Nonconforming Uses & Prior Lawful Use Protection

Your property has been used for a certain purpose for years without incident. Then the municipality changes its zoning ordinance, and your lawful use is no longer permitted in that zone. Are you out of luck? Not necessarily. Pennsylvania's Municipalities Planning Code (MPC) protects nonconforming uses , uses that existed before the zoning change and do not comply with the new rules. This is the prior lawful use doctrine , which draws on the MPC's definition of a nonconforming use (53 P.S. § 10107) together with the constitutional and common-law protections Pennsylvania courts have long recognized.

If you operate a property that does not conform to current zoning, nonconforming use rights are critical. Get it wrong and you could lose decades of investment and operational continuity.

What Is a Nonconforming Use?

A nonconforming use is a use that existed lawfully before a zoning change but no longer complies with the applicable use provisions of the zoning ordinance (53 P.S. § 10107). The key requirement: the use must have been lawfully in existence prior to enactment of the ordinance or amendment .

Example: You have operated a small machine shop for 20 years. The city rezones your block from Industrial to Residential, and the shop no longer complies. But if you were operating legally before the rezoning, you have a nonconforming use and may continue it.

The policy behind this protection is fairness: the law does not penalize owners for using their land in a way that was perfectly lawful when they began. To do otherwise would cause massive, uncompensated losses.

The Prior Lawful Use Doctrine

The prior lawful use doctrine is straightforward: if you can prove your use was lawful before the zoning changed, you are generally protected to continue it. No variance, no special exception. The use is grandfathered in.

To claim nonconforming use status, you must demonstrate:

• Your use existed before the zoning ordinance was enacted or amended in the manner that made it nonconforming
• The use was lawful at the time it commenced
• The use is the same (or substantially the same) as before the zoning change
• You have maintained continuity of the use (not abandoned it)

Evidence of prior lawful use includes property tax records, business licenses, utility accounts, photographs, testimony from longtime residents, and historical city records. If the zoning officer sends a cease and desist order, clear evidence of the use's pre-zoning origin is your first defense.

Expansion Limitations and Natural Expansion

Here is where nonconforming use protection gets complicated. Pennsylvania law permits nonconforming uses to continue, but it does not permit unlimited expansion or intensification (53 P.S. § 10605(1.1) authorizes municipalities to regulate nonconforming uses and structures, and most do through their zoning ordinances). The question becomes: what increases are allowed?

Most municipalities distinguish between:

• Natural expansion: modest, ordinary growth without fundamental changes (slight increase in floor area, modest addition of equipment or staff). In Pennsylvania, natural expansion of a nonconforming use is not a permission the municipality may withhold at will. It is a vested constitutional right protected by the due process clause. A municipality may reasonably regulate that growth, but cannot flatly prohibit it (Silver v. Zoning Bd. of Adjustment, 435 Pa. 99 (1969)).
• Prohibited expansion: major changes such as a large increase in the footprint, adding new or different uses, or changing the character of the use. These typically require a variance or new conditional use approval. Be careful with the percentage figures some ordinances use. A flat numeric cap (for example, deeming any expansion over 25% prohibited) is not automatically controlling, because an ordinance cannot extinguish the vested right of natural expansion by a fixed number. The test is reasonableness in light of the natural growth of the business, so an expansion may still be protected even if it exceeds a local cap (Silver v. Zoning Bd. of Adjustment, 435 Pa. 99 (1969)).

For example, if your machine shop has operated for 30 years and you add a 10% addition to house new machinery, a court might permit this as natural expansion. But doubling the facility's size and adding a retail showroom likely exceeds natural expansion and requires zoning relief.

Check your municipality's zoning ordinance for its natural expansion threshold. Many set a percentage cap (e.g., no more than 20% expansion without new approval). Such a cap does not, by itself, defeat a constitutional natural-expansion claim. If your plan exceeds the local limit, you may still have a viable natural-expansion right, but consult counsel and consider filing for a variance or conditional use before making improvements to avoid an enforcement fight.

Abandonment and Discontinuance

One of the greatest risks to nonconforming use protection is abandonment . Stop using your property for its nonconforming purpose, and you may lose the right to resume it. Pennsylvania law does not, however, impose a statutory bright-line cutoff. Abandonment requires proof of both an intent to abandon the use and an actual discontinuance of it; mere non-use, even for an extended period, is not by itself abandonment.

Many municipal zoning ordinances contain a discontinuance provision, often deeming a use abandoned after it ceases for a set period such as 12 consecutive months . Pennsylvania courts treat such ordinance periods as creating a rebuttable presumption of intent to abandon, not an automatic forfeiture. A property owner can overcome the presumption with evidence that the interruption was temporary and that there was no intent to give up the use.

Even so, the risk is serious. If you close your business for a year to renovate, restructure, or weather economic hardship, a municipality may invoke its ordinance to argue abandonment, and you may have to litigate intent. If the status is lost, you cannot simply resume; you would need a new variance or conditional use permit.

To protect yourself:

• Maintain some ongoing use, even if minimal (e.g., keep the sign up, continue light maintenance, pay utilities)
• If you must cease the use, document the interruption in writing and have an attorney advise whether your municipality's discontinuance provision applies to your facts
• Before any extended closure, consult your zoning officer about alternatives or relief available
• Keep detailed records of when the use began and when any interruptions occurred

Courts have found that temporary or unintentional interruptions do not trigger abandonment if the owner's intent to resume is clear. But the burden of proof is on the owner, and the law is strict.

Registration and Documentation

Many municipalities require registration of nonconforming uses with the zoning officer (53 P.S. § 10613, with section 814-A applying the same rule to joint municipal zoning ordinances). Registration typically requires:

• A formal application to the zoning office
• Evidence of prior lawful use (property tax records, business licenses, utility accounts, affidavits)
• A description of the current use and any changes made since the zoning change
• Payment of a registration fee (usually modest, $100 to $500)

Even if registration is not required, obtain written acknowledgment from the zoning officer that your use is nonconforming . This creates a paper trail. If you are later challenged, you have evidence of the municipality's own recognition of your rights.

If the zoning officer refuses to register your use, you can appeal that refusal to the Zoning Hearing Board within the time frame set by your municipality's ordinance (typically 30 days).

Receiving a Zoning Violation Notice

If you receive a cease and desist order or violation notice from the zoning officer:

1. Do not ignore it. Violations typically have strict deadlines for response. Missing the deadline can waive your rights.
2. Gather evidence immediately. Collect property tax records, business license records, photographs, utility bills, lease documents, and affidavits from longtime employees or neighbors who can attest to the use's age and continuity.
3. Send a written response to the zoning officer. Clearly state that the use is nonconforming, provide your evidence, and cite the MPC's nonconforming use definition (53 P.S. § 10107). Request written acknowledgment that the use is protected.
4. If the zoning officer disputes your claim, file an appeal to the Zoning Hearing Board. The ZHB will hold a hearing, take sworn testimony, and decide whether your evidence proves prior lawful use.
5. Consider consulting an attorney. Zoning cases turn on factual detail and statutory interpretation. A land use attorney can be the difference between retaining your use rights and losing them.

Nonconforming Structures and Uses

Related to nonconforming uses is the concept of nonconforming structures (53 P.S. § 10107). A nonconforming structure is a building or part of a building that existed before the zoning change and does not comply with setback, height, lot coverage, or other dimensional requirements of the new ordinance. Like nonconforming uses, they may generally continue but are subject to limits on expansion and alteration.

If the use and the structure are both nonconforming, you have double protection, but both are subject to abandonment risk and expansion limitations.

Relationship to Comprehensive Plans

Nonconforming use protection is a local matter governed by each municipality's zoning ordinance, but the protections must be consistent with Pennsylvania's Municipalities Planning Code. A comprehensive plan (discussed in our article on comprehensive plans and their legal effect ) may suggest phased elimination of nonconforming uses over time, but only if the municipality chooses to impose such a limit. Courts have generally been skeptical of ordinances that purport to eliminate existing nonconforming uses without compensation.

Statutory content on this page was last verified against Pennsylvania statutes (20 Pa.C.S.; 72 P.S. Art. XXI): Jun. 2026. If you are reading this significantly after that date, confirm key provisions with current statute text or contact our office.