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California research library

Property Feasibility Learning Center

Choose a focused guide for the decision in front of you: checking a parcel, comparing an ADU path, researching vacant land, or preparing questions for a local department.

20Flagship guides
17Research topics
120Supporting guides

Buying or checking land

Jurisdiction, zoning, access, utilities, septic, wells, fire, and title questions before an offer.

Open starting guide

Planning an ADU

Scope, costs, utilities, sitework, permits, and builder questions for California ADU projects.

Open starting guide

Researching a tiny home

Classification, wheels versus foundation, occupancy, and the local approval path.

Open starting guide

Flagship California guides

Start here for the decisions most likely to affect a purchase, project scope, or early budget.

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Search the guide library

Find one focused starting point by project, property issue, or department question.

120 guides

Jurisdiction

What Is an APN?

Use the assessor parcel number to connect a property to official maps, zoning, jurisdiction, ownership, and due-diligence records.

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Jurisdiction

How County Jurisdiction Works

A focused California guide to how county jurisdiction works, including official questions, documents to collect, red flags, and practical next steps.

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ADUs

Detached ADU Checklist

Review detached adu checklist through California ADU rules, local objective standards, utilities, fire access, and site limits.

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Septic & Wells

Public Sewer vs Septic

Use public sewer vs septic to organize environmental health questions before assuming rural land can support a dwelling or ADU.

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Septic & Wells

Public Water vs Well

Use public water vs well to organize environmental health questions before assuming rural land can support a dwelling or ADU.

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Department Questions

Electrical Service Questions

A focused California guide to electrical service questions, including official questions, documents to collect, red flags, and practical next steps.

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Fire Access

Defensible Space Basics

Review defensible space basics with fire authority questions about access, water supply, WUI standards, and defensible space.

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Overlays

Coastal Zone Issues

A focused California guide to coastal zone issues, including official questions, documents to collect, red flags, and practical next steps.

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Overlays

Flood Zone Issues

A focused California guide to flood zone issues, including official questions, documents to collect, red flags, and practical next steps.

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Overlays

Hillside and Slope Concerns

A focused California guide to hillside and slope concerns, including official questions, documents to collect, red flags, and practical next steps.

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Utilities

Utility Connection Questions

Check utility connection questions before assuming service is physically available, locally recognized for connection, or affordable to extend.

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Septic & Wells

Perc Test Explained

Learn what a perc test can and cannot answer before relying on rural land, septic design, or seller claims.

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ADUs

Junior ADU Basics

Review junior adu basics through California ADU rules, local objective standards, utilities, fire access, and site limits.

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Department Questions

Questions to Ask Planning

A focused California guide to questions to ask planning, including official questions, documents to collect, red flags, and practical next steps.

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Zoning

What Is a Setback?

A focused California guide to what is a setback?, including official questions, documents to collect, red flags, and practical next steps.

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Zoning

What Is Lot Coverage?

A focused California guide to what is lot coverage?, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

What Is Floor Area Ratio?

A focused California guide to what is floor area ratio?, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

What Are Development Standards?

A focused California guide to what are development standards?, including official questions, documents to collect, red flags, and practical next steps.

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Zoning

What Is a Variance?

A focused California guide to what is a variance?, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

What Is Site Plan Review?

A focused California guide to what is site plan review?, including official questions, documents to collect, red flags, and practical next steps.

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Tiny Homes

Tiny Homes in Backyards

Review tiny homes in backyards through classification, zoning, utilities, building-code path, occupancy, and local verification.

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ADUs

ADUs on Rural Parcels

Review adus on rural parcels through California ADU rules, local objective standards, utilities, fire access, and site limits.

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ADUs

Septic and ADUs

Use septic and adus to organize environmental health questions before assuming rural land can support a dwelling or ADU.

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Professional Help

SB9 Basics

A focused California guide to sb9 basics, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

Common Mistakes Buyers Make

A focused California guide to common mistakes buyers make, including official questions, documents to collect, red flags, and practical next steps.

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Septic & Wells

What Is a Perc Test?

Use what is a perc test? to organize environmental health questions before assuming rural land can support a dwelling or ADU.

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Overlays

Flood Zones and Small Homes

A focused California guide to flood zones and small homes, including official questions, documents to collect, red flags, and practical next steps.

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Overlays

Slope and Grading Issues

A focused California guide to slope and grading issues, including official questions, documents to collect, red flags, and practical next steps.

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Vacant Land

Easements Explained

Use easements explained to spot access, title, parcel-status, and due-diligence issues before buying land.

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ADUs

ADU vs JADU

Review adu vs jadu through California ADU rules, local objective standards, utilities, fire access, and site limits.

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Professional Help

California Building Code Basics

A focused California guide to california building code basics, including official questions, documents to collect, red flags, and practical next steps.

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Permits

How Plan Check Works

Use how plan check works to prepare clearer building, plan-check, correction, inspection, and submittal questions.

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Professional Help

When You Need an Architect

A focused California guide to when you need an architect, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

When You Need a Civil Engineer

A focused California guide to when you need a civil engineer, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

When You Need a Surveyor

A focused California guide to when you need a surveyor, including official questions, documents to collect, red flags, and practical next steps.

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Professional Help

What a Site Plan Must Show

A focused California guide to what a site plan must show, including official questions, documents to collect, red flags, and practical next steps.

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Before You Hire

How to Estimate ADU Feasibility

Use how to estimate adu feasibility to compare scope, assumptions, documents, local experience, utility questions, and estimate readiness before hiring or buying.

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