Is this lot buildable? Run the engineer's checks free.

Cheap land is usually cheap for a reason, and the reason is almost always one of five things: flood zone, wetlands, bad soil, steep slope, or a stream setback. SitePrior checks all five on any address in about a minute, from the federal sources engineers use.

All five checks are free. Full engineer's verdict is $29.

Real data, no fakes.  FEMA NFHL · USFWS NWI · USDA SSURGO · USGS 3DEP & NHD · NOAA Atlas 14

The five checks that decide buildability

  1. Flood zone. A, AE, AO, or VE means mandatory insurance with a loan, elevated construction, and in the floodway usually no construction at all. Pulled live from FEMA.
  2. Wetlands. A National Wetlands Inventory polygon on the building site means a delineation and possibly a federal permit before you can move dirt.
  3. Soil. Hydrologic group C or D and a poorly drained class point to septic problems, expansive clay, and wet basements. From the USDA soil survey.
  4. Slope. Over about 15 percent, foundations, driveways, and erosion control start adding real money. Over 25 percent, many jurisdictions require engineered grading plans. From USGS 1-meter elevation data.
  5. Streams. Most states and many counties impose riparian buffers of 25 to 100 feet or more. A stream through a small lot can consume the buildable area. From the USGS hydrography dataset.

The preview shows each of these plus design rainfall, land cover, seismic category, and where applicable wildfire, sea-level rise, critical habitat, and the county planning jurisdiction.

What "buildable" actually costs

Almost every lot is buildable at some price. The question a buyer needs answered is whether the price of the lot plus the price of overcoming its problems is still a deal. A 22 percent slope with Group C soil is buildable with engineered footings and retaining walls that can cost more than a modest lot. A zone AE fringe lot is buildable with fill and an elevation certificate. A floodway lot or a lot whose only dry ground is a wetland is usually not buildable at all.

The free preview shows the raw flags. The $29 report is the verdict: each red and yellow flag ranked, what it means for this lot, a typical dollar range to address it, and the specific professional to hire next, so you can price the deal correctly or walk away before the earnest money is at risk.

Before you make an offer on cheap acreage, read the rural land red-flags guide and the county GIS vs. federal data explainer on what each source can and cannot tell you.
What this isn't: SitePrior results are screening tools, not engineering opinions of record. They do not constitute a flood certificate, a wetland delineation, a soil evaluation, or a survey. Permit-grade work requires a state-licensed engineer, surveyor, or soil scientist in your state. We tell you whether you probably need one.

Frequently asked questions

Is this a substitute for a site visit?

No. It is what you do before the site visit so you know what to look for, and after it so you can check what you saw against the maps. Nothing replaces walking the lot after a heavy rain.

Does the check cover zoning and setbacks?

The preview identifies the county planning jurisdiction and links you to its portal, but zoning rules are local and change constantly, so SitePrior does not attempt to interpret them. The physical constraints in the report are what zoning rules are usually reacting to.

Can I run several lots and compare them?

Yes. The 5-pack at $99 includes a saved dashboard with side-by-side comparison, built for buyers and builders evaluating multiple parcels. The free preview can be run on as many addresses as you like.

Can I use the report in a negotiation?

Buyers do. A documented flood zone, wetland hit, or Group D soil is a concrete basis for a price reduction or for asking the seller to pay for a delineation or soil evaluation. The report is a screening document, so present it as the reason to order the professional study, not as the study itself.

Other free checks

Flood zone lookupFEMA zone and BFE by address Wetlands checkNWI polygons on and around the lot Septic soil checkSoil group and drainage class Buyer guideRed flags on cheap rural land: what the price is telling you