• Personally I’d skip the middleman (I’m very much a do it yourself if you can person) and if expanding the footprint then use the existing footprint as a solid base for metpost brackets. You can then make a wooden base for a new structure floated a few inches above the existing pad. That it extends a bit outward is of no consequence. If you frame the floor out with 75mm tannelised post then it would be as rigid as a bishop in court.

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