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See your Seattle lot.
Know its potential.

Seattle zoning, site conditions, and housing possibilities in one place. Built for owners and builders planning their next move.

See how it works
Scattered sources. Clearer property decisions.Zoning, Parcel records, Owner records, Building footprint, Environmental layers, Critical areas, Elevation, Trees, Permits, Utilities, Proximity to transit, Proximity to schools, Geometry constraints connect through LotFactor into clear feasibility analysis, potential blockers, development scenarios, density constraints, nearby supply (permits).

Scattered sources

  • Zoning
  • Parcel records
  • Owner records
  • Building footprint
  • Environmental layers
  • Critical areas
  • Elevation
  • Trees
  • Permits
  • Utilities
  • Proximity to transit
  • Proximity to schools
  • Geometry constraints
LotFactorFeasibility, connected.

Clearer decisions

  • Clear feasibility analysisSee the whole site in one place.
  • Potential blockersFlag what needs a closer look.
  • Development scenariosCompare options for Seattle NR lots.
  • Density constraintsUnderstand what limits unit count.
  • Nearby supply (permits)See the development pipeline.

Public records.
One connected view.

County assessor recordsSeattle zoning codePublic GIS layersPermit & utility context

Less digging.
More understanding.

From Seattle public records to a focused feasibility view. Find the facts and the questions that need further investigation.

Find your property

Search an address, paste a parcel ID, or explore nearby parcels on the map.

Connect the evidence

Read parcel records alongside zoning, mapped constraints, and available development scenarios.

Build your shortlist

Save properties, return to recent searches, and export supported scenario reports.

Your Seattle research.
In one feasibility view.

See parcel records, mapped constraints, and modeled possibilities together. Understand what is known and what still needs verification.

Illustrative LotFactor feasibility analysis of a fictional Seattle NR parcel, combining zoning, environmental context, infrastructure, transit, nearby permits, property records and aerial context. The 1,600 sq ft study area is illustrative, not a calculated parcel result. No owner, address or parcel number is shown.

Feasibility, in focus.

One property. Connected evidence.

Fictional 50 by 100 ft parcel showing an existing building, trees, water and sewer lines, nearby permit markers and an illustrative 1,600 sq ft study area. Not a site plan or calculated result.
ParcelStudy areaExisting buildingWaterSewerNearby permits

The facts behind the site.

A connected starting point for diligence.

Parcel & zoning
Seattle NR · 5,000 sq ft
Environmental context
Tree canopy, contours & mapped ECAs
Infrastructure
Water, sewer & drainage records
Access & activity
Transit context & nearby permits
Property records
Building facts & assessor data

Aerial context

Schematic neighborhood canopy and buildings around the same fictional parcel.

Site context, alongside the records.

A better starting point
for due diligence.

From the first property you screen to the shortlist you share, keep the details that matter in view.

Understand the site

Bring available parcel records, zoning, environmental overlays, transit, utilities, and permit context into the same view.

Keep the open questions visible

See modeled assumptions and verification gaps, so you know what to investigate next.

Take the research with you

Save favorites, revisit recent searches, and export a PDF with parcel context and modeled results.

A few things
worth knowing.

Which properties can I research?

LotFactor specializes in Seattle residential feasibility. Automated development scenarios cover Seattle Neighborhood Residential (NR) lots, including housing and ADU options. Searches outside Seattle in King, Pierce, and Snohomish counties return basic county/state property records, approximate parcel measurements, and maps, without city-specific analysis or scenarios.

What does the Seattle feasibility analysis include?

Review parcel and assessor records alongside Seattle zoning, mapped critical areas, trees, transit, utilities, and nearby permits. For NR lots, compare conditional housing and ADU scenarios, floor area, and coverage. Maps and approximate measurements help you identify questions for a survey and project review; they do not establish development approval.

Can I use a report to make a purchase decision?

Use it to screen opportunities and focus your next round of diligence. Modeled results are not permit approval. Verify source records, survey and title conditions, utility capacity, site constraints, and applicable code with the jurisdiction and qualified professionals before relying on a result.

Is LotFactor free to use?

Yes. A free account includes 100 property searches per month. No credit card is required. You can save favorite properties, revisit recent searches, and export PDF reports.

Your next opportunity
starts with a closer look.

Put your next Seattle property into perspective.

Free account · No credit card required