That cost is not too bad. As a comparison, EXP (extruded polystyrene), one of the standard under floor insulation products comes in at about 12BP ($20) for 25mm by 3m2 (4 x8') so you are coming in cheaper and with a better insulating product.
I ask about "out"sulation because there are a lot of masonry houses here and insulating on the inside takes away so much room and makes you do all the walls and trim. Outside messes up nice brickwork but siding is easier. Big dilemma for some.
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