I would go with 30cm depth as it allows more flexibility. I understand what you are saying about paperbacks and wasted space to the front not being a great look, but in my mind it is better to have that space at the front than to have larger books projecting beyond the front of the shelves which is what you would have with 20cm deep shelves. If it is a working library then the number and size of books may change over time and the 30cm depth allows for maximum flexibility. On a side note the 78cm long shelves need to be strong enough to support all of the weight of those books. The string shelving you are looking at is usually presented fairly sparsely (as in your photos). Nothing worse than sagging shelves.... Best of luck, Dr Retro of Dr Retro House Calls

I would be asking questions from the person who said that they needed to be an extra 120mm wide. Do they actually know how wide a LED strip is? Or have they got confused with a fluro light? This is a 300mm narrow overhead cabinets with LED strip lighting concealed behind a pelmet over the central island bench. I also used the same LED lighting strip above the curtain pelmet shining upwards, and the wall mounted overhead cupboards. "Needs to increase depth to 420mm" translates to "I could not be bothered to do something that needs a bit of extra work and thinking to make my clients happy so I will try and change their minds". Happens all the time in the building industry with many old-school types not wanting to change the way they have been doing things for 100 years, so it is easier to distract the clients. Stick to your guns as good lighting is crucial to a well designed and functional kitchen. Best of luck, Dr Retro of Dr Retro House Calls and Dr Retro Virtual Visits.

I would talk to your pool builder about the pool detail. They are the experts.

all our spas with still water levels above shoulder height when sitting are the most comfortable to use for sitting and swimming and we found that allowing unsupervised kids to use our spas can be problem with damage and safety issues so water height should suit the sitting height of your adults