Hi there your conservatery needs to sit on a dpc of some sort two courses of blue brick would be good with plastic dpc to stop damp rising and also to make it able to have floor inside.

Put it on 3 courses of engineering bricks with dpc bedded on.

It really could do with being at least 2 or 3 bricks high with a DPC on the first course as the damp will rise through the brick.

It would be wise to sit it on at least 1 course of brickwork & a damp proof course between brickwork & conservatory. Also depends on height of DPC to house - ideally you would keep DPC's at the same height. Floor height to property & floor height to conservatory is another factor to consider.

1 layer of bricks and a DPC would be ok as the bricks will absorb water

Alternatively use engineering bricks

A minimum of 150mm is required above ground level for the d.p.c to be laid which works out at 2 rows of engineering bricks on a concrete foundation ground level may have to be excavated for a 100mm sub base under a1200g membrane followed be 50mm of a sharp sand finished floor

If you look at your property you will see two courses up or 150mm above external ground level you have a Dpc and the reason is that
a: to stop rising damp.
b:when it rains it bounces off the ground and in theory the hope is it wont bounce above this.

Two courses would be the better choice with a Dpm directly under your timber frame and if the wall is 100mm or 225mm then buy the same size Dpm.

Hope this helped.
Scott.

Would depend on the door frame dpc level of your propertyt and the floor level inside. I think you have to have a minimum of 150mm brickwork with dpc above external ground level and normally you try to keep the dpc the same hight as the existing building. You may find you have to lift the conservatory up higher than that so the floor levels work inside. It's not good practice to put timber straight on the ground even with a dpc underneath, it will rot fast.