Hi Charlie,
Thanks for your response. We're still pretty open in terms of the construction method we want to use. We'd looked at SIPs because we want a building that's going to be thermally efficient and quick to build as we're going to be moving into rented accommodation. The site we're looking at also has tricky access which is going to limit the size of the vehicle we can get in, so we may have to consider off loading to smaller vehicles to get stuff in, although some SIPs companies will supply smaller panels. I've looked at a number of companies who supply SIPs kit houses and with most of them you seem to be able to adapt the design, and you can choose what stage they take the build to - wind & water tight or turnkey. But given the tricky access timber frame may be a better option. I've looked at MBC but haven't looked at any other timber frame companies yet (we're going to be based in Hampshire near Romsey). Thanks for the information about the blockwork and warranty etc, I wasn't aware of that. I'd Goggled 'building plot contracts' and found some information about 'Conditional contracts' and 'Option contracts' so that's why I mentioned those. As a first time self builder it all seems quite over whelming at the moment, so I want to make sure I'm doing everything right.