Philadelphia Property Intelligence

Know what a property is hiding before you commit.

Type in any Philadelphia address. Get a plain-English report on permits, violations, 311 complaints, flood risk, and nearby signals — in under 5 minutes.

No account needed. Report delivered by email in <5 minutes.
4 data sources — all official Philadelphia records
<5 min — from payment to report in your inbox
No account required — just your email
Philadelphia-specific — built for Philly's data
The problem

Buying property in Philly is full of hidden risk.

Most people find out what they missed after they've already signed. The data exists — it's just scattered, technical, and impossible to interpret without context.

"Found out after closing there was unpermitted work in the basement. Now I own the violation."
— First-time homebuyer, South Philadelphia
"I check L&I, OPA, and 311 for every deal. It takes me 2–3 hours per property and I still feel like I'm missing something."
— Small investor, 6-unit portfolio, Fishtown
"Construction started next door. I had no idea they'd gotten a demolition permit until I heard the jackhammers."
— Homeowner, East Passyunk
How it works

Simple. Fast. No technical knowledge needed.

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, FEMA flood data, 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.

What's in every report

Everything that matters. Nothing you have to look up yourself.

Property Snapshot
Parcel data, ownership, assessed value, sale history, year built, building type, zoning. All in one place.
Permit & Violation History
Every permit and L&I violation ever filed — what was done, who did it, whether it was completed or is still open.
311 Service History
Every complaint filed at or near the property — maintenance issues, abandoned vehicles, dumping, graffiti, nuisance patterns.
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.
Flood & Environmental Risk
FEMA flood zone status, drainage complaint patterns nearby, and infrastructure risk signals from city records.
Risk Score + Plain-English Summary
A 0–100 risk score across 6 dimensions, plus an AI-written summary that explains what matters, why it matters, and what to do next.
Recommended Next Steps
Specific, actionable questions to ask, inspections to order, and documents to request — tailored to what we found.
Professional Referrals
Based on what we find, we tell you which type of professional to contact — inspector, attorney, structural engineer, permit expediter.

See a real report before you buy

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'd receive.

View Sample Report See pricing
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 that your agent might not mention — or might not even know about.
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.
Pricing

Start with one report. Scale when you need to.

No subscriptions required to start. Pay for what you need.

$29
one-time, per report
Single Report
Perfect for buyers or owners checking one property.
  • Full property intelligence report
  • All 4 data layers (OPA, permits, violations, 311)
  • Interactive map + Street View
  • Risk score + AI summary
  • Next steps + pro referrals
  • PDF delivered by email in <5 min
  • Shareable web link
Get a Report
$49
per month — cancel anytime
Investor Plan Most Popular
For investors running multiple deals. Unlimited reports + portfolio monitoring.
  • Unlimited property reports
  • Everything in Single Report
  • 5 address monitors (alerts when things change)
  • Nearby permit scan (500ft radius)
  • CSV export for portfolio tracking
  • Priority report generation
Start Investor Plan
$9
per month, per address
Address Watch
Monitor your home or a target property. Get alerts when anything changes.
  • Alert when new permit filed
  • Alert when new violation opened
  • Alert when 311 complaint filed
  • Monthly block activity digest
  • Cancel anytime
Start Watching
Coming soon

Be first when new features launch.

We're building tools that serious buyers and investors have never had before. Join the early access list — no spam, just a heads-up when these go live.

Address Watch

Real-time alerts when a permit is filed, a violation is opened, or a 311 complaint is lodged at any address you're monitoring.

Portfolio Dashboard

Track all your properties in one place. See compliance changes, new activity, and neighborhood signals across your entire portfolio.

Neighborhood Reports

Block-level and neighborhood-level intelligence — not just a single address. See permit and violation trends for entire corridors.

No spam. One email when each feature ships. Unsubscribe anytime.
You're on the list. We'll reach out before it goes public.
Questions

Common questions

Where does the data come from?
All data comes from official Philadelphia government sources — the Office of Property Assessment (OPA), the Department of Licenses & Inspections (L&I), Philadelphia 311, and FEMA flood maps. We don't invent or estimate anything. If it's in the city's records, it's in your report.
How fast do I get my report?
Under 5 minutes. After you pay, our system pulls all the data, generates the report, and emails you a PDF and a web link. You'll have it before you finish your coffee.
Does this replace a home inspection?
No — and we'll tell you that in the report. A Flagstone report tells you what city records say. A home inspector tells you what's physically in the building. You need both. We tell you what inspections to order based on what we find.
What if the property has no violations or permits?
That's good news, and we'll say so clearly. A clean record is valuable information — it tells you the property hasn't been flagged by the city and hasn't had major permitted work that could signal hidden issues.
Do you cover properties outside Philadelphia?
Not yet. We're launching Philadelphia-first because Philly has uniquely rich and accessible 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.

Don't find out after you close.

$29 to know everything the city knows about a property. Before you commit.