As-Built Analysis
As-built analysis is the foundation of all retrospective delay analysis. Before any delay methodology can be applied — windows analysis, collapsed as-built, or as-planned versus as-built — the as-built record must be constructed from first principles using site records, correspondence, photographs, and contemporaneous data.
Record Collection
Deltime collects all available contemporaneous records: site diaries, daily allocation sheets, RFI logs, inspection records, delivery notes, progress photographs, correspondence, meeting minutes, and any programme updates issued during the project. The breadth of this dataset directly determines the robustness of the as-built.
Activity Reconstruction
Each activity in the as-built is populated with its actual start and finish date, derived from the best available record — not the programme. Where records conflict, Deltime applies a consistent hierarchy of evidence and notes all departures from the primary source in the report.
Logic Reconstruction
The as-built programme is logic-linked to reflect the actual sequence of work — not the planned sequence. Where activities were resequenced during construction, this is recorded and explained in the contemporaneous record where possible.
Delay Events Mapped
Each identified delay event is mapped onto the as-built programme at the point it occurred, showing the activities affected, the period of impact, and the causal link between the event and the delay to subsequent activities. This creates the evidential backbone for the delay analysis.
Delay Analysis Methods
Once the as-built is established, Deltime applies the appropriate analysis methodology: windows analysis, collapsed as-built (retrospective TIA), or as-planned versus as-built — depending on the contract, the records available, and the instructions received.
Expert-Ready Output
The as-built programme and all supporting analysis are prepared to a standard suitable for expert witness use — with a full audit trail from source record to conclusion, clear assumption logs, and a methodology note explaining every decision made in the analysis.
As-Built Programme Extract — Residential Tower, London
Comparison of planned versus as-built dates across key activities. Delay variance shown in calendar days (positive = late). Cause codes identify the dominant delay driver per activity.