Raising a building entry sounds like a small job. Add a few steps, pour a landing, and maybe build a ramp. Then the ramp runs into the sidewalk, the steps don’t meet the door, or rain starts pooling against the new slab.

A topographic survey prevents most of these problems. It measures the heights of the floor, the ground, and everything around the entrance. Owners, designers, and contractors can then plan an entry that fits the site before any concrete is poured.

Measure Existing Entry and Finished Floor Elevations

Start with the elevations around the entrance. The floor elevation refers to the elevation of the building’s main floor, while measurements at the door threshold, existing landing, and surrounding ground help show how the entrance fits the site 

These heights should be tied to a known reference point called a benchmark. That lets the designer compare them with flood maps, city plans, and future work. Heights taken with a tape measure or a phone app can’t do that.

If the entry is being raised to a new floor height, the survey shows exactly how far up you’re going. That rise drives almost every other choice, from the number of steps to the length of any ramp. Get this number right first.

Map Grade Changes Around the Proposed Raised Entrance

Next, map the ground around the entrance. Grade is the height and slope of the ground surface. A raised entry has to meet that ground in every direction.

Ask the surveyor to cover a wide enough area. Include the sidewalk, parking spaces, driveway, planters, and any nearby walls or columns. A ramp may need far more room than the old entrance did, so the survey should reach well past the door.

Small grade changes matter here. The sidewalk may slope toward the street, and the parking lot may slope toward a drain. The survey shows these patterns so the new entry can tie in without awkward bumps or trip points.

Coordinate Ramps, Steps, and Walkways With Site Elevations

The entry design has to connect the raised floor to the ground at a safe, usable slope. Steps, ramps, landings, and walkways each have limits on how steep or how tall they can be. The survey gives the designer real heights to work within.

Ramps take the most space. Under ADA standards, many ramps can rise no more than one inch for every 12 inches of length, with level landings along the way. A two-foot rise can call for a long ramp, and the survey shows whether the site has room. Which rules apply depends on the building’s type and use, so confirm them with your designer and building department.

Steps have their own rules for riser height and tread depth. Walkways and landings need to line up with doors and existing paths. Mapping all of these on one drawing helps the team spot conflicts early.

Check Drainage Paths Before Raising the Building Entry

A new raised entry can change how water moves around the building. Slabs, ramps, and walls can block a path water used to follow. Water that once ran away from the door may start pooling next to the new landing.

The topographic survey shows existing drainage paths around the entrance. It maps low spots, drains, gutters, and the slope of paved areas near the entrance. The designer can then shape the new entry so water drains away from the building.

Ask the surveyor to locate drain inlets, downspouts, and any pipes near the work area. Heights on drain grates and pipe ends help the designer plan tie-ins. On flood-prone sites, this step deserves extra attention.

Use Survey Data to Finalize Entry Design Details

Use the survey as the base drawing for the final entry plan. The architect or engineer can set new floor, landing, and ramp heights right on it. Contractors then build from those numbers instead of guesses.

Many permits for entry changes ask for a site plan with elevations. Needs vary by city, building type, and project scope, so ask the building department what they want. If a permit or construction date depends on the survey, order it early.

Some owners have the surveyor check key heights after the forms are set and before concrete goes in. It’s a quick visit. It can catch a mistake while it’s still cheap to fix.

A raised entry works only if it fits the floor, the ground, and the water around it. A topographic survey gives your team the heights they need to design steps, ramps, and landings that match the site. If you’re planning to raise a building entrance, talk with a local licensed surveyor early so the design starts with solid numbers.

Frequently Asked Questions

What does a topographic survey show for an entry project?

It shows the heights of the floor, door threshold, ground, sidewalks, and paved areas near the entrance. It also maps features like drains, walls, planters, and utilities. All heights are tied to a known reference point. Designers use this data to plan steps, ramps, and drainage.

Why can’t my contractor just measure the heights?

A contractor can take quick measurements, but they may not be tied to a fixed reference. That makes it hard to compare them with flood data or city plans. A surveyor also maps a wider area in more detail. That extra detail often prevents costly redesigns.

How much room does a ramp need?

It depends on how high the entry sits and which rules apply. Accessibility standards limit how steep a ramp can be and may require landings. A higher entry needs a longer ramp. The survey shows whether your site has the space.

Do I need a permit to raise a building entry?

Many projects that change entries, steps, or ramps need a permit. Rules can vary by city, building type, and project scope. The permit office may ask for a site plan or survey with elevations. Check early so the survey matches what they need.

How long does a topographic survey take for a small entry area?

Field work for a small area often takes a few hours. Drafting the drawing usually takes a few more days. Timing depends on site size, the detail needed, and the surveyor’s schedule. Book it before design starts to avoid delays.

For a free land surveying quote, call us at (954) 516-2680 or send us a message by going here.

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