Hi Roger,
I was writing about self building and not necessarily self designing. However, I understand and agree with your concern with respect to the increasing burden of regulation. Please excuse me for having a small rant here.
As you know, in the past it was easy to follow the regs and build using guidance set out in them. There were deemed to satisfy solutions to many requirements and, for example, tables showing acceptable timber joist, rafter etc sizes in the regs. Now you have to go to TRADA for structural timber size information or make calculations. The point of the various revisions to the regs was initially to allow alternative means of satisfying the requirements rather than being prescriptive. Later changes incorporate measures to meet the government’s commitment to improve energy usage in buildings.
Unfortunately the way they have implemented this, IMHO, makes it harder for everybody amateur and professional alike, particularly in Part L. Many architects now use professional energy advisors to make the calculations required to satisfy the Conservation of Fuel and Power regs. I think it's wrong that it seems so complex and believe a simple set of rules for DIY folks should run in parallel so that you could either do all the calcs or comply with a set of deemed to satisfy rules. End of rant!
I am in the construction industry so (to some degree) keep up to date with the regs. Getting planning permission and building regs approval is the first part of the job and should be completed before you start on site. By the time you start building you should be in possession of a set of drawings, specifications, supporting calculations where required and building regs approval for that design. One of the things that makes me mad about Grand Designs and the like is that so often they start on site before they have all the permissions in place. This leads to problems which entertain the viewer but reinforces a view that the building industry is generally incompetent. Sorry, slipped another mini rant in there.
If the self builder isn't up to or interested in tackling the regulation side then he/she should do what most people do and hire a professional to progress that set of tasks. Having tackled that hurdle I maintain that it is quite possible to build in your spare time. I completed the house I live in now before the major revisions to building regs were enacted but the actual building process has only changed in detail. Essentially more things have to be either done and certified by approved installers or checked by the building inspector. FENSA approved for doors and windows, Part P certified competent for electrics and so on. An aside, did you know that in Coventry you can do a Part P course and (if you pass the exam) be a competent person in 5 days for £850.
One alternative to employing a designer to cover the Building Regs is to purchase a timber frame erected and weatherproofed by the supplier. That way you could have them handle all the bits that relate to onerous regs and do the fitting out yourself. You don’t need to take my word for the viability of selfbuilding, a couple of weeks ago I went to the Homebuilding exhibition at the NEC packed full of potential selfbuilders and firms servicing their needs.
Finding a site is a problem but may be easier for BB if he is looking beyond UK. Apologies for the length of this post.
Graham