If you're a trade contractor looking for commercial work, bid sites are the obvious place to start. They're where general contractors post invitations to bid, and where public agencies post projects they're required to advertise.
They're worth using. But they solve only the first half of the problem. A bid site gets you invited. It doesn't get you awarded. On most projects, dozens of subs see the same invitation, and the one who wins usually isn't the one who found it first or priced it lowest.
This guide covers the main bid sites for subcontractors, private and public, which ones to start with, and what to do after you find a project so you're not just another number on the bid tab.
Want every bid site in one place? The WORKMN Bid Hub lists 68 bid sources, including all 50 state procurement portals, for a one-time $13.
Private bid sites: where general contractors invite subs
On private work, the general contractor runs the bid. Most GCs manage their sub invitations through one of a few platforms, so being set up on them, with your trades, service area and contact details complete, decides whether you get invited at all.
BuildingConnected. Owned by Autodesk and widely used by GCs to send invitations to bid and collect sub proposals. Subs can create a profile and respond to invitations at no cost; paid upgrades add tools for finding projects you weren't invited to. If GCs in your area use it, a complete profile here is the minimum.
PlanHub. A bidding network where GCs post projects and subs search for work by trade and location. There's a free way in for subcontractors and paid plans with more project visibility.
ConstructConnect. A paid project-lead database covering public and private projects, with plans, specs and bidder lists. It's useful when you want to see projects early and know which GCs are bidding them.
Dodge Construction Network. A paid source of project intelligence, strongest on tracking projects from early planning through bidding. It's more of a research tool than an invitation inbox.
How to use them well: pick your trades and radius carefully so the invitations you get are ones you'd actually bid, keep your profile current, and respond to every invitation, even with a no-bid. GCs notice who answers.
Public and government bids: free, but scattered
Public agencies generally have to advertise their projects, so government work is the one place where finding opportunities is usually free. The catch is that it's spread across many sites.
SAM.gov. The federal government's official site for contract opportunities. Searching is free. Bidding on federal work as a prime requires registration, but subs can also use it to see which primes are bidding and reach out to them.
State procurement portals. Every state publishes solicitations for its agencies, universities and facilities. Search "[your state] procurement bids" to find yours.
State DOT letting pages. Highway, bridge, paving and drainage work, posted on a published schedule.
City, county and school district bid boards. Local facility, roofing, HVAC, parks and utility work. Many use a shared bid-notification service, and signing up for alerts is usually free.
Builders exchanges and plan rooms. Regional organizations that collect public and private projects and plans in one place. Some access is free; many charge a membership.
How to use them well: set saved searches or email alerts for your trade codes and counties, and check the bid documents for prequalification, bonding and pre-bid meeting requirements before you spend time on a takeoff. On public work, a missed mandatory pre-bid meeting can disqualify you before price ever comes up.
Which bid sites to start with
Mostly private commercial work through GCs: start with complete, current BuildingConnected and PlanHub profiles. Add a paid lead service once you know which GCs you want to follow.
Mostly public work (schools, cities, counties): start with your state procurement portal and local bid boards, with alerts on. Add SAM.gov if federal facilities are in your area.
A mix, in one region: start with your local builders exchange or plan room. Add ConstructConnect or Dodge for early project tracking.
Very little bidding today: start with one private platform and one public portal. Add nothing else until you have a routine for following up.
The last one matters most. More bid sites means more invitations, and more invitations without a follow-up routine just means more bids that disappear.
Skip the hunting. The WORKMN Bid Hub puts every construction bid site in one place: federal, all 50 state portals and DC, local government bid networks and GC bid lists, with what each costs and which to join first. Get the Bid Hub for $13.
Why finding bids isn't the same as winning them
Contractors lose commercial work on price, on timing, and because they never heard about the project. But the biggest reason is simpler: someone else had a contact on the inside who trusted them enough to negotiate with them first.
Even on a hard bid through a GC, there is always a buying process. Someone levels the numbers. Someone decides whether your scope matches the others. Someone picks up the phone to ask the low bidder a question, or doesn't. The question on every bid is the same: how do I set myself apart, or am I just trying to be the low number?
Three habits change the answer:
Know who actually decides. The estimator who sent the invitation is rarely the only decision-maker. The project manager, the owner's rep and procurement often weigh in. The contact you're closest to may not hold the keys, and sometimes they're guarding the door.
Make your number easy to level. Clear inclusions and exclusions, alternates priced separately, and no surprises in the scope. A number the GC can compare quickly gets a call; a confusing one gets skipped.
Follow up with a reason. "Just checking in" doesn't help anyone. A scope clarification, a value-engineering option or a schedule question gives the GC a reason to talk to you before the award.
Not sure who really decides on your next bid? Get the free Champion Check. It's a one-page sheet that maps the buying group on one live job, so you know who to talk to before you price it.
And keep selling while you're busy. Most owner-led contractors bid hard when work is slow and stop when the crews are full, which is exactly why revenue rises and falls.
Tools to win the bids you find
Win the Bid Toolkit ($29). For hard bids when you don't want to be just the low number: winning before you price, a number that's easy to level, 10 follow-up emails with a reason behind each, plus a bid record, scope check and revision control. Get it now
Pipeline & Backlog Tracker ($39). One Excel workbook for every bid you find: stage, value, next action and several contacts per deal, plus 18 months of booked work and a dashboard that shows your first dip month. Get it now
Or get all six tools in the WORKMN Steady Revenue System.
Want qualified opportunities brought to you instead? WORKMN connects commercial trade contractors with real needs, decision process included. Join the WORKMN network.