Elevation Lookup by Address
Pull mean, minimum, and maximum elevation across any parcel polygon from USGS 3DEP.
Parcel-Level Elevation & Slope
We sample USGS elevation across the parcel polygon, compute mean, max, and average slope percentage, and classify the lot into one of five buildability tiers — flat, gentle, moderate, steep, severe — so the topography is a usable number, not a contour line.
Grading Cost & Cut/Fill Estimates
Slope drives grading. We translate average slope and parcel area into cut/fill cubic yardage and a grading cost band — usually the largest hidden line item on sloped lots.
Foundation Type Implications
Flat lots accept slab-on-grade; moderate slopes push to stem-wall; severe slopes require piers, retaining walls, or daylight basements. We name the likely foundation system and its cost premium up front.
Net Buildable Area
Steep portions of a parcel are effectively unbuildable without major engineering. We compute the slope-adjusted buildable footprint so site plan and unit count assumptions match physical reality.
Frequently Asked Questions
- Where does Buildora IQ's elevation data come from?
- USGS 3D Elevation Program (3DEP) — the federal source civil engineers rely on. We sample across the parcel polygon, not a single map pin.
- Can I trust the slope number for underwriting?
- Yes — we compute slope from the elevation grid across the parcel, then classify it with a conservative 5-tier system so you don't under-budget grading and foundation work.
- Does this replace a civil engineering report?
- No. Our topography report is for pre-offer feasibility and underwriting. A stamped civil engineering survey is still required for permits and final design.
- How does slope change construction cost?
- Sloped lots add grading, retaining walls, drainage, and a more expensive foundation system. The premium can run 10–35% of base build cost — we surface it before you commit.
- What does a report cost?
- $69 Homeowner Pack, with Builder and Investor subscriptions for higher-volume workflows.
- Can I analyze rural / large acreage parcels?
- Yes. Acreage parcels are where slope analysis pays off most — we sample the full polygon and surface the buildable envelope inside the larger lot.
Related Resources
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