How should a subcontractor read the spec book before bidding?

Read your own spec sections first, all three parts. Then read the Division 01 sections that change your cost (allowances, alternates, unit prices, submittals, closeout). Then search the rest of the book for your products and your trade name, because your work often shows up in someone else's section. Everything you find either goes into the price, into an RFI before the RFI deadline, or into a written exclusion on your proposal.

That is the whole method. The rest of this post is how to do it fast and what usually gets missed.

Why subs skip the specs, and why GCs notice

The project manual is long, written in legal language, and often reused from an older job. One estimator described the specs, from the sub's side, as "approximately 20 pages that matter surrounded by 600 that don't" (Estimators Playbook). That is fair. The problem is that the 20 pages are not the same 20 on every job.

GC estimators notice when the specs were skipped. In one r/estimators thread, an estimator at a large GC listed what goes wrong on sub bids again and again: scope sheets not read, project manuals not followed, keynotes missed, material not bid per the product approval pages, bid forms left out. Another thread on the worst missed scope people had seen included an owner who never sent the Division 27 spec to the estimator, and the telecom requirements in it were expensive.

The cost of skipping is not just a miss. A bid that ignores the spec cannot be leveled against bids that followed it, and a GC who has to chase you for a revision every time moves you down the list.

Step 1: Find your sections in the table of contents

Specs are organized by CSI MasterFormat divisions and section numbers. Start with the table of contents and mark every section that touches your work. For a drywall and framing sub that is usually more than the obvious Division 09 sections: think firestopping in Division 07, access doors, backing and blocking, and acoustical requirements. An electrician should look past Division 26 to Division 27 and 28 if low voltage or fire alarm might land in the package, and to the equipment sections in other divisions that need power.

If the table of contents lists a section you expected and the section is missing from the book, that is your first RFI.

Step 2: Read all three parts of each section

Every section uses the same three-part format.

• Part 1, General: what the section covers, related sections, submittals, quality assurance, mockups, warranty. This is where scope gets moved between trades ("work of this section includes...") and where hidden cost lives: mockups, extended warranties, testing, qualifications.
• Part 2, Products: approved manufacturers, performance requirements, substitution rules. This is where you find out whether your usual product is allowed or whether the spec says "no substitutions."
• Part 3, Execution: installation requirements, tolerances, field quality control, cleaning and protection. Finish levels, inspection steps and protection requirements turn into labor hours here.

Subs who only read Part 2 miss most of the cost. Write down every item from Parts 1 and 3 that is not already in your standard price.

Step 3: Read the Division 01 sections that touch money

You do not need all of Division 01. You need the sections that change your number or your obligations:

• Summary of work: phasing, owner-furnished items, work by others, work hours.
• Allowances, alternates and unit prices: these go on the bid form, and a missing alternate can make the whole bid non-responsive on public work.
• Substitution procedures: when a request for substitution is allowed and how. Often only before bid, sometimes never.
• Submittals, quality requirements and closeout: shop drawings, samples, O&M manuals, attic stock, as-builts. Each one is time someone has to pay for.
• Temporary facilities: who provides hoisting, power, water, dumpsters, and protection.

Step 4: Search the whole book for your products and your trade

Your work does not always sit in your division. Use the PDF search for your product names, your trade name, and the words that move scope: "furnish," "install," "by others," "coordinate with," "provide." The same habit applies to the drawings, as one r/estimators commenter suggested: search the plans and specs for keywords before you trust your takeoff.

Step 5: Check the specs against the drawings

Specs and drawings disagree more than anyone admits. Many contracts set an order of precedence between them in the general or supplementary conditions, so read which one wins on this job rather than assuming. When a schedule on the drawings names a product the spec does not allow, or the spec calls for a finish the details do not show, send an RFI before the deadline. If there is no answer by bid day, price what the spec says or write the assumption on your proposal.

Watch for "canned" spec sections that clearly belong to another project. Do not just ignore them: ask in an RFI whether they apply, and if you do not carry them, say so in writing on the proposal.

Step 6: Put what you found into the bid

Everything from the spec read ends up in one of three places:

1. The price: the mockup, the extended warranty, the approved product that costs more than your usual one.
2. An RFI: anything unclear, missing or contradictory, sent before the deadline.
3. The proposal: a short list of the spec sections you bid, the addenda you received, and plain inclusions, exclusions and assumptions. "Per plans and specs" alone protects nobody.

A sub who lists the sections bid is easier to level and easier to award. When you are awarded, check that your proposal, or at least its inclusions and exclusions, is attached to or referenced in the subcontract. The signed subcontract usually controls, and an exclusion that never made it into the contract may not hold.

Where AI fits

The spec read is judgment work, and it should stay with you. The part that eats the evening is everything around it: finding your sheets, counting, measuring and pricing a first pass so you have time left for the spec book. Skoper is AI construction estimating built by Paul Maloney, founder of Skoper and a licensed general contractor. You upload the plan set and get a priced estimate in minutes, with an Assumptions & Sources sheet where every takeoff row names the drawing sheet or schedule it came from. Skoper reads every page you upload, spec pages included, so if you upload the project manual with the drawings, the first pass sees both. You check it, change the prices that matter, and spend the time you saved on Parts 1 and 3.

Run your next bid set through Skoper. Get a priced first pass in minutes, then spend your time on the specs.

Start an estimate

Frequently asked questions

Do subcontractors have to follow the specs if the GC's scope sheet says something different?

Your subcontract usually ties you to the contract documents, which include the specs. If the scope sheet and the spec disagree, ask the GC in writing before bid day and put the answer on your proposal. Contract terms vary, so read your own subcontract, and talk to a construction attorney when the stakes are high.

What is Division 01 and why does it matter to a sub?

Division 01 holds the general requirements that apply to every trade: submittals, substitutions, temporary facilities, closeout. It is where much of the cost that is not in your trade section is hiding.

Can I bid an "or equal" product?

Only if the spec allows it and you follow the substitution procedure in Division 01. If you bid an alternate product anyway, say so plainly on the proposal so the GC can compare bids fairly.

Related reading: How do subcontractors avoid scope gaps and exclusions before bid day? and How do you find your scope in a 600-page plan set before bid day?

Sources

• Estimators Playbook, "Plans and Specifications Part 1": https://estimatorsplaybook.net/2014/08/13/plans-and-specifications-part-1
• r/estimators, "Consistently Incorrect Bids": https://www.reddit.com/r/estimators/comments/1508cmq/consistently_incorrect_bids
• r/estimators, "What's the worst missed scope you've ever seen on a bid?": https://www.reddit.com/r/estimators/comments/1f1fqr0/whats_the_worst_missed_scope_youve_ever_seen_on_a/
• r/estimators, "How do you check to see if you've missed anything on a bid?": https://www.reddit.com/r/estimators/comments/1ay0xzt/how_do_you_check_to_see_if_youve_missed_anything/
• Trunk Tools, "Construction specifications explained" (three-part section format): https://trunktools.com/blog/construction-specifications-explained/
• Construction Specifications Institute (MasterFormat): https://www.csiresources.org/