⚑ Bedrock within ~0 cm of the surface · caps this score at 70
Shallow bedrock means blasting or rock excavation for foundations, utilities, and any septic field — a cost multiplier the listing photos never show. A geotechnical bore confirms depth at the build site. (USDA SSURGO (brockdepmin))
⚑ Sewer service assumed, not confirmed
This soil is rated "Very limited" for septic, and the septic warning is being held back only because the lot sits on an established street grid — which suggests a sewer main but does not prove one. Nothing here establishes service, connection rights, capacity, or a will-serve commitment. Confirm with the utility before you rely on it; if there is no sewer, the septic constraint applies in full. (USDA SSURGO (engstafdcd) + OpenStreetMap street density)
Zoning coverage: Reading this jurisdiction's own zoning code now — refresh in a few minutes and the standards for A70-AR(L -D(- -LOT(8AC -BT(C -MFAR(- -FAR(- -H(G -COV(- -SB(C -OS(- -SR(- will appear here.
Each factor is scored 0–100. Higher means fewer constraints.
| Zoning | — | not on record | no data |
| Flood | 95 | Minimal risk | FEMA NFHL |
| Seismic | 55 | Moderate risk | USGS Seismic |
| Soil | 62 | Limited | USDA SSURGO |
| Radon | — | not on record | no data |
| Wildfire | 70 | Low risk | USFS WHP |
| Utilities | 83 | Mapped close by | OSM Overpass |
| Terrain | 93 | Near flat | USGS 3DEP |
| Lot shape | 93 | Regular lot | Buildability engine |
Computed live from public federal sources by the Buildability Score engine (current methodology: v2) — deterministic and reproducible, not asserted. Generated October 5, 2026. Data sources · Accuracy
Informational only — not a permit, appraisal, or professional engineering opinion. Verify with your local planning department before acting on it. See Terms and data sources.
6465 RAINBOW HEIGHTS RD, FALLBROOK, CA, 92028 carries a Buildability Score of 70 out of 100 (grade B). The score is composed from 6 weighted factors — each cited to its federal or jurisdictional source and re-runnable live on this page.
Grade B reads as a strong build site with minor standing constraints. The grade is derived from the numeric score (70/100) on the published Buildability™ scale.
The weakest factor at this address is seismic — scored 55 out of 100, which reads as moderate risk (every factor is scored so that higher means fewer constraints). That's the factor most likely to constrain what a design can carry, and the one to inspect first before committing capital.
Flood scores 95 out of 100 — minimal risk, and the highest of the 7 factors read for this address. Higher scores mean fewer constraints, not more.
Every factor cites the federal or jurisdictional dataset it came from — FEMA (flood), USGS (seismic), USFS (wildfire), EPA (radon), USDA/NRCS (soil), and the local jurisdiction's own zoning record where available. Sources are queried live and re-run on refresh; the score cannot outrun its data.
When San Diego County, CA's zoning record is on our roster, the score reads the jurisdiction's own dimensional standards for the district this parcel sits in. When it isn't, the zoning factor drops out rather than being estimated — which is why parcels in un-rostered jurisdictions still return a score, just one that doesn't count zoning.
No. The Buildability Score™ is a preliminary due-diligence read, not an entitlement or permit approval. Governing bodies retain sole authority over binding land-use decisions. The score's role is to make the diligence conversation faster and better-grounded, not to replace it.