I get one single ding from my living room wall in the evening if the sun's been out. I'm assuming something metal is contracting after getting warm. Probably a wall tie or lintel.
I just accept it as a feature.
All houses, make their noises, mine certainly does, and they tell me the house is working perfectly normally. We used to get a drip, drip, drip noise, by the side of the front door. I traced that to heating pipes, which I boxed in, running down either side of the front door, expanding and contracting. That noise stopped when I fitted a new boiler and TRV's. I can just about hear the freezer compressor, when it runs in the utility room, but I often mistake it for a big diesel engine, ticking over on the nearby railway line, at the lights.

