checkproperty.co.za

Second dwelling in Johannesburg: granny flat rules before you build a cottage

20 May 2026 · 6 min read

A second dwelling is one of the most practical ways to get more out of a suburban erf. It can house a parent, give an adult child independence, or bring in rent that covers a good part of the bond. It is also one of the most common sources of unlawful building in Johannesburg, because many owners assume that if there is space, they may build.

Before you build a granny flat or cottage, these are the rules to check.

Second dwelling Johannesburg: what counts

Terms vary — granny flat, cottage, garden flat, second dwelling, subsidiary dwelling — but the planning concept is the same: a second, self-contained dwelling unit on an erf whose primary right is a single dwelling house.

Self-contained is the key. A room with its own kitchen and bathroom that can be occupied independently is a dwelling unit. That is what distinguishes it from an outbuilding such as staff quarters, a studio or a pool room, which is ancillary to the main house.

The distinction matters, because the scheme treats them differently. A structure approved as an outbuilding and then let as a separate flat may be an unlawful use, even though the building itself has approved plans.

Can I build a cottage on my property?

Whether you can put a second dwelling on property zoned for a single house depends on four things.

1. The zoning and the scheme

Start with a zoning check. On a Residential 1 erf, the land use scheme sets out whether and on what terms a second dwelling is allowed. Depending on the scheme's provisions and your erf, a second dwelling may be permitted subject to conditions, or may require the municipality's consent.

Typical conditions deal with:

  • the maximum size of the second dwelling, often as a floor area or relative to the main house;
  • the minimum size of the erf;
  • that both dwellings remain on one erf in the same ownership — a second dwelling cannot be sold off separately;
  • parking for the additional unit;
  • access.

Do not rely on what a neighbour did. Conditions differ by area and change over time.

2. The title deed

This is where many projects stall. Older townships often carry a title condition allowing only one dwelling on the erf. The scheme may permit a second dwelling while the deed prohibits it — and the deed prevails until the condition is removed. See title conditions.

3. The space the rules leave

The cottage has to fit inside:

Many erven that look spacious have very little coverage left.

4. Building plans

Every second dwelling needs approved building plans under the National Building Regulations, regardless of size. This is separate from the planning question. Plans are checked for zoning compliance as part of approval, which is where a problem with the points above will surface.

Granny flat rules that are commonly broken

Converting a garage or outbuilding. Turning a garage into a flat is a change of use and normally needs plans. It also removes covered parking that the original approval may have depended on.

Building the second dwelling larger than allowed. Exceeding the size limit turns a permitted second dwelling into something that needs different rights.

Adding a third unit. Two dwellings on a Residential 1 erf may be permissible. Three is a different zoning.

Letting rooms individually. Renting rooms to separate households can amount to a boarding or accommodation use, which is not the same as a dwelling.

Separate sale. A second dwelling does not create a second property. To sell it separately you would need a subdivision or a sectional title scheme, each with its own requirements.

Build second house on property: when a cottage is not enough

If the plan is a full second house rather than a modest cottage, the size limit on a second dwelling may rule it out. The alternatives are:

Each takes longer and costs more than a second dwelling, but each creates rights that a second dwelling does not.

Build granny flat or build cottage on property: a sensible sequence

  1. Confirm the zoning and the second-dwelling provisions for your erf.
  2. Read the title deed for a one-dwelling restriction.
  3. Work out remaining coverage and where the building lines fall.
  4. Check for servitudes across the part of the garden you have in mind.
  5. Brief an architect or draughtsperson with those facts.
  6. Submit building plans and wait for approval before building.

On checkproperty.co.za, the Development potential report covers the zoning, building lines, title deed reference and servitudes for the erf, and — where the rules for that zone have been verified — includes a second-dwelling assessment.

Buying a property that already has a cottage

A rental cottage adds value only if it is lawful. Before you pay for the income:

  • ask for approved plans showing the cottage as a dwelling;
  • compare the plans with what is built;
  • check whether the title deed allows it.

An unapproved cottage is a liability that transfers to you. See unapproved structures: what a buyer inherits.

Frequently asked questions

Do I need permission for a granny flat if a relative will live there? Yes. The rules apply to the building and its use, not to who occupies it.

Can I have a separate electricity or water meter? Metering arrangements are a matter for the municipality and do not by themselves create a separate property.

Will a second dwelling increase my rates? Improvements are reflected in the municipal valuation at the next valuation.

The bottom line

A second dwelling is often possible, but it is permitted on conditions, not as a given. Check the scheme provisions for your erf, the title deed and the space left by building lines and coverage — then get plans approved before a brick is laid.

Check your property before you plan the cottage.

This is general information, not town-planning or legal advice. Second-dwelling provisions are set by the land use scheme and conditions specific to each erf; confirm with the municipality or a registered town planner.