You own two lots side by side. On paper, they’re two separate parcels. You want them to act as one.

Maybe you want to build across both. Maybe you want fewer tax bills, or a cleaner sale later. Whatever the reason, you can’t just draw a new line and call it done. The county needs proof of where the real lines sit first. That proof comes from a boundary line survey.

A boundary line survey finds, measures, and marks the true corners and edges of each lot. It’s the starting point for a clean lot combination. Skip it, and small errors can turn into big problems once the parcels are joined. This guide walks through what the survey checks, what you should prepare, and what to confirm early.

Confirming the Existing Boundaries of Both Lots

Before two lots can become one, you need to know exactly where each one starts and ends. Deeds and old plats give a written version of the lines. But the words on paper don’t always match what’s on the ground.

A surveyor pulls the recorded documents for both lots. Then they go out and locate the physical evidence, like iron pins, monuments, and old markers. They compare what they find to what the records say. When those two things don’t agree, the boundary line survey sorts out the correct location.

This step matters more than people expect. Fences, driveways, and hedges often sit a few feet off the real line. If you combine the lots without checking, you carry those mistakes into the new parcel. A clear boundary line survey gives you a solid base to build the combination on.

Identifying Shared Lines, Easements, and Recorded Restrictions

The line between your two lots is the one that usually goes away in a combination. But it’s not the only line that matters. The survey also flags anything else attached to the land.

Easements are a common one. An easement gives someone else the right to use part of your property. A utility company may have a line for pipes or wires. A neighbor may have a driveway easement to reach the road. These rights don’t always disappear when lots merge, so you need to know they exist.

Recorded restrictions are the other piece. These can include setbacks, deed covenants, or limits tied to a subdivision. Some restrictions stay in place after the combination. Your surveyor marks these on the drawing so nothing gets missed.

Here’s what to watch for:

• Utility, drainage, or access easements crossing either lot
• Setback lines that limit where you can build
• Deed restrictions or covenants tied to the parcels
• Any shared access that serves both lots

Preparing Survey Data for the Lot Combination Process

Once the boundaries are confirmed, the survey data becomes the foundation for the paperwork. To combine two lots, you usually need a new legal description and a recorded document that shows the joined parcel. The survey supplies the exact measurements for both.

Many places require a lot of consolidation plat or a similar filing. This is a drawing that shows the two old lots and the single new one. It lists the new corners, distances, and total area. Your surveyor prepares this so it meets local filing rules.

The exact requirements can vary by municipality, county, and project type. Some areas want planning approval before the combination is recorded. Others have zoning rules about minimum lot size or use. Confirm the local process early, especially if a closing, permit, or build date depends on it.

Why timing matters here

Recording a combined lot takes time. There may be reviews, fees, and sign-offs along the way. Start the boundary line survey well before your deadline so a slow approval doesn’t stall your plans.

Checking How Existing Improvements Cross the Combined Site

Structures and features often sit close to the old line between two lots. A shed, garage, fence, or driveway might cross it. While the lots were separate, that could have been a problem. Once combined, some of those issues clear up on their own.

But new questions can appear too. When two lots become one, the setback lines change. A building that met the rules on a small lot may sit differently on the larger combined parcel. Your surveyor checks how each improvement lines up with the new boundaries.

This is where a close look at the site pays off. The survey shows what’s built, where it sits, and how it relates to the joined lines. If something crosses onto an easement or breaks a setback, you’ll know before you file. Catching it now is far cheaper than fixing it after the fact.

Using Updated Boundary Information for Future Development Plans

After the combination is recorded, you have one parcel with one clean legal description. That single description is what banks, builders, and the county will use going forward. It removes the confusion of two overlapping records.

This updated boundary information sets up your next steps. If you plan to build, the design team works from accurate lines and known easements. If you plan to sell, a buyer and lender see a clear, current picture of the property. Good survey data early keeps later work from stalling.

Keep your survey and combination documents in a safe place. Future permits, financing, and construction often ask for them. Having them ready saves time when it counts.

Frequently Asked Questions

What is a boundary line survey?

A boundary line survey finds and marks the true corners and edges of a property. The surveyor uses recorded deeds, plats, and physical markers to confirm the lines. It shows exactly where one parcel ends and another begins. For combining two lots, it’s the first and most important step.

Do I need a survey to combine two lots?

Most local governments require accurate boundary data before they’ll record a combined parcel. A boundary line survey supplies that data and supports the new legal description. Some areas also need a consolidation plat or planning approval. Confirm your local rules early, since they vary by county and municipality.

Will combining two lots remove old easements?

Not always. Easements often stay in place even after two lots become one parcel. A utility line, drainage path, or access right can survive the combination. Your survey should flag any easements so you know what carries over.