No to the grey - your wall seems to have a green tinge in them, so I would say either green/grey or a warm white tile with darker grout. If you choose the right grey/green, it is a classic look so shouldn't date. If you are a bit scared to choose colours, why don't you get a couple of warm white sample tiles and put where the splash back will go. You will soon see if it looks too stark....(maybe another idea, but possibly not a good one - why don't you see if you can put a few pages from a blank sketchbook in the whole area where the splash back will go (not super white white, but a warm white). That could also possibly highlight how stark (or not), the white may look. I can see what design tank is saying, as your cupboards appear to be more cream than white in the photos and if this is the case, then I agree the white will most likely look too stark. My cupboards in kitchen were white (but a warm white not a cool white). The stone bench tops also have the little speckles of stone in them..I can't remember the colour Ocean foam/Osprey.......but even with those colours and them not being cool whites, I thought the white tiles looked too stark against them. I therefore went for a glass splash back and ever since I then went to think of designs for my bathroom renovation, I constantly regret going with the glass in the kitchen and modernising the house too much..........definitely don't do glass if you are wanting to keep a classic charm to the house. In a long winded way, I think yes, I also think you should just stick with the grey/green. It will make a statement. Not the right shade...but another example....it may be hard getting the colour of the tile exactly right given that the walls are already painted and the tiles need to match.

Cost is not necessarily a big issue as some would expect. The cost's may not be that much different, many say it's more but forget to say by how much....... Some 'standard' but exceptional quality aluminium window and door systems are way more expensive than timber. Some other aluminium systems are quite poor in every aspect, apart from the glazing itself. Not really comparing apples with apples as the quality varies considerably and is quite complicated with so many manufacturers all offering various products at various thermal performance levels. Even some well known brands can be quite poor performing..... requiring double glazing where a comparably priced product but better quality only needs single..... Buyer beware! Window systems are becoming more of a priority during design than ever before. I'd shop around and get costings first rather than giving them boot just yet in particular if you really love them. Maintenance is really just painting (every 5 years?) or oiling the timber. Just keeping everything cleaned goes a long way to lowering the workload. Also being brick, that has reduced your workload again allowing some extra time to look after and admire the timber which you'll be looking at everyday when inside or out.

About your question about sourcing some of your own internal fittings. It is best you discuss this with the builder early on. Usually, the builder's contract will specify an allowance for particular fixtures. However, some may specify actual brand and model of fittings ie taps, toilets, sinks, etc in their quote, and they may or may not allow you to vary this. IF you are happy with those specified fixtures and you think the allowance amount is reasonable, then you can go with it. Otherwise, any changes or variances need to be discussed with builder, and it is very important this be discussed upfront and before any contract is signed. Some building contracts may also disallow some variances. In any event, carefully read the contract so you completely understand what you are agreeing to, and discuss any and all parts where you are not in agreement so these issues can be ironed out. Also, and this is my own experience and opinion, but I advise specifying in the contract the completion date AND if the build is not completed on time then what happens (consider that you may be paying interest on your mortgage, be financing a bridging mortgage, etc. and/or you may also have already sold your home and then have to pay rent until the build is finished). If you are in agreement with builder to source some of the internal fittings yourself, there are any number of suppliers and sources to investigate, and this might be a good way to keep your budget in check. There will be Houzzers who are experienced at this and can provide you with ideas. Just keep in mind that you will have to have all fittings READY and ON SITE when the tradesmen require them, otherwise you will be holding up the build and that is going to cost YOU money.

apologies for the poor quality pic..anyway hopefully u can see. My design features a cantilevered upper floor over the existing living/dining/kitchen using exposed engineered hyspan beams, it's hard to say but the new ceiling could be around 9 feet high, giving enhanced space downstairs. Upstairs there should be enough room for the master bed, study and additional lounge area (approx 8mx5m). Northfacing windows will provide ample sun in winter but shaded by the overhanging skillion roof in summer. A balcony overlooking the garden can be created using the cantilevered beams. Flooring can be particle board floor sheeting (again in keeping with the modest nature of the original worker's cottage). Southfacing windows will give expansive views of the lake and surrounds. Another feature I am proposing is a light well to light the downstairs, and connect the downstairs with the upstairs, so when you walk into the room, you see the fireplace, lookup and see the lightwell, look outside and see the views of the garden and lake. The exposed timber beams and high sheet ceiling will add interest to the downstairs as well. To complement, and soundproof the masterbedroom I am proposing a japanese style screen which can be pulled across for privacy and restrict noise from downstairs. The existing kitchen and bathroom can be demolished, and placed into a new wing, in the form of an old 'colonial' style (for want of a better descriptor) brick or sandstone extension (harking back to previous times). Complete with corrugated roof in the same colour as your existing roof. The extension will include a small walkin pantry, bath, shower, wc, and laundry utilities. All up these are modest extensions which I believe will enhance and encapsulate your existing workers cottage without costing a bomb. The chimney will be kept and will need extending either in brick, or steel flue up over the new roof. Steel might look nice.