I still don't understand the guarantee of 30 nests in a year apply here and if failed, do the contractor refund you the money or what?

If the contractor can assure me of these success in any place, I will now give him a contract to do a new BH now at a certain location and will even give him a bonus if the target attained during the agreed period or otherwise, penalties like forfeiting of 30% held as insurance against failure to attain the guaranteed amount.

Otherwise, what's good a guarantee "In Words only" and I can even boost to give any failed BH a hundred nests within a year for a good fee and some renovation done by me. Terms are that the owner must pay me for the renovation in advance and the consultation of Rm10K after the nests attained.  If failed, I already got my money for the renovation and if successful, the consultation fee will be a added bonus.. Either ways, I make my money and if failed, only my reputation is tarnished only.

Sincerely, I  like to give some suggestion cos your BH is good and should be better if you do ensure that you allow space for  the birds to breed and multiply. Looking from what you said, you are in good location and there were steady increment of nests in the BH and that's very good but beware of harvesting unused nests and you may slower the gains of your BH. Pls. remember that I just wanna help only and not criticizing here.

Congratulation, my friend

Ask your electrician to bypass a few wall sockets that are not connected to MCB at all, that way during rain will not trip because a lot of MCB very sensitive.

Connect your amps to that socket, and you can protect your amps by using those computer surge protector, so far I've been doing this for 2-3 years no amp got fried by lightning yet.