Four documents, one that wins: how a bid set settles its own arguments

Drawings disagree with specifications, specifications disagree with the form, and an addendum overrules them all. The set says which one wins — if you find the clause.

October 24, 2026 · 2 min read · by Chasedirt

Sooner or later a bid set contradicts itself. The drawing shows a two-inch line, the specification calls for three; the form says the work is lump sum, the schedule measures it by the foot. The documents know this happens, which is why most of them contain a clause that ranks themselves against each other. Finding that clause before you price is worth more than any single drawing.

The clause has names

It is usually called order of precedence, sometimes interpretation, conflict, or priority of documents. It lives in the instructions to bidders or the general conditions — the front of the set, in the part everyone skips to get to the drawings. Read it once per buyer and you will know their habit for years.

The usual ranking

The order varies by buyer, so treat this as the shape rather than the rule:

• Written changes and addenda — anything issued later beats anything issued earlier.
• The contract form and special conditions.
• Specifications — the written description of what the thing must do.
• Drawings — the picture of where it goes and how big it is.
• Standard specifications and reference standards.
• Schedules and the bid form.

Two things are close to universal: an addendum always beats the original document it changes, because it is later, and a written dimension beats a scaled one, because a scale is a convenience and the number is the instruction. Where the set says figures govern over words, a spelled out quantity loses to a numeral.

Where it bites

The expensive conflicts are rarely dramatic. They are things like a quantity in the schedule that does not match the drawings, a specification naming a product that the drawings show differently, or a division that says "by others" while another division assumes it is in your scope. Each one is a question, and every one of them has a price attached.

What to do when you find one

Ask, in writing, before the question deadline. That is the whole point of the deadline. The answer comes back as an addendum, which then outranks both documents, and everyone prices the same thing.

If the deadline has passed and you still intend to bid, price the version that costs you more, and do not attach a condition to your bid — conditional bids are usually rejected outright, which is number six in the disqualification list. Note the assumption in your own file so that if the answer later goes the other way, you know exactly what it was worth.

Questions are documents too

Many buyers issue the answers to bidder questions as formal addenda, and once issued they carry the same weight as everything else — often more, because they came last. Keep every one. If a buyer answers verbally and never issues it in writing, treat it as a rumour: the addendum is where the real answer lives.