When a building project is finished, the actual work on the ground does not always match the original plans exactly. Small changes happen along the way. A wall may shift a few inches. A utility line gets rerouted. The grading gets adjusted in the field. An as-built survey captures all of those changes and creates an official record of what was actually built.

Think of it this way. A design plan shows what a project is supposed to look like before work begins. An as-built survey shows what it actually looks like after the work is done. One is the plan. The other is the proof.

What Does an As-Built Survey Record?

An as-built survey records the exact location and size of everything that was built on a property. The specific items depend on the type of project, but most as-built surveys include:

• The position of buildings and structures on the lot
• Foundation dimensions and finished floor elevations
• The location of driveways, parking areas, and walkways
• Underground utility lines such as water, sewer, gas, and electrical conduits
• Stormwater pipes, drainage inlets, and retention areas
• Retaining walls, fences, and other site improvements
• Final ground elevations around structures

For commercial and civil projects, this documentation can be very detailed. It may include hundreds of data points showing the exact depth and position of every buried utility line on the property.

When Do You Need an As-Built Survey?

You need an as-built survey after construction is finished on any project that requires a building permit or engineering plans. It is commonly required by local governments, lenders, and utility companies before a project can be officially closed out.

After New Construction

Most local governments require an as-built survey before they will issue a certificate of occupancy. This is the official document that allows a building to be used or lived in. Without it, the project cannot be legally occupied, no matter how well the work was done.

For Permit and Code Sign-Off

Building departments use as-built surveys to confirm that what was built matches the approved plans. If changes were made during construction, those changes need to be on record. An as-built survey is the official proof that the finished work meets local codes.

Before Renovations or Additions

If you want to add on to a building or make major changes to a property, your contractor and engineer need accurate records of what is already there. Older properties often do not have reliable documents on file. An as-built survey gives the design team a current, accurate starting point.

For Real Estate and Lending

Buyers, lenders, and title companies sometimes need as-built records to confirm that the improvements on a property are in the right place. This comes up often in commercial real estate sales and refinancing situations.

For Utility Companies

Utility companies frequently require as-built surveys after installing new lines or systems underground. Knowing exactly where those lines are buried protects workers and prevents damage during future digging or nearby construction.

Who Typically Requires an As-Built Survey?

• Local building departments to issue a certificate of occupancy
• Lenders and banks before closing out a construction loan
• Title insurance companies to confirm improvements match the property records
• Utility companies after new underground systems are installed
• Future owners or contractors who need reliable records of what is on the site

How Is an As-Built Survey Done?

A licensed land surveyor visits the finished property and takes careful measurements of all the improvements that were built. For things you can see on the surface, like buildings and driveways, the surveyor records where they sit in relation to the property lines.

For buried utilities, the process works best when the surveyor is on site during construction, before the trenches are filled in. Once a pipe or conduit is underground, finding it again without digging is very difficult.

All the field measurements are brought back to the office and used to create a finished drawing. That drawing becomes the permanent record of the property as it was built.

According to the Construction Industry Institute, poor as-built documentation is one of the top causes of cost overruns during future renovation and expansion work. Good records from the start prevent those problems.

How Much Does an As-Built Survey Cost?

An as-built survey for a home typically costs between $400 and $1,500. Larger commercial projects can range from $1,500 to $5,000 or more, depending on the size of the site and how much needs to be documented.

Here are the main things that affect the price:

• Size of the property. Larger sites with more improvements take more time to document.
• Underground utilities. Recording buried lines adds time and complexity to the work.
• Number of improvements. One building is simpler than a site with multiple structures, parking lots, and utility systems.
• Turnaround time. Faster delivery usually costs more.

The cost of an as-built survey is small compared to what can go wrong without one. Contractors who accidentally damage an unmarked underground line face repair costs, project delays, and legal liability. Accurate records help prevent all of that.

Frequently Asked Questions

Is an as-built survey the same as a record drawing? 

They are similar but not exactly the same. A record drawing is usually prepared by the engineer or contractor using their own field notes. An as-built survey is done by a licensed land surveyor using direct measurements. The as-built survey is more precise and has more legal weight.

Do I need one for a small backyard project? 

For simple work like a fence or a small shed, an as-built survey is usually not needed. But if the project involves a permit, underground utilities, or major grading changes, check with your local building department to find out what records are required.

How long does it take? 

The field work for a standard residential project usually takes one day or less. The finished drawing is typically ready within one to two weeks after the site visit.

Do I need to keep the as-built survey after the project is done? 

Yes. Keep it for as long as you own the property. It is one of the most useful documents you can have if you ever plan to renovate, sell, or refinance. Lenders and contractors will thank you for having it.