Assuming that you are using a shell-only supplier and you are acting as the project manager, you will need to scope the ‘shell’ contract:
- what will be delivered
- what will be erected
- what will need to be done upon completion of the shell contract
- what provision is made for entry points of incoming services (gas, water, electric, etc.)
- whats the follow-on impact of installing the pipework and cables
- carcassing (especially waste and soil pipework which is large and hard to hide away after the event).
As a Project Manager, you need to anticipate the requirements of the follow-on trades. If you don’t know what the requirements are, you need to find out. It’s asking for trouble if you leave the shell supplier to second-guess their requirements. You will need to plan for:
- service ducts
- fireproofing issues
- sanitaryware fixing points
- stairway supports
- fixing grounds
You will be expected to communicate:
- service penetrations,
- finished floor to ceiling heights
As project manager, when you state you want a ceiling height of 2.45m, this needs to be understood by the superstructure contractor that this is a finished dimension, not a structural one — you may well need to run services beneath the first floor structure, or cater for the floor finish build-up. A floor of battens, plywood and high-end vinyl flooring in the bathroom might be 50mm thick, which unless you indicate otherwise, will reduce the 2.45m ceiling height to 2.4m unless you tell whoever is building the structure the full details of the build-ups. Make sure that person understands your requirements.
At the pre-start stage, the contractor can incorporate any desired changes as long as he knows about them in good time. Adding things in once the works have commenced is feasible, but remember, change costs money!
You must be at the centre of design coordination, ensuring the designer, structural engineer, services designer and interior designer are all working together with the client to ensure the designs have no conflicts, all the services fit in the correct places, ducts are correct etc.