A passing perc is the threshold
On unsewered ground, everything downstream depends on whether a septic system can be permitted. A percolation test or soil evaluation typically costs a few hundred to roughly two thousand dollars depending on the state and the method — several states have moved to soil profile evaluation by a licensed soil scientist rather than a water-based test. Soil that drains too slowly or sits over a high water table does not always fail permanently; it often moves the project to a mound or aerobic system, which commonly runs two to three times a conventional installation. A passing perc result, or better an issued septic permit, is the single most valuable document a rural seller can hold, because it converts an open question into a number.
Water is a permit and a depth
Two separate questions decide whether a homesite has water. The first is legal: most western states regulate groundwater as a shared resource and exempt small household use from the full water-right process, but a well construction permit is generally still required, and in some stressed basins new domestic wells are restricted outright. The second is geologic. Drilling commonly runs on the order of twenty-five to sixty-five dollars a foot before casing, pump, and pressure tank, and depth is the variable that swings the total — neighbors half a mile apart can hit water at ninety feet and at four hundred. A completed well with a driller's log and a measured flow rate is worth considerably more than an assumption.
Power costs by the foot
Utilities typically build the first hundred to two hundred feet of a service extension at their own cost and charge for everything past it. Overhead line commonly runs in the range of five to fifteen dollars a foot and underground roughly ten to twenty-five, with poles priced separately, so a quarter mile of overhead is usually a five-figure item and a mile can approach or exceed what the land is worth. These are utility-specific figures rather than national ones, and the two numbers that decide it — the per-foot rate and the free allowance — are both set by your provider. A written line extension estimate costs nothing to request and removes the largest unknown in the valuation.
The driveway needs its own permit
Access onto a county or state road requires a permit before anyone pours a foundation, and in many counties the building department will not issue a permit until the road department has issued the access one first. That permit usually dictates the culvert: a minimum pipe diameter, an approved material, a required length, and a driveway grade that sheds water away from the roadway rather than into it. On a state highway, access management rules also control where a driveway may go at all, which occasionally means a long frontage with only one legal entry point. None of this is expensive by itself. It matters because it is a hard gate, and buyers check it.
Minimum lot size and setbacks
Zoning sets a minimum parcel size, and that decides whether ten acres is one homesite or two. It also sets setbacks from the road and from side and rear lines, while health codes add their own separations — a well and a drainfield must stay a required distance apart, and the drainfield needs a reserve area held open for a future replacement. On a narrow, steep, or heavily encumbered parcel those distances can leave a building envelope far smaller than the acreage suggests, and occasionally none at all. A buyer prices the envelope. Where the parcel can legally be split, that split potential is frequently the largest single item in the valuation.