The 7 Documents Every Construction Project Needs Before Day 1

Most construction projects start with a handshake and a price. Half of those end with a dispute, a lien, or both.

The seven documents below take maybe 90 minutes total to prepare and review. They are the cheapest insurance policy in construction. Skip any of them at your own risk.

1. Signed Scope of Work (line-itemized)

This is the document that 80% of construction disputes trace back to. Generic descriptions ("paint kitchen") cost real money. The scope must specify:

• What is being done, room by room and surface by surface
• What materials are being used (brand, model, finish, grade)
• What prep work is included (patching, sanding, priming, masking)
• What is explicitly excluded (the exclusions list prevents most fights)
• Who furnishes what (contractor-supplied vs. owner-supplied)

Read our deep-dive on why a bad scope causes 80% of construction disputes.

2. Fixed-Price or Time-and-Materials Contract (with change-order clause)

The contract is the master agreement. It references the scope, sets the total price (or hourly rate), and most importantly defines how changes get handled.

Required clauses:

• Payment schedule tied to milestones (not arbitrary dates)
• Change-order procedure — written, signed, dated, with hourly or unit pricing
• Termination provisions for both parties
• Dispute-resolution clause (mediation before litigation is cheaper for everyone)
• Warranty terms for workmanship and materials

3. Proof of License (verified against state board)

A license number printed on a business card is not proof. Pull the actual record from your state's contractor license board. Verify:

• Active status (not expired or suspended)
• Classification matches the work being done
• No open disciplinary actions
• License-holder name matches the contract signer

This takes 30 seconds. Skipping it is how unlicensed handymen end up doing licensed work, and how customers end up with no legal recourse.

4. Certificate of Insurance (named insured matches contract)

Get a current Certificate of Insurance (COI) directly from the contractor's insurer — not a photocopy. Verify:

• General liability coverage with limits appropriate to the project size (typically $1M minimum)
• Workers' compensation if the contractor has employees on your jobsite
• Effective dates covering the entire project duration
• Named insured matches the entity in your contract
• Additional insured endorsement listing you (the property owner) when possible

5. W-9 (for 1099 reporting)

If you pay an unincorporated contractor more than $600 in a year, the IRS requires you to file a 1099-NEC. To do that, you need their W-9 on file.

Get it before the first payment, not after. Chasing W-9s in January is one of the most reliably miserable experiences in real estate.

6. Conditional Lien Waiver (signed at each milestone)

This is the most overlooked document on the list, and the most consequential.

A mechanic's lien lets unpaid contractors and suppliers attach a claim to your property. Conditional lien waivers, signed by the contractor and their key subs at each milestone payment, prevent this from happening retroactively.

Two types you need to understand:

• Conditional waiver upon progress payment — signed at each milestone, valid only when the payment clears
• Unconditional waiver upon final payment — signed at closeout, valid immediately

Without these, a sub the GC failed to pay can lien your property even if you paid the GC in full.

7. Final Unconditional Lien Waiver (signed at closeout)

The closing document. Signed by the GC and any subs/suppliers who delivered work or materials. Releases all claims against the property.

Without this, your "completed" project is not actually complete. It is just paused.

The good news

If you are using Bidroom, all seven of these documents are auto-generated, signed in-app, and tracked through the lifecycle of your project. The contract is built from your scope. License and insurance are pre-verified. Lien waivers are issued with each milestone release. The W-9 is collected at onboarding.

You do not have to think about any of this. You just have to know it is happening.

The bad news

If you are not using Bidroom — or any platform with this kind of compliance built in — you are responsible for all seven documents yourself. The cost of skipping any one of them is dramatically higher than the cost of preparing it.

Do the paperwork. Save the project.