Commercial project experience | Mechanical contractor support Sydney & Greater Sydney
As-Built Drawings – What It Is & When It’s Required
HVAC as-built drawings document the final installed mechanical systems and are essential for commissioning, compliance, and long-term asset management.
What it is
Reflects final installed HVAC systems
Updated after commissioning and balancing
Used for compliance, handover, and long-term asset management
Why it matters
Required for project handover and compliance documentation
Essential for future maintenance, fault finding, and upgrades
Reduces risk during defects liability periods
Prevents reliance on outdated or incorrect design drawings
Supports NCC, BCA, and consultant requirements
When it’s required
At mechanical commissioning and project handover
After design changes or site variations
Before practical completion (PC)
For compliance submissions and O&M manuals
Prior to future refurbishments or upgrades
ENGIC delivers commissioning-verified HVAC as-built drawings for commercial projects across Sydney.
Problem
As-built drawings often differ from design drawings.
Contractors change installations, but drawings don’t always get updated.
“Discrepancies cause delays, disputes and confusion at handover.
ENGIC Solution
Drawings updated using real site verification
Based on contractor markups & commissioning tests
Ready for O&M handover and future works
Developed alongside air and water balancing to ensure drawings reflect real, tested system performance.
What’s Included in Our HVAC As-Built Drawings Service
Site Review & Information Gathering
Review of design drawings and shop drawings
Site inspections to confirm installed services
coordination with commissioning results where applicable
Drafting & Verification
Accurate CAD as-built drawings (AutoCAD format)
Equipment, ductwork, pipework, and valve layouts
Systems updated to reflect site conditions
Cross-checked against installed equipment and valve locations
Final Issue & Handover
Final as-built drawing set issued
Suitable for O&M manuals and handover
Clear revision control and documentation
Your Deliverables – as-built mechanical drawings
Commissioning-Verified As-Built Drawings
ENGIC’s as-built drawings are developed alongside air and water balancing where applicable, ensuring drawings reflect tested and verified systems, not assumptions.
Verified during TAB activities
Reflect final valve positions and system configuration
Reduced discrepancies between drawings and real systems
See how ENGIC verifies HVAC as-built drawings on site during commissioning
On-site verification of HVAC as-built drawings during commissioning, confirming installed ductwork, pipework, valves, and system configuration align with final handover documentation.
