How to Get, Level, and Award Subcontractor Bids

A reliable subcontractor bid process has six steps: build a bid package for each trade, send a clear invitation to bid (ITB) with enough lead time, follow up to confirm who is bidding, manage addenda so every bidder prices the same scope, level the bids by normalizing inclusions and exclusions, and award in writing and tell the bidders who did not get the job. Most bid-day problems, like a missed addendum or a scope gap between two trades, trace back to skipping one of those steps rather than to bad estimating.

This matters most for small general contractors, where the owner or a project manager usually runs bids alongside everything else. There is no preconstruction department to catch a missing exclusion at 1:45 PM on bid day. A repeatable process is what lets a small team bid competitively without leaving money on the table.

Below is each step in practical detail, including a sample ITB, a worked bid leveling example, a checklist of scope that commonly falls between trades, and what subcontractors look at when they decide whether to bid your job at all.

Step 1: Build a Bid Package for Each Trade

Subcontractors price what you show them. A bid package that clearly defines the scope gets bids you can compare; a bid package that says "per plans and specs" gets bids with different assumptions.

Each trade package should include:

Scope sheet. What is included, what is excluded, and which related items belong to another trade. This is the single most useful document for leveling later.
Drawings and spec sections. List the specific sheets and spec sections that apply, plus the general requirements (Division 01) that apply to everyone.
Bid form. A standard form asking for base bid, alternates, unit prices, allowances, and acknowledgment of each addendum by number. A standard form makes bids comparable.
Schedule. Anticipated start, duration, and any phasing or milestone constraints.
Site logistics. Access, hours, parking, laydown, hoisting, and whether the site is occupied.
Commercial terms. Insurance and bonding requirements, retainage, payment terms, and any prevailing wage or participation requirements on public work.

Step 2: Write an Invitation to Bid Subs Will Actually Read

Subcontractors receive more invitations than they can price, so they triage. An ITB that answers their first questions in the first few lines is more likely to get a bid.

A complete ITB includes the project name and location, owner and architect, trade and scope summary, bid due date, time, and delivery method, where to get documents, pre-bid meeting or site walk date, deadline for questions and who to send them to, bonding and insurance requirements, and anticipated start date.

Here is a sample you can adapt:

Subject: ITB: Electrical, Riverside Medical Office TI, bids due Thu 10/22 at 2:00 PM

We are bidding the Riverside Medical Office tenant improvement (8,200 SF, second floor, occupied building) for [Owner], designed by [Architect]. We invite you to bid the electrical scope as described in the attached scope sheet.

Bids due: Thursday 10/22 at 2:00 PM, by email, on the attached bid form.
Documents: [link]. Drawings E-001 through E-401, specs Division 26 and Division 01.
Site walk: Tuesday 10/13 at 9:00 AM.
Questions: by Friday 10/16 to [name, email]. Answers will be issued to all bidders by addendum.
Requirements: Payment and performance bond not required. Insurance per attached exhibit.
Anticipated start: early December, 10-week duration.

Please reply by 10/15 to let us know whether you plan to bid.

The last line matters. Asking for an intent-to-bid reply early tells you where your coverage is thin while you still have time to fix it.

Step 3: Build Coverage and Follow Up

Invite more subs than you need. Not everyone invited will bid. For major trades, keep a broad list of qualified subcontractors and invite enough of them that you can still get competitive coverage after the no-bids. A common rule of thumb is to aim for at least three bids on each major trade.

Pre-qualify before bid day. Confirm insurance, bonding capacity, relevant experience, safety record, and current workload before a sub goes on your invitation list. On bid day, you do not want to discover your low electrician cannot get bonded.

Follow up on a schedule. Send invitations with enough lead time for subs to price the work; for many small commercial projects, about two weeks is a reasonable target. Follow up around the one-week mark to confirm intent and answer questions, and again a few days before bid day to confirm they have every addendum.

Grow your list. Ask suppliers who they sell to, pay attention to subs doing good work on nearby projects, and attend local contractor association events. A deeper list is what saves you when your usual subs are busy.

Step 4: Manage Questions and Addenda

Answer questions to everyone. When one bidder asks a question that affects scope or price, issue the answer to all bidders by addendum. Answering only the person who asked creates unequal bids and fairness complaints.

Log every addendum. Keep a list of addenda by number and date, what each one changed, and which trades it affects. Addenda often arrive from the architect days before bid day.

Confirm acknowledgment. Make sure every bidder has received each addendum, and require them to list addenda by number on the bid form. On bid day, a bid that does not acknowledge the latest addendum needs a phone call before you use it.

Step 5: Level the Bids

Bid leveling means adjusting each bid so you are comparing the same scope. The low number is only the low bid if it includes everything the others do.

Here is an illustrative example with three electrical bids. The numbers are made up to show the method.

	Bid A	Bid B	Bid C
Base bid as submitted	$182,000	$196,500	$175,000
Fire alarm	Excluded	Included	Included
Temporary power	Included	Included	Excluded
Permit fees	Included	Included	Excluded
Addenda acknowledged	1, 2, 3	1, 2, 3	1, 2

To level, add a plug number for each excluded item from your own estimate or from another bidder's breakdown, and resolve anything unclear by calling the bidder.

	Bid A	Bid B	Bid C
Base bid	$182,000	$196,500	$175,000
Add fire alarm (plug)	$14,000
Add temporary power (plug)			$6,500
Add permit fees (plug)			$2,800
Addendum 3 impact (confirm with bidder)			TBD
Leveled total	$196,000	$196,500	$184,300 + Add. 3

The apparent $21,500 spread between the high and low bids shrinks once the exclusions are priced, and Bid C cannot be used until the bidder confirms what Addendum 3 does to their number. That call, not the lowest line on the page, is what protects your estimate.

Scope That Commonly Falls Between Trades

When leveling, check who carries these items. They are frequent sources of post-award surprises:

Blocking and backing for casework, accessories, and wall-mounted equipment
Firestopping at penetrations (each trade, or one firestopping sub?)
Core drilling and sleeves
Cutting and patching after rough-in
Temporary power, lighting, and heat
Hoisting and crane time
Cleanup and dumpsters
Permits and inspection fees
Equipment connections (who sets it, who wires it, who pipes it)
Low-voltage rough-in versus cabling
Concrete housekeeping pads for equipment

Step 6: Award and Close the Loop

Hold a scope review before you sign. Walk the scope sheet with the apparent low bidder, confirm every exclusion and assumption, and write the results into the subcontract. This is the cheapest time to find a misunderstanding.

Award in writing. Issue a letter of intent or subcontract promptly so the sub can schedule crews and order long-lead material.

Tell the others. Let unsuccessful bidders know the job was awarded, and if you are comfortable doing so, whether they were competitive. Subs who never hear back stop bidding your work.

Record results. Note who was invited, who bid, who was competitive, and who you used. Over time this tells you which subs to invite and which ones accept invitations but never submit a price.

What Subcontractors Look At Before They Bid Your Job

Every subcontractor makes a bid/no-bid decision on each invitation. Understanding it helps GCs get better coverage, and it is a useful checklist for subs deciding where to spend estimating time.

The GC's reputation. Does this GC pay on time? Do they run organized jobs? Do they shop bids after award? Subcontractors talk, and a reputation for slow payment reduces bid coverage faster than anything else.

Document quality and time to price. A complete package with a reasonable deadline is easier to say yes to than a link and "need pricing by Thursday."

Chances of winning. How many other GCs and subs are bidding? Is the project likely to proceed, or is it a budget exercise? Is this GC likely to win the prime contract?

Fit with backlog. Does the schedule line up with crew availability? Is the job the right size and type?

Commercial terms. Retainage, payment terms, bonding, insurance requirements, and any onerous subcontract language all factor in.

Feedback. Subs keep bidding for GCs who tell them the outcome.

If you are a subcontractor, a few habits improve your own results: keep a standard list of qualifications and exclusions you attach to every bid, confirm you have every addendum before submitting, send questions before the question deadline, and track which GCs actually award work to you so you can focus estimating time where it pays.

Common Bidding Mistakes

Sending invitations too late for subs to price the work properly
Scope sheets that say "per plans and specs" instead of listing inclusions and exclusions
Answering one bidder's question without issuing an addendum to everyone
Plugging a low number into the estimate without leveling it
Awarding without a scope review, then discovering exclusions after the subcontract is signed
Never telling unsuccessful bidders the outcome

Frequently Asked Questions

How many subcontractor bids should I get per trade?
A common rule of thumb is at least three for major trades, so you can judge whether a price is reasonable. To end up with three, you usually need to invite more, since some subs will decline or not submit.

What is the difference between an ITB, an RFP, and an RFQ?
Terminology varies by region and owner, but generally an invitation to bid (ITB) asks for a price on a defined scope, a request for proposal (RFP) asks for a proposal that may include approach, qualifications, and price, and a request for qualifications (RFQ) asks for qualifications only, often to build a shortlist.

How far in advance should I send invitations to bid?
Long enough for subs to review documents, attend a site walk, ask questions, and get supplier pricing. For many small commercial projects, around two weeks is a reasonable target; larger or more complex scopes need more.

What is bid leveling?
Adjusting subcontractor bids so they cover the same scope before comparing them. You add the cost of items a bidder excluded, confirm addenda were included, and clarify assumptions, so the comparison reflects real cost rather than different scope.

Should I share bid results with subcontractors?
At minimum, tell unsuccessful bidders that the project was awarded. Many GCs also tell subs whether they were competitive without revealing other bidders' numbers. Sharing competitors' pricing damages trust and is a practice good subcontractors avoid.

Running Bids in One Place

The process above works with email and spreadsheets on a small number of bids. As the number of trades and bidders grows, the hard parts are knowing who has received which addendum and keeping the bid comparison tied to what was actually sent.

AECify's construction bidding software lets you create bid packages with scope documents, invite subcontractors from your address book with a tracked link, distribute addenda to every invited bidder, compare bids side by side, and keep the full trail from invitation to award. Once a sub is awarded, changes during construction follow a different process; see our guide on how to price and document a change order.