if you are thinking of starting a 2nd career .. why not go all out an start a studio in a proper location?... or partner with someone (e.g. AJ23)... he is pretty good with portrait photography (evident from his many postings)...
I've seen your works from Safra studio course too... you should probably start soon before there are too many studios in the market...
If you are going to set up a studio in your flat, there may be some things you need to consider first.
1. The wiring of your power outlets and fuseboxes.
- The circuitry in some older flats are unable to cope with the high wattage required for studio strobes. You have to check or upgrade your outlets to prevent your power from shorting and becoming a fire hazard. Frequent power failure can also damage your equipment.
2.Overall Thermal Transfer Value (OTTV)
- Studio strobes generate a lot of heat (except HDI lights). You may have to hire a HDB contractor/checker to check that the heat from your equipment are within the OTTV for your flat. Your neighbours might complain if your equipments are emitting too much heat into their apartments. It's also a major cause of peeling paint.
- The ceiling maybe a bit too low in HDB flats, so you may be restricted in your lighting, especially if you have other attachments like barndoors or softboxes.
not having read the regulations (only heard of bits and pieces), and not having setup a home business in HDB myself...
i think one of the essential thing is that the neighbours are not disturbed in the process. like no operation of heavy machinery - can imagine the ruckus in a HDB flat!
there's a backpackers hostel that's setup right in a HDB shophouse (2nd storey) in woodlands. One of the criteria the owner had to meet was that whoever has to visit the business don't need to go through a common corridor to get to it.
eg. for the backpackers, it's not very nice if you have 10 or 20 backpackers walking in and out of the premises, and disturb the neighbours - how so? well, you never know what's your neighbours' threshold of tolerance. or say a clumsy backpacker manages to send a neighbour's potted plant crashing with a super-sized duffle bag...
the backpackers hostel's entrance is the back door of the shophouse, so there's no problems there.
for the studio, i guess one thing is whether people might become noisy and disturb the neighbours, whether if any heavy human trafficflow that may arise will disturb the neighbours, and so forth.
people have been having home studios in HDB flats so i don't think doing paid work in it is a problem in so far you meet the regulations and not disturb the neighbours in the process.