How to Review an ALTA Survey for Site Design
A design team that skips a careful ALTA survey review often finds out too late that the plan does not match the real site. A tree line might sit in a different spot. A utility easement might cut through the planned building. A setback line might sit closer than expected. By the time someone spots these problems, the design has already moved too far to fix them easily.
An ALTA survey gives engineers, architects, and developers a clear picture of a property. It shows boundaries, existing improvements, easements, and other details that affect how a site can be built. Reviewing this survey the right way, before design starts, is one of the best ways to keep a project on track and avoid rework.
Confirm the ALTA Survey Is Design-Ready
Before a team starts designing from an ALTA survey, someone needs to check that the survey is ready to use. Not every survey is new enough, detailed enough, or scoped the right way for design work.
Start with the survey date. Site conditions change over time. An old survey may not show recent grading, new utility lines, torn-down structures, or new zoning setbacks. If there is any doubt, ask the surveyor if an update makes sense before design moves forward.
Next, check which Table A items were part of the survey. ALTA surveys have a base set of requirements, but Table A items add extra details. These can include utility locations, zoning information, or flood zone data. If the survey is missing an item your design needs, the team will have to guess or dig for that information somewhere else. That usually slows things down.
Last, look at the certification. This part of the survey says who the surveyor prepared it for and what the surveyor stands behind. If your design team is not named on the certification, it is worth checking whether that matters for your project.
Align the Concept Plan With the Survey Base
Once you know the survey is ready, the next step is lining up the concept plan with the real survey base. Do not rely on guesses or older reference drawings.
Start by matching the datum used on the survey with the datum your design team is using. This covers both the horizontal and vertical reference points. A mismatch here can throw off elevations and grading, and this problem can go unnoticed until much later.
Next, place the concept plan directly on top of the survey instead of comparing them by eye. This step often shows conflicts that were not obvious before. A building footprint might cross an easement line. A parking layout might not leave enough space for a required buffer.
Also check that boundary lines, right-of-way lines, and any easements on the survey match what your team has been using. If an older site plan used different boundary details, sort that out before the design moves any further.
Test Site Functions Against Mapped Constraints
An ALTA survey shows more than lines and boundaries. It also shows limits that affect how the site will actually work, and the design needs to be tested against those limits directly.
Check drainage patterns on the survey against your grading plan. If the survey shows water flow paths or low spots, your design needs to account for where that water goes once the site is built.
Check access points, driveways, and any recorded access easements against your traffic and circulation plan. A conflict here can affect fire access, deliveries, or how parking works once the site is finished.
Check utility locations and any related easements against your building layout, underground lines, and landscaping plan. Utilities are one of the most common causes of late design changes because they get overlooked until construction drawings are already underway.
Separate Surveyed Facts From Design Assumptions
One of the most useful habits a design team can build is keeping a clear line between what the survey actually shows and what the team is assuming.
Surveyed facts come from real measurements. This includes boundary lines, existing improvements, recorded easements, and features found in the field. Design assumptions are anything the team is estimating or carrying over from an older drawing because the survey did not cover it.
Mixing these two things together is where problems often start. A team may think a measurement came from the survey when it actually came from an old plan. That means the design could be built around information that was never checked.
Keep a simple list of what the survey confirms and what is still an assumption. This gives the team something clear to check as the design moves forward. It also makes it much easier to catch a mistake before it turns into an expensive one.
Resolve Survey Questions Before Design Milestones
Any questions that come up during your review should be answered before the project hits its next design milestone, not after.
If something on the survey looks unclear, such as an easement with no stated purpose or a boundary line that does not match nearby property records, send that question to the surveyor early. Waiting until permitting or construction drawings are further along only makes the fix harder.
The same goes for missing Table A items. It is much easier to request an update before the concept plan is locked in than after the design has already been built around missing information.
Set a simple checkpoint where your team confirms all open survey questions are answered before moving to the next phase. This small habit helps stop minor issues from turning into bigger schedule problems later.
