A deposited plan is a registered survey document that legally defines the boundaries of a land parcel and creates the lots that appear on certificates of title. In Torrens title jurisdictions like Australia, New Zealand, and parts of Canada, every title points to a lot number and a deposited plan number held in the land registry. If you see “DP” followed by a number on your title, that is the plan that defines what you own. Without it, there is no legally recognized parcel to buy, sell, or mortgage.
What Is on a Deposited Plan
A deposited plan is a precise technical document, not a sketch. When you pull one from the registry, you should expect to see several categories of information.
- Lot numbers. Every parcel the plan creates receives a consecutive number. The combination of lot number and DP number (for example, Lot 5 in DP 123456) becomes that parcel’s permanent legal identity.
- Boundary measurements. The length and bearing of every boundary line, drawn so the parcel can be reproduced on the ground. The measurements must close mathematically, forming a complete shape with no gaps.
- Total area. Each lot includes a calculated area, usually in square meters or hectares.
- Easements and restrictions. Rights that burden or benefit the land, including utility easements for water, sewer, or electricity infrastructure, shared driveway access, drainage rights, and government resumptions where land has been reclaimed for public use.
- Road dedications and reserves. Parcels set aside as public roads, road widenings, or drainage reserves are shown separately and labeled accordingly.
- Adjoining land references. Neighboring lots are labeled with their own lot and DP numbers so a reader can identify exactly which parcels border the subject land.
- Surveyor’s certification. The registered surveyor who prepared the plan signs and certifies its accuracy.
Where a lot is physically split by a road or river, each portion is shown as a separate part with its own dimensions while sharing a single lot number.
When a New Deposited Plan Is Required
A new deposited plan is needed whenever the legal boundaries of land are being created or changed. The most common triggers are:
- Subdivision. Splitting one parcel into two or more new lots. Each new lot gets its own number and, once registered, its own certificate of title.
- Consolidation. Merging two or more existing lots into a single parcel.
- Boundary adjustment. Shifting the boundary between neighboring lots without creating additional parcels. Both affected lots receive updated legal descriptions.
- Easement creation. Formally establishing a new right-of-way, utility corridor, or access path that must be recorded against the title.
- Road dedication. Setting aside land for public road purposes, which removes that area from private title.
Any time the land registry has to issue a new or amended title, a deposited plan provides the spatial framework for doing it. The plan is prepared by a licensed or registered surveyor, lodged with the registry, examined for compliance, and then registered with its official DP number. At that point the new lots exist as independent legal entities and the old title for the parent parcel is cancelled.
Deposited Plans Compared to Other Plan Types
Several registered plan types exist alongside deposited plans, and confusing them leads to misunderstandings during property transactions.
Strata Plans
A strata plan subdivides a building (or sometimes land) into individual lots and common property under a strata or community title scheme. Where a deposited plan divides land horizontally across the ground, a strata plan divides space three-dimensionally, defining individual apartments, townhouses, or commercial units within a shared structure. If you own a unit in a strata building, your title references a strata plan number rather than a DP number.
Compiled Plans
A compiled plan assembles boundary information from earlier surveys rather than requiring fresh fieldwork. Compiled plans are permitted for straightforward consolidations where the existing survey data is reliable and meets precision standards. For a consolidation of lots you already own, a surveyor may be able to use a compiled plan rather than redoing all the field measurements.
Recorded Plats in the United States
In the United States, where most jurisdictions use a deed-recording system rather than Torrens title, the closest equivalent is a recorded subdivision plat, filed with a county recorder’s office. The terminology and registration process differ, but the function of creating legally recognized parcels through a surveyed and registered document is the same. If you are dealing with property in the US, look for “plat map” or “recorded plat” rather than “deposited plan.”
How a Deposited Plan Appears on Your Title
Your certificate of title identifies your property by referencing a lot number and a deposited plan number. A legal description reading “Lot 12 in Deposited Plan 987654” tells you that your property is the twelfth lot created by that plan. This reference is permanent. Even if the property changes hands dozens of times over the following century, the lot and DP number stay the same unless a new deposited plan is registered that further subdivides or consolidates the land.
You can trace the spatial history of any parcel by following the chain of deposited plans. If Lot 12 in DP 987654 was created by subdividing Lot 3 in DP 456789, and that lot was itself carved from an earlier parcel, the deposited plans form a genealogy of the land. Surveyors routinely trace this chain when preparing new plans to keep their measurements consistent with the historical record.
When the Plan and the Ground Disagree
A registered deposited plan defines the legal boundary, but physical reality does not always cooperate. Fences drift over the years, neighbors build structures slightly over the line, and older surveys may have used less precise equipment. When the boundary shown on the plan does not match what is on the ground, disputes arise.
Resolving these conflicts follows a hierarchy of evidence. Natural landmarks like riverbanks and ridgelines carry the most weight, followed by artificial monuments such as survey pegs and boundary markers. Written measurements in bearings and distances rank below physical markers, and stated areas are considered the least reliable indicator. The practical consequence: if a survey peg is in the ground and the written measurements point somewhere slightly different, the peg usually wins.
Long-standing occupation can also override what the plan says. In many jurisdictions, if neighboring owners have treated a fence line or other physical feature as the boundary for a prolonged period, that boundary can become legally binding through acquiescence or adverse possession, regardless of what the deposited plan shows. The specific time period and requirements vary by jurisdiction, but the principle is widely recognized: a boundary that both sides have respected for decades is difficult to move, even with a plan showing it should be elsewhere.
This is where many buyers make their biggest mistake. They treat the deposited plan as the final word and never walk the boundary with a surveyor. A boundary identification survey in Australian jurisdictions, or an ALTA/NSPS land title survey in the US, will flag discrepancies between the plan and the ground before you commit to the purchase. Discovering an encroachment after settlement is far more expensive than paying for a survey beforehand.
Correcting Errors on a Registered Plan
Registered deposited plans occasionally contain errors, from minor typographical mistakes like a misspelled street name to more serious problems like an incorrect bearing that shifts a boundary line.
For minor technical errors that do not change any physical boundary, a correction can typically be made through an amendment process without preparing an entirely new plan. The surveyor who prepared the original plan, or another licensed surveyor if the original is no longer practicing, prepares a certificate of amendment specifying what is being changed and why. The certificate is signed, sealed, examined by the relevant authority, and then recorded against the original plan.
Errors that affect physical boundary locations are a different matter. If a boundary was surveyed incorrectly and the error changes the size or shape of a lot, an amendment will not suffice. The affected landowners may need a new deposited plan, fresh survey work, and potentially agreement from neighbors whose land is also affected. In serious cases, particularly where structures have been built in reliance on the incorrect plan, the dispute may require court resolution.
The cost scale is dramatic. A typographical correction might take weeks and a modest professional fee. A boundary error that affects multiple lots can take years and tens of thousands of dollars to resolve, especially if buildings or improvements straddle the disputed line.
How To Look Up a Deposited Plan
Registered deposited plans are public records. Most land registries offer online search portals where you can look up a plan by its DP number, the lot number, or the property address. You will typically pay a search fee for each plan or title document you retrieve. In-person requests at registry offices remain available in many jurisdictions, though the trend is firmly toward digital access.
There are several reasons to obtain a copy. If you are buying property, reviewing the deposited plan alongside the certificate of title reveals easements and restrictions that may not be obvious from a physical inspection. If you are planning renovations or a new build, the plan confirms your lot boundaries and setback measurements. If you are in a dispute with a neighbor about a fence line or overhanging structure, the deposited plan is the starting document for any surveyor you hire to investigate.
When you receive a copy, check that the lot number and DP number match what appears on the certificate of title. Verify that any easements shown on the plan correspond to the easement notations on the title. Discrepancies between the plan and the title are uncommon but not unheard of, and catching them early avoids complications at settlement.