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Philadelphia Property Intelligence

Philadelphia property records, pulled together and explained.

We check 8 official data sources so you don't have to. Violations, permits, tax liens, crime, flood zones, all in one report, plain English.

Always free. Unlimited reports. No account needed.
8 data sources, official Philadelphia and federal sources
Typically under a minute, from address to full report
No account required, just your email
Philadelphia-specific, built for Philly's data
The problem

Philadelphia property data is scattered. We pull it together.

Violations are on one city system. Permits on another. Tax liens on a third. Crime data somewhere else. It takes hours to check them all manually, and you need to know what you're looking for. Flagstone pulls it together in seconds.

"A buyer closes on a rowhouse and discovers unpermitted basement work. Now they own the violation."
- Common scenario
"A homeowner finds out about a demolition permit next door only after the jackhammers start."
- Common scenario
How it works

Three steps. Typically under a minute.

You type an address. We pull every relevant public record, join it together, score the risk, and explain it in plain English.

1

Enter the address

Any Philadelphia property. Residential, commercial, or mixed-use. Apartment or rowhouse. We'll find it.

2

We pull the data

We query the city's official OPA records, L&I permits and violations, 311 service history, and nearby property signals, all in seconds.

3

You get a clear report

A risk score, plain-English summary, interactive map, timeline of events, and a specific list of what to verify before you proceed.

Always free

Every report is free. No limits. No catch.

Run as many reports as you want for any Philadelphia address. Property intelligence should be accessible to everyone, not gated behind a paywall.

8+ Official Data Sources
OPA records, L&I permits and violations, 311 service history, tax liens, deed history, crime data, and FEMA flood zones — all pulled together automatically.
Risk Score + AI Summary
Plain-English analysis of what matters, a risk grade A–F, and specific next steps tailored to what the report actually found.
Interactive Map + Street View
See the property, nearby violations, and recent permits plotted on a live map with Google Street View integration.
No Account Required
Enter an address and your email. You get a shareable report link you can send to your agent, attorney, or partner.
Get Your Free Report →
Get Flagstone Weekly

Philadelphia property intelligence in your inbox every Tuesday. Permit hotspots, violation spikes, neighborhood trends, and properties worth watching.

What you get

What's in every report

Property Snapshot
Parcel data, ownership, assessed value, sale history, year built, building type, zoning. All in one place.
Permit & Violation History
All permits and violations on file with L&I: what was done, who did it, and current status.
Interactive Map + Street View
See the property in context: nearby violations marked, 311 heat layer, Street View link. Know the block, not just the address.
Risk Score + Plain-English Summary
A 0–100 risk score based on documented methodology, plus an AI-written analysis that explains what matters and what to consider next.
Recommended Next Steps
Specific, actionable questions to ask, inspections to order, and documents to request, tailored to what we found.
Tax Delinquency Status
Outstanding tax balances, years owed, and whether the property has been flagged for sheriff sale.

See a real report

Here's a full sample report for 1346 S 9th St in East Passyunk: a real property with real active violations, a real expired permit, and real 311 history. This is exactly what you get, free.

View Sample Report Run Your Own
Who uses Flagstone

Built for anyone making a decision about a Philadelphia property.

Homebuyers
You're under contract or considering an offer. Before your inspection, know what the city knows. Find out about open permits, active violations, and nuisance patterns, all from official city records.
Investors & Landlords
You're running due diligence on a deal. Stop spending 2+ hours manually checking L&I, OPA, and 311. Get a complete compliance picture in minutes, and run it on every property before you make an offer.
Existing Homeowners
Something's changing near your home: construction next door, a new business opening, a demolition permit. Know what's happening on your block before it affects you.
Agents, Attorneys & Inspectors
Give your clients a report they can actually read. Use Flagstone as a pre-showing prep tool or a buyer rep differentiator. The most thorough agents already check this stuff; now they can share it beautifully.
Questions

Common questions

Where does the data come from?
Official Philadelphia and federal sources: OPA assessments, L&I permits and violations, 311 complaints, deed transfers, tax delinquency, police crime data, and FEMA flood zones. The risk score and AI summary are our analysis, not guarantees.
How fast do I get my report?
Typically under a minute. Enter an address and email, and we'll query all 8 sources, run the analysis, and deliver your report by email with a shareable link.
Does this replace a home inspection?
No. We show what city records say. An inspector shows what's physically in the building. You need both, and we'll tell you which inspections to order.
What if the property has no violations or permits?
That's good news, and we'll say so clearly. A clean record means the property hasn't been flagged by the city.
Do you cover properties outside Philadelphia?
Not yet. We're Philadelphia-first because Philly has uniquely rich public data. Other cities are on the roadmap.
Can I share the report with my agent or attorney?
Yes. Every report includes a shareable web link. Send it to anyone involved in the transaction.
How accurate is the risk score?
It weighs open violations, tax delinquency, flood zone status, nearby crime, and property age. It's a starting point, not a guarantee. Every report shows exactly what contributed to the score.
What can't this report tell me?
Physical building condition (get an inspection), title issues (get a title search), and environmental contamination beyond flood zones. We show what the city has on file, not what isn't recorded.
From the blog

Philadelphia property guides

Practical, Philly-specific guides for buyers, investors, and landlords.

Home Inspection & Due Diligence
Philadelphia home inspection guide: rowhouses, investment properties, and what buyers need to know
Party walls, K&T wiring, galvanized pipes, flat roofs, sewer scope — Philly rowhouses have unique risks. Covers inspection contingency, costs, and an 8-item checklist.
Home Inspection & Environmental
Philadelphia underground oil tanks: what buyers and property owners need to know
Buried heating oil tanks are common in pre-1970s Philly rowhouses. Covers how to find them, removal vs. remediation costs, PA DEP rules, and buyer contract options.
Landlord Guides
Philadelphia tenant screening guide: background checks, fair housing, and how to find good renters
Covers the PFPO source-of-income ban, Ban the Box criminal record restrictions, credit and background check services, FCRA adverse action notices, Section 8 voucher rules, income verification, and an 8-item landlord screening checklist.
View all guides →

Check any Philadelphia address. Always free.

8 official data sources. Violations, permits, tax liens, crime, flood zones, explained in plain English.