BuildabilityWhat Is a Buildability Score™? The Complete Guide to Property Intelligence
The Buildability Score™ is a 0-100 rating that quantifies how developable any U.S. property is — nine factors from live federal and parcel data, in 20 seconds. Here's exactly how it works.
Landon Reid Founder, Buildability™Updated 8 min read
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TL;DR: A Buildability Score™ is a 0-100 rating that measures how feasible it is to build on, develop, or improve a specific property. It’s calculated by a versioned, deterministic engine (current methodology: v3) that reads nine factors, seven of them weighted into the parcel score and seismic and radon carried alongside it as regional context — zoning standards, flood, seismic, soil, radon, wildfire, utilities, terrain, and lot geometry — from live queries to federal sources (Census, FEMA, USGS, EPA, USDA, USFS, USFWS) plus parcel and zoning partners. The score replaces weeks of data gathering with a 20-second automated analysis, free on any address.
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Why We Created the Buildability Score™
The Buildability Score™ is a concept we invented at Buildability™ because nothing like it existed. There was no single number — anywhere — that told you how buildable a property was. Investors were making big decisions based on gut feel and incomplete data. Homeowners were paying architects before knowing if their lot even supported an ADU.
Every property decision starts with the same question: can I build here, and if so, what? Before Buildability™, answering that required calling the planning department, hiring a zoning consultant, waiting weeks, and still not knowing the full picture — because no single consultant checks flood zones, wildfire risk, seismic data, soil conditions, AND zoning in a single assessment.
We built the Buildability Score™ to change that. It pulls from live government APIs simultaneously and routes the reasoning to the appropriate frontier-model tier based on query complexity — all in 20 seconds. This methodology exists nowhere else. The concept, the weighting system, the regional calibration, and the data pipeline are all proprietary to Buildability™.
The Nine Factors Behind Every Score
The Buildability Score™ isn’t a black box. Methodology v3 scores nine measurable factors, each 0-100. Seven of these are weighted into the parcel score; seismic and radon are published at regional resolution and are reported alongside the score as context rather than averaged into it. The default national weights are published below; regional overrides shift them (more on that in a minute). A factor with no data drops out of the average entirely. When a source has no data for a parcel, that factor drops out of the score; when a factor's provenance is a regional estimate, it is labeled Estimated.
1. Terrain (20% default weight)
What it measures: ground slope at the lot, from USGS 3DEP elevation data.
Slope is the factor that separates a parcel from its neighbors — two adjacent lots can differ by an entire foundation budget. Flat ground scores near the top of the range; the score falls as the grade steepens, and the steepest slopes are close to unbuildable on a normal budget.
2. Zoning (16% default weight)
What it measures: the dimensional standards on record — floor area ratio (FAR), maximum lot coverage, and minimum lot size.
The engine grades the standards themselves: permissive FAR and coverage score high, acre-plus minimum lots score low. And here is the honest part — when only a designation name is known, the factor is omitted. “SF-3” is a name, not an assessment.
3. Flood (16% default weight)
What it measures: FEMA flood exposure — the flood zone, Special Flood Hazard Area status, and the share of the lot inside an SFHA.
A creek clipping one corner is not the same deal as a fully mapped floodway, so the engine scores the lot fraction when the parcel boundary is available. Zone X reads ~95; a lot fully inside an SFHA falls to ~30.
4. Soil (12% default weight)
What it measures: USDA SSURGO soil survey suitability — drainage, hydric rating, and building suitability, rolled into a 0-100 sub-score upstream.
Soil also feeds the landmine layer: a soil rated “Very limited” for septic absorption fields caps the whole score (see the worked example below).
5. Wildfire (12% default weight)
What it measures: wildfire hazard potential at the location, from the USFS Wildfire Hazard Potential map.
Very-high hazard pulls the factor to 35; unknown coverage drops the factor rather than guessing.
6. Utilities (12% default weight)
What it measures: proximity to power, water, and road infrastructure, from OpenStreetMap, as a 0-100 readiness sub-score.
v1 used to assume “serviceable” when data was missing. The engine now refuses: unknown is a finding, not a pass — the factor is excluded.
7. Lot geometry (11% default weight)
What it measures: lot shape regularity — the parcel’s area against its bounding rectangle, computed from the real parcel ring.
A clean rectangle scores ~95; a flag lot or remnant sliver falls toward 40. Like terrain, this is a within-market factor: it distinguishes lot A from lot B on the same street.
8. Seismic (regional context, no weight)
What it measures: the USGS seismic design category at the site. Low hazard reads 90; very high reads 40. It is published at regional resolution, so it sits beside the number as context rather than inside it.
9. Radon (regional context, no weight)
What it measures: the EPA county radon zone. Radon is a mitigation line item, not a deal-killer. It is published at regional resolution, so it sits beside the number as context rather than inside it.
See your full score breakdown — nine sub-scores with plain-English explanations →
Score Ranges and What They Mean
| Score | Grade | Band | What it reads |
|---|---|---|---|
| 90-100 | A+ | Excellent | Likely yes — move to deeper diligence with confidence |
| 80-89 | A / A- | Excellent | Likely yes |
| 70-79 | B+ / B | Good | Likely yes — verify the conditions flagged |
| 60-69 | B- / C+ | Good | Maybe |
| 50-59 | C / C- | Moderate | Maybe — real hurdles exist |
| 30-49 | D | Moderate/Poor | Hard to build here — understand the constraints before spending |
| 0-29 | F | Poor | Hard to build here |
These thresholds are part of the published methodology — they change only with a version bump, never silently.
The score doesn’t replace deep analysis — it tells you where to spend your time. A 78 means “worth a deeper look.” A 34 means “move on to the next deal.”
What Makes This Different: Regional Intelligence
Here’s something most people don’t know: the Buildability Score™ adjusts its factor weights in Florida, California and Texas.
Why? Because building in Florida is a fundamentally different challenge than building in California or Texas. Under methodology v3:
- Florida: flood is weighted at 25% (vs. the 16% default) because flood zones dominate feasibility decisions there.
- California: terrain rises to 25%, zoning to 22% and wildfire to 20%, because hillsides, zoning and WUI exposure are the constraints that actually kill projects.
- Texas: utilities are weighted at 24% (vs. the 12% default) because many properties sit in unincorporated areas with no municipal services.
This means a score of 72 in Miami accounts for very different risks than a 72 in Austin or a 72 in San Francisco. The overrides are part of the published, versioned methodology — not a hidden dial.
A Worked Example: Strong Land, Capped at 60
Take a lot that scores well on everything a listing shows: no part of it in a mapped SFHA, nearly flat ground, a clean rectangular shape, utilities close by. A naive weighted average would land high.
Now suppose USDA rates its soil “Very limited” for septic absorption fields, and the lot sits off an established street grid (fewer than four mapped streets within 250 m). If it has no sewer service, a standard septic system likely fails there — an engineered system can cost tens of thousands more, and a failed perc test can kill a build outright. So the Buildability Formula caps the published score at 60 instead of letting a strong average bury the finding:
Score = min(composite, every landmine cap) — and the cap shows up as a named banner in the report, with its source cited.
On an established street grid the same rating does not cap the score: the lot is most likely on a sewer main, so the report holds the cap back and says so — sewer assumed, not confirmed.
That is the design philosophy in one example: the score exists to surface the thing that changes your decision, not to flatter the land.
The Data Behind the Score
The Buildability Score™ isn’t an opinion — it’s calculated from government and commercial data sources queried live when a fresh report runs (successful lookups are cached server-side for up to 7 days so repeat lookups are instant):
| Source | What It Provides |
|---|---|
| Census Bureau | Geocoding, boundaries, demographics |
| FEMA | Flood zone designation and SFHA status |
| USGS | Seismic hazard and 3DEP terrain/slope |
| EPA | Radon zones and community water systems |
| USDA | SSURGO soil surveys and suitability ratings |
| USFS | Wildfire hazard potential |
| USFWS | National Wetlands Inventory (a mapped wetland caps the score) |
| OpenStreetMap | Utility and road infrastructure proximity |
| Regrid | Parcel boundaries, APN, ownership |
| RentCast | Valuation and rent estimates (report context) |
| Municipal records | Zoning designations and dimensional standards |
One thing worth being precise about: the score itself is deterministic — there is no AI inside the math. The same inputs produce the same number, forever, and every methodology version is frozen once published. Frontier LLMs power the explanation layer — Geo, the agent that walks you through why a parcel scores what it does — not the scoring.
High Score vs. Low Score: What the Difference Looks Like in Practice
The score isn’t abstract — it directly changes what you do with a property. Here’s a side-by-side:
| Property A: strong score | Property B: weak score | |
|---|---|---|
| Zoning | Permissive FAR and coverage on record | Acre-minimum lot rules, standards unknown in county GIS |
| Flood | Zone X, no SFHA overlap | Large share of the lot inside Zone AE |
| Utilities | Power, water, road all mapped nearby | Nearest mapped infrastructure far away — factor drops out |
| Terrain | Near-flat grade | Steep slope across the buildable area |
| Lot geometry | Clean rectangle | Narrow flag lot |
| Your decision | Make the offer. Budget standard permitting. | Walk away, or price the constraints in from day one. |
This is why the score matters more than raw data. Property B might look buildable from a listing photo. The factor breakdown tells you it isn’t — before you spend a dollar.
How to Read and Interpret Your Score
When you get your Buildability Score™, don’t just look at the number — look at the factor breakdown. The total score is a screening tool, but the sub-scores tell you why.
If zoning is the lowest score — the dimensional standards on record are restrictive for what you want to build. You may need a variance, rezone, or conditional use permit — the most expensive kind of fix.
If flood, wildfire, seismic, or radon is the lowest — there are natural-hazard costs to price in. Some are manageable (radon mitigation, flood insurance); some reshape the whole build (elevation requirements in an SFHA). The report names the dataset behind each so you can verify.
If utilities is the lowest — or missing — mapped infrastructure is thin. Extending a sewer or power line can be a five-figure line item, and the engine deliberately refuses to assume serviceability when the data isn’t there.
If terrain or lot geometry is the lowest — the physical lot is the constraint: slope drives grading and foundation cost, and irregular shape eats the buildable envelope after setbacks.
If a landmine banner appears — read it first. A cap (like septic-limiting soil) is the engine telling you the average doesn’t matter until this one finding is resolved.
Pro tip: Two properties can have the same total score for completely different reasons. A 65 with strong zoning but high flood exposure is a fundamentally different opportunity than a 65 with clean hazards but steep ground. Always check the factors.
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Limitations (We're Transparent About What the Score Can't Do)
The Buildability Score™ is a screening tool, not a permit guarantee. It can't:
- Replace a site-specific survey or geotechnical report
- Predict how long your specific jurisdiction's permitting process will take
- Account for upcoming zoning changes that haven't been publicly recorded
- Replace legal advice for complex entitlement or variance work
One more honest note: our Austin backtest (76 built vs 369 never-built parcels, public data) validated methodology v1 at AUC 0.741. Re-scored on the same parcels, the current v3 engine reads AUC 0.711 — the full test design, results, and limitations live on the Accuracy page.
What it can do is tell you in 20 seconds whether a property is worth the deeper analysis — and exactly where to focus your attention. That's the difference between paying a consultant for every property and paying one only for the properties that score high enough to warrant it.
Ready to know your property's score? Try Buildability™ free — no signup required →
Related Questions
- What Is Zoning and Why Does It Matter?
- Can I Build an ADU on My Property?
- How Do Environmental Restrictions Affect Property Value?
- How Do I Find Properties Zoned for My Project Type? (coming soon)