A subdivision survey is the survey a licensed surveyor runs before one property becomes two or more lots. It shows what you own right now and where the real lines fall. It also shows whether a split can work at all. In Philadelphia, a lot split has to pass city review before it counts, so the survey needs to be right from the start.
Start With the Parcel’s Recorded Identity
A subdivision survey starts with the records that already define your parcel. The surveyor pulls the current deed, any recorded plans and the tax-parcel information for the property. These records show the legal shape of the land you own today.
The goal is to fix the real parcel first, not to draw a new line where an owner would prefer it. Old deeds can have gaps, overlaps, or wording that does not match what sits on the ground. The surveyor sorts this out before anyone talks about splitting. In Philadelphia, the surveyor also checks the parcel against city records so the numbers match what the city has on file.
Test Whether Each Proposed Piece Can Function on Its Own
Each new lot has to stand as its own property, not just look fine on a drawing. The surveyor reviews the split as two or more working parcels. A lot that looks even on paper can still fail once you check how people reach it and build on it.
A few things decide whether a proposed lot can work:
- Access to a public street or a legal way in
- Enough street frontage for the zoning district
- Room around existing buildings
- Water, sewer and other service lines that can reach each lot
- Space left for future use
Not every property meets the same rules. Philadelphia sets minimum lot area and lot width by zoning district, so a split that works in one part of the city may not work in another. The survey helps you see these limits early, before you spend money on a plan that cannot pass.
Account for Rights That Cross the Proposed New Line
Some rights run across a property and do not stop where you want the new line. Easements, shared driveways, utility corridors and drainage rights can all reach across a lot split. These are recorded interests, so they stay with the land even after you divide it.
A subdivision survey shows where these rights sit next to the proposed lots. A power line easement might clip the corner of the new back lot. Two homes might share one driveway that now crosses the split line. When the survey maps these early, you can plan around them instead of finding them later. That saves trouble when the city and other owners review the split.
Separate Existing Improvements From the New Parcel Layout
Before a parcel gets divided, the surveyor locates the things already built on it. That means buildings, driveways, parking areas, fences and sheds. Each one gets measured and placed on the survey against the proposed new line.
A split that looks simple can raise real questions once you see where the improvements fall. A driveway might cross into the new lot. A garage might sit too close to a setback line. A fence a neighbor built might not match the deed line at all. The survey catches these before the split, so a small fix does not turn into a stalled project. It also shows whether one lot ends up short on parking or access because a building took the space.
Turn Field and Record Findings Into a Subdivision Plan
Once the field work and record checks are done, the surveyor draws them into a subdivision plan for the proposed lots. This plan shows the new lines, the improvements, the easements and the numbers that back each lot. It gives you and your reviewers one clear picture of the split.
In Philadelphia, this plan supports your next review steps. The city handles lot changes under Title 14 of its code. A smaller change may go through a lot-line adjustment, while a true split into new lots often needs a subdivision plat review. The Philadelphia City Planning Commission reviews subdivision plats at public meetings, first as a preliminary plat and then as a final plat. After the split is approved, you can apply for a zoning permit.
A survey plan does not promise approval. Local review, recording and other rules depend on your property and your plan. A subdivision plat review may also come into play when new lots do not front a public street, or when the split touches city streets or service lines. The survey gives the city and you the facts to review the split.
