Massachusetts Real Estate Law · Construction Law

What Every Contractor, Subcontractor, and Property Owner Needs to Know About Massachusetts Mechanic’s Liens

If you’ve done work on a property and haven’t been paid — or if you own a property and just received a lien notice — the rules in Massachusetts are strict, specific, and not forgiving of mistakes.

By a Massachusetts Real Estate & Construction Law AttorneyMarch 2025Real Estate & Construction

I get calls about mechanic’s liens fairly regularly — and those calls come from both sides of the dispute. Sometimes it’s a contractor who hasn’t been paid after completing a significant renovation project and wants to know whether the law can help. Other times it’s a property owner who has received a lien notice and wants to understand exactly what it means and what options are available. In either case, there is a lot to understand, and the margin for error is slim.

What I want to do in this article is walk you through the fundamentals of Massachusetts mechanic’s lien law in plain language, so you can have a working understanding of what these liens are, who can use them, what types of work and charges they cover, and — critically — where the law draws the line on what property can be reached. This is not a short subject, but getting the basics right will put you in a far better position to protect your interests.

What Is a Mechanic’s Lien, Exactly?

A mechanic’s lien is a statutory lien — meaning it is created by statute, not by contract or common law — that attaches to real property. It exists to protect contractors, subcontractors, and suppliers of materials who have contributed labor or materials to the improvement of someone else’s property but have not been paid for that work. Once properly established, it gives the lienholder the right to foreclose on the property and force a sale if necessary to recover the amount owed. Like any other lien, depending on where it stands in the order of priority and how much equity the property has, the lienholder may ultimately recover from the sale proceeds.

Because it is entirely a statutory creation, the courts interpret it strictly. What that means in practice is that if you do not follow the procedural requirements to the letter, the lien will be deemed invalid. There are no equitable exceptions here. Courts across Massachusetts — and in virtually every other state — have consistently held that strict adherence to the statute’s requirements is non-negotiable. The practical implication is important: you cannot rely on intuition or general fairness arguments. You have to follow the rules exactly as written.

I want to flag something else worth knowing: although virtually every state has some version of a mechanic’s lien law, they are remarkably different from one another. Even among the New England states, the differences are significant. If you are doing work in Massachusetts, Massachusetts law applies — and the specifics of this statute will generally not transfer to work you do in other states.

Who Is Protected Under Massachusetts Law?

The statute covers a broad range of people and businesses that furnish labor or materials in connection with the erection, alteration, repair, or removal of a building or structure, or any improvement or alteration to real property. That includes general contractors, subcontractors, and material suppliers — but it also extends to contractors engaged in landscaping, parking lot paving and striping, environmental remediation, and land clearing. In short, if your work improved real property, there is a good chance you fall within the statute’s protection.

Design Professionals Now Have Lien Rights Too

One development worth highlighting is the 2011 expansion of lien rights to design professionals. Before that change, architects, engineers, and surveyors did not have access to mechanic’s lien protection in Massachusetts. Today, architects, landscape architects, professional engineers, licensed site professionals, and land surveyors who are licensed or registered in Massachusetts may assert lien rights, provided they comply with the applicable provisions of the statute.

The law created a structure for design professionals that mirrors the general contractor/subcontractor distinction in the construction context — meaning that a design professional’s relationship to the property owner or the prime contractor determines which specific statutory requirements apply to them. It is important to understand which category you fall into before you proceed.

Who Can File a Massachusetts Mechanic’s Lien

• General contractors with a direct contract with the property owner
• Subcontractors engaged by the general contractor
• Suppliers of materials, appliances, tools, or rental equipment
• Licensed design professionals (architects, engineers, land surveyors, etc.)
• Contractors performing landscaping, paving, environmental remediation, and site clearing

What Types of Charges Can Be Liened?

Under prior versions of Massachusetts law, there was frequent litigation over whether particular types of charges were “lienable.” Defense attorneys routinely argued that mechanic’s liens could only attach to “labor and materials” in the strict sense — and they were often successful in excluding things like overhead, general conditions costs, rental charges, and appliances from the lien amount. That created real problems for contractors who had legitimate claims but found parts of their invoices stripped away because of how the statute was worded.

The current statute significantly broadens what can be liened. For general contractors, the lien attaches for all construction management and general contractor services, as well as material, rental equipment, appliances, and tools furnished pursuant to the contract with the owner. The old narrow interpretation is no longer available as a defense in most circumstances. For subcontractors, G.L. c. 254, § 4 contains similar provisions. For design professionals, the lien may encompass all amounts due or to become due under the design contract — a notably broad formulation.

In practice, this means that if you have a written contract and you have performed work or furnished materials covered by that contract, you have a much stronger basis for a complete lien claim than contractors did under the old law. That said, the procedural requirements — the notices, the timing, the filings — remain exactly as demanding as they always have been.

What Property Can a Mechanic’s Lien Reach?

This is where things get genuinely interesting, and where property owners and contractors alike often have significant misconceptions. The lien attaches to the interest in real property held by the party who entered into the contract giving rise to the lien. Understanding that sentence — and its limits — is essential.

The General Rule: Lien Follows the Contracting Party’s Interest

The law makes clear that the lien attaches to the interest in real property of the owner who contracts — or of any person acting for, on behalf of, or with the consent of such an owner. That is a broad formulation and it is intentionally so.

Consider a practical example that comes up regularly: a contractor is hired to build out tenant space in a commercial lease — what the industry calls “tenant fit-out” work. The tenant holds a leasehold interest in the property, not the fee interest. In that scenario, the contractor’s lien attaches to the leasehold — the tenant’s interest — not to the underlying real estate owned by the landlord. The landlord’s interest is generally protected, as long as the work was not done pursuant to a contract with the landlord directly or with someone acting with the landlord’s authorization.

Similarly, a contractor working for the holder of air rights has a lien claim against whatever interest that party holds, even if the land beneath is owned by a completely different entity.

When the Fee Owner Can Be Reached

There is an important exception to the general rule that the landlord is protected when work is done for a tenant. In a decision worth understanding, the Supreme Judicial Court held that a general contractor’s mechanic’s lien can attach to the fee interest of a property owner who consents to a lessee contracting for work on the property. This significantly expands potential exposure for property owners who allow their tenants to engage contractors — even if the property owner did not sign the contract.

If you own real property and a tenant is planning construction or renovation work, how you respond to — and document — your position on that work may determine whether your own interest in the property is exposed to a mechanic’s lien.

It is also worth noting that this expanded reach does not automatically extend to subcontractors. The case law has drawn a distinction between the general contractor and subcontractors in this context — subcontractors generally do not have the same ability to reach the fee owner’s interest in situations where the contracting party is a tenant. That asymmetry matters if you are a subcontractor trying to assess the practical value of any lien you might file.

Two Important Exceptions: Landlords and Public Property

The statute contains two important carve-outs that every contractor should understand before relying on a lien claim.

First, a contractor doing work for a tenant does not automatically have rights against the landlord. Unless the work was done pursuant to a contract with the landlord or the landlord’s authorized agent, the landlord’s fee interest is not reachable. This protects innocent landlords from finding their property encumbered by work they never agreed to and may not have even known about.

Second — and this one surprises many people — public land and public buildings are entirely exempt from the mechanic’s lien statute. You cannot file a mechanic’s lien on a state building, a municipal property, or any other public asset. That is why Massachusetts requires payment bonds on public construction projects under G.L. c. 149, § 29. If you are working on a public project and have not been paid, the path to recovery runs through the payment bond, not a real estate lien.

The Practical Takeaway: Strict Compliance Is Not Optional

I want to close with the point that often gets lost in conversations about mechanic’s liens: the procedural requirements under G.L. c. 254 are demanding, the timelines are strict, and the courts will not save a lien that was not properly perfected simply because the underlying claim is legitimate. A contractor who did excellent work and is owed a substantial sum can lose all lien rights entirely by missing a filing deadline or failing to serve a required notice.

The same is true on the other side. A property owner who wants to contest or dissolve a lien needs to understand the statutory options available — including bonding off the lien — and needs to act within the appropriate timeframes.

These are not areas where it pays to figure things out as you go. Whether you are a contractor thinking about filing a lien, a subcontractor evaluating your options after a general contractor has not paid you, a design professional asserting rights for the first time under the 2011 amendments, or a property owner who just received a lien notice, the time to get competent legal advice is before you take your next step — not after you have already made a procedural mistake that cannot be undone.

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Massachusetts Real Estate Law Construction Law Mechanic’s Liens