Unauthorized Construction

The line between "minor building work" and "unauthorized construction" is often misunderstood. Many homeowners assume that if they aren't adding a whole room, they don't need to talk to the municipality.

According to SANS 10400 and the National Building Regulations, the following "small" jobs often require at least a Minor Building Work (MBW) application or municipal permission, even if full professional plans aren't always mandatory:  

1. Internal Wall Removal

While knocking down a non-load-bearing wall to create an "open-plan" feel is common, it technically requires municipal notification. If the wall is load-bearing, you need full structural plans and an engineer's sign-off. Doing this without approval can lead to insurance claim rejections if the roof sags or cracks appear later.

2. External Boundary Walls and Fences

Many people believe they can build a wall around their property as high as they like. In reality:

• Walls higher than 1.8 meters usually require building plans.

  
  

• Even for lower walls, there are regulations regarding "sight lines" (visibility for traffic) near corners or driveways.

  
  

3. Carports and Covered Patios

This is perhaps the most common violation. A "temporary" shade-cloth carport might be fine, but as soon as you add a permanent roof (even if the sides are open) or exceed 40 m², it is no longer considered minor work and requires formal approval.

4. Swimming Pools and Large Koi Ponds

Installing a pool, even a pre-fibreglass shell, requires a plan. Municipalities are particularly strict about this due to drainage and safety regulations (e.g., specific fencing and gate requirements to prevent drowning).

5. Changing Door or Window Openings

• Door to Window (or vice versa): If you keep the original width of the opening, it's usually MBW.  

  
  

• Widening an opening: If you make a window wider to install stacking doors, you are changing the structural integrity of the wall (needing a new lintel), which requires plans.

6. Small Outdoor Structures

There are very specific size limits for "unplanned" structures:  

• Tool sheds: Must be under 10 m².  

  
  

• Children’s playhouses: Must be under 5 m².  

  
  

• Greenhouses: Must be under 15 m².

  Anything larger than these dimensions needs to be on your official site plan.  

  
  

7. Solar Water Heaters

Installing a solar geyser or heat pump system that exceeds 6 m² on a roof (or 12 m² elsewhere) requires municipal approval. There are also weight considerations for the roof structure that must be accounted for under SANS regulations.

Why it matters

• The "Stop-Work" Order: A building inspector can legally halt your project and fine you.

  
  

• Demolition: In extreme cases, the municipality can obtain a court order to demolish unapproved structures at your expense.  

  
  

• Selling Your Property: When you sell, the buyer’s bank will often demand "as-built" plans. If your current layout doesn't match the council's records, the sale can fall through or you'll have to pay a "regularization" fee (which is much more expensive than the original plan fee).