1. It's not recommended to take the one size fit all developer package. Many have regretted as the quality is 13 months. Warranty is 12 mos.
2. One size fit all (single point of contact) with good quality - hire an ID firm - price also include project management fees.

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Because whilst a pilot may be very good at flying planes, if he is not well trained in ground operations, he can flip the baggage truck over within 10 mins.
Same goes to contractors.

Not to mention, there have been many idiotas (wannabe faux electricians) who mishandle wiring work (electrical).
3. To maximise your budget and how far it can go, appoint the right specialists for the right job will be less hassle.

General contractor
- Door relocation (to maximize built in wardrobe space)

Electrician
- Hacking can be done by gen con
- Power points installation
- Lights & ceiling fans installation (including placement of the lights & ceiling fans)
- Prepare site of new AC IDU point and IDU-ODU power connection.

Aircon installer
- Hacking for the new pipe run can also be done by gen con
- AC relocation & AC installation by AC installer. There is some trick to collecting up the existing gas in the pipes back into the AC unit and then need to vacuum out the pipe before extending to new spot.

Kitcab/wardrobe folks
- Built-in wardrobe

Shower screen folks (tempered glass)
- half wall half glass partition for my study room