Plee

Thanks all for your helpfull comments , i am too old for fast cars! So far GBS have been very helpful but as ragg987 says it is all in the fitting and GBS do not do their own fitting. I enquired of internorm and they said they did not do timber windows. I certainly could use rationel but at the moment they look considerably more expensive than GBS for very little gain in u value. all food for thought

I am new to the forum and building with an architect in the cotswolds a new home suitable for an elderly person. I am a retired farmer, yes some of us do retire, I had an offer too good to refuse. MBC are doing the timber frame, it was them who guided me to this site.. The planners say I must use timber windows and at the moment I am favouring Green Building Store. I have read most of the posts about windows but I see no mention of them. I know that they are less thermally efficient than Rationel who seem to be favoured by most on the forum but they are considerably less expensive. My calculations say that the difference in u value about 0.1 which is not going to have a life changing effect. What am I missing and has anybody any experience of using Green building store windows.