them, price them as allowances, or get a clarification. Don't assume.
• Reviewing one discipline at a time in isolation. MEP conflicts with structural are only visible when you're looking at both simultaneously. Siloed review misses the interface problems.

How AI Changes the Plan Review Process

The steps above describe what a thorough manual review looks like. An experienced estimator working 6–8 hours on a 200-sheet plan set will catch most things. The failure modes are fatigue, time pressure, and the fundamental limit that human attention can only hold so many things at once.

AI plan review tools like SheetIntel work as a first-pass layer — reading every sheet across all disciplines simultaneously, cross-referencing specification references, flagging coordination conflicts with specific sheet and detail callouts, and surfacing "by others" scope language systematically. SheetIntel reviews a 50-page plan set in under 10 minutes, generating a structured RFI list organized by trade and priority. The output tells your estimator exactly where to look.

This doesn't replace the estimator's judgment. It front-loads the systematic work so the human review time goes to the items that actually need judgment — pricing ambiguous scope, evaluating design-build risk, deciding which clarifications to call out in the bid letter.

The result: more thorough coverage in less time, on every job, not just the ones where you have enough lead time for a thorough manual review.

The Bottom Line

Reviewing construction plans before bidding is one of the highest-leverage activities in a GC's pre-construction process. Every scope gap caught before the contract is signed saves the cost of catching it in the field — typically 3–5x more expensive at that stage.

The process isn't complicated: read Division 1 first, establish a review sequence, check coordination, cross-reference specs, map scope boundaries, verify dimensions, build your clarifications. What makes it hard is scale — 300-sheet plan sets on 48-hour bid turnarounds with a team that's already working three other projects.

That's the problem AI plan review solves. Not by replacing the estimator's expertise, but by making the systematic first pass fast enough that thorough review is possible on every bid — not just the ones where you have time.