Why It Matters
Lenders often require a survey before closing, but even when they don't, skipping one is a gamble. A survey proves exactly where your property ends and the neighbor's begins — and it surfaces problems a title search cannot catch: a fence crossing the lot line, a garage sitting in an easement, a driveway straddling the adjacent parcel. Discovering those issues after closing costs far more than ordering a survey before you sign.
At a Glance
- Professional measurement and mapping of land boundaries, easements, and improvements
- Conducted by a licensed land surveyor
- Types: boundary, ALTA/NSPS, topographic, and location surveys
- Required by most lenders on commercial and investment purchases; sometimes waived on residential
- Reveals encroachments, easement violations, and boundary discrepancies invisible in title
- Results compared to the property's plat and the deed's legal description
- Cost: roughly $400–$3,000+ depending on type, lot size, and location
- Order during due diligence — not after closing
How It Works
The surveyor's job. A licensed land surveyor locates property corners using the deed's legal description, recorded plats, and GPS or laser equipment. The result is a survey plat — a map showing lot lines, dimensions, easements, improvements (buildings, fences, driveways), and any encroachments crossing the boundary. Stakes or iron pins mark the physical corners.
Common types. A boundary survey establishes property lines only — the workhorse for residential purchases and lot questions. A location survey adds the position of existing buildings on the lot; some lenders accept it to confirm improvements fall inside the boundaries. An ALTA/NSPS survey is the most comprehensive: boundaries, improvements, easements, encroachments, zoning setbacks, utilities, and access — required by commercial lenders and title companies issuing extended coverage policies. A topographic survey maps elevation changes and drainage for construction or environmental analysis.
Timing. Order a survey during the inspection period — before your contingency deadline. If the survey reveals a material problem, you have leverage to renegotiate, demand a cure, or exit the contract. A survey ordered after closing eliminates all of that leverage.
Real-World Example
Phil is under contract on a 12-unit building in Tucson for $1.85 million. The seller's disclosure is clean, and photos show an asphalt parking lot running to what appears to be the rear lot line. His lender requires an ALTA/NSPS survey.
The surveyor returns two findings. First, a neighbor's block wall sits 2.3 feet inside Phil's rear boundary — a live encroachment. Second, a recorded utility easement runs 10 feet along the north side; the seller counted six cars parked in that strip, inflating the stated parking count from 22 to 28.
Phil's attorney sends a demand: cure the encroachment and reduce the price to reflect 22 actual spaces. The seller agrees to a $60,000 price reduction and provides a written easement agreement from the neighbor. Without the ALTA survey, Phil closes on a building with a defective parking count and an unresolved boundary dispute.
Pros & Cons
- Surfaces boundary disputes, encroachments, and easement violations before closing
- Required for ALTA title insurance — the broadest protection against survey-related claims
- Identifies access issues (legal road frontage) that title searches miss
- Supports renegotiation when problems surface during the contingency window
- Protects value-add plans that depend on site layout: ADU placement, parking counts, additions
- Adds $400–$3,000+ in cost and 5–15 business days to the closing timeline
- ALTA surveys cost significantly more than basic boundary surveys
- In residential markets, buyer survey waivers are common — creating pressure to skip due diligence
- Some defects cannot be resolved before closing, creating friction or deal risk
Watch Out
Don't confuse a location survey with an ALTA. Some lenders accept a cheap, fast location survey to satisfy their survey requirement. It shows building positions but does not certify boundaries or easements. For any investment property where those details matter, push for a full boundary or ALTA survey.
Survey exceptions in title insurance. A standard title policy excludes coverage for anything a current survey would have revealed — the "survey exception." To remove it, you need an ALTA survey and an extended coverage policy. On commercial deals and higher-value residential investments, that upgrade is almost always worth the cost.
Old surveys are unreliable. A 10-year-old survey does not capture structures built since then, fences moved by neighbors, or easements recorded in the interim. If the seller provides an existing survey, have it re-certified by the original surveyor — or order a fresh one.
Ask an Investor
The Takeaway
A survey is the only document that tells you exactly what you're buying and what sits on it. For any investment property involving land, order an ALTA/NSPS survey during due diligence. The $1,000–$3,000 cost buys leverage if problems surface — and legal protection if they don't.