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Replacing part of dux quest pipes and replacing it currently available best pipe

Hi, I would like to replace part of plumbing which has dux quest pipes. most of the pipes are plumbed using buteline pipes and I believe, its 15mm diameter. I have been told by previous owner that dux quest is only present in downstairs bathroom. so I want to replace existing dux quest to current best pipes. Most pipes are easily accessible under house and I guess, total dux quest pipe should be around 5 to 7 meter but not 100% sure. So I am looking looking for quotes which includes material(which brand pipe and its warranty) and labour and other which includes just labour, I will get material myself. Please let me know if you have any questions.