Womersleys do a series of very useful and practical one day courses covering historic building refurbishment & eco-friendly new build. Womersleys specialise in traditional mortars, renders, plasters and eco paints but they also cover a broader range of eco-build issues.
Developing Skills put on a variety of self build courses in conjunction with Homebuilding & Renovating magazine and tutors include Mark Brinkley (builder and author of The Housebuilder's Bible) and David Snell (serial selfbuilder and author of Building Your Own Home).
The Centre for Alternative Technology runs a range of courses in sustainable building, usually 3 - 5 days but some are longer.
Woodenways do courses in log building
The Society for the Protection of Ancient Buildings do courses for home owners. There is a strong emphasis on using the correct techniques and materials during the course of repair of old buildings.