The seller revised the special condition in the sales and purchase contract. All they agree now is that before they hand over the house to us,
"the vendor shall at her own cost and expense and in a proper and workman like manner using a qualified tradesmen, arrange for three support beams in the roof to be replaced". So the second and third condition ( relocation of the aircon and engineering report to confirm that the roof structure is sound) were not accepted.
We are first home buyer and have no experience with fixing the roof or any renovation work. This is the second house we entered into a contract. The very first house we were interested in buying costed us a couple of thousands (deposit, lawyer fees, inspection reports). We pulled out the deal at the last minute because the building inspection report shows all the renovation work done by the owner were just cosmetic. We were in a way lucky as on the day of the inspection, it was raining heavily. The subfloor was full of pools of water. The downpipes were not properly connected to the storm water drainage and were blocked. Everything was just not right...... We have heard a lot of stories where the seller spent a few grands to renovate and cover defects before selling it at a much higher price than it is worth.
We learnt our lesson and it may sound pathetic, we are trying to be really carefull this time and not waste another few thousands hard earned money.
We was worried that the truss repair job for this house that we are going to buy would not be done properly. Firstly because the licensed builder is the agent's contact. Secondly I have no idea whether replacing the "beams" is the proper way to repair the truss". Thirdly the job only costs 1K and the seller does not agree to providing an engineering report. It would just be a quick and dirty job to get the deal through.
Thanks everyone for your time in replying. I've requested the real estate agent to provide the report they received from the licensed builder who will be doing the repair work and I will request the builder to provide pictures as evidence of work done.