In short
Virginia gives contractors and suppliers a powerful mechanic’s lien that relates back to the first day of work and can outrank a construction lender’s deed of trust. Virginia Mechanic’s Lien Commentary But the deadlines to perfect that lien are short and the courts enforce them strictly. The lien memorandum must be filed not later than 90 days from the last day of the month in which the lien claimant last performs labor or furnishes material, and in no event later than 90 days from the completion or termination of the work. No memorandum may include sums due for labor or materials furnished more than 150 days prior to the last day on which labor was performed or material furnished preceding the filing. However, a memorandum may include sums withheld as retainages with respect to labor performed or materials furnished at any time before it is filed (not to exceed 10 percent of the total contract price) and sums not yet due because the party with whom the lien claimant contracted has not yet received funds from the owner or another third party. Va. Code § 43-4 An owner who has already paid the general contractor in full can defeat all lower-tier liens through the defense of payment. Virginia Mechanic’s Lien Commentary Private AI data center projects are also governed by prompt payment laws that require owners to pay within 60 days of an invoice and void pay if paid clauses unless the owner is insolvent or in bankruptcy. Va. Code § 11-4.6 Public projects require payment bonds under the Virginia Little Miller Act and have their own parallel prompt payment deadlines. Va. Code §§ 2.2-4337, 2.2-4354
What mechanic’s lien rights exist on Virginia AI data center projects?
The mechanic’s lien is the core security right for anyone who furnishes labor or materials to a construction project. On an AI data center project in Virginia, the right is strong but heavily rule bound. Missing a deadline or a detail can kill the lien even if the debt is undisputed.
Who can claim a lien?
Three tiers of claimants can file a mechanic’s lien. A general contractor contracts directly with the owner. A subcontractor contracts directly with the general contractor. A subcontractor contracts with a subcontractor, who may perfect a lien under § 43-9. Virginia Code § 43-3 grants mechanic’s lien rights and § 43-4 provides the procedure for a general contractor to perfect them. Va. Code § 43-3, Va. Code § 43-4, Va. Code § 43-7, Va. Code § 43-9 Every level must hold the proper Virginia contractor license. A claimant who performs work requiring a license but does not have one, or holds the wrong license class for the value of work, shall not be entitled to a lien pursuant to this section. Va. Code § 43-3(D) There is no known limit to how far down the contract chain lien rights exist, and all claimants should file liens as long as they can trace their labor or materials to the property. Virginia Mechanic’s Lien Commentary
What work and materials are lienable?
Virginia’s statute covers any building or structure permanently annexed to the freehold. Va. Code § 43-3(A) An AI data center is a permanent structure attached to the land, so it plainly falls within the definition. The statute also lists many site improvements that are common on AI data center campuses. The list includes parking lots, retaining walls, drainage structures, underground or field constructed above ground storage tanks, water systems, and the reasonable rental or use value of equipment. Va. Code § 43-2 Specialized equipment that is permanently installed and essential to the building’s purpose, such as cooling systems, backup generators, and uninterrupted power supply units, likely qualifies under case law, though no court has applied the test specifically to AI data center gear. Va. Code Ann. § 43-3 annotated The threshold to claim a lien is low. The value of the labor or materials must reach at least $150. Va. Code § 43-3(A)
How to perfect a mechanic’s lien
A lien is not automatic. The claimant must prepare, verify, and record a memorandum of lien in the circuit court clerk’s office of the county or city where the AI data center sits. The deadline runs from the last day of the month in which the claimant last performed labor or furnished materials. The memorandum must be filed not later than 90 days from the last day of the month in which the lien claimant last performs labor or furnishes material, and in no event later than 90 days from the time such building, structure, or railroad is completed or the work thereon is otherwise terminated. Va. Code § 43-4
The memorandum must contain several specific items. It must show the names and addresses of the property owner and the claimant, the amount and consideration of the claim, the times when the amount is or will be due, the date from which interest is claimed, a verified oath, a statement of intent to claim the benefit of the lien, a brief property description, and the claimant’s Virginia contractor license or certificate number with issuance and expiration dates. A general contractor must also certify that it mailed a copy of the memorandum to the owner at the owner’s last known address. Va. Code § 43-4 A subcontractor must give notice in writing to the owner or the owner’s agent of the amount and character of his claim. Va. Code § 43-7 A lower tier subcontractor must also give the owner and the general contractor written notice of the amount and character of the claim, and its lien amount is capped at the amount the subcontractor above it could claim. Va. Code § 43-9
Minor errors may not defeat the lien. The savings provision allows a lien to survive if the property can be reasonably identified from the description, the memorandum conforms substantially to the statutory form, and the information is not willfully false. Va. Code § 43-15 The Virginia Supreme Court has confirmed that substantial compliance with the statutory form is enough. Desai v. A.R. Design Grp., Inc., 799 S.E.2d 506 (Va. 2017) But one wrong date can be fatal. A masonry contractor in Arlington County lost a $74,000 lien because the memorandum gave the last day of work as October 14 instead of October 28, making the lien facially defective. Law firm analysis
The 150 day rule and strict compliance
The lien memorandum cannot include sums due for labor or materials furnished more than 150 days before the last day on which labor was performed or material was furnished to the job preceding the filing of the memorandum. Va. Code § 43-4 This 150 day look back rule is applied strictly. Including just one dollar that falls outside the window invalidates the entire lien. The Virginia Supreme Court held in Carolina Builders Corp. that including sums for labor or materials furnished outside the 150 day look-back period required by Virginia Code § 43-4 is fatal to a mechanic’s lien. Carolina Builders Corp. v. Cenit Equity Co., 257 Va. 405, 512 S.E.2d 550 (1999)
Two exceptions matter on AI data center projects. Contractual retainage up to 10 percent of the total contract price may be included in the lien even if the retainage was withheld for work that happened more than 150 days before the last work day. Sums that are not yet due because the party with whom the claimant contracted has not yet received payment from the owner or another third party may also be included. Va. Code § 43-4 On a massive, multi year AI data center build, these exceptions can keep large unpaid balances lienable that would otherwise fall out.
Lien priority and the inchoate relationship back
Virginia’s mechanic’s lien is inchoate. That means it relates back to the moment the first visible work began on the property, not the date the memorandum is recorded. A lien that is later perfected can therefore prime, or come ahead of, a construction lender’s deed of trust that was recorded after that first day of work. Virginia Mechanic’s Lien Commentary This gives an unpaid contractor a significant advantage over a senior secured lender if the project runs into trouble and the owner defaults. It also makes a mechanic’s lien a serious threat that often forces quick settlement before a lawsuit is filed.
Enforcement deadline
Once the memorandum is recorded, the claimant must file a lawsuit to enforce the lien within six months from the recording date, or within 60 days from the time the building is completed or the work otherwise terminated, whichever occurs later. Va. Code § 43-17 There is no way to extend the perfection deadline itself, even if the enforcement window is still open. Va. Code § 43-17, Britt Constr., Inc. v. Magazzine Clean, LLC, 271 Va. 58, 623 S.E.2d 886 (2006)
How does the defense of payment rule threaten lower tier claims?
Virginia follows a rule that the owner should pay for the project only once. If the owner proves it has already paid the general contractor in full before receiving a subcontractor’s notice of mechanic’s lien, all subcontractor liens fail. The defense is an affirmative defense that the owner can raise. Virginia Mechanic’s Lien Commentary
This rule creates a real race. The owner is free to keep paying the general contractor until a subcontractor or supplier gives formal notice. The further down the payment chain a claimant sits, the greater the risk that the money will be gone before the claimant realizes there is a problem. On an AI data center campus, where draw schedules move fast and payment amounts are enormous, a sub subcontractor that waits even a few weeks before filing a memorandum may find that the owner has already disbursed the full contract balance to the general contractor. That extinguishes the lien.
Subcontractors can protect themselves by sending notice early, using the personal liability mechanism in section 43-11, or by making a claim against the general contractor’s lien under section 43-18. Under section 43-18, a subcontractor who has not perfected a lien can still attach to the general contractor’s perfected lien by giving written notice of its claim against the general contractor to the owner or his agent before the amount of such lien is actually paid off or discharged. Va. Code § 43-18
Can a subcontractor hold the owner or general contractor personally liable?
Yes. Virginia Code section 43-11 provides a two step process that allows a subcontractor or lower tier claimant to create direct personal liability on the owner or the general contractor. If followed correctly, the owner or general contractor becomes personally liable to the claimant for the actual amount due, capped at what the owner owes the general contractor at the time the second notice is given or may thereafter become indebted by virtue of the contract, or if only the general contractor was notified, capped at what the general contractor owes the subcontractor at the time the second notice is given or may thereafter become indebted by virtue of his contract with the general contractor. Va. Code § 43-11
Step one requires a preliminary written notice. It must be given to the owner or agent, or the general contractor, before the work is completed. The notice states the nature and character of the contract and the probable amount of the claim.
Step two requires a second notice. This one goes after the work is done and before 30 days have passed since the building was completed or the work terminated. It must state a correct account verified by affidavit of the actual claim and the amount due.
Both notices must either be recorded and indexed in the clerk’s office with a return that satisfies section 8.01-325, or be mailed by registered or certified mail to the person against whom liability is sought, and received by that person. The return receipt is prima facie evidence of receipt.
What are the prompt payment requirements on private AI data center projects?
Virginia’s prompt payment act for private construction, section 11-4.6, sets clear clocks and kills pay if paid clauses entirely.
Owner to general contractor
The owner must pay the general contractor within 60 days of receiving an invoice after satisfactory completion of the invoiced work. If the owner intends to withhold payment for noncompliance with the contract, it must give the general contractor written notice within 45 days of receiving the invoice. The notice must identify the specific contractual noncompliance and the dollar amount being withheld. Va. Code § 11-4.6(B)(1)
General contractor to subcontractor
The general contractor must pay a subcontractor within the earlier of two dates. The first is 60 days after receipt of the subcontractor’s invoice after satisfactory completion. The second is seven days after the general contractor receives payment from the owner for the subcontractor’s work. If the general contractor intends to withhold payment, it must notify the subcontractor in writing within 50 days of receiving the invoice, stating the basis for withholding, the dollar amount, and the subcontractor responsible. Va. Code § 11-4.6(B)(2)
Downstream flow
These prompt payment duties flow down to subcontracts between a subcontractor and a lower tier subcontractor or supplier, but only if the project is not a single family residential project and the value of the project or aggregate of projects under one contract exceeds $500,000. Va. Code § 11-4.6(B)(2) Every AI data center project in Virginia far surpasses that number, so the flow down applies.
No pay if paid clauses
A clause that makes payment by the party above a condition precedent to paying a lower tier subcontractor is unenforceable. The general contractor must pay within the statutory time regardless of whether it has received payment from the owner. The sole exception is when the party above is insolvent or a debtor in bankruptcy as defined in § 50-73.79. Va. Code § 11-4.6(B)
Interest
The Virginia prompt payment statute for private construction, § 11-4.6, does not contain a statutory interest rate. Any interest on late private project payments would be determined by the contract or by Virginia’s general interest law.
A gray spot
The statute does not define the term satisfactory completion. That leaves open exactly when the 60 day clock starts to run. Satisfactory completion is not defined in Virginia’s prompt payment statutes, which can lead to disputes over when an invoice is properly due. Prompt payment analysis
| Paying party | Receiving party | Payment deadline | Withholding notice deadline |
|---|---|---|---|
| Owner | General contractor | 60 days after invoice | 45 days after invoice |
| General contractor | Subcontractor | Earlier of 60 days after invoice or 7 days after receipt from owner | 50 days after invoice |
| Subcontractor to lower tiers (project > $500k) | Same deadlines flow down | Same | Same |
How do prompt payment rules apply to public AI data center projects?
When the AI data center is owned by a state agency or local government, the Virginia Public Procurement Act governs prompt payment. State agencies must pay the general contractor by the payment date established in the contract or, if the contract does not establish a payment date, by the later of 30 days after receiving a proper invoice or 30 days after the agency receives the goods or services. Local governments have 45 days instead of 30. Va. Code § 2.2-4352, Va. Code § 2.2-4347
The prime contractor in turn must pay each subcontractor within 60 days of receiving a satisfactory invoice, even if the public body has not yet paid the contractor. Pay if paid clauses are unenforceable in construction contracts under the Virginia Public Procurement Act. Va. Code § 2.2-4354 The contractor must also notify any subcontractor of intent to withhold within 50 days of receiving the invoice, and must pay the subcontractor its proportionate share within seven days of receiving payment from the public body, or else notify the agency and the subcontractor of the withholding. Late payments accrue interest at 1 percent per month beginning seven days after the contractor receives payment from the public body. Retainage provisions are not affected by these prompt payment rules.
What payment bond rights are available under the Virginia Little Miller Act?
On any nontransportation-related public construction contract exceeding $500,000 awarded to any prime contractor, the contractor must furnish both performance and payment bonds to the public body. For transportation-related projects authorized under Article 2 of Chapter 2 of Title 33.2 and partially or wholly funded by the Commonwealth, the threshold drops to $350,000. Va. Code § 2.2-4337(A)
The payment bond protects two groups. First tier subcontractors, those who contract directly with the prime contractor, do not need to give any notice before suing on the bond. Second tier claimants, those who supply labor or materials to a subcontractor, must give written notice to the prime contractor within 90 days after their last day of work. The notice must state with substantial accuracy the amount claimed and the name of the person for whom the work was performed. Va. Code § 2.2-4341 A Virginia circuit court has held that the notice must be actually received by the general contractor within the 90 days, not simply mailed. R.T. Atkinson Building Corp. v. Archer Western Const.
The lawsuit on the payment bond must be filed more than 90 days after the claimant’s last day of providing labor or materials, but within one year of that last day. Va. Code § 2.2-4341 Retainage is excepted from the 90 day notice requirement. Under Virginia law, a subcontractor, lower-tier subcontractor, or material supplier cannot waive payment bond rights in a contract signed before any labor, services, or materials are furnished. Performance bond commentary
Suppliers to second tier subcontractors, third tier and below, are likely not protected, though the statutory text that covers persons supplying labor or materials to any subcontractor could be read more broadly. Suppliers to suppliers are likely not covered under the Virginia Little Miller Act. Bond claim guide
What criminal liability exists for misusing construction funds?
Virginia imposes criminal larceny liability on any contractor, subcontractor, or their officers, directors, or employees who, with intent to defraud, retain or use funds paid by the owner, contractor, or lender for any purpose other than paying persons who supplied labor or materials to the project. Using money paid under the contract for any other purpose before paying all amounts due or to become due is prima facie evidence of intent to defraud. Va. Code § 43-13 There is also a civil cause of action for a party in contract with the wrongdoer. Any contract clause that lets a party withhold funds due under one contract because of a claim on another contract is void as against public policy.
On an AI data center project, where the general contractor may be moving large sums through multiple subs and suppliers, this statute is a powerful deterrent against the deliberate diversion of progress payments. A subcontractor that is not being paid can point to these provisions in a demand letter before resorting to a lien.
How do zoning disputes and project stoppages affect lien and payment rights?
Virginia’s AI data center boom has attracted intense local opposition. In Loudoun County, the board ended by right data center approvals in March 2025, requiring a special exception for every new project. Market analysis A Prince William County judge voided the $24.7 billion PW Digital Gateway rezoning on procedural grounds, blocking two campuses totaling about 1.7 GW. NBC4 Washington, Law firm analysis, Cleanview In King George County, a newly elected board rescinded Amazon’s approved performance agreement for the Birchwood campus, prompting a vested rights lawsuit. GovTech
When a rezoning is struck down or a permit is revoked, construction work may stop abruptly. That stoppage counts as a termination of work under section 43-4, which starts the 90 day clock for filing a memorandum of lien and triggers the completion measurement for the enforcement deadline. Contractors who were mid project and have not been paid in full must immediately protect their rights. The termination also triggers the 30 day post work notice window for personal liability under section 43-11. On a site where the developer is fighting a legal battle and the future of the project is uncertain, the mechanic’s lien priority and the threat of personal liability are often the only advantage an unpaid contractor has.
No publicly reported Virginia mechanic’s lien enforcement action specifically naming an AI data center project has been identified. That silence may reflect the prevalence of payment bonds on large commercial projects, the strength of the relationships between sophisticated owners and general contractors, and the tendency of these disputes to settle before public litigation given the power of the inchoate Virginia lien. But as local governments push back and more projects face sudden stop work orders, the risk of a high profile payment failure rises.
Key takeaways
- Know your license status. A contractor without the proper Virginia license has no lien rights and cannot pass lien rights down the chain.
- Track the 150 day look back precisely. Include only labor and materials furnished within the 150 days before the last work day. One dollar outside that window kills the entire lien.
- File early. The 90 day filing window starts from the last day of the month in which work stopped, not from when the payment dispute became clear. Waiting too long to prepare the memorandum risks losing the lien.
- Understand the defense of payment. Lower tier subcontractors and suppliers should give notice of a claim as soon as a payment problem appears, because the owner can keep paying the general contractor until notice arrives.
- Use section 43-11 for personal liability. The two step notice process can give a subcontractor a preferred claim directly against the owner or general contractor, bypassing the defense of payment.
- Demand prompt payment. On private projects, owners must pay within 60 days and pay if paid clauses are void. Private projects carry no statutory interest rate, so the contract or Virginia’s general interest law governs. The 1 percent per month statutory rate applies only to public projects.
- Secure bond rights on public projects. Second tier claimants must give written notice to the prime contractor within 90 days and the notice must actually be received. File suit after 90 days but before one year from the last day of work.
- Monitor zoning risk. A sudden project stoppage triggers lien and personal liability deadlines immediately. Contractors who wait for the developer to resolve a zoning fight may find their lien window has closed.
Frequently asked questions
Q:What is the deadline to file a mechanic’s lien memorandum in Virginia?
A:The memorandum must be filed not later than 90 days from the last day of the month in which the claimant last performs labor or furnishes material, and in no event later than 90 days from the time such building, structure, or railroad is completed, or the work thereon otherwise terminated. Va. Code § 43-4
Q:Can an unlicensed contractor file a mechanic’s lien?
A:No. A person who performs work that requires a Virginia contractor license but does not have one, or holds the wrong license class for the value of work, is not entitled to a lien. Va. Code § 43-3(D)
Q:Does the 150 day rule apply to retainage?
A:Not entirely. Retainage withheld at any time up to 10 percent of the total contract price can be included in the lien memorandum even if the work it relates to was performed more than 150 days before the last work day. Sums not yet due because the upstream party has not been paid by the owner can also be included. Va. Code § 43-4
Q:Can a subcontractor waive lien rights in advance?
A:No. A provision in a contract signed before any labor, services, or materials are furnished that waives or diminishes a general contractor’s, subcontractor’s, lower-tier subcontractor’s, or material supplier’s lien rights is void. A waiver signed after work has begun may be enforceable. Va. Code § 43-3(C)
Q:What happens if the owner already paid the general contractor before I filed my subcontractor lien?
A:The defense of payment can defeat your lien. If the owner can prove it paid the general contractor in full before it received notice of your lien, all subcontractor liens fail. Notify the owner early. Virginia Mechanic’s Lien Commentary
Q:Is an AI data center considered a building or structure for lien purposes?
A:Almost certainly yes. The statute covers any building or structure permanently annexed to the freehold. An AI data center is a permanent structure attached to land. No Virginia appellate case has specifically confirmed this in the data center context, but the text comfortably fits. Va. Code § 43-3(A)
Q:Does the Virginia Little Miller Act protect a supplier to a subcontractor’s supplier?
A:Probably not. The statute explicitly protects persons who have direct contracts with the prime contractor and persons who supply labor or materials to a subcontractor. Parties more removed than a second-tier subcontractor, such as suppliers to a sub-subcontractor, are not eligible to make a bond claim under Virginia’s Little Miller Act. Bond claim guide, Va. Code § 2.2-4341, Bond claim guide
Q:What is the interest rate on a late payment under Virginia prompt payment law?
A:The statutory rate is 1 percent per month unless the construction contract provides a different rate. Va. Code § 2.2-4354(5)
Q:When does the 30 day personal liability notice window under section 43-11 start?
A:It starts when the building or structure is completed or the work is otherwise terminated. The second notice must be given after the claimant finishes work or furnishes material but within 30 days after the building is completed or the work is otherwise terminated. Va. Code § 43-11
Q:Must the mechanic’s lien memorandum use the statutory form?
A:No. The statute provides a form, but use of the form is not mandatory. Substantial compliance is required. Va. Code § 43-5 No inaccuracy in the memorandum or property description will invalidate the lien if the property can be reasonably identified from the description, the memorandum substantially complies with §§ 43-5, 43-8 and 43-10, and the memorandum is not willfully false. Va. Code § 43-15
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Junde Liu, JD, LL.M. (Taxation) candidate at UF Law. Originally published on Compute Law Blog. This article is general information and does not constitute legal advice. Reading it does not create an attorney client relationship. The reader should not act on the basis of any content here without first consulting a licensed attorney in the relevant state. Last reviewed for accuracy May 23, 2026.