A post-construction survey is a licensed surveyor’s measured record of a property after construction is finished, documenting exactly where buildings, utilities, paved surfaces, and grades ended up so the result can be compared against the approved plans. It’s the document a building department wants before issuing a certificate of occupancy, the one a title insurer needs to drop the survey exception from a policy, and the one a flood or stormwater regulator uses to confirm the finished site stays within its permitted limits. People also call it an as-built survey, and the two terms refer to the same work.
When You’ll Be Required to Get One
Four situations drive almost every post-construction survey order.
The first is occupancy. Municipal codes commonly require a final as-built survey before issuing a certificate of occupancy, particularly for new residential construction and major additions. The International Building Code doesn’t name an as-built survey among its certificate-of-occupancy prerequisites by itself, but it does require the building official to confirm code compliance before signing off, and local jurisdictions routinely do that by demanding a surveyor’s documentation of final conditions.1International Code Council. IBC 2018 Chapter 1 Scope and Administration No survey, no occupancy.
The second is financing. Most lenders require a title policy issued without a survey exception, and removing that exception means the title insurer needs a current survey showing boundaries, encroachments, and easements. The ALTA/NSPS Land Title Survey standards, jointly maintained by the American Land Title Association and the National Society of Professional Surveyors, set the minimum bar for that work.2National Society of Professional Surveyors. 2026 ALTA/NSPS Standards Without it, the title company has no basis for insuring the property free of survey-related defects, and the closing stalls.
The third is flood zone compliance. Properties in FEMA-designated flood hazard areas need a post-construction elevation certificate completed by a licensed surveyor or engineer. It confirms the lowest floor elevation relative to the base flood elevation and directly affects both insurability and flood insurance premiums.3Federal Emergency Management Agency. FEMA Elevation Certificate and Instructions
The fourth is stormwater. Jurisdictions that regulate impervious surface coverage frequently require an as-built survey before releasing performance bonds or closing out NPDES-related stormwater permits. The surveyor calculates exactly how much impervious area was added, and that figure is checked against the approved site plan.
What the Surveyor Actually Measures
The survey captures where things ended up, not where the plans said they would go. At minimum, expect documentation of:
- Building footprints and the distance from every structure to each property line, compared against the setbacks in the approved permit
- Finished floor and grade elevations, which confirm drainage patterns and flood-zone compliance
- Underground utilities, including buried water, sewer, gas, and electrical lines, especially where they cross easements
- Driveways, patios, sidewalks, and other paved or hard surfaces that feed stormwater calculations
- Stormwater facilities such as detention basins, retention ponds, swales, and pipe systems, measured against the engineered design
- Easement and right-of-way lines, verifying that nothing new encroaches on areas reserved for utilities or access
Zoning boards use these measurements to confirm that floor-area ratios and lot coverage stay within permitted thresholds. The data also feeds future transactions, title decisions, and any variance request that comes up later.
Documents to Pull Together Before You Call
Getting organized saves money, because surveyor time is not cheap. The surveyor needs context about what was approved, what legal constraints apply to the parcel, and what sits underground. Have these ready:
- Original site plans and architectural drawings, which are the baseline for comparison
- Building permits documenting the approved scope and any attached conditions
- The property deed, available from the county recorder, which establishes legal boundaries and discloses recorded easements
- Any previous boundary or topographic survey of the parcel, which gives the surveyor a head start on control points and monuments
- The approved stormwater management plan, if one was required, including the impervious surface limits and detention sizing the as-built must verify
Some jurisdictions make recorded documents available online for free; others charge nominal search and copy fees. The more complete the package, the fewer hours the surveyor spends tracking down information you could have supplied.
How the Work Gets Done
Modern surveying combines several instruments, and which ones show up depends on terrain and the accuracy needed. Robotic total stations do most of the work for post-construction projects, delivering sub-centimeter accuracy at distances of several hundred feet. RTK GPS receivers supplement them by establishing precise horizontal and vertical positions across larger sites, typically within a few centimeters. On complex projects a surveyor may run both at once, cross-checking one against the other.
Drone-based photogrammetry and LiDAR scanning have become common on larger sites. Standard photogrammetric drone flights reach roughly 3 to 5 centimeter horizontal accuracy and 1 to 3 centimeter vertical accuracy when paired with ground control points. That is enough for most mapping and construction verification, though projects demanding sub-centimeter tolerances still need ground instruments or supplemental terrestrial scanning.
Once the field crew has coordinates for every structure, utility feature, and grade change, the data moves into CAD software and gets plotted against the approved plans. The comparison is where discrepancies surface. A building that was supposed to sit 10 feet from the property line but actually sits at 9 feet 4 inches gets flagged here, and that flag can carry real consequences.
ALTA/NSPS Surveys When a Lender Is Involved
If a lender or title company is in the deal, the survey likely needs to meet ALTA/NSPS standards. The 2026 edition took effect on February 23, 2026, and surveys completed after that date must comply with the updated requirements.2National Society of Professional Surveyors. 2026 ALTA/NSPS Standards The standards exist to give title insurers enough information to remove the general survey exception from a policy, which is what lenders need before funding a mortgage.4American Land Title Association. Minimum Standard Detail Requirements for ALTA/NSPS Land Title Surveys
Beyond the baseline, the standards include a Table A menu of optional items. The ones most relevant to post-construction work are:
- Item 6, plotting zoning setback requirements and identifying whether the as-built conditions comply
- Item 7, exterior building dimensions, square footage of the footprint, and measured building height
- Item 8, substantial observed features such as parking areas, pools, and landscaping
- Item 11, evidence of underground utilities on or serving the property
Choosing the right Table A items is a conversation between you, the lender, and the title company. Requesting every option drives cost and turnaround. Requesting too few leaves gaps that delay closing. Most title companies will specify what they need before issuing the policy.5American Land Title Association. Minimum Standard Detail Requirements for ALTA/NSPS Land Title Surveys
Flood Elevation Certificates
Construction in a FEMA-designated flood hazard area triggers its own requirement that runs alongside the municipal as-built. The IBC requires flood hazard documentation showing the elevation of the lowest floor before final inspection, and FEMA requires a post-construction elevation certificate to confirm that elevation once the building is complete.3Federal Emergency Management Agency. FEMA Elevation Certificate and Instructions The form must be signed and sealed by a licensed surveyor, engineer, or architect, and a field survey is required for the critical elevation measurements. Getting this wrong doesn’t just create a code violation; it can make flood insurance dramatically more expensive, or effectively unobtainable, for future buyers.
What Happens If the Survey Finds a Problem
This is where most of the trouble lives. When the as-built measurements don’t match the approved plans, the path forward depends on the type and severity of the discrepancy.
Minor deviations in grading or utility placement can often be resolved through a revised site plan or an as-built amendment filed with the building department. The surveyor documents the actual conditions, the engineer or architect evaluates whether the deviation affects performance, and the municipality decides whether to accept it or require correction.
Setback violations are harder. A building that encroaches into a required setback is a zoning violation, and the owner typically must apply for a variance from the local zoning board, which involves a public hearing and no guarantee of approval. Jurisdictions have ordered structures moved or demolished in extreme cases. Even when a variance is granted, it gets recorded against the property and can complicate future sales or refinancing.
Easement encroachments are a separate problem. If a new structure sits partly on a utility easement, the utility company has the legal right to remove whatever is in its way to maintain or install infrastructure. No variance fixes that. The encroachment either comes out, or the easement is formally relocated with the utility’s agreement.
Stormwater and impervious surface violations usually get remedied by adding detention capacity or removing impervious area until the site meets its permitted limits. Municipalities can withhold the certificate of occupancy and impose daily fines until the issue clears, so catching these problems early matters more than people tend to think.
Filing, Deliverables, and Who Gets a Copy
A stamped paper survey is still the legal document, but most jurisdictions now also require a digital submission. The standard format is a CAD file in .dwg or .dxf, with a PDF for archival purposes. Expect the municipality to specify a coordinate reference system, typically the State Plane Coordinate System using NAD83 for horizontal positions and NAVD88 for vertical elevations, measured in U.S. Survey Feet.
Some jurisdictions also require a metadata file naming the project, surveyor credentials, coordinate reference, and submission date. GIS-compatible formats like ESRI shapefiles or geodatabases are increasingly requested for projects that feed municipal mapping systems. Requirements vary widely, so check with the reviewing agency before the surveyor prepares final deliverables. Reformatting a completed survey to meet a specification you didn’t know about is an avoidable cost.
The completed survey must carry the licensed surveyor’s seal, signature, and date before any submission. Every state requires this certification, and a survey without it has no legal standing. The seal confirms the work was performed by the surveyor or under their direct supervisory control.
Where you file depends on who needs it. The building department gets a copy to clear the certificate of occupancy. The title company or lender gets one to finalize the title policy and release funding. If a stormwater permit is involved, the environmental or engineering department gets its own copy. Some jurisdictions accept electronic submissions through a permitting portal; others still require physical delivery or certified mail.
Who Can Legally Sign One
Only a licensed professional land surveyor can perform an as-built survey and certify the results. Licensing is handled at the state level, and most states require passage of state examinations, supervised experience, and continuing education for renewal.6National Society of Professional Surveyors. Surveyors Professional Qualifications
When a survey contains errors that cause financial harm, the surveyor carries professional liability. An incorrectly marked property line that leads to a setback violation, or a missed encroachment that torpedoes a sale months later, can produce significant claims. Many government agencies and private clients require proof of errors and omissions insurance before a surveyor begins work. Disclaimers printed on the face of a survey document, without a signed contract behind them, are widely considered unenforceable, so E&O coverage is the real protection for both the surveyor and the client.
Cost and Timeline
Fees vary with property size, site complexity, and how many Table A items or regulatory certifications are involved. A standard residential as-built on a single-family lot generally runs about $700 to $1,300. Larger residential projects, commercial sites, or surveys that must meet full ALTA/NSPS standards with multiple Table A items can run from $2,000 to $6,500 or more. The surveyor’s travel distance, local labor rates, and whether drone or LiDAR work is needed all affect the final number.
Turnaround follows a similar pattern. A straightforward residential survey typically takes two to five business days from fieldwork to final deliverable. Medium projects run about a week. Large commercial or industrial sites can take two to three weeks, particularly if the scope includes stormwater facility certification, FEMA elevation documentation, or complex utility networks. Government recording fees for filing the completed survey generally run between $10 and $80, though they vary by jurisdiction.
The most common mistake is treating the survey as an afterthought and scheduling it at the last minute. Surveyors are frequently backlogged, especially in peak construction seasons, and a two-week wait for an appointment can blow a closing date that looked comfortable. Build the survey into the project timeline early, not as the final scramble before occupancy.