Montgomery County MD Property Lines & Survey Lookup (Free Resources, 2026)

Quick Answer

To find Montgomery County, MD property lines and survey information for free:

1. Montgomery County GIS map viewer — interactive parcel map showing approximate boundaries, zoning, and aerial overlay.
2. Maryland Land Records (mdlandrec.net) — the recorded plat map for your subdivision, which is the legal source for lot lines.
3. SDAT — lot dimensions and acreage from the assessment record.

For a legally binding property line — required for fence permits, construction near the line, or boundary disputes — you need a licensed Maryland land surveyor to mark the corners. Online sources are reference quality, not survey quality.

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Online Sources Are Approximate (Important Caveat)

GIS map viewers and recorded plat scans are great starting points, but every county GIS in Maryland prominently disclaims that the displayed parcel boundaries are for reference only. Margins of error can be 5–15 feet in some cases.

When a real decision rides on the line — building a fence, an addition, a pool, a deck — Maryland requires a licensed surveyor's mark. The cost is typically $400–$1,200 in Montgomery County depending on lot complexity, and the result is the only document a permit office or court will accept as definitive.

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Step 1: Montgomery County GIS Map Viewer

Montgomery County publishes an interactive parcel map (search "Montgomery County GIS map"). The viewer lets you:

• Find any property by address and see the approximate lot outline
• Toggle aerial imagery, topography, zoning, and floodplain layers
• Measure approximate distances between points
• See the SDAT parcel ID, lot area, and owner name

The GIS map is the fastest way to understand the shape of a lot before driving out to look at it, or to estimate setback distances from a planned addition.

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Step 2: The Recorded Plat Map

Every subdivision in Montgomery County has a plat map filed with the Circuit Court when the subdivision was first recorded. The plat shows the surveyed dimensions of every lot, easements, road right-of-way widths, and lot numbers.

How to pull the plat:

1. Open mdlandrec.net (free account required — see the Montgomery County deed lookup guide for the full walkthrough).
2. Choose Plats instead of the standard land records.
3. Select Montgomery County and search by subdivision name or plat reference (your deed will cite "Plat Book X, Plat Y").
4. Open the scanned plat PDF.

The plat is the surveyed source document the developer recorded. It controls lot dimensions unless a subsequent boundary line adjustment was recorded.

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Step 3: SDAT Lot Dimensions

SDAT's real property search lists the lot size in square feet or acres, year built, and the legal description tying the parcel to its plat reference. This is enough to sanity-check what the GIS map shows but does not contain a scaled drawing of the lot.

For the full picture of every record SDAT holds on a property, see the Montgomery County property records guide.

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Step 4: Existing Surveys (Title or Closing File)

If the property has been sold recently, a survey may already exist in the prior closing file. Possible sources:

• Title company from the most recent purchase — they may retain the survey on file.
• Original homeowner's records — surveys are usually delivered to the buyer at closing.
• Mortgage lender's file — if a survey was required for the loan, the lender's title file will include it.

A survey from the last 5–10 years is often sufficient for refinancing or non-critical decisions, but most surveyors will recommend a fresh survey for new construction or boundary disputes.

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When You Actually Need a New Survey

Hire a licensed Maryland land surveyor when:

• Building a fence, deck, addition, pool, or shed within 5–10 feet of a property line
• Resolving a boundary dispute with a neighbor
• Filing a subdivision or lot consolidation
• Confirming easement locations before excavating
• Closing on a property where the title company requires a current survey (more common for unique lots, large parcels, or rural property)

The surveyor will physically locate the corners, mark them with rebar and caps, and prepare a stamped drawing accepted by Montgomery County DPS (Department of Permitting Services) for permit applications.

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Easements: The Invisible Property Lines

A property may have utility, drainage, conservation, or access easements that don't appear on a casual GIS lookup. These are recorded against the deed and the plat:

• Utility easements — typically along property lines or at the rear, granting power/water/sewer providers access
• Drainage easements — for stormwater management
• Conservation easements — common on properties adjacent to county parkland or stream valleys
• Access easements — driveways crossing a neighbor's lot, shared roads in older neighborhoods

Pull every recorded document touching the address in Maryland Land Records to surface easements before you build anything that could violate one.

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Frequently Asked Questions

How do I find my property lines in Montgomery County, MD?

For reference, use the Montgomery County GIS map viewer (free, online) and the recorded plat at mdlandrec.net. For legally binding lines required for permits or disputes, hire a licensed Maryland surveyor.

Where can I get a property survey in Montgomery County?

Any licensed Maryland land surveyor can survey a Montgomery County property. Costs typically run $400–$1,200 depending on lot size and complexity. The county does not perform surveys for private parties.

Is the Montgomery County GIS map accurate enough for a fence?

Probably not. The county explicitly disclaims that the GIS parcel boundaries are reference-only and not survey-accurate. For a fence near the property line, get a survey or build at least 5 feet inside what the GIS shows to leave a safety margin.

Are property lines public record in Maryland?

The recorded plat — the surveyed source document for lot dimensions — is public record and free to view through Maryland Land Records (mdlandrec.net). Survey accuracy on the ground requires a licensed surveyor.

How do I find easements on my Montgomery County property?

Search the property's full record at mdlandrec.net and review every recorded document — easements show up as separate filings recorded against the deed. The recorded plat also shows surveyed easements within the subdivision.

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Related Resources

• Montgomery County MD Property Records: Free Search for Deeds, Taxes & Owners
• Montgomery County MD Deed Lookup: Free Land Records Search
• Montgomery County MD Tax Records Lookup
• Montgomery County Property Assessment: How It Works and How to Appeal

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Looking at a property where the lot lines or easements matter (corner lot, irregular boundary, large parcel)? Reach out — I'll help you read the plat and recommend a local surveyor.