What every section documents, how freeboard translates to real premium dollars, why the datum on your EC has to match your FIRM, how to spot an outdated or incorrectly prepared EC — and when getting one actually helps versus when it won't move the needle.
An Elevation Certificate (EC) is a standardized FEMA form — Form 086-0-33 — completed by a licensed land surveyor, engineer, or architect that documents the elevation of a building relative to the Base Flood Elevation and other flood-relevant reference points. It is the official document FEMA accepts for flood insurance rating and map amendment purposes.
An EC is a survey product — it records what a licensed professional measured at your property. It is not an assessment, an opinion, or a recommendation. It doesn't tell you whether your flood zone is correct. It doesn't guarantee lower premiums. It doesn't by itself remove you from the SFHA. What it does is document the physical relationship between your building and the mapped flood elevation with professional certification — which then enables the processes that can change your insurance cost or your zone classification.
Common misconception: Many property owners believe obtaining an EC will automatically lower their premium. An EC lowers premiums only if the building's elevation data is more favorable than FEMA's alternative data source currently used for your property. If your building is below BFE, an EC will confirm that — and may actually clarify why your premium is high, without reducing it.
An EC is required or strongly beneficial in several situations:
Only a licensed land surveyor, civil engineer, or registered architect authorized under state law to certify elevation information can prepare an EC. The professional's seal, signature, and certification on the form is what gives it standing with FEMA and insurance underwriters.
Property owners cannot self-certify. Neither can real estate agents, insurance agents, or appraisers — even those with significant flood knowledge. The certification is specifically a professional survey or engineering certification, and the regulatory system requires it.
When selecting a professional, look for surveyors or engineers with specific experience in LOMA applications and flood insurance ECs — not just general survey work. Flood EC preparation has specific FEMA requirements for how elevations are documented and certified that differ from standard property surveys.
Documents the property address, legal description, latitude/longitude, FIRM community number, map panel and suffix, FIRM effective/revised date, and the flood zone designation. This section establishes the regulatory context — which FIRM the property appears on, what zone it's in, and the BFE that applies. Verify the panel number and zone designation here — errors in Section A propagate through the rest of the form.
Documents the BFE at the property location, the source of the BFE (FIS profile, FIRM, or other), and whether the BFE is expressed in NAVD 88 or NGVD 29. This section also identifies whether the property is in the floodway and records CBRS (Coastal Barrier Resources System) information. The BFE value here is the reference against which your building's elevation is compared — verify it matches the FIS floodway data table for your reach.
Documents the elevation of the lowest floor, the lowest adjacent grade, the highest adjacent grade, and other key building elevations. For elevated structures, documents the bottom of the lowest horizontal structural member. For enclosures, documents the enclosure floor elevation. This section's data directly determines NFIP rating and LOMA eligibility. Every field in Section C should be surveyed — not estimated or assumed.
The certifier's name, license number, state, signature, date, and professional seal. This is what makes the EC a legal document rather than a worksheet. An EC without a current, valid certification is not acceptable to FEMA for rating or LOMA purposes. Check the certification date — if it predates a significant map revision in your area, it may reference a BFE that has since changed.
Translates Section C data into the specific format NFIP underwriters use for rating. Documents the building's lowest floor elevation relative to BFE (the "freeboard"), enclosure and crawlspace information including flood opening area, and machinery/equipment location. Insurance adjusters and NFIP raters work primarily from Section E data.
Used in limited circumstances where a professional survey cannot be obtained — primarily for post-disaster emergency rating. For standard NFIP rating and LOMA applications, Section F is not a substitute for Sections C/D professional certification.
Section G identifies the building diagram type (FEMA provides standardized diagrams for different foundation and structure types — slab, raised, pier, etc.). The diagram type affects how FEMA interprets the elevation data. Section H provides photographs from all four sides and the street. Photos document the structure as surveyed and are used in claims and LOMA review.
The BFE at your property from the FIRM. Every other elevation on the EC is compared against this number. Verify it matches the FIS floodway data table — occasional errors in Section B occur.
The top of the lowest floor of the structure — the slab for slab foundations, the first floor for elevated structures without enclosed space below. For structures with basements, the basement floor elevation. This minus B9 gives you your freeboard.
The natural ground surface at the lowest point immediately adjacent to the building. This is what FEMA uses for structure-based LOMA eligibility — if it's at or above BFE, you likely qualify. Different from the lowest floor; a building can be below BFE but have adjacent grade above BFE if the site slopes.
The difference between your lowest floor and the BFE. Positive = above BFE (favorable). Negative = below BFE. This single number most directly determines premium under NFIP and eligibility for a LOMA. Every additional foot of freeboard typically reduces NFIP premium meaningfully.
For structures with enclosures below BFE, the area of flood openings (vents) relative to the enclosed area determines whether the enclosure is treated as a basement (no openings) or a vented enclosure (different rating). Insufficient flood vent area is a common rating problem.
Freeboard is the distance your lowest floor sits above the BFE. Under the old NFIP rating system, each additional foot of freeboard produced a predictable premium reduction. Under Risk Rating 2.0, the relationship is more complex — elevation is one of multiple factors — but freeboard remains one of the most influential variables in NFIP pricing.
These are representative NFIP annual premium ranges by freeboard position for a single-family home in Zone AE with $250,000 building / $100,000 contents coverage. Actual premiums vary by replacement cost value, flood type, distance to water, and other Risk Rating 2.0 factors:
| Freeboard Position | Relative to BFE | Typical NFIP Annual Range | LOMA Eligible? |
|---|---|---|---|
| +3 ft or more | 3+ feet above BFE | $400 – $900 | Yes — strong candidate |
| +2 ft | 2 feet above BFE | $600 – $1,400 | Yes — solid candidate |
| +1 ft | 1 foot above BFE | $900 – $2,200 | Yes — depending on LAG |
| At BFE (0) | At BFE | $1,500 – $3,500 | Borderline — LAG critical |
| -1 ft | 1 foot below BFE | $2,500 – $5,500 | No |
| -2 ft | 2 feet below BFE | $3,500 – $8,000 | No |
| -3 ft or more | 3+ feet below BFE | $5,000 – $12,000+ | No |
Ranges are illustrative estimates based on NFIP program data. Actual premiums depend on Risk Rating 2.0 factors including replacement cost value, flood type, distance to nearest flooding source, foundation type, and community CRS discount. Higher-value homes pay proportionally more. These ranges assume average conditions — coastal V zone premiums are typically higher throughout.
The practical takeaway: moving from -1 ft below BFE to BFE by elevating a structure eliminates roughly $1,000–$2,000 in annual premium for a typical residential structure — and at BFE, LOMA eligibility becomes a question depending on the lowest adjacent grade. Moving from BFE to +2 ft reduces premium by another $1,000–$2,000 and strongly supports LOMA eligibility.
Before Risk Rating 2.0, obtaining an Elevation Certificate was essentially mandatory for any NFIP policyholder in Zone AE who wanted accurate rating — the EC data was the primary input to the premium calculation. Without it, FEMA used conservative assumed elevations that were often less favorable than reality.
Under Risk Rating 2.0, FEMA shifted to using proprietary alternative elevation data sources — lidar-based terrain models, remotely sensed structure height data, and other inputs — to rate policies without requiring an EC. NFIP no longer requires an EC for rating in most cases.
This doesn't mean ECs are worthless — it changes how they're used:
The EC investment question under RR2.0: Before paying for an EC, request a copy of FEMA's flood risk assessment for your property — available through your insurance agent or NFIP directly. This shows the elevation data FEMA is using to rate your policy. If it appears inaccurate or less favorable than likely reality, an EC is worth pursuing. If FEMA's data already reflects your building's actual elevation reasonably well, the premium benefit of an EC may be minimal.
Private flood insurers use their own risk models and underwriting criteria. Some require an EC; many use proprietary elevation data and don't. But a favorable EC can influence private market pricing in several ways:
Always submit a current, favorable EC to private flood insurers when shopping for quotes. It rarely hurts and sometimes helps significantly.
For LOMA applications, the EC must meet specific requirements beyond standard rating use:
For eLOMA applications submitted through FEMA's electronic portal, the surveyor submits the EC data directly — the portal validates completeness before submission. For MT-1 paper applications, the EC is included in the application package.
Communities require an EC for new construction in the SFHA as a condition of a building permit or certificate of occupancy. For new construction, ECs are sometimes prepared in two phases: a pre-construction EC documenting the natural ground elevations before grading, and a post-construction EC documenting the as-built lowest floor elevation for the final permit. The post-construction EC becomes the building's official EC record and is used for insurance and any future LOMA applications.
For new construction above BFE, the builder or developer typically obtains the EC as part of the construction documentation package. Buyers of newly built homes in flood zones should request a copy of the as-built EC at closing — it's often available but not always proactively provided.
For existing structures without a prior EC, the survey requires more work than new construction — the surveyor must establish existing grade elevations, measure the as-built structure, and document the relationship between the building and the current FIRM BFE. This may require more time and cost than a post-construction EC for a new build, particularly for older structures with complex foundation configurations or limited survey access.
The datum discrepancy between NAVD 88 and NGVD 29 is the single most common source of EC errors that affect LOMA applications and premium calculations. Here's what you need to know:
In most of the continental United States, NAVD 88 reports lower elevations than NGVD 29 for the same physical point — typically by 0.5 to 1.5 feet depending on location. In some coastal and Gulf Coast areas, the difference can be larger. The National Geodetic Survey (NGS) VERTCON tool allows conversion between the two datums for any location.
The datum is stated on the FIRM panel — look in the map legend or map title block for "NAVD 88" or "NGVD 29." Your EC's Section B should document the datum used. If both say the same thing, the comparison is valid. If they differ, conversion is required.
A property with a lowest floor surveyed at elevation 45.2 ft NAVD 88 and a FIRM BFE of 46.0 ft NGVD 29 might appear to be 0.8 feet below BFE — when in fact, after conversion (adding ~0.9 ft for a Gulf Coast location), the corrected elevation would be approximately 46.1 ft NAVD 88 equivalent, placing the building 0.1 ft above BFE. The datum error turned an apparent ineligible property into a LOMA-eligible one. FEMA will make this correction during review, but catching it before submission prevents delays.
Not all ECs on file are accurate or current. Red flags that an existing EC may need updating or verification:
Step 1: Check if one already exists. Contact your community's floodplain management office or building department. Many communities maintain EC records for properties that required one as a permit condition. Ask for any EC on file for your address. Also check with previous owners — ECs are sometimes included in closing documents and can be found in title records.
Step 2: If you need a new EC, shop surveyors. Contact at least 2–3 licensed land surveyors in your area. Questions to ask before hiring:
Typical costs: $500–$800 for a straightforward single-family residential EC in most markets. $800–$1,500 for complex properties, hard-to-access sites, or markets with higher surveying costs. LOMA application filing by the surveyor (if offered) typically adds $150–$400.
This is exactly the analysis a Property Analysis or Comprehensive Review provides before you spend $800 on a survey — assessing your likely elevation relative to BFE from available public data, so you know whether the EC investment makes sense before committing.
A survey costs $500–$1,500. If your building is clearly below BFE, an EC confirms the problem without solving it. If you're above BFE, it may cut your premium significantly or open a LOMA pathway worth thousands per year. A Property Analysis assesses your likely elevation from public data first — so you're not spending $1,000 to discover an outcome you could have anticipated.
Analysis includes EC status check, BFE relationship assessment, and guidance on whether obtaining a survey is likely to be beneficial for your situation.
Every LOMA requires an EC — and foundation type determines which elevation FEMA uses.
Where the BFE your EC is compared against comes from — and how reliable it is.
How EC data is used in NFIP rating and the private market.