Do I Need an SG Diagram to Build, Subdivide or Sell?

"Do I need an SG diagram?" is one of the most common questions South African property owners ask, and the honest answer is: it depends entirely on what you are trying to do. An SG (Surveyor General) diagram is the official survey of your land. It records your boundaries, your corner beacons (pegs), the length and bearing of each boundary line, your total extent (the size in square metres or hectares) and any servitudes that cross the property. For some tasks it is essential. For others, the diagram that already exists is perfectly sufficient and you do not need a new one at all. This guide walks through the everyday scenarios so you can tell which camp you are in.

First, what an SG diagram is (and is not)

It helps to be clear before you spend a cent. An SG diagram is a cadastral document — it describes the physical shape and dimensions of the land itself. It is not the title deed. The title deed is the ownership record kept at the Deeds Office: it tells you who owns the property, what bonds are registered over it, and the history of transfers. The two live in different places and answer different questions.

• SG diagram — boundaries, beacons, extent, servitudes (the survey).
• Title deed — owner, bonds, transfer history (the ownership).

If your question is really about ownership rather than the survey, that is a job for DeedsCheck, not for a diagram.

When you DO need an SG diagram

You will need to refer to, or in some cases commission a new, SG diagram in these situations:

• Submitting building plans — your architect or draughtsperson needs the diagram to confirm the exact boundaries, the buildable area and any servitudes (a stormwater, sewer or municipal line, for example) so that the new structure is not placed over a line it cannot cross.
• Subdividing your erf — splitting one property into two or more pieces is a formal cadastral process. A land surveyor must survey the new boundaries and the Surveyor General must approve fresh diagrams for each new portion before they can be registered.
• Consolidating two or more properties — merging adjoining erven into a single property is the reverse of subdivision and likewise produces a new consolidated diagram.
• Resolving a boundary dispute — if you and a neighbour disagree on where the line runs, the existing SG diagram is the definitive reference. It shows the beacon positions and boundary measurements, which a surveyor can re-peg on the ground.
• Rezoning or a development application — councils and planners almost always want the diagram to assess the extent of the land and any encumbrances on it.
• Confirming the true size of the property — if a buyer, valuer or bank queries the extent, the diagram is the authoritative source for the registered size.

When you usually do NOT need a new one

Here is the part that saves people stress and money. For most ordinary transactions, no new survey is required at all:

• A standard sale and transfer — when you sell an existing erf to a buyer, the transfer runs on the survey that is already registered. The boundaries are not changing, so no new diagram is produced. The conveyancer references the existing diagram that already sits with the property.
• Renovating within your existing boundaries — alterations that do not move a boundary line do not need a new survey, although your building plans will still reference the existing diagram.
• Registering or cancelling a bond — that is a deeds and ownership matter, not a survey matter.

The key test is simple: are the boundaries of the land changing? If yes (subdivision, consolidation, a new servitude), expect a new diagram. If no (a sale, a bond, an internal renovation), the existing one carries you through.

How to get the SG diagram you already have

Even when you do not need a new survey, you very often need a copy of the existing diagram — for your architect, your bank, a boundary discussion or simply your own records. Every registered erf, farm and agricultural holding already has a diagram on file. You do not need to commission a surveyor to obtain it; you just need to retrieve it.

That is exactly what SGCheck is for. Search your property — by address on the map, or by erf number plus town and portion — and you will see for free which SG diagrams exist for it. If they are there, you can retrieve and download every diagram on the property as a PDF for a single R230 fee. Erf properties (urban) and farms or agricultural holdings (rural) come through instantly; sectional title schemes such as flats and townhouses are sourced manually on request.

Before you book a land surveyor or chase paperwork, it is worth a free SGCheck search to see what is already on record — most of the time the diagram you need is already there.

Frequently asked questions

Do I need an SG diagram to sell my house?

No. A normal sale and transfer of an existing erf runs on the survey already registered for the property, so no new SG diagram is created. Your conveyancer references the existing diagram. You only need a fresh survey if you are changing the boundaries, such as subdividing before the sale.

Do I need a new SG diagram to subdivide my property?

Yes. Subdivision creates new properties with new boundaries, so a land surveyor must survey them and the Surveyor General must approve new diagrams for each portion before they can be registered. This is one of the few everyday situations that genuinely requires a brand-new diagram.

Is an SG diagram the same as a title deed?

No. An SG diagram is the survey of the land — its boundaries, beacons, extent and servitudes. A title deed is the ownership record showing who owns the property and what bonds are registered. They are separate documents held at different offices. For ownership questions, use DeedsCheck.

How do I get a copy of my existing SG diagram?

You do not need to commission a surveyor for a diagram that already exists. Search your property on SGCheck to see for free which diagrams are on record, then pay a single R230 fee to download every diagram on the property as a PDF.