Fishtown by the numbers
Every figure below is queried from a named public dataset. Nothing here is estimated.
| Properties on the assessment roll | 13,693 | OPA |
| Average year built | 1928 | OPA |
| Built before 1940 | 73% | OPA |
| Built before 1978, so presumed to contain lead paint | 75% | OPA |
| Rowhouse or attached form | 68% | OPA |
| Claiming the Homestead Exemption | 32% (4,353) | OPA |
| Active rental licenses | 1,179 | L&I |
| Violations currently open | 4,679 | L&I |
| Violation cases opened, last 12 months | 4,308 | L&I |
| Permits issued, last 12 months | 2,172 | L&I |
Source and limits. Counts are for ZIP 19125, pulled from the City of Philadelphia's OPA and Licenses & Inspections datasets on 2026-09-02 via the city's public API. A ZIP is wider than a neighborhood, so treat these as the surrounding area rather than the specific blocks. Two known limits: the assessor's year-built field is unreliable for the oldest buildings and often records a later renovation, and the Homestead Exemption is opt-in, so the share claiming it is a floor for owner-occupancy, not a measure of it.
Why Fishtown properties need extra scrutiny
Fishtown's rapid gentrification — from fishermen's rowhouses to $800K condos in under a decade — means the neighborhood's building stock has been aggressively renovated, converted, and subdivided. That's not inherently a problem, but it creates a specific pattern of property record risk that buyers often miss.
The most common issues on Fishtown properties:
- Unpermitted roof decks. Adding a roof deck to a Philadelphia rowhouse requires a permit, structural review, and often a zoning variance. Many Fishtown roof decks were added without going through that process — and the violation doesn't disappear when you buy the house. It becomes your problem.
- Condo conversions with open permits. When a two- or three-unit house was converted to condos, each unit should have had its own set of permits. Many don't. If the original conversion permit was never closed, there may be ongoing code compliance issues affecting the whole building.
- Flipped violations. Properties that sold quickly during the renovation wave sometimes cleared violations on paper without completing the actual work. A "complied" status in L&I records means someone filed paperwork — it doesn't mean the work was done properly.
- Zoning classification mismatches. The neighborhood's mix of RSA-5 (single-family), RM-1 (multifamily), and CMX-2 (mixed-use) zones is dense and irregular. A property marketed as a "triplex" may be in a zone that only permits two units — potentially illegal use from day one.
Roof deck risk: Philadelphia has had several roof deck collapses in recent years. L&I takes structural violations on roof decks seriously. If a Fishtown property has a roof deck with no matching permit, budget $5,000–$25,000 to legalize it or remove it — or use it as a negotiating point before closing.
Fishtown zoning and what it means for investors
Fishtown sits in a dense mix of zoning classifications. The core residential streets are primarily RSA-5 (single-family attached), but the neighborhood also contains significant stretches of CMX-2 (neighborhood commercial mixed-use) along Frankford Avenue and Girard Avenue, and RM-1 and RM-2 multifamily zones closer to the waterfront and industrial edge.
What this means for investors:
- A property on a CMX-2 corridor has by-right mixed-use potential — ground-floor commercial, residential above. That's valuable. Confirm the actual zoning before pricing in that potential.
- RM-1 and RM-2 properties can legally be multifamily — but confirm the number of units is consistent with what permits were pulled. "Investor added a unit" often means "someone did this without permits."
- RSA-5 properties cannot be legally rented as multifamily units without a variance. A three-unit rowhouse on an RSA-5 block is an illegal structure. If L&I investigates — or a new buyer's lender requires a zoning conformance letter — the situation can become expensive fast.
What to check on every Fishtown property
- Open L&I violations. Any violation with status other than "Closed" or "Complied" is unresolved. Roof, structural, electrical, and plumbing violations are highest priority. Don't accept a seller's verbal assurance that "it's being handled."
- Permit history vs. visible work. Look at the permit history and compare it to what you can see in the property. New windows with no window replacement permit. Finished basement with no electrical permit. New bathroom with no plumbing permit. These are unpermitted improvements that may need to be inspected or redone.
- Recent permit status. A permit that was issued but never closed (status: "Issued" rather than "Completed") is a problem. It means the work was never inspected and signed off. The permit may be expired. The inspector may require it to be pulled again and the work done differently.
- 311 complaint history. Neighbors call 311. Repeated "illegal construction," "noise," "illegal dumping," and "stormwater" complaints are worth understanding before you buy.
- Zoning classification. Verify it matches the use. If it doesn't, ask why — and whether any variance was obtained.
Run a free report on any Fishtown address
Flagstone pulls L&I violations, permit history, 311 complaints, OPA records, and flood zone data in under a minute. Always free.
Check a Fishtown addressThe Fishtown permit surge — and what it left behind
Between 2015 and 2023, Fishtown saw a surge in construction activity — new construction on vacant lots, gut rehabs of rowhouses, conversions, additions, and commercial build-outs. That activity accelerated during the pandemic-era housing boom.
L&I, Philadelphia's Department of Licenses and Inspections, was stretched thin during peak activity years. Processing delays and inspection backlogs meant some permits never got final inspections. Others lapsed before work was completed. And some contractors simply never closed out their permits after finishing jobs.
For buyers today, this means a Fishtown property with visible recent work may have permit history that doesn't match reality. Either the permits don't exist (unpermitted work), or they exist but were never closed (open permits that may require reinspection).
The practical risk: an open permit can delay a title search, create issues with title insurance, or surface as a condition in your lender's underwriting. In the worst cases, an unpermitted addition or structural modification may need to be removed or brought up to current code — at the buyer's expense.
Common Fishtown violation types
Based on the pattern of L&I activity in Fishtown, the most common violation categories include:
- PM-102.6.3 / exterior maintenance: Deteriorated siding, masonry, or trim on the building exterior. Common on older rowhouses that were partially renovated but the exterior was skipped.
- PM-304.1 / structural: Structural deficiencies — sagging roofs, unstable walls, foundation issues. Often flagged after a neighbor complains about construction activity affecting their wall.
- BC-606 / HVAC without permit: New HVAC systems, mini-splits, and rooftop units installed without a mechanical permit. Very common on flipped properties where speed was prioritized over process.
- Zoning violation / illegal use: Operating a property inconsistently with its zoning — extra units, illegal rental, commercial use in a residential zone. Increasingly common as short-term rental enforcement has picked up.
- PM-505.1 / plumbing: Leaks, improper drainage, or unsealed drains. Often found during gut rehabs when old plumbing is partially updated but not fully replaced.
Pro tip: Even "complied" violations are worth reading. If a violation was filed in 2021 and marked complied the same week, that's unusual — it usually means the owner filed a compliance report but there's no record of actual remediation. Ask for documentation of what was done.
Flood risk in Fishtown
Most of Fishtown proper — the core residential streets between Frankford Avenue and the Delaware — sits in FEMA's Zone X (minimal flood hazard). However, the eastern edge of the neighborhood closest to the Delaware River waterfront includes parcels in Zone AE (Special Flood Hazard Area), particularly around the I-95 underpass corridor and Penn Treaty Park area.
If you're looking at a property in the waterfront section of Fishtown — roughly east of Beach Street or near the river — always confirm the flood zone before making an offer. A Zone AE designation adds mandatory flood insurance to your carrying costs and affects lender requirements.
For properties elsewhere in Fishtown, urban flooding (combined sewer overflow during heavy rain) is more common than river flooding. Check 311 complaint history for "basement flooding" and "stormwater" complaints. These indicate drainage or sewer issues that FEMA flood maps don't capture.
Other Philadelphia neighborhoods
How this page is put together. The violation, permit and 311 counts are queried live from the City of Philadelphia's open data each time the page loads, and the area medians come from the U.S. Census Bureau as cited above. The written commentary is generated automatically and is not individually fact-checked: treat it as orientation to this part of the city and to the questions worth asking, not as a finding about any particular property. Anything that affects a decision should be confirmed against that property's own records and with the relevant City department. A Flagstone report pulls those records for a specific address.