Construction scheduling / gannt chart creating

We are delivering a 150m² interior fit-out of a rooftop commercial extension in South London, a mixed-use space comprising a spa, events area, and treatment. Practical completion is targeted for 31 October 2026. We are looking for an experienced project planner or construction programme consultant to set up a working Gantt chart and advise on programme sequencing.

The works are structured in two phases: an enabling works package (currently underway, covering fire systems, drainage, demolition, and structural prep) followed by the main fit-out. We need the programme to reflect this phasing and give us a clear critical path through to completion.

What we need
Setup of a Gantt chart in Ganttify, Excel, or a comparable tool (advise us on best fit)
A short consultation call to walk through the task structure and sequencing logic
Tasks broken down across: enabling works, wet trades, M&E first fix, dry lining, finishes, FF&E, and commissioning
Key milestones marked: enabling works completion, main contractor mobilisation, fit-out start, snagging, and practical completion
Dependencies and lead times flagged where they affect the critical path
A format we can maintain and update ourselves going forward
We can provide the current scope of works, contractor packages, and indicative durations - we just need someone to turn these into a coherent, usable programme.

This is a one-off setup task, not ongoing programme management. We want something clean, practical, and handover-ready.