What are construction bid sites?
Construction bid sites are any place where open projects are listed with their documents and bid dates. Contractors also call them bid boards, bid sources, construction bidding websites or plan rooms.
They fall into four types:
- Owner portals. The public owner posts its own solicitations: SAM.gov for federal work, and state, city, county and school district procurement pages.
- Plan rooms and builders exchanges. Local associations and printers that host plans for projects out to bid.
- General contractor invitation networks. Platforms GCs use to invite subcontractors and collect bids, such as BuildingConnected and PlanHub.
- Paid lead services. Companies that collect projects from many owners into one searchable database, such as Dodge Construction Network and ConstructConnect.
Public work is posted by the agency that buys it. Private work mostly reaches subcontractors through GC invitations and paid lead services.
Construction bidding websites compared
Descriptions and prices come from each platform’s own website, checked November 7, 2026. Terms change, so confirm before you subscribe.
| Site | Type | What it is for | Cost to a subcontractor |
|---|---|---|---|
| SAM.gov | Owner portal (federal) | Federal contract notices, the official governmentwide point of entry | Free |
| State, city, county and school portals | Owner portals | Each public owner’s own solicitations | Usually free to view; some use paid e-procurement hosts |
| BuildingConnected (Autodesk) | GC invitation network | Receiving, reviewing and responding to GC bid invitations | Autodesk does not publish pricing; Bid Board Pro for subs is a paid subscription |
| PlanHub | GC invitation network and marketplace | Commercial bidding marketplace for GCs, subs and suppliers | Free trial and a free-forever Basic tier for subs; paid tiers |
| Dodge Construction Network | Paid lead service | Commercial project data, early project tracking and a bid invitation dashboard | Paid; pricing by quote |
| The Blue Book Network | Directory and marketplace | Finding and being found by GCs, subs and suppliers | Free listing available; other features vary |
| ConstructConnect | Paid lead service | Public and private commercial project leads, documents and planholder lists | Starter $129 per month per market; Professional from $199 per month per market per seat, billed annually |
| BidNet Direct | Government bid aggregator | State, local and federal bid alerts | Check current plans |
Free construction bidding sites: where public work is posted
The free sources are the owners themselves. Public owners must advertise their work, so the original notice is always on their own site.
Federal: SAM.gov. FAR 5.201 requires agencies to publish notices of proposed contract actions to the governmentwide point of entry, accessed at SAM.gov. Search by NAICS code, set-aside and place of performance. Save searches for the codes you work in. You need a SAM.gov registration and a Unique Entity ID to be awarded federal work.
State agencies. Most states run a central procurement portal, and many agencies within a state also post on their own pages.
Cities, counties, school districts, transit agencies and utilities. Each posts on its purchasing page or an e-procurement host it chooses. Make a list of the owners in your area and check each bid page weekly.
State departments of transportation. Road and bridge work runs through DOT lettings, with their own prequalification rules.
Free tiers on commercial platforms. PlanHub lists a free-forever Basic tier for subcontractors, and The Blue Book offers a free listing. Check what each free tier includes before relying on it.
BuildingConnected and PlanHub: how GC invitation networks work
On private work and much public work, subcontractors bid to the general contractor, not the owner. GCs keep bid lists of trades they invite, and many send invitations through an online network.
BuildingConnected is an Autodesk product. BuildingConnected Pro is aimed at general contractors and owners for sending invitations and comparing bids. Bid Board Pro is Autodesk’s bid management product for subcontractors. It pulls invitations sent through BuildingConnected into one place and tracks deadlines. Autodesk sells it on monthly and annual subscriptions through sales. TradeTapp handles subcontractor qualification.
PlanHub describes itself as a commercial construction bidding marketplace for general contractors, subcontractors and suppliers. Subs get a free trial and a free-forever Basic tier, with paid tiers above it.
The practical point: you do not choose which network a GC uses. Register on the ones your target GCs use, keep your trade and area profile current, and answer invitations on time.
Short on time? Bidmere can do this for you. Bid and proposal packages from $1,950, ready in 5 business days. See state DOT letting bid preparation or get a fixed quote.
Dodge Construction and The Blue Book: what they are for
Dodge Construction Network calls itself North America’s leading source of commercial construction project data, market intelligence and forecasting analytics. Its products include Dodge One for spotting planned projects before bidding starts, a Bid Board for tracking bid invitations, IMS for tracking public projects earlier in procurement, and the daily Dodge Report project profiles.
The Blue Book Building & Construction Network describes itself as a digital marketplace and directory for commercial construction. It connects contractors, subcontractors, suppliers, manufacturers and service providers. It offers a free listing.
The two are related. Dodge Data & Analytics and The Blue Book announced a merger in April 2021, and Dodge now presents The Blue Book as one of its products.
Use Dodge when you want early project intelligence and you sell into many projects. Use The Blue Book when you want GCs in your region to find you.
Paid construction bid sources: ConstructConnect and others
Paid lead services collect projects from many owners and sources so you can search one place. They earn their fee when they surface private work and planholder lists you would not otherwise see.
ConstructConnect publishes three Project Intelligence plans. Starter is $129 per month per market, month to month. Professional starts at $199 per month per market per seat on an annual contract, and adds documents, planholder lists and contacts. Premium starts at $10,000 per year for multiple markets.
BidNet Direct offers government bid alerts from state, local and federal buyers, matched by category and location. It is now part of SOVRA.
Before paying, ask for a trial in your trade and area. Count how many real, biddable projects it shows that you did not already have.
How do you choose which construction bid sites to use?
Pick sources that match how your work is bought:
- Public work in your area: the owners’ own portals and SAM.gov, checked directly
- Private commercial work: get on the bid lists of the GCs you want, and register on the networks they use
- Local work: your builders exchange and plan room
- A wider net: one paid service, tested for a few months against the bids it actually produced
- Every source: filter by trade code, location and project size, so alerts stay worth reading
More listings do not mean more work. Before you price, decide whether the job fits your trade, size range and area, and whether you can meet the bonding, insurance and schedule.
Found a project? Get it priced before the bid date
Finding projects is half the job. The other half is getting accurate numbers out on time, every time, without passing on work.
Bidmere does not list projects or sell leads. Once you have the documents, send them. You get a fixed quote within 2 business hours. Single-trade estimates are priced from $195 and take 48 hours, priced at your rates. Bid packages are priced from $1,950. You pay only after you accept the price and delivery date.
Frequently asked questions
What are the free construction bidding sites?
The free sources are the owners: SAM.gov for federal notices, and state, city, county, school district and DOT procurement pages. Some commercial platforms have free tiers too. PlanHub lists a free-forever Basic tier for subcontractors and The Blue Book offers a free listing. Check what each free tier includes before relying on it.
Is BuildingConnected free for subcontractors?
Autodesk does not publish BuildingConnected pricing on its product pages, so check your account terms. Subcontractors use it to receive, review and respond to GC bid invitations. Bid Board Pro, Autodesk’s bid management product for subcontractors, is a paid monthly or annual subscription sold through Autodesk sales.
What is Dodge Construction Network?
Dodge Construction Network is a commercial construction data company. It describes itself as North America’s leading source of commercial project data, market intelligence and forecasting. Its products include Dodge One for early project leads, a Bid Board for invitations and The Blue Book directory. Pricing is by quote.
What is The Blue Book in construction?
The Blue Book Building & Construction Network is a digital marketplace and directory for commercial construction that connects contractors, subcontractors, suppliers and other providers. It offers a free listing. It merged with Dodge Data & Analytics in 2021 and is now presented as part of Dodge Construction Network.
Where are federal construction projects posted?
At SAM.gov. FAR 5.201 requires federal agencies to publish notices of proposed contract actions to the governmentwide point of entry, accessed at SAM.gov. Search by NAICS code, set-aside and place of performance, and save searches. You need a SAM.gov registration and a Unique Entity ID to receive a federal award.
How do you get on a general contractor’s bid list?
Contact the estimating department of each GC you want to work for. Send your trade, area, capacity, bonding and a short capability statement, and register on the network they use for invitations. Then bid the invitations you receive, on time and complete. Consistent, complete bids keep you on the list.
Is ConstructConnect worth paying for?
It depends on your market and trade. ConstructConnect’s Starter plan is $129 per month per market, and Professional starts at $199 per month per market per seat on an annual contract. Test it in your area and count the biddable projects you did not already have before committing.
Does Bidmere list projects to bid?
No. Bidmere prepares estimates, takeoffs and bid documents. Once you find a project, send the documents and we reply with a fixed quote within 2 business hours. Single-trade estimates are priced from $195 and take 48 hours, and you pay only after you accept.