Survey Types
Elevation Certificate
The FEMA form that can be the difference between a fair flood insurance premium and a punishing one.
An elevation certificate is a standardized FEMA form completed by a licensed surveyor. It records the elevation of specific parts of a building and compares them to the base flood elevation for that location. Insurers and floodplain administrators use it to decide what your building’s actual flood risk is.
Why it matters in Tulsa
Tulsa sits on the Arkansas River, and the metro carries a lot of mapped floodplain along the river and its tributary creeks. Flood mapping also gets revised over time, which means a property that was outside a special flood hazard area when it was built can end up inside one after a map update, or the reverse.
Being mapped into a flood zone triggers a mandatory insurance requirement if you have a federally backed mortgage. The mapping is done at a broad scale, though, and it does not know that your house sits on a rise four feet above the street. An elevation certificate is how you put that fact on the record.
When you need one
- Your lender or insurer is requiring it because the property is in a mapped flood zone
- Your flood premium looks far too high for a structure that clearly sits high
- You are building new or substantially improving a structure in a floodplain and the city requires it
- You want to apply for a Letter of Map Amendment to get the property removed from the flood zone
- You are buying and want to know the real exposure before closing
What the surveyor measures
The form asks for elevations at specific points, and which ones apply depends on the building type and the flood zone. Common items include the top of the bottom floor, the top of the next higher floor, the lowest elevation of any machinery servicing the building such as an outdoor HVAC unit, the lowest adjacent grade next to the structure, and the highest adjacent grade.
That machinery line catches people. An air conditioner condenser sitting low on a slab can drag the rated elevation down and cost real money every year, and it is sometimes fixable by raising the unit.
A Letter of Map Amendment is the payoff worth asking about. If the certificate shows your structure sits above the base flood elevation, you may be able to petition FEMA to amend the map for your property. Success removes the mandatory insurance requirement. Ask your surveyor whether your numbers make you a realistic candidate before you spend the effort.
What it costs and how long it takes
Elevation certificates are among the cheaper survey products because the scope is narrow and defined. Cost rises if the benchmark network nearby is poor, if the structure is complex, or if the surveyor has to establish vertical control from a distance. Turnaround is usually days rather than weeks.
Things that trip people up
- An old certificate on an outdated form may not be accepted, and mapping may have changed since
- The certificate documents the building as it exists, so finish the construction first
- It is not a flood determination and it is not a boundary survey
- Your insurer, not the surveyor, decides what the numbers do to your premium