We're building a bungalow for our retirement and want lo-maintenance, energy-efficient living with style. What is best interior wall construction for warmth and sound-proofing? What is best central heating option (using gas) and heating water. What are best uvpc doors and windows, soffits, bargeboards. How best to integrate a conservatory/sun room to the south-facing living room? Should we have a crawl-space for access to services/utilities. How best to mak use of roof space?