The subcontractors who win profitable work are not always the cheapest — they are the ones whose bids are clear, complete, and defensible. The steps below are the order a careful estimator works in, and the habits that keep a low number from turning into a losing job.
1. Read the documents before you commit
Start with a fast pass to decide whether to bid at all: is your scope really in it, is the site in your market, and is there enough time? If yes, read for real — plans, specifications, the instructions to bidders, and the bid form. The specs often carry requirements the drawings do not show. Deciding what to pursue is its own skill; see how to evaluate construction leads.
2. Attend the pre-bid meeting and site walk
If there is a pre-bid meeting or site visit, go. Existing conditions, access, staging, and working hours drive real cost, and questions raised there often produce addenda that change everyone's price. Skipping the walk is how surprises get built into your number.
3. Take off the quantities yourself
Measure the work from the current documents rather than eyeballing it. A disciplined takeoff — counts, lengths, areas, and volumes tied to plan sheets — is the backbone of a bid you can defend and, if you win, actually build to.
4. Price labor, materials, and equipment
Build the estimate up from the takeoff: labor hours at realistic production rates and current wage rates (including prevailing wage where it applies), material costs from supplier quotes, and equipment and rental. Lock in supplier and specialty-sub numbers in writing before you rely on them.
5. Write inclusions and exclusions in plain language
State exactly what your price covers and what it does not. Clear exclusions — for example, work by others, specific materials, or conditions outside your control — prevent the most common and expensive bid disputes. If a scope item is ambiguous, clarify it in your proposal rather than silently assuming.
6. Handle addenda
Addenda change the documents you are pricing. Track every one, re-price the affected scope, and acknowledge each by number on your bid. Submitting against superseded documents is a fast way to lose a job or win one at the wrong price.
7. Apply markup and contingency deliberately
Add overhead, profit, and a contingency sized to the risk you actually see in the documents and schedule — not a reflexive percentage. Thin documents and tight timelines carry more risk and deserve more contingency, not less.
8. Submit a clean bid, on time
Late or sloppy bids get thrown out regardless of price. Use this checklist before you send:
- Base bid stated clearly. One unambiguous number for the scope as documented, with alternates and unit prices listed separately.
- Inclusions and exclusions. Exactly what your price covers and what it does not — the single best defense against a scope dispute later.
- Addenda acknowledged. Every addendum listed by number so the GC knows you priced the current documents.
- Assumptions and clarifications. Schedule, access, and coordination assumptions your number depends on.
- Validity and contacts. How long the price holds, plus a name and number for bid-day questions.
9. Follow up
After submitting, confirm the GC received your bid and offer to walk through your number. Whether you win or lose, ask where you landed — that feedback sharpens your next bid and keeps you on the bidders list.