Sharing a driveway sounds simple until you start asking exactly where it should sit. This comes up a lot with older Birmingham properties, where two homes were built close together and often share access to the street. A plat of survey is usually the first document anyone should look at before laying gravel or pouring concrete. It shows the real dimensions of each lot, not just what looks fair from the porch.

What a Plat of Survey Shows Before Planning a Shared Driveway

A plat of survey is a drawing that lays out a property’s exact boundaries, along with existing structures, recorded improvements, and other features tied to the land. For a shared driveway, this drawing is where planning should start.

It shows precisely where each lot line falls, which matters more than most people expect once two properties are involved. It also shows what’s already built: garages, walkways, fences, utility lines. All of that context helps two neighbors, or a single owner developing both lots, figure out where a shared driveway could realistically fit without running into something already there.

How Property Lines Affect the Width and Position of a Shared Driveway

Once you know where the lot lines actually sit, compare that boundary to the proposed driveway layout. A driveway that looks centered on paper can end up mostly on one property once the real boundary is drawn in.

Width matters here too. A narrow driveway squeezed between two older homes might need to sit almost exactly on the line to work at all, which raises questions about how much space belongs to each owner. Comparing the layout against the surveyed boundary early on avoids a much bigger problem: discovering after construction that the driveway spills onto land it wasn’t supposed to touch.

Why Existing Easements Should Be Reviewed Before Choosing the Driveway Route

Older properties often carry easements that aren’t obvious just from looking at the land. A recorded access easement might already exist between the two lots, sometimes drawn up decades ago for exactly this kind of shared use. Utility easements are common too, and a driveway built over one can complicate future repairs to buried lines.

Drainage easements deserve a close look as well. If water is supposed to flow through a certain path and a new driveway blocks it, that’s a problem that tends to show up the first time it rains hard. Checking these details against the plat before picking a route saves both time and money later.

Using a Plat to Check How the Driveway Connects With Both Properties

A shared driveway has to work for two households, not just one. The plat helps with that comparison by showing exactly how each property is laid out: where garages sit, where existing access points already connect to the street, and how far each structure is from the proposed route.

Does the driveway line up cleanly with both garages, or does one owner end up with an awkward angle? Is there enough clearance near a corner of a house that sits close to the property line? Working through these questions with the plat in hand, rather than guessing from the yard, tends to catch problems before they become expensive to fix.

When Shared Driveway Planning Needs More Than an Existing Plat

An older plat can only tell you so much. If the survey was done years or decades ago, it may not reflect a fence that was added later, a shed built without much thought to boundaries, or grading changes from a past landscaping project. None of that shows up on a drawing that hasn’t been updated.

This is where updated field measurements or a fresh survey come into play. If the proposed driveway sits close to a boundary line or crosses near a recorded easement, relying on an old plat alone is risky. A current survey confirms what’s actually on the ground today, not just what was there when the original document was filed. For a project this permanent, that confirmation is worth the extra step.

Frequently Asked Questions

Can a plat of survey show where a shared driveway should go? 

It can show the property boundaries and existing features needed to plan a driveway location, though the final layout still depends on comparing that data with current site conditions.

Does a shared driveway have to follow the property line? 

Not necessarily. Many shared driveways sit near a boundary rather than directly on it, depending on how the lots are shaped and what easements or agreements already exist.

Can an easement affect the location of a shared driveway? 

Yes. Recorded access, utility, or drainage easements can limit where a driveway can reasonably be placed, which is why reviewing them early matters.

Is an old survey plat enough to plan a new shared driveway? 

Sometimes, but not always. An older plat may not reflect recent changes to the property, so updated measurements are often needed before finalizing plans.

Should both properties be surveyed before building a shared driveway? 

In many cases, yes. Since a shared driveway typically touches both lots, having current data for each property helps avoid boundary or easement conflicts later.