00VILLA GUIDE
Extending a villa: check the systems first
An extension adds rooms, but it also adds load to systems that were sized for the original villa: electrical supply, AC capacity, water pressure, drainage and the waterproofing where old meets new. Checking what the existing systems can take before the design is fixed saves expensive surprises when the new room is finished but too hot, too dim or too damp.
01PART
Electrical capacity
New rooms need lighting, sockets and usually AC. The villa’s board and supply may already be near their limit after years of additions. A survey shows whether a new circuit, a sub-board or a supply upgrade is needed.
- Photograph the board and note spare ways.
- List planned appliances and AC.
- Ask whether the supply can take the extra load.
02PART
Cooling and water
Extending an existing AC system to a new room rarely works well; a dedicated unit is often needed. New bathrooms or kitchens need water supply, hot water and drainage connections, and the booster pump must cope with the extra demand.
- Plan AC for the new space from the start.
- Check drainage routes for new wet areas.
- Confirm pump and pressure for extra outlets.
03PART
Where old meets new
The junction between the existing villa and the extension is a common source of cracks and leaks. Roof and wall waterproofing must be joined properly, and movement between old and new structures allowed for.
- Detail the roof junction carefully.
- Allow for movement at the joint.
- Check community approval requirements.
04QUESTIONS
- Can the existing AC cool the extension?
- Sometimes, but a dedicated unit is often more reliable.
- Will the board need upgrading?
- It depends on spare capacity and new loads.
- Why do extensions leak at the joint?
- Old and new parts move differently and the waterproofing must bridge them.