What Is a Contractor Bid Defense Memo?

Start with the contractor bid review checklist if you need the quick pass/fail items before deciding whether a full memo is worth it.

Why the Term Matters

In construction, most owners negotiate from instinct: “This feels high” or “I thought that was included.” A bid defense memo changes the conversation. It turns a vague objection into a written finding.

Think of it like a redline review for a contract. The contractor bid is the offer. The bid defense memo is the owner’s professional response.

What Goes Into a Bid Defense Memo?

1. Scope Completeness

The memo checks every major trade: demolition, rough plumbing, rough electrical, waterproofing, finish work, cleanup, permits, and inspections. ASCE has written about how scope gaps drive construction disputes. Residential projects have the same problem, just with smaller paperwork.

2. Allowance Adequacy

Allowances are placeholders for unselected materials. Low allowances make a bid look affordable until selections are made.

Benchmarks from HomeAdvisor, Fixr, and RSMeans help, but the reviewer still needs to apply them to the home’s finish level.

3. Line-Item Benchmarking

The memo identifies line items that look high, low, or unsupported. A suspiciously low line can be as dangerous as an inflated one if it hides missing scope.

4. Math and Extension Audit

If 120 square feet at $14 per square foot shows as $1,400, the math is wrong. Engineering News-Record has documented arithmetic errors as a recurring bid dispute issue. A bid defense memo checks those extensions before the contract is signed.

5. Permit and Regulatory Review

Many bids leave permit fees vague. A memo identifies whether permits are included, excluded, or assigned to the owner. AS Estimation’s hidden-cost guidance is a useful reminder that permit and compliance costs often show up late.

6. Negotiation Recommendations

The memo should end with usable language, not just criticism:

Line 7 carries a tile allowance of $3 per square foot installed. Current market for the stated finish level is closer to $12-$15 per square foot. Request a revised allowance or a written exclusion.

That is much stronger than “your price seems high.”

Bid Defense Memo vs. Other Documents

The memo is written in the owner’s interest. That is the distinction.

When Do You Need One?

Use a bid defense memo when:

• You only have one bid
• The bid is lump-sum or lightly itemized
• The price is much higher or lower than expected
• Verbal promises are missing from the written scope
• The contract is over $15,000
• You are reviewing a fix-and-flip rehab budget before closing
• A lender or partner needs budget support

The Joint Center for Housing Studies at Harvard has documented the scale and volatility of renovation spending. The safest time to catch the problem is before signature.

How to Use the Memo

A bid defense memo works best when you use it as a written revision request, not as a vague complaint.

1. Receive the contractor bid.
2. Submit it to CostCheckGPT or another independent licensed GC reviewer.
3. Read the findings and separate must-fix scope gaps from negotiation points.
4. Ask the contractor for a revised bid in writing.
5. Compare the revision to the memo.
6. Decide whether to sign, negotiate further, or walk away.

Is a Bid Defense Memo the Same as a Cost Estimate?

No. A cost estimate says what a project should cost. A bid defense memo says what is wrong with the contractor bid you already received.

How Long Is a Bid Defense Memo?

Most residential memos are two to five pages. The goal is clear findings, not a binder.

What If the Contractor Refuses to Revise?

That is useful information. A contractor who will not respond to specific written findings may not be the right contractor.

Can the Memo Be Used in a Dispute?

It is not legal advice, but it creates a written record of the bid issues you identified before signing.

Get a bid defense memo from CostCheckGPT