We have slimline aluminium frames throughout our newly moved in house and I have admired their clean, modern look from the moment we had our first viewing. The rooms are flooded with light and the frames give a sharp aesthetic which lends itself to our mid-century look. Have lived with Upvc and wooden frames previously but the aluminum frames have gone to the top of my list.

Hi Kelly, I see that you have not had a reply to your question. So I would like to help, New bi-fold doors and sliding doors have an excellent thermal value. Doors can be made of multiple materials but the best in look, durability is alimininum, with aluminium and double glazed glass zed glass units you will be more than comfortable in the summer and the winter. If you are concerned about the heat coming into the room, for example, if you are south facing, we have a product called thermal glass. We use thermal glass on our roof lights; it is a treated glass that has a tint and reflects heat, the double glazed units stop heat from escaping. I have attached a few pictures of our skylight showing the thermal glass and an example of large skylights and large bifolds, honestly you will not be worried at all with large amounts glass these thermal values. We are more than able to assist you if you still require product advice. Thank you.

As a professional in the industry and also have a 360cm bifold door at home i know the issue all too well. It all comes down to the budget you want to spend. I would have to recommend use a curtain track so you can get good support all the way across the track and know that it is sturdy to hold a heavyish pair of curtains. You will have to go with a metal curtain track of some description as the plastic ones are just not substantial enough and will not work as smoothly as the aluminium ones. You will certainly be able to have a single curtain pull to one side with a good quality track. Now the main element of this is the heading style for these curtains. The modern wave headings give you a beautiful pleat that will always look beautiful. Any of our metal tracks would be substantial enough and some of them can be upgraded to 60mm or 80mm wave heading. https://www.direct-fabrics.co.uk/curtain-tracks/metal Price for a 350cm would be around £40 upwards for medium domestic. going upto a heavy duty around £150 even more for silent gliss products. Fitting and installation with a qualified CSCS fitter would be around £120 maybe more depending on location. However to note you will have curtains right infront of a beautiful bifold door that will obstruct light coming in through the windows. I would suggest shaping the track outside the reveal but the book cases are in the way. Perfect Fit Blinds An alternative if you want the light to continue to come in is perfect fit blinds these work as frames that go out side the rubber seals of the window and allow a secondary frame to be mounted without any drilling into the window. This means you can fit them quickly and easily. A pleated blind would look incredible. A further option would be electric curtain tracks that fold to the left or right. These would be around £1000 Best option for cost Other options a light unlined hotel weight dimout pair of curtains these would be 95% blackout and you wouldnt see through them, with an eyelet heading top fixed inside the reveal with recess brackets. would work well. Really simple you would have 32 eyelets on a 4 width pair. not quite 100% fullness but would still look very clean. This would take up approx 16cm per side. But would be stacked back beautifully https://www.direct-fabrics.co.uk/recess-curtain-pole-kit.html Hope this gives you some ideas. If you would like some samples let the team know www.direct-fabrics.co.uk

Glazing in general varies hugely in cost. You could get bifolds from as little as £2-3k all the way up to £20-30k. It really depends on what you want to pay for. The budget option is the double glazed uPVC. They are generally quite reliable. The very high end option would be the triple glazed, aluminium frame with "air" sliding. The quality is miles apart but do you really need to be able to open the door with one finger? Does your house have super energy efficiency credentials that will be affected by the budget option? Some are even hurricane tested if you're worried about that. I would recommend a mid range product but definitely with a warranty.