Water sheets toward the front door every time it rains. Customers step carefully on a steep ramp, and delivery trucks scrape their bumpers at the driveway apron. These are common signs that a commercial entrance needs regrading, and they’re all problems that started with elevations.

An elevation survey measures the height of the ground and pavement at many points across a site. Before you tear up asphalt or pour new concrete, that data shows exactly how the entrance slopes today and where water goes. Property owners who skip this step often pay for regrading that looks better but drains no better. Get the survey done first, and let the numbers guide the design.

Why Elevation Data Matters Before Entrance Regrading

Regrading changes how the ground slopes, and small changes carry big effects. A shift of an inch or two can send water toward a doorway instead of away from it. Without measured elevations, your contractor is working from guesses and eyeballed slopes.

Elevation data also protects you from surprises. Entrances often connect to public sidewalks, curbs, and streets that you can’t change. Your new grades have to meet those fixed heights cleanly. An elevation survey records them before design starts, so the plan fits the site as it really is.

Accessibility is another reason to measure first. Walkways, ramps, and parking areas used by the public often have slope limits under accessibility standards and local codes. Your engineer or designer can confirm which limits apply to your property, but they’ll need accurate existing grades to do that work well.

Measuring Existing Grades Across the Commercial Entrance

A surveyor measures existing grades by collecting spot elevations across the entrance area. A spot elevation is simply the height of one point compared to a fixed reference, called a benchmark. The surveyor gathers enough points to show high spots, low spots, and every change in slope.

On a typical commercial entrance, the survey may pick up:

• Door thresholds and finished floor heights
• Sidewalk edges, curbs, and gutter lines
• Driveway aprons and pavement joints
• Ramps, steps, and landings
• Storm inlets, grates, and their rim and pipe heights

Ask your surveyor how far past the entrance they’ll measure. Water rarely stops at a property line or a parking stripe. Capturing the nearby parking lot, drive lanes, and street edge gives the designer a full picture of where runoff comes from and where it can go.

Evaluating Drainage Around Pavement and Access Points

Drainage problems are the most common reason owners regrade an entrance. The elevation survey shows the direction and steepness of each slope, which tells you how water moves across the pavement. Low areas where water ponds become obvious once the points are mapped.

Look closely at the spots where different surfaces meet. The seam between a sidewalk and a parking lot, or between a driveway apron and the street, often traps water. Heaved or sunken concrete panels can create small dams that hold water against the building. Freeze and thaw cycles make these spots worse each winter as trapped water expands.

Storm structures deserve attention too. An inlet that sits higher than the pavement around it can’t catch water. Your surveyor can record rim heights and, where accessible, pipe depths, so the designer knows whether existing drains can handle the new layout. Some sites may also have drainage easements or stormwater rules that affect what you can change, and those can vary by municipality.

Using Elevation Survey Data to Plan New Grades

Your engineer or site designer uses the elevation survey to build a grading plan. A grading plan shows the proposed height of the finished surface at key points, plus the slopes between them. Good plans direct water away from doors, toward inlets or swales, and off the walking path.

The survey helps the designer balance goals that sometimes compete. A gentle ramp may need more length, and more length may push into a parking space or drive lane. Raising pavement at the door may create a steep drop at the street. Accurate existing grades let the designer test options on paper before any crew arrives.

Before you approve the plan, ask a few practical questions:

• Do new grades tie into the sidewalk, curb, and street at their existing heights?
• Will the entrance stay open during work, and how will phases be staged?
• Does the city or county require a permit or plan review for this scope?

Permit rules vary by municipality and project size. Confirm them early so review time doesn’t hold up construction.

Verifying Finished Elevations After Regrading

Once the new pavement or concrete is in place, measure it again. A post-construction elevation check compares finished grades to the approved grading plan. It confirms that slopes, ramps, and drainage paths turned out the way they were designed.

This step catches problems while the contractor is still on site. A low spot of half an inch can be hard to see on a dry day but obvious after the first storm. Fixing it before final payment is much easier than calling a crew back months later.

Some owners also need finished elevations for records, permit closeout, or future work. Requirements can vary by municipality, lender, and project scope. Keep the final survey with your property files, because it will save time on the next repair or tenant improvement.