Vacant Land Due-Diligence Checklist (Free Tools for Every Step)
Land due diligence has a natural order: do the checks that cost nothing first, because roughly a third of parcels die on those, and there is no reason to spend $600 on a survey to discover something a free federal dataset would have told you in fifteen seconds.
Stage 1 — Free desktop checks (do these before you make an offer)
Every item here can be answered from public data without leaving your desk. LandCheck automates the first five in a single lookup.
| Check | Why it kills deals | Source |
|---|---|---|
| Flood zone | Zone A or V means mandatory insurance and, in many counties, elevation requirements that reshape the build | FEMA NFHL |
| Slope | Above about 15% average, foundation and driveway costs rise sharply; some counties restrict building outright | USGS 3DEP |
| Wetlands | A mapped wetland can make the buildable area a fraction of the acreage | USFWS NWI |
| Soil & septic rating | A "very limited" septic rating means an engineered system — often $20k–$40k more | USDA SSURGO |
| Hydric soils | Strong wetland indicator even where nothing is mapped | USDA SSURGO |
| Aerial history | Dumping, grading, structures that came and went, seasonal standing water | Historical aerial archives |
| Zoning & overlay | Determines whether your intended use is even permitted | County zoning map |
| Tax status | Back taxes, ag exemption rollback liability | County treasurer |
| Recorded documents | Easements, covenants, mineral reservations | County recorder |
The rollback trap. Land carrying an agricultural exemption often triggers several years of back taxes at the non-agricultural rate the moment the use changes. Ask the assessor what the rollback liability is before you close, not after.
Stage 2 — Phone calls (still free)
- County planning: is the parcel a legal lot of record? Can it be built on? What is the setback and minimum lot size?
- County health department: what are the septic rules, and has a perc test ever been done here?
- Road department: is the access road public or private? Who maintains it? Is a driveway permit required?
- Utilities: distance to the nearest power drop, and the cost per foot to extend it. This single number sinks more rural deals than anything else.
- Water utility or well drillers: is there service, or what is the typical well depth and cost in this area?
Stage 3 — Paid, only once stages 1 and 2 pass
- Title search / commitment — the only way to see the real encumbrance picture.
- Survey — boundaries, encroachments, and the acreage you are actually buying.
- Perc test / soil evaluation — the binding version of the septic question.
- Phase I environmental — if aerial history or use suggested any reason for concern.
- Wetland delineation — if NWI or hydric soils flagged anything.
Write the contingencies before you sign
An inspection period is worth nothing if the contract does not let you walk for the reasons you actually care about. At a minimum, make the offer contingent on satisfactory perc results, confirmation of legal access, a clean title commitment, and confirmation that your intended use is permitted.
The five questions that decide most deals
- Can I get legal, recorded access to it?
- Can I get water, power and waste disposal, and what does that cost?
- Is the buildable area big enough after flood, wetland and slope constraints?
- Does zoning permit what I want to do?
- Is anything recorded against it that I cannot live with?
Answer those five honestly and you have done more diligence than most buyers.
Common questions
What is the most common reason land deals fail?
Access and septic. A parcel with no recorded legal access is effectively unbuildable until an easement is negotiated, and a failed perc test can eliminate conventional septic entirely. Both are cheap to investigate early and expensive to discover late.
How long should a land due-diligence period be?
Thirty to sixty days is typical. Perc tests and surveys are scheduling-dependent and rural counties can be slow, so build in more time than a house purchase would need.
Can I do due diligence without visiting the property?
You can do a great deal of it — flood, slope, wetlands, soil, zoning, taxes and recorded documents are all remote. But you should still walk the land or send someone before closing. Photographs and data miss smells, noise, neighbours and road conditions.
Is a perc test always required?
Only where a septic system is needed, meaning no municipal sewer. Requirements and test methods vary by county health department, and some counties accept a soil evaluation by a licensed evaluator instead of a traditional percolation test.
Run this check on a real parcel
Paste an address or coordinates and get flood zone, slope, wetlands and soil in about fifteen seconds. Free, unlimited, no account.