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Extensions and additions — General contractor — Professionals
Extension leads need a defined interface between the old and new buildings. Contractors should distinguish concept enquiries from priced drawings, establish the completion standard and identify investigation needed before accepting assumptions about groundworks or openings.
Service scope
Construction of additional building space connected to an existing property. The work combines the new structure with interfaces to existing foundations, walls, roof and services, with design and approval requirements determined for the actual project and jurisdiction.
What is normally included
- Construction of a designed extension
- Connections to the existing building
- Coordination of agreed internal completion
What is not included
- Assumed permission to extend
- Foundation or structural design based only on floor area
Qualification checks
- Confirm the proposed dimensions
- Review connection details
- Check design and consent stage
- Identify ground and service investigations
- Agree occupancy and weather-protection arrangements
Quote guidance
Separate groundworks, shell, connection work and fit-out. State allowances for unknown existing conditions and clearly list design, service diversions or finishes excluded from a headline extension price.
Lead risks
- Customers may compare shell prices with turnkey offers
- Unknown existing construction can change connection details
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