Most people think of land surveys as something that happens before construction. An as-built survey is different. It happens after. If you are a contractor, developer, or homeowner finishing a building project, this is the survey that confirms the work was done correctly and that the finished structure meets every legal and zoning requirement on record.

What an As Built Survey Is

An as built survey is a detailed measurement of a structure or site taken after construction is complete. It documents exactly what was built, where it was built, and how it relates to the property boundaries, setback lines, and approved plans.

Think of it this way. Before construction begins, a set of plans shows what should be built. During construction, things change. Workers adjust. Materials shift. Grades get modified. Small deviations from the original plan are common on almost every job site.

An as-built survey captures the final, actual conditions. It answers one simple question: does what was built match what was approved?

What an As Built Survey Documents

A thorough as built survey records the following:

• Building footprint and dimensions. The actual size and shape of the finished structure, measured from the ground.
• Location on the lot. Where the structure sits in relation to the property lines and corners.
• Setback compliance. Whether the building meets the minimum distances from each property boundary required by local zoning.
• Floor elevations. The finished floor height of the structure, which is especially important in flood-prone areas.
• Driveways, parking areas, and paved surfaces. Their locations, dimensions, and relationship to the property boundaries.
• Utility connections. The locations of visible utility hookups and service entry points.
• Site improvements. Walls, fences, steps, and other permanent features added during the project.

The finished document is a certified map or plat signed and sealed by a licensed land surveyor. It becomes part of the official record for the property.

Why Builders and Developers Need One

Permit Closeout and Certificate of Occupancy

In most Alabama jurisdictions, a certificate of occupancy cannot be issued until the building department confirms the finished structure meets zoning and setback requirements. An as-built survey provides that confirmation. Without it, the permit stays open and the building cannot be legally occupied.

This is one of the most common reasons builders order an as built survey. It is not optional when the local jurisdiction requires it, and many do.

Lender and Investor Requirements

When a construction loan converts to a permanent mortgage, lenders often require an as-built survey to confirm the completed structure matches what was financed. A building that does not match the approved plans can create problems with the loan conversion, the title policy, or both.

Developers working with institutional investors face similar requirements. Investors want documentation that the project was built as described before they release final funding.

Catching Problems Before They Become Legal Issues

Sometimes construction does not go exactly as planned. A foundation gets poured a few feet closer to the property line than intended. A garage ends up slightly over the setback line. These are not always visible to the naked eye, but they show up clearly on an as-built survey.

Finding these issues right after construction is finished is far better than finding them during a sale, a refinance, or a neighbor dispute years later. At that point, the structure is already built and the options for correction are limited and expensive.

Documentation for Future Work

An as built survey creates an accurate baseline record of the property as it exists after construction. If the owner later wants to add a deck, expand the building, or sell the property, the as-built survey is the starting point for any new design work or due diligence review.

Without it, future surveyors, engineers, or buyers have to start from scratch measuring what was built, which adds time and cost to any future project.

As Built Surveys vs. Construction Staking

These two survey types work as a pair, but they serve opposite purposes.

Construction staking happens before and during construction. A surveyor sets physical markers on the site to guide where the building, utilities, and other features should be placed. It tells the crew where to build.

An as-built survey happens after construction. It measures where everything ended up. It confirms what was built.

Together, they form a complete record of a construction project from layout to completion. If construction staking was done carefully and the crew followed it, the as built survey should confirm the structure is exactly where it should be.

Who Else Uses As Built Surveys

While builders and developers are the most common users, as built surveys also come up in other situations.

Homeowners completing major renovations. A large addition, a new detached garage, or a significant site improvement may require an as-built survey for permit closeout, depending on the local requirements in Alexander City.

Commercial property buyers. When buying an existing commercial building, buyers sometimes order an as-built survey as part of due diligence to confirm the structure’s actual footprint and setback compliance. This connects closely to the ALTA survey process covered in the article on what an ALTA survey is and when you need one.

Insurance companies. In some cases, insurers request as built documentation to confirm the physical characteristics of a building before issuing or renewing a policy.

How Much an As Built Survey Costs

Cost depends on the size of the project, the complexity of the site, and how much detail is required. For a standard residential project, as built surveys typically range from $800 to $2,500. Commercial projects or sites with complex improvements run higher.

The cost is almost always worth it when compared to the risk of a failed permit closeout, a delayed loan conversion, or a zoning violation discovered during a future sale.