When looking at a home, certain things should give off a warning to a home buyer.
The first photo is of the gap between the pathway and the house, showing the pathway has moved 100mm away from the house. This is probably due to poor site preparation on reactive soil or a retainer wall not adequately supporting the soil around the house. As this house has been built on a strip footing, this is a problem.
The second photo is taken from the roof looking at the rear verandah that has had some very DIY roofing added. The roof sheeting is obviously not adequately supported or attached and is dangerous.
The roof restoration was so poorly done, that tile edges were not painted, sealant gaps not filled and cracked tiles just painted over. I would assume that they were not adequately cleaned either, so the roof paint is likely to blister and peel.
Newly replaced timbers in the under floor area and roof space can represent termite damaged timber has been replaced or in this case, the DIY effort was to assist in replacing broken timbers. The roof collar tie was not level, so definitely  DIY, the original ones may have been broken by some one in the ceiling space placing a load on it. The flooring timber beam shown has been inadequately strutted directly to the ground. This is making a bridge for termite attack directly to the flooring, so definitely a DIY effort. The support is just resting on a brick off cut, so not actually supporting anything. This is nothing a tradesman would do.
This house door frame have had the door re hung, but the hinges are poorly fitted and the striker plate missing from another door frame.This is a minor issue, but shows the amount of care given to the home renovation to sell.
The next photo is of the driveway sinking 120mm down from the carport concrete floor level. A  car could not drive over this step up. The cause is the failure of a retaining wall and subsequent sinking of the soil due to poor sub soil preparation for reactive soil. The soil has also been affected by storm water flow due to miss alignment of the storm water down pipe, allowing for water to enter the sub floor area and wash out the ground under the drive way causing the sinking.
This same house has leaking bathroom issues with drumming floor tiling caused by the movement of the sub floor area flexing the bathroom floors. Also salt damp issues as shown in the photos as well as minor cracking to the brick work mortar and weathering and fretting of the mortar between the bricks due to poor mortar mixing by the brick layer.
I can not show too many identifiable photos for legal reasons as this home is still on the market and the vendor will find a buyer eventually, so buyer beware.