The Building Services Research and Information Association provide specialist support services for design, construction, facilities management, product testing and market intelligence as well as publishing best practice guides. Their extensive library is a fantastic resource too! If you’re not already a member you really should join.
The British Standards Institute ensure that organisations make excellence a habit, all over the world.
The Building Research Establishment provide expert impartial research, knowledge and advice for the built environment sector and beyond. Also a font of information for BREEAM (BRE Environmental Assessment Method).
Chartered Institute of Building Service Engineers (of which we are, of course, members!).
The Planning Portal provides general information on everything from planning, building and fire regulations to how to find your local planning office.