Cavity wall or not for garage/workshop?

[fex10]

We're building a 60 sq.m garage workshop for our projects (motorsports, car restoration etc). We've done a budget, excluding labour which we will do ourselves, it comes to less than £10k including a cavity wall.

The cavity wall adds approx £1500 to the cost. It takes away valuable space. It results in a wall without annoying piers. It does seem to be more engineeringly correct (stable, damp proof, warm).

In the future we may want to upgrade the building to something more than a garage (not sure what) so it may help with that.

Presently I'm disinclined because of the extra work and I don't think it's needed. Anything else to consider?

 

[tony1851]

Depending on your degree of exposure, single skin could well leak.

If you decide to alter it later, single-skin may hamper you by having to resort to alternative methods of construction which can be problematic (eg timber studwork with potential condensation issues),