What is the typical timeline for a ground or upper floor extension?

Understanding the timeframe for a home extension is essential for effective planning and setting realistic expectations. At Curtis Construction, we find that timelines can vary depending on whether you're building a ground floor extension or adding a second storey.

Ground floor extensions typically take between 10 to 14 weeks from the start of construction. This includes demolition (if necessary), site preparation, framing, roofing, and internal fit-out. If the extension includes kitchen or bathroom elements, these may add additional time due to plumbing, cabinetry, and finishing trades.

Upper floor extensions, being more complex and structurally involved, generally require 12 to 18 weeks to complete. This process involves reinforcing the existing ground floor to support the new level, followed by framing, roofing, electrical, plumbing, internal cladding, and final fit-out. Upper-level works also often require scaffolding and stricter safety compliance, which can affect timing.

Other factors that influence timelines include:

• Council approvals and permits

• Structural engineering and design delays

• Material lead times and availability

• Adverse weather conditions

• Site access limitations

• Changes to plans during construction

Curtis Construction uses a well-structured project management system that includes scheduling, communication, and coordination across all trades. While unforeseen delays can occur, we pride ourselves on proactive communication and keeping projects running efficiently.