Are the blocks filled with concrete? Are they laid on the concrete base or external footings? Can you post a pic bit easier to offer advice

Screed sand & cement to ensure a fall, Use plastic packers to keep battens from surface Coat underside of decking with paint (similar color), this will reduce cupping close to the ground.

Use a mortar mix (brickies sand and cement) to lay the pavers, allow 50mm min for the bed. Set up the first and last paver to required heights. Set up two string lines slightly wider than these and lay to the lines.

Depends more on the design of the structure, heat will build up with no ventilation.

Second Pic looks like you excavated below footings? If left for 3 months this could have caused the failure.

Short answer, No

The problem is more the level difference, the exterior has to be lower than interior, about 75mm

Your deck timbers may be treated but what you have done is breached any termite barrier for the existing house. levels are to high near existing wall, Recipe for disaster. A least have a physical gap at the wall so you can visually monitor.

Scotty, you just need an expansion joint between shell and slab

Hi, Questions: Paving/Tiling - we have had 2 landscapers and a paving guy out to look at the job (all told us different things). So we are not sure if we should be buying pavers and laying on a road base foundation, if so what thickness of pavers do we need? Or should we be concreting (how thick?) ...

Would build independently to house, will be trouble down the track for sure. Be also mindful of any termite protection breached

Didn't say you will need a surveyor, just in suburbia due to close proximity of boundary's we have to when carrying out any works which impact on others. If your not doing any works on the boundary maybe not needed, talk with your council

In regard to levels, we use either the old school optical (two man job), or a laser level. But we don't use them for making survey plans, only on the construction side. We use surveyors as most councils require that they are registered. Software side, download a free trial (fully functional 30 days)...

Have you entered correct load width? Just rechecked and passes software test for 'carport' beam with sheet roof

Need to get the footings certified for that purpose

Your initial out lay is certainly going to put a big dent in any saving you will make from a one off project. Autocad civil is a better choice for topography. Haven't used landcad plugin so cant comment. Perhaps, hire a level instead of buying? Not knowing your work background or skills, i would jus...

Try liquid chlorine mixed 10:1 with water, leave on for 5 min wash off (may need a little scrub')

Big thing to note on this is that paper tape must be used, not mesh Also back blocking of joints is also used to prevent cracks. Expansion joints only needed in very large ceilings 12 meters plus

290 x 45mm will be fine