On Wed, 24 Sep 2003 10:22:35 GMT, a particular chimpanzee named
(Jake) randomly hit the keyboard and
produced:

Does anyone know what the bulding regs require re ceiling
sound-insulation measures when converting a house into two flats (one
up and one down)? I recall they recommended fixing plasterboard to the
ceiling of the lower flat - but how many layers and of what thickness
is effective?

It needs a lot more than plasterboard on its own. See
http://tinyurl.com/ohw8 for the Building Regulations requirements, and
http://www.british-gypsum.com/PDF/c60_053.pdf on ways to achieve them.

If you're converting, you will need a Building Regulations application
as it is a change of use. AFAIK it's also a COU under planning as
well.

There's other things to consider as well. You'll need to arrange for
testing of the sound insulation on completion. The means of escape
may be an issue, as will ventilation, insulation, etc.

This looks like a difficult job. Can anyone offer any tips on how to
do it single-handed with as few problems as possible?

Don't do it single handed if you're not sure of the requirements.
--
Hugo Nebula
"You know, I'd rather see this on TV,
Tones it down" - Laurie Anderson