The Short Answer
Illinois does not require a survey to sell a residential property. State law has no blanket survey requirement for home sales. That said, surveys come up in Illinois transactions more often than sellers expect, and understanding when one is needed can save time and prevent closing delays.
What Illinois Law Requires at Closing
Illinois is a disclosure state. Under the Illinois Residential Real Property Disclosure Act (765 ILCS 77/), sellers must disclose known material conditions affecting the property, including boundary disputes, encroachments, or claims by neighboring owners that the seller is aware of. The Act requires honest disclosure of known issues, not a survey to discover unknown ones.
A seller who knows of a boundary problem and says nothing risks legal exposure after closing. A survey done before listing can surface these issues when there is still time to address them cleanly.
When a Lender or Title Company Requests a Survey
Even though Illinois law does not require a survey, your buyer's lender or the title company handling the transaction may ask for one. Common triggers include:
- The existing survey on file is more than 10 to 15 years old
- The legal description in the deed uses metes and bounds rather than a recorded plat
- The property is located in a rural area without a recorded subdivision plat
- There is a recorded easement whose location is unclear on the ground
- The property has an irregular shape or a boundary that runs along a natural feature like a creek or drainage ditch
- An addition or outbuilding was constructed after the last survey
- The lender's underwriting guidelines require a current survey for properties above a certain value
In these situations, the transaction may pause until a survey is completed. Having one already done before listing removes this potential delay entirely.
The ALTA Survey: When It Comes Up
Residential sales in Illinois rarely require an ALTA/NSPS Land Title Survey, which is a more detailed and expensive survey type used primarily for commercial transactions. However, on high-value residential properties or transactions involving significant acreage, a title company may request ALTA-level work. Standard residential boundary surveys are far more common for typical home sales.
Flood Zone Status and Survey-Related Questions
Flood zone designation can affect a sale if a property is in or near a Special Flood Hazard Area (SFHA) on FEMA flood maps. Buyers in flood zones may be required to carry flood insurance, which affects their financing costs and sometimes their willingness to purchase. If a property is near a flood zone boundary, a Letter of Map Amendment (LOMA) based on survey elevation data can remove the property from the designated zone and eliminate the flood insurance requirement.
Sellers in Illinois should check their property's FEMA flood zone status at msc.fema.gov. If a property is incorrectly mapped as being in a flood zone, a licensed surveyor can prepare the elevation documentation needed to apply for a LOMA. Resolving this before listing removes a significant obstacle for buyers who need financing.
Encroachments and Boundary Disputes
An encroachment is when a structure, typically a fence, deck, driveway, or addition, extends beyond the property line onto a neighboring parcel. Encroachments can delay or kill a home sale because they affect title insurance coverage and may need to be disclosed under Illinois law.
Common scenarios that create encroachment problems in Illinois real estate transactions:
- A fence built by a previous owner sits two feet over the line on a neighbor's land
- A deck or garage was constructed partly over a recorded utility easement
- A neighbor's addition encroaches onto the property being sold
- A shared driveway lacks a recorded easement
Discovering these issues after a buyer is under contract causes delays and sometimes kills deals. A presale survey gives the seller time to address encroachments before they become transaction problems.
Who Pays for the Survey?
In Illinois real estate transactions, who pays for a survey is a negotiable item. Common arrangements:
- Seller pays for a presale survey as part of preparing the property for listing
- Buyer pays for a survey as part of their due diligence
- Cost is split between buyer and seller as negotiated in the contract
In some markets and price ranges, sellers who provide an existing, current survey attract more confident buyers because it removes one layer of uncertainty from the transaction.
How Much Does a Survey Cost in Illinois?
Survey costs in Illinois depend on location, lot size, and complexity:
- Standard platted lot, downstate Illinois: $400 to $900
- Chicago metro area: $600 to $1,500
- Acreage or rural parcels: $800 to $2,500 depending on size and access to existing records
- ALTA survey for high-value or commercial-adjacent residential: $2,000 to $5,000 or more
If the survey uncovers a problem that delays or kills a sale, the financial cost of not having done it sooner can be measured in weeks of carrying costs and renegotiated prices.
Finding Property Records Before the Survey
Before ordering a survey, gather what you already have:
- Check your closing documents from when you purchased the property. A survey may have been done at that time.
- Look up your parcel on the Illinois GIS Atlas at atlas.illinois.gov or your county's parcel viewer.
- Contact your county recorder's office for recorded plats and prior surveys on file.
- Check with the Illinois State Geological Survey (isgs.illinois.edu) for historical survey data on older rural parcels.
An existing survey that is current and includes corner monuments may still be usable, which can reduce cost or allow a surveyor to provide an update rather than starting from scratch.
Summary: When to Order a Survey Before Selling
| Situation | Survey Recommended? |
|---|---|
| Standard suburban platted lot, no known issues | Optional but helpful |
| Older property with metes and bounds description | Yes |
| Rural or acreage parcel | Yes |
| Property near flood zone boundary | Yes |
| Known encroachment or boundary dispute | Yes, before listing |
| Buyer's lender requires one | Required |
Ready to find a licensed surveyor to help prepare your Illinois property for sale? Search the Illinois land surveyor directory to find licensed professionals in your area.