Extension - timber frame?

Hi

Considering a 1.5 storey 2m x 6m extension to the side of an extended dormer bungalow.

Architect seems set on timber frame as it will meet the regs more easily in respect to insulation, i'd prefer block/brick personally especially as the extension will span the expansion gap / joint of the original extension (90's) and original building (1930's). Original building is brick and extension is brick/block. The space we will be building on is fairly limited admittedly, 2m is about as wide as we can go.

Is timber frame against a brick/block building OK or likely to move/crack with seasonal temperature changes etc? Clay soil too.

Thanks!

For a domestic extension it is very easy to comply with cavity walls, instruct your architect to do it as traditionally built masonry. And if you ever want to hang anything off the wall timber frame is a PITA and many prospective buyers will not be put off either.

Bloody architects!